Stress relaxation of peroxide and sulfur vulcanizates of natural rubber

摘要: Abstract Direct chemical investigation of the degradation polymeric networks is usually impracticable owing to experimental difficulty insolubility and fact that reaction at only a small proportion network units sufficient cause marked alteration structure. Resort has, therefore, be made measurement physical changes brought about by reactions. Change tension constant extension useful measure for this purpose, since statistical elasticity theory predicts direct proportionality between number chains supporting stress. The present purpose is: (1) describe stress relaxometer possessing certain advantages over previous models; (2) report on relaxation peroxide-crosslinked rubber, which can considered from viewpoint simplest possible rubber network; (3) point out some complications in behavior sulfur vulcanizates, (4) interpret shape...