Influence of coagents on Payne effect of butadiene rubber vulcanizates

• Published in: Polymer (Guilford) 2021-01, Vol.212, p.123298, Article 123298
• Main Authors: Zhong, Xinke, Song, Yihu, Zheng, Qiang, Wang, Wanjie
• Format: Article
• Language: English
• Subjects: Butadiene; Chain entanglement; Conjugation; Crosslinking; Density; Dicumyl peroxide; Entanglement; Network structure; Paraffin; Paraffins; Payne effect; Peroxide; Rheological properties; Rubber; Toluene; Vulcanizates
• ISSN: 0032-3861; 1873-2291
• DOI: 10.1016/j.polymer.2020.123298

Gum vulcanizates exhibit Payne effect and weak strain overshooting behavior, which is usually forgot in rubber industry. Herein the Payne effect of butadiene rubber (BR) vulcanizates is investigated for clarifying the effect of crosslinking density and sol content mediated by using coagent in conjugation with dicumyl peroxide. Toluene extraction and paraffin swelling of the vulcanizates are performed for clarifying the contribution of sol fraction and chains entanglement. The results show that the Payne effect and weak strain overshooting of gum vulcanizates are closely related to effective crosslinking density rather than network defects. This work is helpful for understanding the nonlinear rheological responses of the gum vulcanizates with defective network structure. [Display omitted] •Crosslinking density and sol fractions of cis-BR vulcanizates are mediated by coagent in conjugation with DCP.•Rheological parameters of gum vulcanizates are mainly determined by crosslinking density.•Payne effect of vulcanizates is originated from network strands.•Chains disentanglement is not the main cause of Payne effect.