Propylene oxide rubbers

This elastomer is a sulfur-vulcanizable copolymer of propylene oxide and allyl glycidyl ether. Its vulcanizates are particularly attractive for dynamic uses, where high resihence, excellent flex life, and flexibility at extremely low temperatures are required. It performs similarly to NR in these applications, but it also has the added advantages of (1) good resistance to aging at high temperatures, (2) good ozone resistance, and (3) moderate resistance to loss of properties in contact with fuels and/or some solvents. The surfaces of this elastomer should be 

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Epichlorhydrin rubbers (CO, ECO and AECO)—Chapter 19 Propylene oxide rubber (GPO)—Chapter 19... 

Polyoxymethylene, polyformaldehyde Propylene oxide rubber Polypropylene Poly(phenylene ether) Poly(para-methylstyrene) Poly(phenylene oxide)... 

OASIS operational automated schedule infor- OPR propylene oxide rubber... 

OPR Oxypropylene rubber [poly(propylene oxide) rubber]... 

Propylene oxide rubbers (PO rubbers) These materials were first announced in 1963 (Gruber et ai, 1963 1964) and are copolymers of propylene oxide with a cure-site monomer (usually allyl glycidyl ether used to a proportion of about 10% of the total monomer). Their structures may be represented by ... 

MOR Morales, E. and Acosta, J.L., Polymer solubility parameters of poly(propylene oxide) rubber from inverse gas chromatography measurements, Polym. J., 28,127,1996. 

Second, these catalysts are not only useful for preparing high molecular weight poly(propylene oxide) rubber (2), but they are equally effective when used with certain low molecular weight hydroxyl containing compounds (initiators) to form poly(propylene ether) polyols having good hydroxyl functionality. The latter feature of these catalysts is the topic of this paper. 

The mechanical properties of propylene oxide rubbers (copolymers of propylene oxide and allyl glycidal ether) depend both on the catalyst used in preparing the polymer and on the comonomer content. The mechanical properties are very much influenced by the ability of propylene oxide stereosequences in the copolymer to crystallize. The crystalline material can give a substantial Increase in modulus and in the strength of the polymer on stretching. 

Vulcanization and Stabilization Studies on Propylene Oxide Rubber... 

Polyepichlorohydrin and poly(propylene oxide) rubbers have been discussed recently (82). World usage of polyepichlorohydrin rubber is 20-22 million pounds (9-10,000 metric tons) per year and has a growth rate of 7-8 percent per year. It is used mainly in the automotive industry, where advantage is taken of polyepichlorohydrin s excellent ability to withstand ozone and heat and its good air- and oil-permeability characteristics. Worldwide demand for poly(propylene oxide) rubber is about 1-2 million pounds (450-900 metric tons) per year. This rubber is effective in high-performance tubing applications that need both high-temperature resistance and the properties of natural rubber. Poly (propylene oxide) rubbers have upper use-temperature limits of 145°C, compared to 110°C for natural rubber. 

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