Chen Lijuan, Guo Xiaohui, Luo Yuanfang, Jia Zhixin, Chen Yongjun, Jia Demin
Key Lab of Guangdong High Property and Functional Macromolecular Materials, Department of Polymer Materials and Engineering, South China University of Technology, Guangzhou 510640, China.
Guangdong Provincial Key Laboratory of Functional Soft Condensed Matter, Department of Polymeric Material and Engineering, School of Materials and Energy, Guangdong University of Technology, Guangzhou 510006, China.
Polymers (Basel). 2018 Oct 12;10(10):1138. doi: 10.3390/polym10101138.
Improving the interfacial interaction between rubber and silica nanoparticles, and simultaneously reducing free sulfur and preventing migration and volatilization of a rubber vulcanizing agent, commercial sulfur compound aliphatic ether polysulfide (VA-7) was chemically attached to the silica surface to obtain a functionalized nanoparticle (silica-s-VA7). Functional nanoparticles can not only effectively crosslink rubber without sulfur as a novel vulcanizator, but are also evenly dispersed in the rubber matrix and improve the dispersion of the remaining pristine silica as an interfacial compatibilizer. In addition, the thicker immobilized polymer layer and prominent crosslinking density of SBR nanocomposites simultaneously demonstrate that the novel vulcanizing agent silica-s-VA7 gives rise to significant improvement on the rubber⁻filler interfacial adhesion on account of the covalent linkages of organic and inorganic interfaces between elastomer and nanofillers. We envisage that this strategy may provide a new avenue to implement high-efficiency design for a multifunctional rubber-vulcanizing agent through an organic and inorganic hybridization mechanism.
为了改善橡胶与二氧化硅纳米粒子之间的界面相互作用，同时减少游离硫并防止橡胶硫化剂的迁移和挥发，将商业硫化合物脂肪族醚多硫化物（VA-7）化学连接到二氧化硅表面，以获得功能化纳米粒子（二氧化硅-s-VA7）。功能化纳米粒子不仅可以作为一种新型硫化剂在无硫的情况下有效地交联橡胶，而且还能均匀地分散在橡胶基体中，并作为界面增容剂改善剩余原始二氧化硅的分散性。此外，丁苯橡胶纳米复合材料较厚的固定聚合物层和显著的交联密度同时表明，由于弹性体与纳米填料之间有机和无机界面的共价键合，新型硫化剂二氧化硅-s-VA7使橡胶-填料界面粘合性得到显著改善。我们设想，该策略可能通过有机-无机杂化机制为多功能橡胶硫化剂的高效设计提供一条新途径。
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