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New insight into naturally occurring network and entanglements induced strain behavior of vulcanized natural rubber

文献类型： 外文期刊

作者： Wang, Yueqiong 1 ; Liu, Hongchao 2 ; Yu, Heping 2 ; Zhao, Pengfei 2 ; Wang, Qifang 2 ; Liao, Lusheng 2 ; Luo, Mingchao 1 ; Zheng, Tingting 1 ; Liao, Shuangquan 1 ; Peng, Zheng 2 ;

作者机构： 1.Hainan Univ, Sch Mat Sci & Engn, Key Lab Adv Mat Trop Isl Resources, Minist Educ, Hainan 570228, Peoples R China

2.Chinese Acad Trop Agr Sci, Agr Prod Proc Res Inst, Guangdong Prov Key Lab Nat Rubber Proc, Guangdong 524001, Peoples R China

关键词： Vulcanized natural rubber; Crystallization; Entanglements; Naturally occurring network

期刊名称：POLYMER （ 影响因子：4.432； 五年影响因子：4.161 ）

ISSN： 0032-3861

年卷期： 2022 年 241 卷

页码：

收录情况： SCI

摘要： Vulcanized natural rubber (NR) with different naturally occurring network and entanglements were prepared by film formation and mechanical mixing methods, and the influences of naturally occurring network and entanglements on stress-strain relation and stain-induced crystallization (SIC) was analyzed by tensile testing machine and in-situ synchrotron wide-angle X-ray diffraction. It was found that there were three types of networks in vulcanized NR, i.e. sulfur crosslinked network, naturally occurring network and entanglements. While mechanical mixing samples had more naturally occurring network leading to higher effective crosslink densities, film forming samples had higher degree of entanglements that facilitate to generate strain-induced crystallization (SIC) and enhance the crystallinity. Entanglements could move quickly and act as pivotal points to align rubber chains, and demonstrate more improvement in mechanical properties. Compared to mechanical mixing samples, tensile strength and elongation at break of film forming samples maximum increased by 55.5% and 20.7%, respectively. This work unveiled the important role of entanglements existed in NR gum, which may give advice on how to protect entanglements in NR gum, thus fabricating high performance vulcanized NR.

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