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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Lead-Free, Low Smoke Zero Halogen LV Power Cable Jacket
A new lead-free, low smoke zero halogen (LSZH) low voltage power cable jacket compound was developed based on customer requirements. This jacket was formulated based mainly on an ethylene co-polymer matrix with magnesium hydroxide and other inert inorganic fillers to improve and optimize overall performance. The new jacket shows enhanced dielectric and flame retardant performance with much lower smoke release while maintaining comparable mechanical properties to previous (lead-containing) formulations.
Characterization of CNT Orientation and Diameter Distribution in CNT/Polymer Composites by Image Analysis
The focus of this research is to determine the distribution function of CNT characteristics such as orientation and diameter of CNT within the polymer matrix and investigate how these characteristics affect the tensile modulus of the CNT/ polypropylene (PP) composites. An image analysis approach combining scanning electron microscopy (SEM) and a selective etching technique allows for extraction of 3D information that is used as input in a finite element model.
Morphological Characterization of Poly(Ether Ether Ketone)
The crystal structure of poly(ether ether ketone) (PEEK) has been investigated by thermal and morphological characterizations. Spherulites and lamellar structures are revealed by optical microscopy, atomic force microscopy, transmission electron microscopy and small angle X-ray scattering. A refined crystalline model is proposed to describe lamellae formation in PEEK.
Optimizing Marketing Resource Allocation Through Web Analytics
This technical paper strives to provide a high-level overview of the underpinnings and application of web tracking technology. From there, we will explore the market for this product space and outline a roadmap for successful adoption of analytics tracking in an organization. This approach can help plastics companies of any size effectively inform priorities ranging from customer relationship management to branding. The central thesis of this paper is that effective data-driven marketing depends on building a corporate culture that “competes on analytics”.
Oxidation Resistance of Polypropylene Random Copolymer Pipe to Chlorinated Water
Polyolefin pipe is known to be susceptible to oxidative degradation when used in potable water applications. Antioxidants in the polymer are washed away and/or consumed during use, leaving the pipe material susceptible to oxidative degradation. This study presents the results of testing of the resistance of random copolymer polypropylene pipe to chlorinated water and the failure mechanisms observed in the tests.
New High Flow Impact Resistant White & Jet-Black Colorable Polyetherimide-Polycarbonate Blends
A new class of polyetherimide (PEI) and polycarbonate (PC) blends has been developed. The approach was to create immiscible PEI-PC blends that were designed to have good compatibility thus providing high flow, enhanced impact strength and good weathering performance. Further, owing to the unique immiscible yet compatible blend technology, we present new PEI-PC blends that can be colored to bright white colors.
A Multi-Scale Study Evaluating the Properties of Carbon Micro and Nano Fillers
Microscale and nanoscale fillers are used to create multi-scale polymer composites with enhanced physical properties. An investigation of processing effects on microstructural evolution of the extruded composites, and the associated thermal and mechanical properties as performed. This data can then be used to develop fundamental processing-structure-property models of these multi-scale composites across different concentrations of microscale and nanoscale ingredients.
Liquid Crystal Polymer Films for Use in Food Packaging Applications
Liquid Crystal Polymers (LCPs) melt processing remains a challenge. Blown and cast films were processed byextrusion with a counter rotating mandrel die. The die rotation varied from 0 to 30 rpm with the oxygen and water barrier properties being influenced by rotation. Oxygen barrier values as low as 0.057 cc/m2- day was obtained and meets the military specification for oxygen barrier. Thermal, rheological, and mechanical testing were also performed to fully characterize the films.
In-Situ Polymerization of Graphene-Isotactic Polypropylene Nanocomposites
Isotactic Polyproyplene-Exfoliated Graphene Nanoplatelet (iPP-xGnP?) nanocomposites were prepared through an in-situ polymerization technique. Single site metallocene catalysts polymerized propylene within a dispersion of xGnP nanoparticles. The nanocomposites showed increased crystallization and melting temperatures, along with increased elastic moduli. The 1.3 wt% composite showed an increase in ductility over the neat polymer.
A Mechanism for Solid Bed Breakup in Single-Screw Extruders
Solid bed breakup in plasticating single-screw extruders can lead to defects in the downstream product, reduced rates, and process instabilities. The literature generally attributes this breakup to pressure gradients emanating from the beginning of the metering section of the screw although little evidence is available. In this paper a new mechanism is proposed that was developed as a result of the physics of the melting mechanism and fluid flows associated with screw rotation physics.
Evaluation of Planar and Uniaxial Extensional Viscosities for Linear and Branched Polyolefins
In this work, planar and uniaxial extensional viscosities for linear and branched polyolefins has been determined through entrance pressure drop technique on conventional twin bore capillary rheometr by using novel circular and rectangle orifice dies and the capability of two different constitutive equations to describe the measured experimental data has been tested.
Simulation of Distributive Mixing in a ZSK-90 Co-Rotating Twin-Screw Extruder
Mesh partitioning technique is used for three-dimensional simulation of the flow for 36 different screw orientations in a ZSK 90 co-rotating twin-screw extruder from Coperion. The predicted velocity distribution is used to trace the pathlines for 2034 particles flowing through the extruder. The pathlines are used to determine the spatial distribution of initially segregated particles, which is then used to estimate the Shanon entropy as a measure of the quality of mixing in the extruder.
Sustainability and Plastic Technology
Sustainability principles are becoming associated with best practices. This paper will cover results of a 2011 survey and implications for Sustainability in the plastics industry. We will also present a few examples from the Plastics Industry that illustrate the principles of sustainability in practice.
Effect of process parameters on properties of devulcanized rubber obtained from a supercritical CO2 assisted devulcanization process
Continuous devulcanization of tire rubber crumb was performed using supercritical CO2 in an industrial scale twin screw extruder. A reasonably high throughput extrusion process has been developed and the effect of processing conditions has been studied. Using a fractional factorial design in three levels, the effects of process temperature, screw speed, and feed rate on the sol and gel fractions and degree of devulcanization of devulcanized rubber have been investigated.
PVD Coatings to Improve Engineering Properties in Molding Tablets Applications
With the purpose to develop innovative solutions for the tablet tooling sector in pharmacy industry, in order to improve the behavior of punches and dies in service and improve the extraction, decrease wear and decrease the risk of contamination, this experimental work presents the development of thin films by PVD, studied in the ambit of a large project of Engineering & Tooling sector, namely Tooling EDGE.
The New PC/PMMA Blend Materials having High Scratch Resistance and High Transparency
In general, a blend of PC and conventional PMMA is immiscible and its appearance is opaque such as pearl-like gloss. This new material using new PMMA modified chemical structure improved miscibility between PC and PMMA, and this material could be enhanced surface scratch resistance keeping with high transparency. Other features of this new material are 1) superior impact strength and heat stability than PMMA and 2) better flowability than PC high flow grade.
A New High Flow Copolycarbonate Resin Meeting the Requirements of the New Europen EN 45545 Train Standard
A new copolycarbonate resin has been developed that meets the Hazard Level 3 (HL3) requirements for the new European rail standard EN 45545, including the heat release, smoke density and toxicity requirements. This resin is designed for high melt flow, while retaining good practical impact properties. As such, this resin is the ideal candidate for injection molding of train seat back shells with compliance to the new EN 45545 standard. Finally, new FR technology has led to a fully halogen-free product.
Cemented Tungsten Carbide: An Innovative Material For Custom Core Pins in the Plastic Injection Molding Industry
Cemented tungsten carbide has revolutionized productivity in many applications throughout many industries and when used as a material for core pins has proven to reduce cycle time, increase core pin rigidity and extend core pin life in the plastic injection molding industry resulting in significant cost savings. To achieve profitability in the increasingly competitive global marketplace plastic injection molding plants must operate with maximum efficiencies and minimal unplanned downtime.
Color Compatibilty of Thiol-ene nail polish Formulation
Thiol-ene chemistry is a emerging and environmentally friendly polymer synthesis. It is therefor obvious that new applications would be sought for the process. Currently, the use of Thiol-ene chemistry is being investigated for use as a replacement chemistry for nail polish. However, a nail polish formulation requires a consistent and aesthetically pleasing application of colorant. Our project looks at the application of colorants to Thiol-ene coatings.
Select Properties of a Rotationally Molded Polyethylene/ Nanoclay Composite
A composite material consisting of 5 percent weight of nanoclay and polyethylene was prepared by twin screw compounding. The resulting material in pellet form was ground and rotationally molded. A RotoLog was used to determine melt completion in the mold and the resulting test box was tested for low temperature impact and tensile properties versus those of the control material.
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