Ding Li, Huang Honghai, Wang Yuekun, Li Jianwei, Gui Hongxing, Chen Yongping
School of Materials Science and Engineering, Hainan University, Haikou 570228, China.
Rubber Research Institute, Chinese Academy of Tropical Agricultural Science, Haikou 570101, China.
Polymers (Basel). 2024 Dec 23;16(24):3601. doi: 10.3390/polym16243601.
The coagulation of fresh latex is one of the critical processes that impacts rubber quality during natural rubber processing. Constitutive relationships are the basis for the study of the mechanical properties of rubber materials and serve as a prerequisite for material simulation studies. However, studies on the effect of different coagulation methods on natural rubber constitutive relationships have yet to be carried out, and the current models used for natural rubber constitutive relationships need to be improved. In order to investigate the effects of different coagulation methods on the hyperelastic properties of natural rubber, the impact of natural coagulation, enzyme coagulation, acid coagulation, microbial coagulation, and enzyme-assisted microbial coagulation on the hyperelastic constitutive relationship of natural rubber were analyzed in detail based on tensile experiments and the Yeoh model. The results show that after introducing a strain rate-related factor, the Yeoh model can describe well the mechanical behavior of natural rubber carbon black composites in different deformation regions, and the rubber, studied with varying coagulation methods, exhibits different mechanical properties in different deformation regions. This study provides new evidence for the study of high-performance natural rubber and serves as a reference for process selection in the primary processing of natural rubber.
新鲜胶乳的凝固是天然橡胶加工过程中影响橡胶质量的关键工序之一。本构关系是研究橡胶材料力学性能的基础，也是材料模拟研究的前提条件。然而，目前尚未开展不同凝固方法对天然橡胶本构关系影响的研究，现有的天然橡胶本构关系模型有待改进。为了研究不同凝固方法对天然橡胶超弹性性能的影响，基于拉伸实验和Yeoh模型，详细分析了自然凝固、酶凝固、酸凝固、微生物凝固以及酶辅助微生物凝固对天然橡胶超弹性本构关系的影响。结果表明，引入与应变率相关的因子后，Yeoh模型能够很好地描述天然橡胶炭黑复合材料在不同变形区域的力学行为，且采用不同凝固方法制备的橡胶在不同变形区域表现出不同的力学性能。该研究为高性能天然橡胶的研究提供了新的依据，也为天然橡胶初加工过程中的工艺选择提供了参考。
