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
Rebuilding Screws for Injection Molding Processes
Improper rebuilding of screws for injection molding plasticators can lead to screws with high wear rates and the formation of resin degradation products. Resin degradation can cause black specks and color streaks in injection molded parts, reducing the yield and profitability of an injection molding process. This paper presents two problems that occur when injection molding screws are not rebuilt properly.
Study on Interphase Transfer of the Liquid Tackifier between Immiscible Rubber Pair
The transfer phenomenon of a third component between immiscible rubber pair was studied using natural rubber (NR) and poly(isobutylene) (PIB). The coumarone-indene tackifier was employed as the third component. After the laminated rubber sheets were annealed at various temperatures, the tackifier distribution was characterized by the dynamic mechanical analysis (DMA) and differential scanning calorimetry (DSC). It was found that the tackifier transfer between the rubbers occurs. Furthermore, the amount of the tackifier in each rubber depends on the ambient temperature.
Structure and Acoustical Property of Polyolefin Film/Foam Alternating Multilayer Composites
A novel alternating film/foam multilayer sheet was prepared through multilayer co-extrusion. The film layer was a blend of LLDPE with poly(ethylene-octene) elastomer (POE) and the foam layer was cross-linked and foamed POE. The multilayer film/foam sheet exhibited advantaged acoustical properties. In select wavelength regions, the sound absorption coefficient of the multilayer film/foam structure improved 2-3 times compared with conventional single-layer materials.
Effects of Barrel and Screw Heating in Rubber Extrusion
This paper deals with the effects of barrel and screw heating in rubber extrusion particularly with regard to the throughput and the melt temperature. To determine exactly the impact of heating on throughput behavior during extrusion, experimental investigations were conducted on two rubber extruders of different sizes. In addition, numerical flow simulations were carried out for non-isothermal shear thinning melt flows, under consideration of dissipative heating in the screw channel.
Novel Poly (Lactic Acid) Foams: Micro to Sub-Micron Size Transition
Chemical modification of poly(lactic acid) (PLA) through a reactive extrusion process was performed in the presence of a free-radical initiator and multi-functional chain extenders. Batch foaming, using nitrogen as the blowing agent, was done at various temperatures to differentiate the effect of chain branching and nucleation on the cell size of reactively modified foams. Depending on the conditions very fine, sub-micron size foams were obtained in reactively modified PLA.
Process Optimization of Single-Screw Extrusion Systems for Polyolefin Resins
Many existing extruders running polyethylene (PE) resins can be optimized to operate at higher production rates and also with higher qualities by the mitigation of gels. This paper provides an assessment process where the extruder is studied for potential rate increases and quality improvements. It is recommended that such an assessment be made prior to purchasing new screws or when a line is close to becoming sold out and more product is required.
Testing Fused PVC Water Pipe with the ISO 13477 S4 Method for Critcal Pressure
While a test method for thermoplastic pipe to determine resistance to rapid crack propagation has been standardized for nearly 20 years, very little testing of PVC for water use has been done. Test methodology and results are presented in this paper for the S4 testing for water for fused PVC manufactured to the AWWA C900 PVC pipe standard, Critical pressure, crack speed, and decompression wave speed are discussed..
Characterizing an Extrusion Process Using Design of Experiment (DOE)
Including an explanation of design of experiment (DOE) principles, this paper describes the procedures and results of a designed extrusion experiment. The goals were to understand and model the influence of key process variables (barrel zone temperatures and screw speed) on several performance indicators, such as output, pressure variation, and temperature variation. One important finding was a quadratic model of melt temperature variation, primarily as a function of screw speed and barrel zone 1 temperature.
Reduced Adhesion Strippable Insulation Shields Using Nano-Scale Mineral Fillers for TRXLPE Insulated Medium Voltage Power Cables
Semiconducting insulation shield compounds with reduced adhesion to tree retardant cross-linked polyethylene (TRXLPE) are presented. Through a combination of additives comprising 5% by weight of the formulation or less, adhesion force can be reduced by 40% or more without compromising other critical properties such as volume resistivity, cure kinetics, and physical characteristics including tear strength.
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
Abstract
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.
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