Amorphous Thermoplastics Essay

8784 words - 36 pages

16 Upon curing they shrink more as compared to amorphous thermoplastics. Examples are polypropylene (PP), polyethylene (PE) [1].

S. Amin and M. Amin In order to resolve the problem of low thermal and chemical stability of thermoplastic elastomers, dynamic vulcanization techniques were used in late ] plastic. In dynamic vulcanization the thermoplastic and elastomers are both cross-linked and physically mixed together. This gave rise to a second generation of thermoplastic elastomers which had better tensile strength and oil resistance as compared to those formed by physical mixing only [8]. ] ] ] _ were introduced which were made by same dynamic vulcanization process but using natural and ...view middle of the document...

They exhibit the properties of both plastics and rubbers. The unique properties of both materials exist because TPE materials are created only by physical mixing of a thermoplastic and elastomer and no chemical or covalent bonding exists between the two. This behavior has opened a new field of polymer science. Thermopalstic elastomers have become a significant part of the polymer industry. They are used in many applications like adhesives, footwear, medical devices, automobile parts house hold goods, etc. TPE were introduced commercially in 1960. ] ] ] _ ] annual consumption of TPE materials is growing at a rate of 11% per year. The first generation TPE were made using Ethylene Propylene Diene Monomer (EPDM) and ppolypropylene(PP) [5-7]. Later on Ethylene Propylene Rubber (EPR) replaced EPDM due to its low cost. Since these materials were mixed only physically and no cross linking existed there so hard thermoplastic cannot be produced using them. Another draw back is that both EPR and EPDM have low tensile strength and less resistance to organic solvents especially oil or grease.

1.4. Uses of thermoplastic elastomeric materials
There are countless applications where thermoplastic elastomeric materials are used. Major applications include replacements for artificial and natural rubber, foam making, soft and hard thermal insulation sheets, door and window handles for household and automobiles, car dash boards, car dash boards knobs, bumpers, CV joint boots, suspension bushings, window & door trim, seals, floor Mats, gear Knobs, flexible grip, mirror case, automotive gaskets, colored interior components and many other body parts, house hold plastic furniture, coat hangers, lacquer, varnishes, paints, latex, adhesives, weather stripping applications, shoe soles, sports equipment, electrical accessories, expansion joints, water sealing rubbers, pipes, belts, ring gaskets, electronics appliance casings, handles for knives, scissors, and other non slip grip equipment, food packaging cling films, syringes, nabulizers, catheters, components for gas masks, flexible tubing for various applications, toys, plastic eye wear, asphalt modification, personnel hygiene equipment like razors, shavers, safety equipment, casings for lead acid batteries, document lamination films, packing foam, blister packs of mediices, workshop helmets, lenses for cameras, projectors and copiers, soft contact lenses for eyesight, vials, monitors, medical devices like IV sets, blood bags seal, urine bags seal, and latest in replacement of metals in many

Thermoplastic elastomeric (TPE) materials and their use in outdoor electrical insulation Table 1. Common thermoplastic elastomeric materials. Amorphous Low cost PVC SAN PS PMMA ABS SMA Poly Vinyl Chloride Styrene Acrylo Nitrile Poly Styrene Poly Methyl Metha Crylate Acrylonitrile Butadiene Styrene Styrene Maleic Anhydride Poly Phenlene Oxide Poly Carbonate Poly Phthalate Carbonate Poly Tetra Fluoro Ethylene(Teflon) Poly...

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