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.
|= Members Only|
HIGH GAIN LEXAN DIFFUSER FILM FOR LCD DISPLAYS
Driven by increasing demand for advanced optical films for LCD displays, a new generation of micro-lensed diffuser films is introduced. Engineered film topography provides light turning functionality for optimum redirecting of source light, through the LCD panel, towards the viewer. Factors affecting film's ability to redirect light are discussed. A new generation of monolithic Lexan display films having higher luminance gains, is introduced. Performance gains in actual LCD displays are demonstrated, and film making process is reviewed. Up to 10% luminance improvement over standard micro-lensed films was realized, while retaining inherent strength and dimensional stability attributes of monolithic polycarbonate films.
IONOMER MODIFIED ASPHALT
The structure and properties of ionomer modified asphalt were investigated. The thermal properties, morphology and rheology of four concentrations of a Pen grade 64-22 asphalt and the zinc salt of a poly (ethylene-co-methacrylic acid) were studied. After establishing the linear viscoelastic range of response through strain sweep, frequency sweep at a temperature range of 30-80C were conducted to study the dynamic mechanic properties of the modified blends. The ionomer modified and base asphalt samples were subjected to simulated real life conditions such as long and short aging, high and low service temperatures. Better performances were achieved by the modification
SELF FORMATION OF MUCELL FROM PS/POLYANILINE-HALLOYSITE CLAY (PHC) INJECTION MOLDING
In this work, we introduce an alternative approach to microcellular injection molding, which does not require any equipment modifications. We have developed an additive which is compounded with the thermoplastic pellets which are then run in standard injection molding equipment. The additive was produced by an in-situ polymerization of polyaniline into Halloysite-Clay, where the HC is naturally exfoliated because of its tubular shape and uniform surface charge. The PANI has the function of adsorbing both water and CO2 gas. Preliminary results show that cycle time can be decreased without an adverse effect on part dimensional stability and mechanical properties.
RAPID DETERMINATION OF CURE RATE AND DIRECT IDENTIFICATION OF SPATIAL VARIATIONS IN CROSS LINK DENSITY
Traditional bulk thermal analysis provides a sample-averaged result and cannot generally supply sufficient information about complex structures or heterogeneities within polymeric systems. A nanoscale thermal probe heats a localized region on the sample surface to measure its thermal transition temperatures. Transition temperature microscopy (TTM) enables these measurements to be carried out rapidly at a succession of points, thus creating automated high-resolution spatial maps of the thermal properties. We demonstrate how nanoTA can be used to characterize cross link density and to study cure rate in a time resolved manner.
MANUFACTURING OF MICROPELLETS USING RAYLEIGH DISTURBANCES
The goal of this research work is to prove the capability of manufacturing spherical polymer micropellets of a unit size using Rayleigh disturbances. This phenomenon describes the breakup of a liquid stream into droplets while being deformed by another fluid under a competing force field that results from surface tension effects. Here, a polymer melt was surrounded by a jet of hot air in a special nozzle. The main focus of this work is on the design and construction of the micropelletizer and the search for a process window that results in break-up. Micropellets were successfully manufactured.
IDENTIFYING CONTAMINANTS IN PLASTIC PELLETS AND HANDLING SYSTEMS: ANGEL HAIR, SNAKE SKINS, POLYMER FINES, WAXES AND LUBRICANTS
Mechanical processes used to make plastic pellets and transport them through manufacturing, shipping and end-use can create contaminant bodies. These bodies include normal polymer fines, high-melting polymer (angel hair, snake skins), surface applications like lubricants and waxes and oligomers. They cause various problems in material handling, processing and product performance. Analytical laboratory techniques can readily provide the identification needed to specify corrective actions. Examples from polyamide processing are discussed.
IONOMER MODIFIED ASPHALTS
The structure and properties of ionomer modified asphalt were investigated. The thermal properties, morphology and rheology of four concentrations of a Pen grade 64-22 asphalt and the zinc salt of a poly (ethylene-co-methacrylic acid) were studied. After establishing the linear viscoelastic range of response through strain sweep, frequency sweep at a temperature range of 30-80‹?øC were conducted to study the dynamic mechanic properties of the modified blends. The ionomer modified and base asphalt samples were subjected to simulated real life conditions such as long and short aging, high and low service temperatures. Better performances were achieved by the modification.
THE ROLE OF PARTITIONING OF ORGANOCLAY ON MICROFIBRILLAR MORPHOLOGY DEVELOPMENT OF PP/PBT BLEND NANOCOMPOSITE FIBERS
The aim of this work was to provide an insight on the effect of partitioning of organically modified montmorillonite (organoclay) on the droplet deformation and resulting microfibrillar morphology development in melt spun Polypropylene/Poly(butylene terephthalate) /Organoclay blend nanocomposite fibers. The samples with the same blend ratio (80/20) but varying in organoclay content were prepared with and without the compatibilizer by using a melt intercalation process in a co-rotating twin screw extruder. It was demonstrated that presence of nanoclay in multi blend system can play different roles on the extent of microfibrils formation depending on nanoclay partitioning.
EFFECT OF PRESSURE ON CRYSTALLINITY OF INJECTION MOLDED POLYPROPYLENE/ETHYLENE-OCTANE COPOLYMER BLEND:BE DIFFERENT ON CRYSTALLIZATION KINETICS
In this experiment, a different effect of pressure on crystallinity and crystallization kinetics was found compared with anterior research. This experiment is concern with the effect of holding pressure on crystallinity of isotactic polypropylene (iPP) in injection molded polypropylene (PP) /Ethylene Octane Copolymer (POE) blends with fixed weight ratio (75/25). Sliced samples cutting from the midway of the moldings were investigated by differential scanning calorimetry (DSC). Absolute crystallinity of PP of every sample with different depth can be calculated. Crystallinity was found to be decreased with increasing holding pressure although the crystallization kinetics was accelerated.
EXTRUSION OF POLYPROPYLENE AND HYDROCARBON RESIN BLENDS
Hydrocarbon resins (HCR) can be extruded with polypropylene resin (PP) directly from the dry blend to save tolling cost from a masterbatching process.?ÿ Up to 20% of HCR has been successfully extruded using a single screw extruder. The screw design and processing temperatures are critical to avoid surging and to achieve a comparable output rate as PP.?ÿ Barrier screws with Maddock type mixing section were used to compare extrusion performance.?ÿ Internal pressures along the screw were monitored to determine the process bottleneck and to optimize the processing conditions. Extrusion performance is presented at different blend ratios and screw designs.
ESTIMATION OF TEMPERATURE INCREASE IN A PARTIALLY FILLED ZSK-90 COROTATING TWIN-SCREW EXTRUDER USING MESH PARTITIONING TECHNIQUE
The velocity distribution predicted by an isothermal simulation of the flow in a co-rotating twin-screw extruder is used to estimate the heat generated due to viscous dissipation. If the conveying and mixing elements of the extruder are assumed to be fully filled, the predicted temperature increase is much larger than the corresponding experimental values. If the temperature increase is calculated based only upon heat generated in the portion which has positive value of pressure, that is, the portion which is fully filled, the predicted temperature increase matches closely with the corresponding experimental data.
PHYSICAL PROPERTY RETENTION OF EXTERIOR AUTOMOTIVE MOLD-IN-COLOR PLASTICS AFTER UV EXPOSURE
This paper explores the UV weathering performance of Mold-In-Color plastic technologies used for exterior trim applications. The focus is the retention of physical properties after exposure to lab UV radiation that simulates actual outdoor exposure. Various test specimens are exposed to Xenon Arc UV radiation then tested for mechanical properties vs. unexposed controls. Samples are also analyzed for change in color and gloss. Finally the parts are analyzed for surface chemistry changes via infrared spectroscopy and surface morphology. These analysis are correlated with physical property changes
RHEOLOGICAL MORPHOLOGICAL RELATIONSHIP IN IMMISCIBLE AND REACTIVELY COMPATIBILIZED SAN/EPDM BLENDS
In immiscible blend of SAN/EPDM a coarse morphology is formed. In reactive blends, formation of graft at the interface causes fine stable droplet morphology. Favis equation shows at 17 wt% of graft the size of EPDM would be minimum. The interfacial tension of the blends determined by Palierne and Choi-Schowalter models shows minimum value at 1 phr initiator. The droplet morphology is changed to composite in two step blending method. A higher apparent volume fraction of EPDM in the blend with composite morphology which has been also obtained by Kerner equation is an indication of the evolution of composite morphology.
Practical Rheology and its Role in Polymer Processing
Powerpoint Presentation at Polyolefin Conference 2011
Practical Rheology and its Role in Polymer Processing
Rheology is the science of material flow behavior, which is a very complex and multi-dimensional science. Even though it is complex, it also is quintessential to understand in order to optimize the processing of polymers. Knowing the difference between amorphous and crystalline polymers, what Melt Index really tells, and the effects of melt temperature on melt fracture are all important elements in the understanding of rheology. A simple understanding of what polymer rheology is and how shear and temperature can affect the flow characteristic of a polymer may make a big difference in the P & L of a company.
Sustainability with Automotive Carbon Fibre Composites: Reclaimed Carbon Fibre — cPBT Thermoplastic Composite
PowerPoint Presentation at Automotive Composites Conference and Exhibition
Thermoplastic Overmolded Continuous Fiber Structures
PowerPoint Presentation at Automotive Composites Conference and Exhibition
Design and Fabrication of a Structural Composite Automotive Underbody
This paper describes the design and fabrication of a structural composite underbody by the Automotive Composites Consortium. This includes material and process development joint methodology and design design of the component manufacture and design scenario and initial fabrication of the underbody.
Properties and Molding of a Fabric SMC for a Structural Composite Automotive Underbody
The glass fabric SMC developed by the Automotive Composites Consortium for a structural composite underbody was compounded molded and characterized for material and thermal properties and NDE techniques evaluated for damage inspection.
Mechanical & Impact Response of Recycled Thermoplastic & Flyash Foam Composites
The heavy transport industry has a significant amount of scrap generated in the manufacture of parts such as trailer bodies and structural components. Presently that scrap is landfilled. This paper presents the processing and resulting properties of recycled thermoplastic composites into useful products for reuse in transportation and related applications.
We're sorry, but your current web site security status does not grant you access to the resource you are attempting to view.
Any article that is cited in another manuscript or other work is required to use the correct reference style. Below is an example of the reference style for SPE articles:
Brown, H. L. and Jones, D. H. 2016, May.
"Insert title of paper here in quotes,"
ANTEC 2016 - Indianapolis, Indiana, USA May 23-25, 2016. [On-line].
Society of Plastics Engineers
Note: if there are more than three authors you may use the first author's name and et al. EG Brown, H. L. et al.
If you need help with citations, visit www.citationmachine.net