熟化过程中结构与组分的变化对天然橡胶性能的影响
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1.海南大学 材料科学与工程学院,海南 海口 570288;2.中国热带农业科学院农产品加工研究所/广东省天然橡胶加工重点实验室,广东 湛江 524001

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国家自然科学基金资助项目(51603230);现代农业产业技术体系建设专项资金(CARS-33-JG2);广东省天然橡胶加工重点实验室资助(2019B121203004);农业农村部热带作物产品加工重点实验室开放课题(KFKT201906)


Effect of Structural and Component Changes on Properties of Natural Rubber During Maturation
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    摘要:

    熟化是天然橡胶加工过程中的重要工序之一,过程中往往伴随着天然橡胶的结构与组分变化,从而引起天然橡胶性能的改变。但是,天然橡胶的结构和组分随着熟化的进行而同步发生改变,因此二者各自对天然橡胶性能的影响大小尚不明确。本文拟通过TSR 10、TSR 10CV 和 TSR 3CV三个样品来对比分析天然网络和非胶组分各自对NR性能的影响。结果表明熟化过程中天然网络结构的增加对门尼粘度值和塑性初值的升高有较大的贡献,而非胶组分含量的减少则对其影响较小。对于未填充天然橡胶硫化胶而言,非胶组分的分解是力学性能提高的重要来源;而天然网络结构对有效交联密度和力学性能的贡献具有一定协同效应,但贡献幅度相对有限。对于填充炭黑天然橡胶硫化胶而言,三个样品的常规力学性能无明显差异,但TSR 10的整体动态疲劳性能最优,TSR 10CV其次,TSR 3CV最差。说明非胶组分的降解和天然网络结构的存在均有利于提高填充炭黑天然橡胶硫化胶的动态力学性能。

    Abstract:

    Maturation is one of the important steps in the processing of natural rubber. The process is often accompanied by changes in the structure and components of natural rubber, resulting in changes in the properties of natural rubber. However, the structure and components of natural rubber change synchronously with the progress of maturation, so the influence of the two on the properties of natural rubber is not clear. In this paper, three samples of TSR 10, TSR 10CV and TSR 3CV were used to compare and analyze the effects of natural network and non-rubber components on the performance of NR. The results show that the increase of the natural network structure during the maturation process has a greater contribution to the increase of Mooney viscosity and initial plasticity value, while the decrease of the content of non-rubber components has less effect. For unfilled natural rubber vulcanizates, the decomposition of non-rubber components is an important source of improved mechanical properties; while the contribution of natural network structure to effective crosslink density and mechanical properties has a synergistic effect, but the contribution is relatively limited. For carbon black filled natural rubber vulcanizates, there is no significant difference in the conventional mechanical properties of the three samples, but the overall dynamic fatigue performance of TSR 10 is the best, followed by TSR 10CV and the worst of TSR 3CV. It shows that the degradation of non-rubber components and the existence of natural network structure are beneficial to improve the dynamic mechanical properties of carbon black filled natural rubber vulcanizates. s

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  • 收稿日期:2022-03-16
  • 最后修改日期:2022-04-29
  • 录用日期:2022-06-20
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