Study on synthesis and mechanical properties of molecular composites by in-situ polymerization

“分子复合材料”是近年来为了提高复合材料的力学性能而在复合材料研究中引入的一个新概念。然而，作为增强材料的刚性聚合物与作为基质的柔性聚合物的相容性通常很差，因此很难将这两种聚合物混合在一起。因此，刚性聚合物的单体被溶解在柔性聚合物溶液中，并聚合成刚性聚合物和柔性聚合物的复合材料。此外，我们的注意力集中在一对相互具有吸引力的聚合物上，以获得分子复合材料，其中两种聚合物在分子水平上是可互溶或混合的，刚性聚合物可以起到很大的增强作用。在本工作中，我们使用酸碱、氢键和电荷转移相互作用作为柔性聚合物和刚性聚合物之间的吸引相互作用，以研究它们的相容与力学性能之间的关系。以柔性聚合物和刚性聚合物之间的酸碱相互作用为吸引作用，采用原位缩聚法制备了具有良好力学性能的分子复合材料。从这些结果中可以获得有关复合材料分子设计的基本信息。

"Molecular composite" is a new concept which has recently been introduced in composite material research in order to enhance the mechanical properties of composite. However, the compatibility of rigid polymers, which are used as reinforcing materials, with flexible polymers used as matrices is usually so poor that blending of these two polymers is very difficult. Therefore, monomers of rigid polymers was disssolved in flexible polymer solution and polymerized to form composites of rigid polymers and flexible polymers. Furthermore, our attention has been focused on a pair of polymers having attractive interactions with each other in order to obtain a molecular composite, where two polymers were miscible or mixed in a molecular level and great reinforcing effect of rigid polymers could be expected.In this work, we used acid-base, hydrogen bonding and charge transfer interactions as attractive interactions between flexible polymers and rigid polymers in order to investigate the relationship between their compatibilities and their mechanical properties. When acid-base interaction between flexible polymer and rigid polymer was used as an attractive interaction, a molecular composite with good mechanical properties was prepared by in-situ polycondensation. From these results, the fundamental information regarding the molecular design of composites could be obtained.