将长链支化结构引入到主链上是调控聚合物熔体行为和固体行为的重要手段。从实验上、理论上阐明支化结构参数、主链与支链相容性与高分子材料聚集态结构和性能的多重构效关系具有重要的学术价值和实际意义。本项目通过可控聚合方法设计合成主链与支链具有可逆或不可逆化学连接点的两类结构明确的长链支化聚合物模型分子，系统研究：1）长链支化结构参数对于聚合物熔体行为和固体行为的影响规律；2）主链与支链相容性变化对于聚合物熔体行为和固体行为的影响规律；3）长链支化结构（分子量单峰分布）与线形结构（分子量双峰分布）可逆转变对于聚合物熔体行为和固体行为的影响规律。在此基础上，建立聚合物链的拓扑结构参数和链间相容性与流变性能、加工性能、聚集态结构、物理机械性能的构效关系，探索利用高分子拓扑结构的变化协同调控聚合物加工性能与物理性能的新途径，为制备高性能、高附加值聚合物提供理论依据。

The presence of long chain branched structure on polymer backbone is an important route to adjust melt behavior and solid behavior of polymers. It is valuable to illustrate complicated relationship of molecular parameters of long chain branches and miscibility between backbone chain and branch chain with solid state and properties of polymers in academic research and practical application. In this project, we first synthesize two kinds of well-defined long chain branched polymers via controllable polymerization methods, i.e. polymers with reversible or nonreversible linking between backbone chain and branch chain. Then we will systematically study: 1) effect of molecular parameters of long chain branches on melt behavior and solid behavior; 2) effect of miscibility between backbone chain and branch chain on melt behavior and solid behavior; 3) effect of reversible transformation between long chain branched structure (single MWD) and linear structure (bimodal MWD) on melt behavior and solid behavior. On this base, we attempt to establish the relationships of molecular parameters of long chain branches and miscibility between backbone chain and branch chain with rheological properties, processing properties, solid states and physical properties of polymer materials. Finally we explore to adjust synergistically processing properties and physical properties through tailoring topological structure of polymer chains, which will pave a road ro prepare high-performance and high-value polymer materials.