【作者】 郑仰才；

【导师】 王玉荣； 廖明义；

【作者基本信息】 大连理工大学 ， 材料学， 2007， 硕士

【摘要】 苯乙烯—丁二烯—苯乙烯(SBS)三嵌段聚合物是目前世界上产量最大的热塑性弹性体之一，常温下具有橡胶的弹性，高温下熔融成可塑性的材料。因其具有优良的拉伸性能、良好的耐低温性、透气性、溶解性及独特的抗滑性而被大量应用于制鞋、塑料改性、沥青改性等领域。由于SBS极性小和耐油性较差，使其运用受到限制。通过官能化可以在SBS链上引入极性基团，极大地提高了SBS的耐热，耐氧化，粘接性能及吸水性能。本文根据活性阴离子聚合分子结构可控原理，采用原位聚合法直接将官能化基团引入到SBS分子链的末端，赋予SBS功能化，这对扩大SBS的使用范围特别是改善与沥青的相容性和储存稳定性无疑是一种更为直接有效的方法。本文以环己烷为溶剂、THF为极性调节剂，首次采用对N，N-二甲基氨基苯甲醛缩苯胺、对N，N-二甲基氨基苯甲醛缩对甲基苯胺、苯甲醛缩苯胺、苯甲醛缩对甲基苯胺为官能化封端剂制备了系列官能化SBS；并研究了四种官能化封端剂与聚苯乙烯模型聚合物的反应活性，采用核磁、末端官能度滴定两种方法验证了聚合物末端官能团的存在。对末端官能化反应的工艺条件进行了考察，确定了封端反应的最佳条件。力学性能测试表明官能化聚合物的物理机械性能变化不大。采用TEM和DMA测试了上述末端基团对SBS形态和动态力学性能的影响，结果表明SBS链端封上极性基团后聚苯乙烯微核略变得松散无规，SBS的两个玻璃化转变温度、储能模量和损耗模量均变化不大。测试了新型氨基官能化SBS改性沥青的热储存稳定性。常规性能、离析度及荧光显微镜分析均表明末端氨基官能化能有效提高SBS与沥青相容性和热储存稳定性。四种西弗碱制备的官能化SBS在改性沥青方面效果相当。更多还原

【Abstract】 Styrene-butadiene-styrene(SBS) triblock copolymer is currently one of the biggestthermoplastic elastomer in the world. Under normol temperature it has elasticity as rubber andplasticity as plastic under high temperature. Because it possesses good tensile properties,moisture resistance, gas permeation, solubility and antiskid properties, and thus it is widelyused in rubber product, adhesives and modifier of asphalt. However, its disadvantages arepoor oil resistance, incompatible with polar substance. These restrict its application morewidely. Its heat resistance, antioxidantance, adhesive performances and water absorption canbe enhanced obviously by functionalization. According to the principle of anioicpolymerization and controllable structure, functionalized group is attachend to the end of SBSby in-situ technology, which is more efficient to enlarge its range of use and especiallyimprove the compalibility and stablility of SBS and asphalt blends.In this study, cyclohexane is used as solvent, THF is used as polar modifier,N,N-dimethyl-4-(phenylimino-methyl)-aniline, N-(4-dimethylamino-benzylidene)-p-toluidine,Benzylidene-aniline and N-benzylidene-4-methyl-aniline are used as functionalized agents forthe first time to synthesize funtionalized SBS. The reactivity between the four functionalizedagents and poly(stryl)lithium is investigated, and the existence of end amino group isindicated by ~1HNMR spectrums and non-aqueous titration. After investigation of the reactiontechnologcial conditions, the optimum condition is fixed. The mechanical properties of SBSbefore and after functionalized are slightly changed. The conformation and dynamicalmechanical properties of functionalized SBS are studied by TEM and DMA. Results suggestthat the attachment of end groups make the core of polystyrene random, the Tg of PS and PBchange slightly. So do storage modulus and loss modulus.The end groups on the improvement of stability of SBS modified asphalt are studied.The storage stability, physical properties, high temperature segaration and flurescencemiceoscopy suggeste that amino group can improve the compability and storage stability ofSBS modified asphalt effectively. The four functionalized SBS are equivalent on theperformance of modified asphalt.更多还原