【作者】 李靖； 白万才； 吴淑芬； 郭灿雄；

【Author】 Jing Li;Wancai Bai;Shufen Wu;Canxiong Guo;College of Science,Beijing University of Chemical Technology;

【机构】 北京化工大学理学院；

【摘要】 微孔泡沫塑料(microcellular foam,MCF)具有优异的机械和热力学等物化性能[1,2]。目前MCF的制备主要是以超临界流体为发泡剂,通过严格控制制备条件来实现[3,4]。本课题组创新的提出,将层状材料蒙脱土(MMT)通过水化、酸化及超声波辅助胶体化后,与化学发泡剂4,4’-氧代双苯磺酰肼(OBSH)复合改性,制备出高分散的OBSH/MMT纳米复合微泡塑料发泡剂。合适的洗涤方式和表面改性有助于减少颗粒的团聚,同时提高了其在聚合物中的分散性。复合发泡剂颗粒粒径约5μm,发泡剂的担载量为20%,制备出环氧树脂泡沫塑料平均泡孔直径约为30μm,泡孔密度为1.8×106个/cm3。NMR,XRD,FT-IR,SEM及TG-DTA等表征证明,OBSH嵌入MMT层间,蒙脱土层间距由1.51nm增大到1.74nm。其在限域空间中热分解行为也发生了变化。更多还原

【Abstract】 The microcellular foams(MCF) can provide better mechanical and thermal properties[1,2].The supercritical fluid(SCF) foaming agents were mainly used to prepare MCF so far[3,4] in which the high pressure and/or high temperature were usually used.Now we proposed a mechanism to obtain MCF by use of a novel highly dispersed OBSH/MMT nano-composites foaming agent via a colloid-modification process.Colloidalization and surface modification of the composites contributed not only to little agglomeration,but also to the enhancement of dispersibility in the epoxy resin.The particle size of the composites was about 5μm and the loading of OBSH was about 20%.The foams with average cell size of 30μm and a cell density of 1.8×106cell/cm3 was obtained.Characterizations suggested the intercalation of OBSH in the MMT.The basal spacing of MMT increased obviously.Thermal decomposition behavior of OBSH embedded in the confined space of MMT was also different.更多还原