SPE Library
The SPE Library contains thousands of papers, presentations, journal briefs and recorded webinars from the best minds in the Plastics Industry. Spanning almost two decades, this collection of published research and development work in polymer science and plastics technology is a wealth of knowledge and information for anyone involved in plastics.
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Conference Proceedings
Surface Treatment of Polymers and Composites with UV Light in Air to Improve Adhesion
Alekh S. Bhurke, Lawrence T. Drzal, May 2004
Ultraviolet (UV) surface treatment of polymers in air has been used to successfully modify polymer surfaces in order to enhance adhesive performance and wettability in a cost efficient manner. A wide variety of polymers including thermoplastics (TPO, PP, PC, PMMA), thermosets (Epoxy, Vinyl Ester), rubbers and composites have been successfully modified with this UV treatment. Improvements in adhesive bond strengths from 100-600% can be realized for hydrophobic polymers such as TPO and PP with treatment times on the order of 30-120 seconds. Several key process parameters for UV treatment have been identified. UV radiation in the 180nm-300nm was found to be necessary for surface modification of polymers. The extent of surface modification was found to be strongly dependent on the ozone concentration. The surface temperature during treatment was also found to be a controlling factor for some polymers and preliminary evidence points to a relationship between the optimum treatment temperature and the glass transition temperature (Tg) of the polymer substrate.
Development of Methods for Assessing the Chemical Compatibility of Thread Sealants Used with Plastic Fittings
J.R. Paschal, J. Bian, May 2004
Thread sealants have been used to help ensure a leak-tight joint and reduce friction during installation between threaded metal pipe and fittings for over 100 years. Thermoplastic fittings using the same taper thread cannot be assembled as if they were metal due to chemical compatibility and maximum material stress. However these same sealants are often used on a plastic fitting joint. This may be done either because the installer has been trained to use the same sealants on all threaded joints, or because the plastic parts are not fitted properly and are leaking under pressure. Unfortunately, sealants that work well and are compatible with metal pipe threads may contain stress-cracking agents that will cause failure in plastic fitting joints. Because it is unlikely that the industry practice of using thread sealants will change in the foreseeable future, a method is needed to evaluate these products to determine compatibility with existing fittings materials and designs. The current work develops three categories of testing using tensile, flexural, and threaded part configurations. Several variations in each of these methods are attempted, with multiple types of sealants and materials. There is a definite trade-off in test duration and complexity of the test method. The results of this testing program are provided, with analysis of the failure types and recommendations for the development of an ASTM test method.
Mechanical Properties of Rotationally Moulded Nanocomposites
P.R.W. Hanna, T. McNally, E. Harknin-Jones, P. McMillian, May 2004
Polyethylene montmorillonite and quaternary tallow ammonium chloride modified montmorillonite nanocomposites were prepared by melt blending. The effect of compatibiliser concentration on composite mechanical properties was investigated. The nanocomposite morphology was examined using wide angle X-ray diffraction and scanning electron microscopy. Primarily intercalated structures were observed. The nanocomposites prepared were rotationally moulded using a peak internal air temperature of 200°C and an oven temperature of 300°C and injection moulded samples using a nozzle melt temperature of 220°C. No significant variation was evident in the shrinkage and warpage characteristics of the rotomoulded parts. The tensile, flexural and impact properties of specimens taken from both the rotomoulded and injection moulded parts varied with compatibiliser content. Generally, the properties of the injection-moulded parts were superior to that of the rotomoulded parts.
Polyethylene Nanocomposites – Investigating the Tensile Properties of Polyethylene Nanocomposites for Rotational Moulding
Michael Murphy, R. Truss, P. Halley, D. Martin, C.L. Ang, May 2004
Rotational moulding is continuously expanding into new markets which require improved material properties and shorter cycle times. Conventional PE, used in over 80% of the rotational moulding market is a relatively low strength material therefore high part wall thickness, long cycle times and design limitations are imposed.The development of polymer/clay nanocomposites has shown significant improvements in mechanical properties with small additions of organoclay, which have the ability to improve mechanical performances or reduce cycle times.In this work the effect of organoclay on the tensile properties of PE nanocomposites at a range of temperatures was investigated. Tests were also conducted at a range of cross head speeds (CHS) to illustrate the effect of slow rates of extension and instantaneous loading. Tensile testing shows the final nanocomposite properties depend significantly on organoclay loading with improvements of 25% in tensile modulus at room temperature and larger improvements at higher test temperatures being reported. The results also indicate the organoclay loadings investigated had an adverse effect on the tensile yield stress.
Investigation of the Processing Characteristics and Mechanical Properties of Metallocene Catalysed Polyethylene Foams for Rotational Moulding
E. Archer, E. Harkin-Jones, M.P. Kearns, A.M. Fatnes, May 2004
The object of this work is to investigate the foaming characteristics of three grades of metallocene-catalysed Linear Low Density polyethylenes for rotational moulding using both an exothermic and endothermic chemical blowing agent. This paper reports on the results of ongoing experimental investigations in which rheological and thermal parameters are related to the polymer structure and mechanical properties. Through adjustments to moulding conditions, the significant processing and physical material parameters, which optimise metallocene catalysed linear low-density polyethylene foam structure, have been identified. The results obtained from equivalent conventional grades of Ziegler-Natta-catalysed linear low-density polyethylene are used as a basis for comparison.
The Effect of Coupling Agents on Foaming with Polymer Microspheres in Rotational Molding
D. D’Agostino, E. Takács, J. Vlachopoulos, May 2004
The use of polymer microspheres for producing microcellular foams is a new development in rotational molding. In previous studies, some reduction in mechanical properties has been found due to the immiscibility between the polymer shell and the matrix polymer. Coupling agents can act as a molecular bridge at this interface and can also affect bubble growth by altering the rheological properties of the matrix polymer. The influence of different coupling agents on the melt properties of several resins was investigated, as well as the effect of these coupling agents on the mechanical properties of foamed rotationally molded parts.
Manufacturability of Fine-Celled Cellular Structures in Rotational Foam Molding
Remon Pop-Iliev, Donglai Xu, Chul B. Park, May 2004
Any closed-cell polyolefin foam production tends to achieve the highest possible cell size distribution uniformity, cell size reduction, and cell density augmentation. However, the control of the cell size of rotationally foam molded cellular structures formed on the base of a chemical blowing agent (CBA) might be often aggravated by some inherent limitations that are unique to the rotational molding process, which results in coarsercelled final cellular structures being yield. Although a finecelled morphology (cell size < 100 [?m] and cell density > 106 [cells/cm3]) in rotationally molded foams has been closely approached, it has not been actually achieved yet, nor it has been ever clarified whether it is actually achievable in rotational foam molding or not. This study attempts to provide an answer to this fundamental question by focusing on the understanding of the mechanisms governing the formation, growth, shrinkage, and collapse of CBA-blown bubbles in non-pressurized polymer melts originating from extrusion melt compounded foamable resins in a pellet form.
Oil Heating and Cooling Machines for the Rotational Moulding of Plastics
Michael J. Wright, Roy Crawford, May 2004
Forced air convection is the most common method for heating and cooling the mould in the rotational moulding process. However, it is generally accepted that this is a very inefficient method of heat transfer and so interest has grown in the use of more direct methods of heating and cooling the mould. This paper reports on an experimental study where oil was used to heat and cool the mould. This method is used commercially in a small sector of the market, but there has never been a detailed study of its effectiveness. The results to be presented in this paper show that oil heating and cooling of the mould offers much higher thermal efficiency and reduced cycle times. The performance of the oil heated machine is compared directly with a conventional hot air oven. It is shown that ovenless rotomoulding machines are more amenable to process control because monitoring equipment on the mould is easily positioned outside the heated environment.
The Effect of Direct Electrical Heating on the Cycle Time and Mechanical Properties of Rotationally Molded Polyethylene Parts
C. Daly, M.P. Kearns, R.J. Crawford, May 2004
Direct electrically heated oven-less rotational moulding machines have been introduced to the rotational moulding market over the past few years. Whereas some of these systems used composite mould technologies, the MECH™ system developed by PPA Teo of Ireland, employs conventional steel tools heated directly by electrical elements surrounding the mould. The elements are supplied with current though slip rings. This paper will present the results of an initial study into the moulding and cycle time characteristics of the MECH™ system and compares it with two types of conventional hot air rotomoulding machines. Machine efficiencies, as well as heating and cooling times have been compared for the three machines. The effects of processing parameters on the mechanical properties of the mouldings have also been assessed.
The Effect of Cooling Rate on Rotationally Molded Parts
G.W.G. McDowell, M.C. Cramez, E.M.A. Harkin-Jones, W. McMinn, R.J. Crawford, May 2004
The quality of a rotationally molded part is highly dependent on its cooling rate, perhaps more so than its heating rate. A trade off between part quality and cycle times is often necessary to ensure economical feasibility. This paper presents an overview of the effect of cooling rate on final part quality. The temperature profile through the part wall during cooling is related to the part’s mechanical properties, morphology, shape and general appearance. Six different mold cooling rates are investigated; they range from quiescent cooling (average 2C°/min) to water spray cooling (average 15C°/min).
The Effect of Thermal Relaxations on the Crack Initiation Resistance of Rotomolded Linear Low Density Polyethylenes
L.T. Pick, E. Harkin-Jones, May 2004
The objective of this paper is to provide a better understanding of how test temperature and test frequency affect the crack initiation and propagation energies of rotomoulded materials. Trials were carried out on a range of rotomolded linear low density polyethylenes. Instrumented impact tests and dynamic mechanical thermal analysis (DMTA) were carried out on each material at a wide range of temperatures and frequencies. It was found that there is a linear relationship between the crack initiation energy of the samples and the tan ? values at all test conditions. By using this relationship it is possible to predict the crack initiation energy of a polymer part over a wide range of conditions by carrying out a small number of tests.
Rotational Molding Process Control
Alvin Spence, Rob Scott, May 2004
Process control for the rotational molding industry has been continually evolving in recent years. Initially, impact strength, and bubble content in the wall of the molded parts, were used to gauge the level of cure and also to control the process. More recently, the development of the Rotolog process control device has provided a more scientific means to ensuring good process control.This paper highlights some recent work that expands upon the methods previously mentioned, applying new methodology to measure and control the process. The effects of various processing conditions are considered, in particular, with respect to the cooling cycle, and how they relate to process variation. The results outlined provide new processing knowledge that can be used to further develop the control of the rotational molding process.
Performance of a Rotationally Molded Thermotropic Liquid Crystalline Polymer
Eric Scribben, Donald Baird, May 2004
Thermotropic liquid crystalline polymers (TLCPs) have a number of potentially useful physical properties for rotational molding: excellent chemical resistance, good barrier properties, low coefficient of thermal expansion, high tensile strength and modulus, and good impact resistance. However, it is possible that the nature of the molding process is such that full advantage of these properties cannot be obtained. To determine how well TLCPs perform when rotationally molded a commercially available TLCP, Vectra B 950, was studied under static conditions as well as with a single axis rotational molding unit capable of measuring the internal air temperature. The processing temperature was determined by measuring shear viscosity at several temperatures. The tensile strength and modulus of both statically molded and rotationally molded samples were measured. Samples were evaluated for complete densification by inspecting the fractured surface.
Metallocene Based Polyolefins for Rotational Molding Applications
Eric Maziers, May 2004
Polyolefins based on metallocene catalyst technology appeared in the early 90’. These polyolefins were first used in application like blown film for metallocene polyethylenes, cast film and fibers for metallocene polypropylenes.This paper will highlight the interest of metallocene based polyolefins, polyethylene and polypropylene resins, for rotational molding applications. Polymer characteristics, processing behavior and rotomolded item properties will be compared to conventional Ziegler-Natta based resins. These new polyolefins show a real potential in terms of cylce time, dimensional properties, impact and optical properties improvements.
Effects of Particle Morphology on the Processability of Ethylene Copolymers for Rotational Molding Applications
W. Lin, C.T. Bellehumeur, M. Weber, May 2004
Polymer sintering plays a major role in processes such as rotational molding, governing the heating cycle and the properties of the final parts. This work aims at determining the impact of changes in the material formulation and processing history on the sintering behavior. These changes are known to introduce variations in the material morphology and thus affect the material processability and properties of the end-product. Variations in the thermal treatment were found to have an effect on the particle morphology but a limited impact on the sintering process. It was also found that the addition of a nucleating agent can be detrimental to the sintering process. The impact of these changes, however, seems to be related to the viscosity of the material as well as the molecular structure.
Plasma Modified Polyolefin Powders for Rotational Molding
D. Erich Boersch, Peter Knoth, Axel Pfitzmann, May 2004
Reliable sources estimate that about 75% of molded polyolefin technical parts need surface refinement. Those surfaces have to be lacquered, dyed, glued, coated, or printed. Also, polyolefin resins offering better adhesion to PU foams are requested.The ARPLAS process offers improvements in quality, economics, and flexibility. This plasma process modifies the chemical structure of the polyolefin powder surface, that non-polar, hydrophobic materials become polar, hydrophilic materials, which can be lacquered, coated, and foamed without any other additives.The modification of the powder is achieved by implantation of functional groups into the polyolefin molecules. Characteristics of the material, i.e. impact strength, ESCR, and other major specifications remain unchanged as well as processing compared to non-modified PE.The new ARPLAS technology offers molders new application possibilities, opens up new market sectors, and reduces adhesion problems.If serious sticking/adhesive problems are to be solved, the use of ARPLAS-treated powders make sense. This is also true if an acceptable paint coating is to be applied or a strong bond is to be made with PU foam.
Electrical Conductivity of Composite Nanofibers of Polypropylene/Carbon Nanofiber and Nanotubes
Abhishek Guha, R. Byron Pipes, May 2004
The DC electrical conductivity of composite microfibers consisting of carbon nanofiber and carbon nanotube reinforced polypropylene is examined. Carbon nanofibers with an average diameter of 100 nm can serve as ideal precursor system to carbon nanotubes for the development of polymeric fibers with superior electrical, mechanical and thermal properties. Electrical conductivity of the microfibers was measured over a range in the nanofiber weight fraction of 0.5-10 percent and carbon nanotube fraction of 0.1 to 0.5 percent. The results provide a comparison between the property enhancement levels achieved in the microfiber by the addition of similar weight fractions of carbon nanofiber and carbon nanotube reinforcements in the dilute range.
Low Shear In-Mould Decoration-Processes for the Manufacture of Three-Dimensional Molded Interconnect Devices (3D-MID)
Roland Dörfler, Gottfried W. Ehrenstein, May 2004
The aim of Molded Interconnect Devices is to integrate in an injection moulded part with structured plated surfaces electrical and mechanical functions. One of the promising manufacturing methods of 3D-MIDs is the In- Mould Decoration-Process, which uses a plastic-film with a circuit-pattern plated on its surface. Problems which occur sometimes in the conventional In-Mould-Decoration- Process are the damage of the circuit structure or the plastic- film due to high shear stress and pressure during injection. Another problem could be the warpage of the device. Different process-variants which are capable to overcome this difficulty like thermoplastic foam moulding and injection compression moulding were evaluated. Of major concern in the investigation was beside the warpage the adhesion between the plastic-film and the substrate depending on different process-variants of In-Mould Decoration.
Control of Directional Electrical Conductivities in Carbon Black-Thermoplastic Exrtrusions Produced by Chaotic Advection
V.A. Chougule, D.A. Zumbrunnen, May 2004
Whereas prior related work involved batch devices, an industrially relevant continuous flow chaotic mixing process has been used in this study to form structured distributions of carbon black in extruded films. Methods were also applicable to other extrusion profiles. Carbon black masterbatch was formed into numerous filamentary striations that yielded conducting states at low overall compositions. A range of electrical properties were selectable via process parameter specification. Differences in directional conductivities along the width and length of the film were controllably obtained. The progressive formation of structure was related to electrical properties and process conditions.
Nondestructive Characterization of Orientation in Thick Cast and Drawn Polyaniline Films
Runqing Ou, Robert J. Samuels, May 2004
Polyaniline (PANI) films 20 to 50 microns thick cast from N, N’-dimethylpropylene urea (DMPU) solution and stretched to different draw ratios were examined. The thickness of these visibly opaque PANI films posed severe limitations on available structural characterization tools. NIR wave guide coupling, X-ray diffraction and FTIR infrared dichroism methods were used. Two new infrared transition moment angles for weakly absorbing bands were determined for the PANI molecule. This allowed the Hermans’ orientation function for the thick PANI films to be determined nondestructively.
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