Relations Between Wallace Plasticity and M_w for Natural Rubber

摘要

Wallace plasticity and the weight-average molar mass (M_w) were measured on natural rubber rubber samples of different origins.A sigmoidal model describes the relations between Wallace plasticity and M_w (0.872>#UPSILON#~2 > 0.992) for given families of samples.The families of samples analyzed differed through their clonal origin,collection method (cup lumps or latex),and type of processing (CV or non-CV).This study showed that two samples of natural rubber can e identical in terms of plasticity,but very different in terms of the average polyisoprene chain length or M_w.