By N.J. Mills
Polyolefin Foams are a comparatively fresh improvement in comparison to the opposite different types of foam. issues lined during this overview contain: processing and the houses required for profitable foam creation, the molecular buildings worthwhile, the mechanical and thermal homes and the way those can be utilized to most sensible virtue, markets and purposes. The evaluation is followed through round four hundred abstracts from the Polymer Library database.
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23 BSEN 13158, Protective Clothing – Protective Jackets, Body and Shoulder Protectors for Horse Riders – Requirements and Test Methods, 2000. 24 A. J. Mills, Accident Analysis and Prevention, 1996, 28, 525. J. J. 9-46. 26 S. J. Mills, Performance of football shin guards for direct stud impacts, Sports Engineering, 2004, accepted. 27 FMVSS 201 U, Occupant Protection in Interior Impact, 1998. 28 G. A. M. J. Schuster, F. G. Haardt and W. Lenz, SAE Transactions, 1995, 104, Section 5, 394. 25 Polyolefin Foams Acronyms and Abbreviations BETA British Equestrian Trade Association CFC chlorofluorocarbon DMTA dynamic mechanical thermal analysis EPDM ethylene propylene diene monomer EPE polyethylene bead EPP expanded polystyrene ESI ethylene-styrene interpolymer EVA ethylene vinyl acetate FEA finite element analysis HCFC hydrochlorofluorocarbon HDPE high-density polyethylene HIC head injury criterion HMS high melt strength LDPE low-density polyethylene LLDPE linear low-density polyethylene MWD molecular weight distribution PE polyethylene POE polyolefin POP polyolefin plastomers PP polypropylene PPO polyphenylene oxide PU polyurethane PVC polyvinyl chloride SEM scanning electron microscope SS steryl steramide STP standard temperature and pressure Tg glass transition temperature TPV thermoplastic vulcanisates 26 References and Abstracts Abstracts from the Polymer Library Database Item 1 Blowing Agents and Foaming Processes 2003.
5, CD-ROM, 012 EFFECT OF VISCOSITY ON LOW DENSITY FOAMING OF POLY(ETHYLENE-CO-OCTENE) RESINS Vachon C; Gendron R Canada,National Research Council (SPE) Poly(ethylene-co-octene) copolymers with differing melt flow indices, crosslinked using dicumyl peroxide (DCP), were characterised by dynamic rheology and elongational viscosity studies. 54 wt% DCP and azodicarbonamide blowing agent were evaluated in relation to the polymer rheological properties. It was concluded that to obtain a good foam required a balance between polymer viscosity and branching, and also that crosslinking is required to maintain expansion and to prevent collapse.
Increasing the saturation pressure increased cell nucleation, so that samples processed at high pressures had higher cell densities and reduced cell sizes. Foaming was promoted by increasing the time of polymer exposure to carbon dioxide prior to extrusion, attributed to the dependence of cell nucleation on the mount of dissolved gas. Dissolution of carbon dioxide in LDPE at higher temperatures restricted foaming and resulted in gas bubbles on the extrudate surface. The thermal properties of HDPE were not modified by foaming, attributed to the high crystallisation rate.