发布时间：2015-01-15 来源：人大经济论坛

化工专业论文范文 目 录 中文摘要I 英文摘要II 目 录III 1 绪论1 2 实验部分8 2.1 实验原料8 2.2 梯度共聚物水溶液的制备9 2.3 梯度共聚物膜的制备9 2.3 表征方法10 3 结果与讨论11 3.1 梯度共聚物水溶液的性能11 3.2 梯度共聚物热性能14 3.3 梯度共聚物膜的表面形貌16 4 结论17 致 谢18 参考文献19 摘要：梯度共聚物是一类新型的聚合物材料，其沿链长方向组成呈梯度渐变，组成分布介于无规共聚物和嵌段共聚物之间。随着活性自由基聚合技术的发展，梯度共聚物才逐渐被关注。梯度共聚物被认为是一类潜在的功能性材料，可以用作阻尼材料、相容剂、表面活性剂等。理论和实验都证明组成梯度是一个可以调控聚合物纳微米形貌的链结构参数，因此它对实现聚合物材料的高性能十分重要。本文以甲基丙烯酸(MAA)/甲基丙烯酸甲酯(MMA)梯度共聚物(Poly(MAA-grad-MMA))为模型聚合物，采用组成为无规分布的共聚物(Poly(MAA-uni-MMA))、组成梯度为线性的共聚物(Poly(MAA-li-MMA))、中间段为线性梯度的三嵌段共聚物(Poly(MAA-tri-MMA))以及二嵌段共聚物(Poly(MAA-di-MMA))四种梯度共聚物，系统地研究了组成分布对Poly(MAA-grad-MMA)水溶液的性能、Poly(MAA-grad-MMA)的热性能以及Poly(MAA-grad-MMA)膜的表面形貌。 关键词：MAA/MMA梯度共聚物；组成分布；溶液性能；热性能；表面形貌 英文摘要 Abstract: Gradient copolymers, of which the chemical compositions change along chain backbones, can be synthesized only via living polymerization processes. As a novel type of copolymers, synthesis of gradient copolymers and eva luation of their materials properties have received increasing interest recently. Gradient copolymers are potential to be used as damping materials, compatibilizer, etc. Both theoretical and experimental investigations suggested that the composition profiles along chains be an important microstructural parameter for fine-tuning nano-morphologies, and thus physical and functional properties of polymer materials. We used four kinds of methacrylic acid(MAA)/methyl methacrylate(MMA) gradient copolymers, involving uniform MAA/MMA copolymer(Poly(MAA-uni-MMA)), linear MAA/MMA copolymer(Poly(MAA-li-MMA)), triblock MAA/MMA copolymer with a linear gradient mid-block(Poly(MAA-tri-MMA)) and diblock MAA/MMA copolymer (Poly(MAA-di-MMA)), to systematically investigate the influence of composition profiles on their chemical and physical properties in solution, in bulk and in form of film. Keywords: MAA/MMA gradient copolymer; Composition profiles;Solution property; Thermal property; Film property