【作者】 汪佳凤；

【导师】 徐洪耀；

【作者基本信息】 安徽大学 ， 高分子化学与物理， 2005， 硕士

【摘要】 本论文通过自由基聚合方法合成了系列POSS基高分子材料,采用FTIR、¹H-NMR、²⁹Si-NMR和UV等方法对它们的结构进行了表征,并详细探讨了聚合物的结构与性能之间的关系。主要研究内容如下: 1.详细综述了POSS单体的合成、POSS基高分子材料的制备方法及结构对性能的影响。 2.利用八乙烯基POSS分别与苯乙烯（St）、甲基丙烯酸甲酯（MMA）、对乙酯基苯乙烯（AS）、对羟基苯乙烯（HS）以及乙烯基吡咯烷酮（VP）等进行共聚,制备了五个系列的POSS基高分子材料。 3.分别采用FTIR、¹H-NMR、²⁹Si-NMR和UV等方法对五个系列POSS基高分子材料进行了表征,证实POSS已与共聚单体发生了聚合反应;并通过红外标准曲线和紫外标准曲线以及核磁积分面积对共聚物中POSS的含量进行了计算,发现可以通过投料比来控制共聚物的组成。 4.通过对¹H-NMR谱的计算,POSS分子中约有5-8双键参与了聚合,并初步认为PS-POSS、PMMA-POSS、PAS-POSS和PHS-POSS系列聚合物主要以星型结构为主,而PVP-POSS聚合物主要以网络结构为主。 5.采用DSC、TGA等测试手段研究POSS基团对材料热性能的影响,并从纳米效应、偶极作用、氢键作用和物理聚集作用等方面探讨了POSS对材料热性能的影响机制,同时发现星型结构和网络结构的POSS基高分子材料有着比线性结构的POSS基高分子材料更为优越的热性能。更多还原

【Abstract】 A series of polyhedral oligomeric silsesquioxane （POSS）-based hybrids were prepared by the conventional free radical polymerization technique. Their structures were characterized and the relationship between structure and properties were discussed in detail. The main contents of this thesis include the following points:1. The synthesis of POSS monomers, the preparation method of POSS-based hybrids and the relationship between structure and properties were reviewed in detail.2. A series of POSS-based hybrids were prepared by the copolymerization reactions between the octa-vinyl polyhedral oligomeric silsesquioxane monomers and comonomers such as Styrene, Methyl methacrylate, Acetoxystyrene, Hydroxystyrene and Vinylpyrrolidone.3. The POSS-based hybrids were characterized by FTIR, ¹H-NMR, ²⁹Si-NMR and UV. The POSS content in the hybrids were determined using three kinds of different methods and could be effectively controlled by varying the POSS feed ratio.4. It was estimated that about 5⁸ vinyl groups in POSS participated in the copolymerization reactions by the ¹H-NMR spectra. And it was supposed that PS-POSS, PMMA-POSS、 PAS-POSS and PHS-POSS polymers mainly formed star-structured materials, while PVP-POSS polymer mainly possessed net-work structure.5. The thermal properties of POSS-based hybrids were characterized by DSC aind TGA. The enhancement mechanisms of their thermal properties were discussed, such as nanoeffect, dipole-dipole interaction, hydrogen bonding interaction and physical aggregation and so on. It was found that star-structure and network-structure POSS-based polymers had superior thermal properties than linear POSS-based polymers.更多还原