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Structural Evolution of Natural Rubber During Mechanical Mastication: Effects of Molecular Weight Distribution and Constant Viscosity Treatment

Yupan Li,Haozhi Wang,Gaorong Li,Wenfeng Peng,Hongtu Lin,Xiaoxue Liao,Lusheng Liao

This study investigated structural degradation differences in nonconstant viscosity rubber (TSR) and constant viscosity rubber (TSR CV) with two inherent molecular weight distributions (MWD) during mechanical mastication. The results demonstrated that compared with nonconstant viscosity treatment or unimodal MWD, constant viscosity treatment and bimodal MWD showed significantly retarded degradation of NR, as evidenced by molecular weight, Mooney viscosity, initial values, and macrogel content. Notably, the evolution of microgel ≥ 1 μm content exhibited divergent trends: For TSR, the microgel ≥ 1 μm content initially increased and then decreased with mastication time, whereas for TSR CV, it stabilized after partial degradation. The rheological analysis via Cole–Cole plots revealed that among all samples, the branched structure in the TSR from the Reyan73397 clone with bimodal MWD exhibited more pronounced degradation behavior, which was reflected by the variation of parameter h . These findings highlight the effects of MWD and constant viscosity treatment on the evolution of molecular chains, gel, and branching architecture during the mechanical masticating process of NR.