Polybutadiene cis-trans-vinyl

FIG. 14-2. Dependence of diffusion coefficient of n-hexadecane on the degree of cross-linking in three polymers in the rubberiike state at 25°C. (PB) 1,4-Polybutadiene, cis trans vinyl = 40 53 7 (NR) natural rubber (pips denote four different initiai molecular weights before cross-linking, from 2.3 to 7.7 X 10 ) (SBR) styrene-butadiene random copolymer, 23.5% styrene. Abscissa is moles effective network strands per cubic centimeter estimated from swelling measurements. (Chen. )... 

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