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Quantitative Analysis of Abnormal Groups on Molecular Chain of Natural Rubber

  • NATURAL POLYMERS
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Abstract

Natural rubber (NR) with unique molecular chain structure has excellent mechanical properties to synthetic high cis-1,4-polyisoprene. In previous studies, structural analysis of the terminal units of NR has been reported. However, there are few researches about the abnormal groups on molecular chain of NR, which also play a crucial role in determining physiochemical of NR. In this study, abnormal groups on molecular chain of NR are quantified by 1H nuclear magnetic resonance spectrometer (1H NMR) and Fourier transform infrared spectrometer (FTIR) after enzymes treatment and nitrogen atom labeling method. The results show that the content of epoxide group is 0.63% (w/w), hydroxyl is 0.04% (w/w), aldehyde groups is 0.11% (w/w), carboxyl groups is 0.01% (w/w), and 3,4 isoprene is 0.33% (w/w). Meanwhile, the variation tendency of content of abnormal groups is investigated during the storing. Accordingly, a model of molecular chain of NR is proposed, which can provide more insightful understanding toward the structure-property relationship of NR.

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Funding

This work was financially supported by the National Natural Science Foundation of China (no. 51363006), Special Fund for Agro-scientific Research in the Public Interest (no. 201403066) and Major Science and Technology Plan Projects of Hainan Province (ZDKJ2016020-02).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Hainan University, 570228, Haikou, China

    Yanchan Wei, Linhe Jin, Huifeng Zhang & Shuangquan Liao

  2. China Hainan Rubber Industry Group Co., LTD, 570105, Haikou, China

    Aiwu Ding

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  1. Yanchan Wei
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  2. Aiwu Ding
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  3. Linhe Jin
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  4. Huifeng Zhang
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  5. Shuangquan Liao
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Correspondence to Shuangquan Liao.

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Yanchan Wei, Ding, A., Jin, L. et al. Quantitative Analysis of Abnormal Groups on Molecular Chain of Natural Rubber. Polym. Sci. Ser. B 61, 856–864 (2019). https://doi.org/10.1134/S1560090419070030

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  • DOI: https://doi.org/10.1134/S1560090419070030

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