Epichlorohydrin-ethylene oxide elastomers

Ethylene/propylene/dicyclopentadiene terpolymer Ethylene-propylene-ethylidene norbornene elastomer, adhesives Epichlorohydrin elastomer Epichlorohydrin/ethylene oxide/allyl glycidyl ether terpolymer Epichlorohydrin/ethylene oxide copolymer Polyisoprene Polyurethane, thermoplastic... 

Hydrex . See Sodium silicoaluminate Hydridocarbonyltris (triphenylphosphine) rhodium (I). See Tristriphenylphosphine rhodium carbonyl hydride Hydrin C Hydrin C-CG. See Epichlorohydrin/ethylene oxide copolymer Hydrin H. See Epichlorohydrin elastomer Hydrin T, Hydrin T-CG, Hydrin TX-1. See Epichlorohydrin/ethylene oxide/allyl glycidyl ether terpolymer Hydrine . See PEG-2 stearate Hydriodic acid... 

Epichlorohydrin/ethylene oxide/allyl glycidyl ether terpolymer elastomer, bladders... 

Epichlorohydrin. Commercial polyester elastomers include both the homopolymer and the copolymer of epichl orohydrin with ethylene oxide. The very polar chloromethyl groups create basic resistance to oil for these polymers, and they have been extensively used in fuel lines however, the desire for lower fuel permeation is causing a search to be made for other polymers (10) (see Elastomers, synthetic-polyethers). 

Epichlorohydrin Elastomers without AGE. ECH homopolymer, polyepichlorohydrin [24969-06-0] (1), and ECH—EO copolymer, poly(epichlorohydrin- (9-ethylene oxide) [24969-10-6] (2), are linear and amorphous. Because it is unsymmetrical, ECH monomer can polymerize in the head-to-head, tail-to-tail, or head-to-tail fashion. The commercial polymer is 97—99% head-to-tail, and has been shown to be stereorandom and atactic (15—17). Only low degrees of crystallinity are present in commercial ECH homopolymers the amorphous product is preferred. 

AGE-Gontaining Elastomers. ECH—AGE, poly(epichlorohydrin-fo-allyl glycidyl ether) [24969-09-3] (3), ECH—EO—AGE, poly(epichlorohydrin- (9-ethylene oxide-i (9-allyl glycidyl ether) [26587-37-1] (4), ECH—PO—AGE, and PO—AGE are also amorphous polymers. 

Polyepichlorohydrin and copolymers and terpolymers of epichlorohydrin with ethylene oxide and allyl glycidyl ether are useful elastomers [Body and Kyllinstad, 1986]. 

Polymers of epichlorohydrin and copolymers of epichlorohydrin with ethylene oxide am atactic, flexible, amorphous elastomers with the following repeating unit ... 

ELASTOMERS,SYNTHETIC - POLYETHERS] (Vol 8) Poly(epichlorohydrin-co-ethylene oxide) [24969- 10-6]... 

The coordination polymerisation and copolymerisation of heterocyclic monomers have been restricted in industry to a much smaller volume than the polymerisation and copolymerisation of hydrocarbon monomers polyether elastomers from epichlorohydrin and ethylene oxide or propylene oxide, and allyl glycidyl ether as the vulcanisable monomeric unit, are produced on a larger scale [4-7],... 

ECO Copolymer of ethylene oxide and epichlorohydrin (elastomer ASTM) see... 

Although butyl rubber is by far the most important commercial elastomer to be synthesized by cationic polymerization, several heterocyclic monomers provide useful elastomeric materials via this mechanism also. Epichlorohydrin can be polymerized to high molecular weight using a complex catalyst formed from a trialkylaluminum compound and water as shown in Eq. (58) [64, 130-132], For copolymerizations with ethylene oxide, a catalyst formed from a trialkylaluminum compound, water, and acetylacetone is useful [64,130], The mechanism proposed for these polymerizations is... 

We shall continue this study, attempting to Increase the epoxy end group content of the macromer. Capping agents other than ethylene oxide and other terminating agents will be explored. Macromer copolymerizations with propylene oxide or epichlorohydrin will be explored, attempting to prepare polyether type thermoplastic elastomers and hot-melt adhesive. 

Epichlorohydrin. Commercial polyester elastomers inclnde both the homopolymer and the copolymer of epichlorohydrin with ethylene oxide. The very polar chloromethyl gronp creates basic resistance to oil for these polymers, and they have been extensively used in fuel lines however, the desire for lower fuel permeation is cansing a search to be made for other polymers (20). Epichlorohydrin (ECO) has excellent resistance to fuel and oil swell. The ECOs show a volume swell of 35% at room temperature compared to 70% for a medium ACN-nitrile rubber in ASTM Reference Fuel C. The copolymer has a low temperature brittle point of -40°C and the homopolymer, -15°C. An interesting property of these elastomers is a stable dynamic performance over a wide temperature range however, the electrical properties are only average. 

Synthetic rubbers are produced as commodities. Polybutadiene, polybutylene, polychloroprene and polyepichlorohydrin are examples of elastomeric homopolymers. Copolymeric rubbers comprise poly-(butadiene-co-styrene), poly(butadiene-co-acryloni-trile), poly(ethylene-co-propylene-co-diene), and poly-(epichlorohydrin-co-ethylene oxide). The unsaturated group in the comonomer provides reactive sites for the crosslinking reactions. Copolymers combine resilience with resistance to chemical attack, or resilience in a larger temperature range, and thermoplastic-like properties. There are several studies in the literature describing the preparation of blends and composites of elastomers and conductive polymers. A description of some significant examples is given in this section. 

Epichlorohydrin Rubber n (CO, CEO) Any of several elastomers comprising polymers and copolymers of epichlorohydrin, with good high-temperature resistance, low-temperature flexibility, resistance to fuels, oils, and ozone, and low gas permeability. The homo-polymer (CO) is a saturated, aliphatic polyether with a chloromethyl side chain. The ECO type is an equimolar copolymer of epichlorohydrin and ethylene oxide. 

There is no official classification system for epichlorohydrin. However, Mooney viscosity (ASTM D1646) is commonly used to crudely define average molecular weight. The molar content of ethylene oxide present in ECO is important. Greater ethylene oxide present will improve the elastomer s low-temperature properties. Originally it was found that a 50 50 molar ratio of epichlorohydrin and ethylene oxide gave one of the best compromises in properties, with good low-temperature properties and only a small loss in oil resistance. 

Poly(epichlorohydrin-co-ethylene oxide) has a well-balanced profile of physical properties together with a high resistance to solvents and oils at moderate temperatnres. For these reasons it has formd many applications in the aerospace and automotive industries. In addition, this copolymer has attracted attention in the field of batteries and electrical devices, mainly because, when complexed with an inorganic salt, the elastomer can be used... 

Specialty elastomers based on epichlorohydrin have been produced by both Hercules and BF Goodrich. Elastomers have been made by copolymerization of epichlorohydrin with ethylene oxide and by terpolymerization of epichlorohydrin with ethylene... 

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