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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Estimate of Astm Melt Flow Rates from Oscillatory Shear Rheology
ASTM Melt Flow Rate is one of the most common product specifications and is widely used by resin manufacturers and users. Small Amplitude Oscillatory Shear (SAOS), on the other hand, is the preferred rheology data for researchers. A one-to-one correlation between these two kinds of rheology data has not been observed or reported in the past. With a new approach of applying the Cox-Merz Rule, excellent estimates of ASTM melt flow rates were obtained from the SAOS data for a wide range of linear polyethylene resins.
Improvements in Processing Semi-Crystalline Polymers for Thermoforming Sheet in Multiple Nip Systems
Covering higher output rates in the production of thermoforming sheet motivated the development of a new roll-stack design. While amorphous materials like HIPS and A-PET are not sensitive to cooling parameters, the quality of sheet made of semi-crystalline polymers like PP and PE is showing a great dependency on their cooling history. In the daily production environment not only higher outputs were achieved, but improvements in quality and performance were obtained.
A DSC Method to Determine Temperature Uniformity in BOPA Annealing Oven at Transverse Direction
A DSC method was demonstrated to determine the temperature uniformity at transverse direction in BOPA annealing oven by utilizing the existence of small endothermic peak before the melting of alpha-form (221 øC) and /or gamma-form (214 øC) nylon 6 on 1st heating thermograph.
Extrusion Screws for Thermoplastic Composites
Thermoplastics are often compounded with fillers including talc, mica, calcium carbonate, and nanoclays. These materials often shorten the service life of the processing equipment. This paper describes the screw wear and the processing performance differences that commonly occur with these materials. Remediation techniques are presented.
Visualizing 3D Polymer Foam Structure Characteristics with Optical Tomography
Optical tomography (OT) is a method that allows volumetric measurements from translucent samples. It is used in medicine and the measurement principle is similar to X-ray computed tomography. Plastics samples are often translucent and are thereby viable for OT measurements. The volumetric foam structure of polymer foams can be visualized using OT.
Vegetable-based Copolymers Based on Blend of Acrylated Epoxidized Soybean Oil and Tung Oil
A biorenewable thermosetting polymer was synthesized by copolymerizing acrylated epoxidized soybean oil and tung oil using a free radical polymerization method. It is found that tung oil acts as a plasticizer in acrylated epoxidized soybean oil. This article presents a simple, versatile, and environmentally friendly technique to produce thermosets with a wide range of thermo-mechanical properties.
Binary and Ternary PET Blends
This study is related to PET with minor amounts of polycarbonate and PE-LLD. Depending on the shearing in the melt, a minor amount of PC is fully miscible, or exists as nano domains in the PET matrix. On the other hand, PE-LLD is immiscible with PET even in a minor concentration, and it forms micron-sized domains. In a ternary blend of PET, PC (2%) and PE-LLD (3-5%), surprisingly the PC acts as a compatibiliser for the PE-LLD and reduces its domain size in the polymer matrix.
Benefits and Limitations of Ultrasonic Film Sealing
Ultrasonic sealing of thermoplastic films is growing in acceptance throughout the plastics industry, primarily within packaging applications. Reducing the amount of film required for a given application is typically what drives consideration of ultrasonic sealing. However, superior seal quality, the ability to seal through contaminants, and improved process control are becoming increasingly important factors. This document describes the expected benefits of the ultrasonic sealing of films as well as limitations to be considered.
X-Ray Methods: Examples of Contributions to the History of Pigments
The use of X-ray and spectroscopic methods has been essential to the development and understanding of pigments in the 20th and 21st centuries. In this presentation I will provide some examples of the more pertinent of the developments made possible by the use of these powerful tools.
Exploration of Surface Interactions of Polymer Blended Bioconjugates
Various surface energy models were applied to amino acid-triazole based conjugates, each blended with polymers such as polyethyleneglycol diacrylate (PEG), t-butyl acrylate (TBA) and diethylene glycol (DEG). The Zisman model and the Owens/Wendt model, among others, were evaluated to determine the surface energy of the various amino acid and polymer compounds. In some cases the biofilms were grown in the presence of the amino acid conjugates as well as polymers to determine the extent of its antimicrobial activity.
Novel Impact Modifier Alternative for Glass Fiber Reinforced Polymers
Flexil? is a novel modified organosilicon based additive developed and marketed by Polymer Dynamix, LLC in South Plainfield, NJ. Flexil? provides the impact modification to glass fiber reinforced polymers. The results demonstrate that Flexil? increases the elongation and impact properties in glass reinforced polymers such as polybutylene terephthalate and polyamide.
Review on Micr-/Nano-Layer Enhanced Barrier Technology
Recent developments having a potential to produce purely polymer based, transparent barrier packaging films are reviewed. The focus of this review paper is on micro-/nano-layer enhanced barrier improvment technology. This technology allows a significant barrier property improvment by controlling crystal lamellae alignment in various barrier polymers. The critical parameters affecting crystal lamalle orientation are briefly described as well.
Co-Extrusion of Continuous Fiber Composites with High Mechanical Properties
Continuous fibrous composite tapes of PA6/PEO were produced using a novel co-extrusion and two-dimensional multiplication technique. The process is highly versatile in that the number and composition of PA6 fibers and the geometry of the tape can be easily adjusted for various applications. The PA6 fibrous tapes were post-oriented to achieve ultrahigh mechanical properties. In comparison with commercial fibrous composite tapes, the PA6/PEO tapes made using the co-extrusion technology have improved tensile modulus, tunable tensile strength and strain at break.
Changeable Thermal Management for LED-Lighting
Thermal management of LED lights can be arranged by deliberately influencing lighting components conduction capabilities and reducing the thermal contact resistance for various joining processes. The research details the possibilities thereof and shows the thermal contact resistance of plastic and aluminum joining for different connection processes.
Failure Analysis of a Glass Filled Phenolic Resin Power Steering Pump Pulley
A root cause failure analysis was performed on a glass filled phenolic resin power steering pump pulley that was implicated in an automobile accident. A thorough investigation including vehicle inspection, macroscopic and microscopic examination, stress analysis, and exemplar testing was performed to test two competing hypotheses postulated to explain the failure. This paper details these various steps and identifies the ultimate root cause.
Packaging and Food Interactions Modeling: Validation for Compliance with Specific Migration Regulations
A validation model for compliance with specific migration regulations based on the EU standard 10/2011 about plastic materials and articles intended to come into contact with food will be presented. This article describes the implementation of the numerical model used for the migration calculation, which is validated by comparing it to other models available in the state of art. A case study is presented to show the benefits of this model.
Part Designers? Best Ally ? An Automated Design Checker
For a plastic part or assembly to perform as expected, proper consideration has to be given to material selection, part design, tooling, and processing. A deficiency in any one of these requirements will nullify the other three attributes, even if they are highly optimized. This paper reviews all four requirements, giving special attention to the design aspect. The paper also introduces a quick and easy to use design checking tool that will be of tremendous advantage to designers, both new and experienced.
Polypropylene Impact Copolymers for Improved Tiger-Marking Resistance in Large Part Injection Molding
This work will focus on Polypropylene Impact Copolymers (ICPs) aimed at reducing the surface aesthetic defect known as tiger-marking which is formed during large part injection molding of compounded thermoplastic olefins. Emphasis will be placed on rheological predictive testing and how this translates to the final part aesthetic performance.
Qualifying a Recycled Material with Stringent Engineering Properties Requirements Using Six Sigma
Recycling commodity plastics with non-stringent mechanical requirements present few technical changes other than justifying the cost of recycling. When considering recycled engineering plastics for high end products with very tough mechanical, cosmetic (including custom color), processing, cost and reliable availability requirements with minimal lot to lot variation, it becomes a much bigger challenge. This paper deals with a successful case study in overcoming these challenges.
Numerical and Experimental Studies on Bubble Nucleation and Growth during Microcellualr Injection Molding
This paper presents a study on bubble nucleation and growth during the microcellular injection molding process. A three-dimensional flow simulation program for prediction of bubble nucleation and growth in microcellular injection molding has been developed. Several models for bubble nucleation in microcellular injection molding have been evaluated using the simulation program. Some experiments were conducted to measure the bubble density and size in a molded part and the simulation results were compared to the experimental results.
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