【摘要】 采用自由基原位悬浮聚合方法,由苯乙烯/纳米无机粒子(NIP)聚合制备聚苯乙烯纳米复合材料(PSNC),再以戊烷为发泡剂制备了可发性聚苯乙烯纳米复合材料(EPSNC),筛选了NIP改性剂的种类。利用凝胶渗透色谱仪和热重分析仪对EPSNC进行表征,研究了EPSNC的分子结构和热性能,采用扫描电子显微镜对EPSNC泡体内部微观形貌进行表征,研究NIP含量对其泡体微观形貌的影响规律。结果表明,以钛酸酯偶联剂改性NIP(M-NIP)聚合产率最高;M-NIP用量在一定范围内对EPSNC的相对分子质量影响不大,但相对分子质量分布变窄;含有M-NIP的EPSNC的热稳定性明显提高;EPSNC发泡时NIP起成核作用,M-NIP能够均匀地分散在EPSNC中,其泡孔堆积有序,细密一致,且多为闭孔结构。更多还原

【Abstract】 Based on in situ radical suspension polymerization,polystyrene nanocomposites were prepared from styrene and nano-inorganic particle.Then,hexane was added to prepare expandable polystyrene nanocomposites(EPSNC).EPSNC were characterized by means of gel permeation chromatography,thermo gravimetric analyzer,and scanning electron microscope.It showed that at a suitable content of nano-inorganic particle,the molecular weight of EPSNC had a narrower distribution,the thermal stability of EPSNC was improved significantly.In addition,the nano-inorganic particle showed a nucleation function in the foaming process.The nano-inorganic particle dispersed finely in polystyrene,resulting in small and uniform closed-cell structure.更多还原