牺牲键强度可调的高强韧热塑性弹性体的制备及性能研究

针对由于物理交联导致热塑性弹性体强度较低的缺点，申请人提出将三联吡啶基团引入到聚醚酯多嵌段共聚物中，利用三联吡啶与不同金属离子的配位，得到具有不同牺牲键强度的兼具物理交联和超分子交联双交联网络的高强韧热塑性弹性体。通过开环-缩合级联聚合方法，以三联吡啶环状寡聚酯为单体或三联吡啶二醇为引发剂，制备得到侧链含三联吡啶的聚醚酯多嵌段共聚物；系统研究聚合条件对多嵌段共聚物链结构的影响，研究聚合动力学，达到对多嵌段共聚物的可控制备；通过多嵌段共聚物与不同金属离子的配位络合，制备具有双交联网络的高强韧热塑性弹性体。系统研究配位交联前后的链结构、聚集态结构以及机械、自愈合和光电等性能的变化，重点研究配位键强度对弹性体性能的调控，建立相应的构效关系。研究配位交联后高温下的流变行为，制定适宜的加工条件。在上述基础上，建立通过双交联网络构筑高强韧热塑性弹性体的理论。

Thermoplastic elastomers have the shortage of low strength due to the physical crosslinking point in them. To resolve this problem, we propose a double-network strategy by introducing terpyridine ligands into poly(ether ester) multiblock elastomers, where sacrificial bonds with different strength are formed by the coordination of terpyridine with metal ions. As a result, thermoplastic elastomers with physical crosslinking and supramolecular crosslinking networks are obtained. The terpyridine-containing multiblock copolymers are obtained by the cascade polycondensation-coupling ring-opening polymerization method, using terpyridine cyclic oligoesters as monomers or terpyridine diols as co-initiators. The effect of polymerization condition on the multiblock copolymer chain structure is studied, and the polymerization kinetics are obtained to achieve the controlled preparation of multiblock copolymers. The double-network thermoplastic elastomers with high strength and toughness are obtained by reacting with different metal ions. The chain structure, crystal and micro-phase separation structure of the multiblock copolymer before and after supramolecular crosslinking are studied, in addition to the mechanical properties, the self-healing properties, and the opto-electronic properties to establish the structure-property relationship, especially the effect the strength of coordination bonds on the elastomers properties. The rheology property of elastomers after supramolecular crosslinking are studied to obtain the suitable manufactory conditions. Finally, a method is established to construct thermoplastic elastomers with high strength and toughness by forming double-network in the system.