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

“分子复合材料”是近年来在复合材料研究中引入的一个新概念，其目的是提高复合材料的力学性能。然而，用作增强材料的刚性聚合物与用作基质的柔性聚合物的相容性通常很差，使得这两种聚合物的共混非常困难。因此，刚性聚合物的单体溶解在柔性聚合物溶液中并聚合形成刚性聚合物和柔性聚合物的复合材料。此外，我们的注意力一直集中在一对聚合物具有相互吸引的相互作用，以获得分子复合材料，其中两个聚合物是可混溶或混合在分子水平上，可以预期的刚性聚合物的巨大增强效果。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力相互作用，以研究它们的相容性和它们的机械性能。以柔性聚合物与刚性聚合物之间的酸碱相互作用为吸引作用，通过原位缩聚反应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的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.