Effect of Hydrogenation on the Properties of Polybutadiene Rubbers

Autor:	V. N. Reikh, A. I. Yakubchik, B. I. Tikhomirov, A. V. Pavlikova
Rok vydání:	1962
Předmět:	Degree of unsaturation Materials science Polymers and Plastics law.invention Crystallinity Polybutadiene law Ultimate tensile strength Materials Chemistry Elongation Composite material Crystallization Elasticity (economics) Glass transition
Zdroj:	Rubber Chemistry and Technology. 35:1052-1059
ISSN:	1943-4804 0035-9475
DOI:	10.5254/1.3539963
Popis:	1. The properties of hydrogenated sodium polybutadienes of various degrees of unsaturation were studied. The tensile strength and relative elongation of the vulcanizates have minimum values when the degree of unsaturation has been decreased by about one half. Elasticity and gas permeability of the vulcanizates decrease and the hardness increases with diminishing unsaturation. The resistance to thermal aging also increases. Order in the polymer chains has a favorable effect on the relative elongation and tensile strength of vulcanizates even if it does not lead to crystallization. The improvement of the freeze resistance of vulcanizates made from hydrogenated sodium polybutadienes is associated with the internal plasticization effect. 2. Studies of the properties of hydrogenated cis-l,4-polybutadienes, which have appreciable crystallinity, showed that vulcanizate elasticity decreases while the hardness increases sharply with decreasing unsaturation. The rise of the glass transition temperature is due to increased rigidity of the polymer chains.
Databáze:	OpenAIRE
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