The Effect of the Fresh Latex Ratio on the Composition and Properties of Bio-Coagulated Natural Rubber

作者：Jianwei Li, Honghai Huang, Li Ding, Tuo Dai, Haoran Geng, Tao Zhao, Liguang Zhao, Fan Wu, Hongxing Gui · 发表于：Polymers · 年份：2025 · DOI：10.3390/polym17162211 · 被引用次数：6 · 研究领域：Polymer Nanocomposites and Properties、biodegradable polymer synthesis and properties、Lignin and Wood Chemistry

By proportionally blending fresh latex from PR107, Reyan 72059, and Reyan 73397, and employing both acid- and enzyme-assisted microbial coagulation methods, this study analyzed the effects of the specific latex formulation on the following: physicochemical properties, non-rubber components, molecular weight and distribution, vulcanization characteristics of compounded rubber, and physical–mechanical properties of vulcanized natural rubber. The results indicate that, compared to acid-coagulated natural rubber, enzyme-assisted microbial coagulated natural rubber exhibits slightly lower levels of volatile matter, impurities, plasticity retention index (PRI), nitrogen content, calcium ions (Ca2+), iron ions (Fe3+), and fatty acid content. Conversely, it demonstrates higher values in ash content, initial plasticity (P0), Mooney viscosity (ML(1+4)), acetone extract, magnesium ions (Mg2+), copper ions (Cu2+), manganese ions (Mn2+), gel content, molecular weight and distribution, and glass transition temperature (Tg). With the increase in the proportion of PR107 and Reyan 72059 fresh latex, the ash content, volatile matter content, fatty acid content, gel content, and dispersion coefficient (PDI) of natural rubber gradually decrease, while the impurity content, PRI, nitrogen content, weight-average molecular weight (Mw), and number-average molecular weight (Mn) gradually increase. Compared to acid-coagulated natural rubber compounds, enzyme-assisted microbial-coagulated natural rubbe...