【作者】 董薇；

【导师】 张勇；

【作者基本信息】 上海交通大学 ， 材料学， 2007， 硕士

【摘要】 本文研究了不同的蒙脱土(MMT)与顺丁橡胶(BR)基体之间的相互作用以及制备过程中复合材料结构的变化过程和不同的材料结构所引起的性能差异。论文选取了四种填料进行了比较,即钠基蒙脱土(Na-MMT)、十八烷基氯化铵改性的有机蒙脱土(DK1N)、二甲基双氢化牛脂基氯化铵改性的有机蒙脱土(DK4)以及炭黑。使用了硫磺(S)和过氧化二异丙苯(DCP)两种硫化体系。将填料与橡胶材料进行复合后,对其硫化特性,力学性能,以及交联密度进行了测试,同时通过X射线衍射,示差扫描量热仪测试,热重分析,表面能测试和扫描电子显微镜等表征手段对复合材料的结构进行了表征分析。结果表明,DK4和炭黑对顺丁橡胶的补强效果最佳,Na-MMT基本没有补强作用。此外在加工过程中,与DCP硫化体系相比,S硫化体系有利于有机蒙脱土插层过程的进行,但同时也降低了BR/MMT复合材料的交联密度。加工过程能够显著影响DK1N在基体中的分散情况,使得该蒙脱土片层间距逐步增大。与BR相比,BR/MMT复合体系的结晶度有所降低,而结晶温度提高。BR/DK1N体系的结晶峰和熔融峰温度均高于BR/DK4体系。在S硫化体系中,与BR相比,BR/MMT复合体系的交联密度较低,尤其是DK1N补强体系,而在DCP硫化体系中,加入蒙脱土后交联密度均有上升。加入有机蒙脱土后,复合材料的热老化性能明显提高,其中以BR/DK1N复合材料的提高最为显著。场发射扫描电镜的结果显示,BR与DK1N复合后,有机蒙脱土的片层有明显的堆砌和聚集,少量的片层分布在橡胶基体中,呈插层结构。在BR/DK4复合材料中,相畴变得细化,可以更多还原

【Abstract】 In this dissertation the interactions of butadiene rubber with different kinds of montmorillonite and were studied. Structure of BR compounds under different processing conditions and properties of resulting composites were investigated.Pristine Montmorillonite (Na-MMT), organo-montmorillonite modified with octadecyl ammonium chloride (DK1N), organo-montmorillonite modified with dimethyl dehydrogenate tallow ammonium chloride (DK4) and carbon black were used to reinforce BR and the structure and properties of resulting composites were compared. A sulphur curing system and peroxide curing system were used for comparison. The curing characteristics, mechanical properties, and crosslink density of the result composites were studied. X-ray diffraction, differential scanning calorimeter, thermo gravimetric analyzer, field emission scanning electron microscopy and surface energy tests were carried out to analyze the structure of result composites. It was found that DK4 and carbon black were more effective reinforcing agents. Na-MMT showed little reinforcement effect. In the processing procedure, OMMT layers were easier to be intercalated by BR chains in the sulphur curing system than in the peroxide curing system, however, resulting in fractional restricted layers and lowered crosslink density. Processing course remarkably influenced the dispersion of DK1N in更多还原