探索环氧官能化聚硫化物作为二氧化硅填充橡胶复合材料的无VOC、高效界面改性剂,Macromolecules

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探索环氧官能化聚硫化物作为二氧化硅填充橡胶复合材料的无VOC、高效界面改性剂
Macromolecules ( IF 5.1 ) Pub Date : 2024-01-08 , DOI: 10.1021/acs.macromol.3c01972
Dong Wang ₁ , Jialiang Chen ₁ , Zhenghai Tang ₁ , Ruoyan Huang ₁ , Yilin Xiao ₁ , Jiadong Chen ₂ , Panchao Yin ₂ , Baochun Guo ₁ , Liqun Zhang _{1,

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白炭黑填充橡胶复合材料是具有高燃油经济性的“绿色轮胎”的主要组成部分。如今，加入含硫硅烷偶联剂（SSCA）来改善二氧化硅和橡胶之间的相容性对于优化所得复合材料的综合性能至关重要。然而，SSCA的合成需要多步程序和有机溶剂，并且许多棘手的问题，例如改性效率低和挥发性有机化合物（VOC）排放，在SSCA的使用中无法解决。在此，我们提出了通过苯乙烯、1,2-环氧-4-乙烯基环己烷和硫的反硫化轻松合成环氧工程聚硫化物（SPVE），并将其用作二氧化硅填充橡胶复合材料的新型改性剂。揭示了SPVE的耦合机制。具体来说，SPVE的多硫化物可以接枝到橡胶链上；同时，SPVE的环氧基团很容易与二氧化硅表面上的硅烷醇基团发生反应，在橡胶和二氧化硅之间形成分子键。因此，掺入 SPVE 显着改善了二氧化硅的分散性并增强了复合材料的界面粘附力，从而导致优异的机械性能并显着降低了滞后损失。与常用的SSCA双[3-(三乙氧基硅基)丙基]四硫化物相比，SPVE表现出更高的偶联效率，且无VOC排放，为节能轮胎的制造提供了环保的解决方案。

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Exploring Epoxy-Functionalized Polysulfide as a VOC-Free and Highly Effective Interfacial Modifier for Silica-Filled Rubber Composites

Silica-filled rubber composite is the main component of the “green tire” featured with a high fuel economy. Nowadays, incorporating sulfur-containing silane coupling agents (SSCAs) to improve the compatibility between silica and rubber is essential to optimizing the comprehensive properties of the resultant composites. However, SSCA synthesis requires multistep procedures and organic solvents and many intractable issues, such as low modification efficiency and volatile organic compound (VOC) emissions, cannot be resolved with regard to the use of SSCAs. Herein, we presented the facile synthesis of an epoxy-engineered polysulfide (SPVE) via inverse vulcanization of styrene, 1,2-epoxy-4-vinylcyclohexane, and sulfur and utilized it as a new-brand modifier for silica-filled rubber composite. The coupling mechanism of SPVE is revealed. Specifically, the polysulfides of SPVE can graft onto rubber chains; meanwhile, the epoxy groups of SPVE readily react with silanol groups on the silica surface, creating molecular linkages between rubber and silica. Consequently, incorporating SPVE remarkably improves silica dispersion and enhances the interfacial adhesion of the composites, thereby leading to superior mechanical properties and significantly decreased hysteresis loss. Compared with the commonly used SSCA, bis[3-(triethoxysilyl)propyl] tetrasulfide, SPVE exhibits a higher coupling efficiency without VOC emissions, providing an environmentally friendly solution for the manufacture of energy-saving tires.

更新日期：2024-01-08

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