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Insight on natural rubber’s relationship with coagulation methods and some of its properties during storage

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Abstract

The changes in the structure, such as molecular weight, crosslinking density, and gel content, could influence the stability and the processing performance of natural rubber (NR) during storage. Previous works showed that temperature and humidity influence storage performances. Here, we found different coagulation methods could also affect storage behaviors of natural rubber, since coagulation methods could affect the content of non-rubber components. In this article, natural rubber latex was coagulated by three different coagulation methods. Under storage conditions, the content of some non-rubber components, namely the gel content, Mooney viscosity, Wallace initial plasticity (\(P_{0}\)), plasticity retention index (PRI), molecular weight, tensile strength, and crosslinking density of natural rubber were compared and analyzed. The results showed that properties (PRI, Mooney viscosity, and green strength) of NR were higher than that of NR-Salt and NR-Acid after storage; at the same time, PRI, Mooney viscosity, and green strength of NR-Salt were higher than that of NR-Acid after storage. Mooney viscosity and green strength of NR-Salt and NR-Acid showed a tendency for increase in the begin and then decrease. According to the changes before and after storage, we can choose suitable coagulation methods and rubber based on what we need.

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Acknowledgements

The research was funded by the Strategic Priority Research Program of the Chinese Academy of Sciences (no. XDC06010100), Key-Area Research and Development Program of Guangdong Province (no. 2020B020217003), Major Science and Technology Plan Projects of Hainan Province (no. ZDKJ2016020) and Hainan Province Postgraduate Innovation Research Project (no. Hys2019-121).

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Authors and Affiliations

  1. Key Laboratory of Advanced Materials of Tropical Island Resources of Ministry of Education, Natural Rubber Cooperative Innovation Center of Hainan Province and Ministry of Education of PRC, School of Materials Science and Engineering, Hainan University, Haikou, 570228, China

    Xu Chen, Hui-Feng Zhang, Lu Zhang, Yan-Chan Wei, Benxiang Hu, Ming-Chao Luo & Shuangquan Liao

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  1. Xu Chen
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  2. Hui-Feng Zhang
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Correspondence to Shuangquan Liao.

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Chen, X., Zhang, HF., Zhang, L. et al. Insight on natural rubber’s relationship with coagulation methods and some of its properties during storage. J Rubber Res 24, 555–562 (2021). https://doi.org/10.1007/s42464-021-00139-y

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  • DOI: https://doi.org/10.1007/s42464-021-00139-y

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