Zhang Huifeng, Zhang Lu, Chen Xu, Wang Yueqiong, Zhao Fuchun, Luo Mingchao, Liao Shuangquan
Key Laboratory of Advanced Materials of Tropical Island Resources, Ministry of Education, Hainan University, Haikou 570228, China.
School of Life and Pharmaceutical Science, Hainan University, Haikou 570228, China.
Polymers (Basel). 2020 Nov 30;12(12):2880. doi: 10.3390/polym12122880.
Though the non-rubber components have long been recognized to be a vital factor affecting the network of natural rubber (NR), the authentic role of non-rubber components on the network during accelerated storage has not been fully illuminated. This work attempts to clarify the impact of non-rubber components on the network for NR during accelerated storage. A natural network model for NR was proposed based on the gel content, crosslinking density, and the non-rubber components distribution for NR before and after centrifugation. Furthermore, the effect of non-rubber components on the network was investigated during accelerated storage. The results show that terminal crosslinking induced by non-rubber components and entanglements are primary factors affecting the network formation during accelerated storage. By applying the tube model to analyze the stress-strain curves of NR, we found that the contribution of the entanglements to the network formation is larger than that of terminal crosslinking during accelerated storage. The work highlights the role of non-rubber components on the network during accelerated storage, which is essential for understanding the storage hardening mechanism of NR.
尽管非橡胶成分长期以来一直被认为是影响天然橡胶（NR）网络的一个关键因素，但在加速储存过程中，非橡胶成分对网络的真实作用尚未得到充分阐明。这项工作旨在阐明加速储存过程中非橡胶成分对NR网络的影响。基于凝胶含量、交联密度以及离心前后NR的非橡胶成分分布，提出了一种NR的天然网络模型。此外，还研究了加速储存过程中非橡胶成分对网络的影响。结果表明，非橡胶成分诱导的末端交联和缠结是加速储存过程中影响网络形成的主要因素。通过应用管模型分析NR的应力-应变曲线，我们发现加速储存过程中缠结对网络形成的贡献大于末端交联。这项工作突出了加速储存过程中非橡胶成分对网络的作用，这对于理解NR的储存硬化机制至关重要。
