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
Viscoelastic Properties of Nylon 12 and PVDF
N.L.A. McFerran, C.G. Armstrong, T. McNally, G.M. McNally, W.R. Murphy, May 2002
We report the time and temperature dependant properties of Nylon 12 and PVDF characterized using linear viscoelastic theory based on the Boltzmann superposition principle. Dynamic mechanical properties of both polymers were scanned isothermally at intervals of 10°C between 30 to 140°C for five different frequencies, 0.3, 1, 3, 10 and 30 Hertz. Stress relaxation measurements were made using a Zwick tensile test machine between 25°C and 140°C at 10°C intervals using a crosshead speed of 50 mm/min to a maximum strain of 2%. The DMTA and stress relaxation data were compared by converting temperature dependence at constant frequency, into a time dependence at constant temperature. The increase in temperature was converted to a corresponding increase in time using log aT (shift factor) data superposed at 30°C. Good agreement was obtained between the stress relaxation modulus E (t) calculated from the dynamic modulus E`(?) and from that measured experimentally. These results will be used for the prediction of the thermoforming characterisation of multi-layer tubing.
Viscosity Characterization of Bulk Molding Compounds
Brett W. Weber, May 2002
Viscosity variations in bulk molding compounds have long been a concern. The reactive nature of the polymer, response to thickening agents, high filler and glass loading, all contribute to this variance. Additionally, environmental factors such as storage temperatures and humidity affect the viscosity of these compounds.Confounding the issue is the often forgotten about gage variation. There have been many test methods developed in an attempt to characterize the viscosity of bulk molding compounds. Most of these contribute, as much, if not more to the total variance.This study examines viscosity characterization methods for bulk molding compounds
Viscosity Measurements on Polypropylene Mixed with Supercritical Fluid at High Shear Rates
Hung-Yu Lan, Hsieng-Cheng Tseng, May 2002
Viscosity of polymer melts can be effectively reduced by adding constituent of supercritical fluid (SCF) during plastic processing. The viscosity reduction depends on the amount of SCF added and also the magnitude of shear rate. This research modified a conventional injection-molding machine to investigate the rheological behavior of PP/SCF mixture. By measuring the pressure and flow rate of the melt at a slit die which was attached in front of the nozzle, the true viscosity can be obtained after making Bagley and Rabinowitsch corrections. By using this machinery, the shear rate can be achieved as high as order of 1E4 1/s .
A Visual Approach to Better Failure Analysis
Mark Galley, May 2002
Much has been written outside of the technical fields on how to communicate more effectively in groups. The concepts on visually mapping information are directly applicable to conducting a more thorough failure analysis. This is especially true for issues involving cross-functional teams with multiple parties. Studies have concluded that people can process significantly more information visually than they can verbally. A picture is truly worth a thousand words. Cause Mapping is a systems-thinking" approach to visually analyzing documenting communicating and solving complex problems. This presentation will demonstrate an effective approach to failure analysis using a common tool like Microsoft Excel."
Visualisation and Analysis of LDPE Melt Flows in a Coextrusion Geometry
M.T. Martyn, T. Gough, R. Spares, P.D. Coates, M. Zatloukal, May 2002
Experiments were performed to enhance our understanding of the interfacial instability phenomena of polyolefin melt flows within a slit coextrusion die. The die configuration allowed a single polymer melt to be used, by using a modular flow cell consisting of a flow splitter, convergent section and die land. The whole of the confluent region and die land are visible through side windows. A further window perpendicular to the flow enables the use of laser sheet lighting for particle imaging techniques. Stress fields in the confluent region and the die land are determined by analysis of birefringence. The die design and experimental techniques allow exploration of the effects of geometry and processing parameters on the source and nature of flow instabilities. Two low density polyethylene melts were studied. Interface instability is observed in the die land for one of the polyethylenes and this results in a 'wave' type distortion of the extrudate. The instability occurs at specific layer thickness ratios.
Visualization of Drop Breakup in Polymer-Polymer Systems
B. Lin, U. Sundararaj, F. Mighri, M.A. Huneault, May 2002
This work studies the deformation and breakup of a single viscoelastic polymer drop inside a viscoelastic polymer matrix using a specially designed transparent Couette apparatus with well-controlled shearing and temperature conditions. Drop deformation and breakup mechanisms were observed through two video camera systems. Polyethylene/polycarbonate (PE/PC) systems over a wide range of viscosity ratios were studied. Two main breakup modes were observed: 1) erosion from the surface of the drop in the form of thin ribbons and streams of droplets and 2) drop elongation and drop breakup along the axis perpendicular to the velocity direction. This is the first time drop breakup mechanism 1) has been visualized in polymer systems.
The Water Injection Technique (WIT) as an Attractive Alternative and Supplement to Gas-Assisted Injection Molding (GAIM)
Tim Jüntgen, Walter Michaeli, May 2002
The water injection technique (WIT), developed at the Institute of Plastics Processing (IKV), Aachen, Germany, is an innovative specialty injection molding process that is closely related to the well-known gas-assisted injection molding (GAIM). The primary aim of the development was to reduce cooling times in the material-saving production of hollow plastics articles by means of using water as a process medium for melt displacement. Besides other advantages, especially the considerably more efficient cooling effect of water meant that cooling times could be reduced by up to 70 % compared with GAIM. Investigations on a wide range of unfilled and filled materials show that WIT constitutes an attractive alternative and supplement to GAIM.
Water Processing Using Polyamide Membrane
Kal. Renganathan Sharma, May 2002
Desalination by reverse osmosis and by ion exchange technologies are compared with each other. Now polyamide membrane made from all trans stereoisoner of cyclopentanetetracarboxylic acid chloride by interfacial reaction of m-phenylenediamine, trimeosyl acid chloride A copolymer blend design may be used to prepare a thin film membrane. Turbulent flow keeps the concentration polarization layer thickness low. Composite ion exchange resin is prepared with poly styrene copolymer matrix crosslinked with divinylbenzene with macro reticular structure and weakly basic resins. The macropores in the matrix is filled with acrylic acid copolymer crosslinked with divinyl benzene and weakly acidic groups.
β-Crystalline Polypropylene (Bepol™) and Oriented Film Applications
Sehyun Kim, Edwin B. Townsend IV, May 2002
Polypropylene with high ?-crystalline content is obtained by employing a ?-nucleator, such as ?-quinacridone, N,N’-dicyclohexyl-2,6-naphthalene dicaboxamide or a combination of a Group II metal salt or hydroxide and an organic di-acid compound. In this case, Bepol™, a ?-crystalline polypropylene, contains a small amount of a Group II metal salt or hydroxide and an organic di-acid compound. In this study, various products of Beopl™ have been characterized and applied to oriented film.
"Born" Exporting in the Mould Cluster of Marinha Grande
Leonor Sopas, May 2002
Empirical evidence on the start-up of two plastic moulds exporters located in Marinha Grande, Portugal, illustrates the process through which location within a cluster contribute to explain how start-ups manage to be born" exporters.Relations within a cluster tend to be frequent and long lasting encouraging information flows and trust. These play an important role in detecting opportunities and in accessing resources. Furthermore outward oriented clusters attract foreign buyers and facilitate unplanned contacts."
Roll Forming of Advanced Thermoplastic Composite Materials
R. J. Dykes, September 2002
Roll forming is one of the most efficient and pervasive metal working technologies for forming metallic sheet. Recently this technology has been successfully adapted for forming a variety of fiber reinforced thermoplastic composite materials. This paper offers a general overview of the roll forming operation as well as a summary of recent advances in the processing technology. An outline of the various application areas is also summarized with particular emphasis given to the potential cost savings that can be achieved using the roll forming method.
Developments in Thermoplastic Door Modules
Maria Cilberti, September 2002
The use of door modules as a pre-assembled functional unit inside a car door is discussed. This includes reasons why a door module should be used and why a long glass fibre reinforced PP material is a good choice. As an example the development of the door modules for the new Ford Fiesta is given including the mechanical and production design of the StaMax P carrier. Special attention is paid to the excellent dimensional reproducibility of this material. Further integration potential for future door modules is also highlighted.
Applications of Carbon Fiber SMC for the 2003 Dodge Viper
Mark Bruderick, September 2002
The 2003 Dodge Viper Convertible makes the first automotive use of carbon fiber sheet molded composite (CFSMC) in nine components to provide structural performance and to achieve significant weight savings. Right and left fender support systems employ a total of six carbon fiber composite moldings. In addition carbon fibers are used to provide selective stiffening to the windshield surround and door inner structures which consist primarily of conventional glass fiber SMC (GFSMC). The design and analysis materials and process and performance of these innovative composite structures are discussed
Alternatives in Fiber Reinforced Thermoplastics
Nathan Johnson, September 2002
PowerPoint Presentation at ACCE 2002.
Creating High Performance Conductive Composites with Carbon Nanotubes
Pat Collins, September 2002
Multiwall carbon nanotubes are a very small high aspect ratio conductive additive for plastics. The high aspect ratio means that a lower loading of nanotubes is needed compared to other conductive additives. This low loading preserves more of the resins toughness especially at low temperatures as well as maintaining other key performance properties of the matrix resin.
Advanced Materials for a Smart Lightweight Design
H. Dittmar, September 2002
PowerPoint Presentation at ACCE 2002.
Sandwich Construction for Surface Transportation
Alejandro (Alex) Gutierrez, September 2002
PowerPoint Presentation at ACCE 2002.
Processing and Handling of Verton® Composites
Rick Gregory, September 2002
PowerPoint Presentation at ACCE 2002.
Process Simulation Long Fiber Thermoplastic Polypropylene Bus Seat Component
Uday Vaidya, September 2002
PowerPoint Presentation at ACCE 2002.

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How to Reference Articles from the SPE Library:

Brief version (acceptable):
Author(s), SPE-ANTEC Tech. Papers, vol. no., page no. (year).
Proper version (preferred):
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