静电自组装制备交联聚苯乙烯纳米微球/石墨烯杂化填料(PS@rGO)及其在丁苯橡胶中的应用研究  

Preparation of Crosslinked Polystyrene Nanoparticles/Reduced Graphene Oxide Hybrids Using Electrostatic Self-assembly and Their Application in SBR

作　　者：陈耀燃 林勇[1] 陈义中[1] 张颖[1] 刘岚[1] 

机构地区：[1]华南理工大学材料科学与工程学院,广州510640

出　　处：《高分子学报》2016年第12期1724-1734,共11页Acta Polymerica Sinica

基　　金：国家重点基础研究发展计划(973计划;项目号2015CB654700(2015654703));国家自然基金(基金号51573053);广东省科技计划项目(项目号2014A010105022)资助

摘　　要：以十六烷基三甲基溴化铵（CTAB）为乳化剂,合成了交联聚苯乙烯纳米微球（PS）阳离子乳液;通过静电自组装以及原位还原制得了交联聚苯乙烯纳米微球/石墨烯杂化填料（PS@rGO）;将杂化填料与丁苯橡胶共混,制备了SBR/PS@rGO纳米复合材料.X-射线衍射（XRD）、红外光谱（FTIR）、拉曼光谱（Raman）和热重分析（TGA）证实了PS@rGO中rGO有效地得到还原并与PS存在着很强的π-π相互作用;扫描电子显微镜（SEM）测试结果表明,PS@rGO中PS纳米微球的粒径约为60～70 nm,并均匀地吸附在r GO表面,有效地阻止了r GO堆叠.SBR/PS@rGO纳米复合材料硫化性能研究表明,PS@rGO能大大缩短胶料的正硫化时间,增大交联密度;SEM,RPA和Mooney-Rivlin模拟等证明了,杂化填料在SBR基体中分散均匀,并搭接形成了更完善的填料网络结构,具有较强的界面相互作用,使得复合材料的力学性能和耐磨性能有较大的提高,很好地实现了补强.与添加同等30份的沉淀法SiO_2相比,SBR/PS@rGO纳米复合材料不仅具有更优异的机械性能,而且具有更低的密度,有望在轮胎等橡胶制品中应用,以降低驱动能耗、节省能源.Positively charged crosslinked polystyrene（PS） nanoparticles were first synthesized by emulsion polymerization using CTAB as emulsifier,and crosslinked PS nanoparticles/reduced graphene oxide hybrids（PS@rGO） were fabricated by electrostatic self-assembly,accompanied with in situ reduction. The obtained PS@rGO hybrids were incorporated into SBR matrix to fabricate SBR/PS@rGO composites. The structure and morphology of the composites were investigated. The results showed that GO was efficiently reduced by in situ reduction,and the obtained reduced graphene oxide（r GO） exhibited strong π-π interactions with PS nanoparticles. PS particles with their size of 60 ～ 70 nm were uniformly adsorbed onto the surface of r GO sheets,which effectively prevented r GO sheets from re-stack and aggregation. Then vulcanization performance tests further indicated that the inclusion of PS@rGO hybrids not only shortened the curing time（Tc90） by accelerating the vulcanization rate（CRI）,but also improved the total crosslinking density of the composites.When 30 phr PS@rGO were introduced into SBR,the CRI was enhanced by 67. 07%. And as expected,the morphology and performance analysis,and Mooney-Rivlin equation further demonstrated that PS@rGO hybrids were preferably dispersed in the matrix because of the synergistic effect resulted from PS and r GO,forming a3 D hybrid filler network in the rubber matrix. Also,it was reasonably concluded that the PS served as bridges connecting SBR matrix and r GO,resulting in strong interfacial interactions between PS@rGO and the rubber matrix. Thus,the improved filler dispersion and enhanced interfacial interactions greatly improved the mechanical performance and abrasion resistance of the SBR composites. For example,SBR/PS@rGO composites with a lower density exhibited higher mechanical performance and abrasion resistance in comparison with the SiO_2 filled composites. These enhanced performances significantly conduce to reducing energy consumption under the dynamic condition,whic

关 键 词：交联聚苯乙烯纳米微球 氧化石墨烯 静电自组装 PS@rGO 丁二苯-苯乙烯橡胶 

分 类 号：TQ333.1[化学工程—橡胶工业] TB332[一般工业技术—材料科学与工程]