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Conference Proceedings

Extrusion and Spinning of Nylon-6,6 / Supercritical Carbon Dioxide Mixtures
Ziqiang Li, Costas Tzoganakis, May 2007

This work had two aspects. In the first one, the interaction between CO2 and nylon-6,6 melt is explored by investigating by the effects of CO2 on nylon-6,6 shear viscosity and hydrogen bonding. In the second one, an attempt is made to establish feasible conditions for spinning of nylon-6,6/CO2 mixtures, to produce nylon filaments. Extrusion and spinning experiments of nylon- 6,6 / CO2 were conducted on a twin- screw extruder line and the effects of carbon dioxide on viscosity and spun filaments morphology and tensile properties were investigated.

Comparison of N2 and CO2 in Extrusion Foaming of Wood-Fiber Composites
G. Guo, G.M. Rizvi, C.B. Park, May 2007

Producing cellular wood-fiber/plastic composite (WPC) with physical blowing agents (PBA) offers unique advantages over chemical blowing agents (CBA). This paper compares the foaming behaviors of two environmentally benign PBAs, namely N2 and CO2, to help understand PBA-based foaming mechanisms in WPC. This understanding will help in making proper choices about PBAs and foam processing parameters.

High Heat Ductile (HHD) Copolymers by Reactive Extrusion
Brian Mullen, May 2007

A blend of two polycarbonate copolymers, high-heat poly(ester-carbonate) (PEC) and polycarbonate-polydimethylsiloxane copolymer (PC-PDMS) provided an opaque, pearlescent blend. However, when a transesterification catalyst was used, the blend becomes miscible and translucent/transparent. The high-heat, ductile (HHD) materials were analyzed for a range of properties including optics, rheology, heat performance, flame retardance, and mechanical properties. The hydrolytic stability of the HHD materials was also measured by comparing the ductility of the blends before and after autoclaving.

Extrusion Foaming Behaviors of PET with CO2
Wenge Zheng, Patrick C. Lee, Chul B. Park, May 2007

This paper investigates the extrusion foaming behaviors of Polyethyleneterephthalate (PET) blown with supercritical CO2. The evolution of the foam's morphology once it exited from the die was recorded using a CCD camera and also characterized by SEM. Microcellular PET foams can be prepared by optimizing the PET properties as well as the processing conditions.

Phase Separation in Thermotropic Liquid Crystalline Polymer/Polycarbonate Blends under Shear
Kam-Wa D. Lee, Musa R. Kamal, Philip K. Chan, May 2007

The effect of shear on the temporal development of phase separation in thermotropic liquid crystalline polymer (LCP)/polycarbonate (PC) blends was examined. Experiments were performed using a polarized-light microscope, equipped with a shearing hot stage. Phase separation, with and without shear, in blends containing 50 wt % LCP were analyzed. The results showed that the speed and amount of phase separation increased when shear was applied.

Foaming Dynamics of Immiscible Polymer Blends
Zhihua Guo, Maxwell J. Wingert, Jiong Shen, L. James Lee, David L. Tomasko, May 2007

To better understand the underlying mechanisms of immiscible blend polystyrene/poly (methyl methacrylate) (PS/PMMA) foaming, a simple bilayer representation is examined. Visual observation of batch foaming of this system is conducted and a quenching method is used to study foams with different bubble growth time. These help understand the effects of blend morphology on foaming in a more quantitative way.

Rheology of Heterogeneous Polymer Melts
Charles L. Rohn, Eric Bennett, Fred Mazzeo, May 2007

Heterogeneous polymers represent an important class of plastics that comprise polymer blends, alloys, and fiber or mineral filled plastics. The rheology of these melts is dominated by the transient morphology that is produced during fabrication into finished products. Standard laboratory rheological tests do not take into account morphology. Combined measurements of a capillary viscometer and controlled stress rotational rheometer can provide a better understanding of the processing behavior of these complex rheological plastics

Injection-Molding Degradation of Biodegradable Polylactide
Richard Haibach, May 2007

The effects of degradation on the mechanical and aesthetic properties of injection-molded biodegradable polylactide (PLA) parts were studied. Standard tensile test specimens were molded from NatureWorks 3051D injection-molding grade PLA. Barrel residence time, machine nozzle temperature, and shear rate were varied during the injection-molding process. The resulting specimens were analyzed in a tensile testing machine. Tensile strength, tensile modulus and visual inspection were used to characterize the extent of degradation that occurred during each process.

Investigation of Failures in a Polypropylene Water Piping System
Donald E. Duvall, May 2007

Polypropylene pipe and fittings were selected for a high-purity, highly chlorinated water system in a medical research facility. In the first four years of operation, the system sustained an excessive number of leaks. This paper is an account of the investigation of the causes of those leaks.

High-Energy Electron Beam Processing of Wood Composites
W.L. Griffith, G.F. Dorsey, T.G. Rials, D.P. Harper, Nicole Labbé, T. Elder, May 2007

For high doses, a DMA analysis of wood and composites revealed a change in lignin resulting in reduced Tg, and that electron scavenging from lignin's aromatic structure could hinder the cure. An investigation of purified cellulose revealed changes at higher doses in the physical response to moisture and thermal stability without a change in the degree of crystallinity as measured by wide-angle X-ray scattering (WAXS).

Developments in Water Assisted Injection Molding Process Technology and Simulation
A. Polynkin, J.F.T. Pittman, J. Sienz, L. Mulvaney-Johnson, E.C. Brown, P.D. Coates, May 2007

A preliminary account is given of issues involved in numerical simulation of water assisted injection molding (WAIM), extending techniques used previously for gas assisted molding. An industrial scale, instrumented process is used to guide and validate the simulations. Novel sensor technologies, including ultrasound, are used at process to monitor the position of the water bubble during filling, together with melt pressures and temperatures as well as the residual wall thickness.

In-Mold-Fabric Decorated Parts with a Plastic Trimmed Edge
Mark A. Spalding, Brent A. Salamon, Mike E. Hus, Steven A. Sell, Curt E. Peterson, Jeffrey D. Wenzel, May 2007

Several processes currently exist that produce a thin-walled part with a fabric-covered surface. These processes, however, are limited by cost, low production volumes, and durability of the part. A new process is described here that produces a high-quality and durable, thin-walled part using low-cost mass production techniques.

Effect of Additives on the Color & Appearance of Plastics
Bruce M. Mulholland, May 2007

The color and appearance of a formulation must be engineered just like any other desired thermal or mechanical property of the resin itself. The ability to achieve the desired color can be adversely affected by processing or the combination with modifiers and additives in the resin system. Even if colors can be achieved, other performance attributes such as UV stability, flammability or mechanical properties may be adversely affected as well. This paper looks at some of these color concerns.

Effects of Molecular Weight Distribution on the Formation of Fibers of Electrospun Polystyrene
Xiaoshu Dai, May 2007

It is widely recognized that molecular weight distribution (MWD) is an important factor affecting the rheological behavior of polymer solutions. In this contribution, the effects of MWD on the formation of electrospun polystyrene fibers in THF have been studied. The results are compared with the monodisperse system. The importance of chain entanglements attributed to high molecular weight component within the polydisperse system has been acknowledged. Concentrations for the incipient as well as stable fiber formation in a polydisperse system may be predicted.

Reinforcing Virgin, Reprocessed or Recycled Polypropylene with Agave Fiber and a Polymeric Coupling Agent
Carlos F. Jasso-Gastinel, Reyes J. Sanjuan-Raygoza, May 2007

The capability of using residual agave fibers from the tequila production process, to reinforce virgin, reprocessed or recycled polypropylene, is studied. Polypropylene composites were prepared with milled (65 mesh) agave fibers and Epolene E-43 in a twin screw extruder, varying the amount of fiber. Tensile, impact and dynamic tests, along with scanning electron microscopy observations were carried out. The importance of polymer-fiber interaction through the presence of the coupling agent is clearly shown.

Evaluation of the Melting Capacity of Three Single Screws
Eldridge M. Mount III, May 2007

The instantaneous melting rate of single screw extruders are primarily affected by the screw speed, barrel temperature and screw diameter. However, with all things being equal the overall melting capacity of the screw is controlled by the solids bed-barrel contact area. Three screws, a conventional, a barrier and a barrier-XLK design with variable melting areas are evaluated for overall melting capacity as defined by their specific output.

The Interactions between TIO2 Surface and Polymer Additives
R.B. Maynard, P.M. Niedenzu, May 2007

A common pigment used in many plastics application is titanium dioxide, TiO2. The pigment is a very effective light scattering inorganic oxide for the coloration and protection of plastic articles. TiO2 is also an insoluble material within a polymer matrix that has the ability to adsorb other materials within the matrix. Additionally, a TiO2 particle can catalyze the formation of chromophores from additive deactivation. This aper describes the adsorption behavior of several TiO2 materials compares the rate of chromophore formation in a polyethylene matrix compounded.

Synthesis and Characterization of a Cationic Monomer with ATRP Initiation Sites
Kory Slye, May 2007

The current coronary artery stent coating, styrene-bisobutylene- b-styrene copolymer, [1] has been researched and several problems arise when this coating is used. A alternative coating needs to be developed with several polymers forming from the main chain of the polymer. Several different bromination techniques have been researched to achieve the desired polymer to create the drug eluting coronary artery stent. This paper will describe the methods used.

Field Failure Analysis: Pinhole Mode of Failure of Polyolefin Pipes
A. Caratus, Z. Zhou, A. Masud, A.Chudnovsky, May 2007

Pinhole mode of polyolefin pipe failure in water distribution systems is commonly assumed to result from a sharp object impingement and attributed to inadequate installation practice. The cases of this mode of failure are investigated by direct observations of field failure combined with review of installation, service condition and stress analysis of the problem in question.

Additives for Improving Processing and Properties of Polylactic Acid
Zuzanna Cygan, Mohit Singh, Sri Seshadri, May 2007

Polylactic acid (PLA) is a bioresin that is rapidly expanding into a variety of applications requiring a range of processing techniques including extrusion, calendaring, blow molding, and thermoforming. However, the low melt strength and brittle nature of the polymer provide challenges in processing and in the final product performance. We have demonstrated that the use of additives can improve processibility, melt strength and impact strength of PLA. The effect of additive type and loading levels on PLA resin properties and clarity will be presented.







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