Synthesis and Bond-Dynamics of Pseudo-BlockCopolymers

目前的建议涉及微相分离的伪嵌段共聚物的产生，专注于它们在固态下的动态行为，并对自修复材料的产生具有长期的前景。与在不混溶聚合物之间的嵌段共聚物中通常使用的共价键相反，氢键系统（施加范围从Kassn ~ 25 M-1至~ 100，000 M-1的结合强度，因此显示范围从~0.01 s-1至~100 s-1的形成/再形成动力学谱）将被用于充当不混溶遥爪聚合物之间的吸引力。几种聚合物（（PIB/PNB; PIB/PDMS）（聚合物-缩写：聚异丁烯（PIB）;聚（三烯）（PNB）;聚（二甲基硅氧烷）（PDMS）），其在5000 g mol-1至~ 25，000 g mol-1的分子量范围内显示不同的热转变温度（Tg）和Flory-Huggins相互作用参数（Tg），以研究由此产生的物质系统的动力学。动态力学测量，小角X射线散射（SAXS），原位流变SAXS和固态NMR光谱将用于获得有关单个聚合物链的流动性和它们之间作为分子“胶水”的氢键的性质的信息。

The current proposal deals with the generation of microphase separated pseudoblockcopolymers, focusing on their dynamic behavior in the solid state, with a long-term perspective on the generation of self-healing materials. In contrast to the normally used covalent bond in blockcopolymers between immiscible polymers, hydrogen bonding systems (exerting binding strength ranging from Kassn ~ 25 M-1 till ~100,000 M-1, thus displaying a kinetic spectrum of formation/reformation ranging from ~0.01 s-1 to ~100 s-1) will be used to act as attractive force between immiscible, telechelic polymers. Several polymers ((PIB/PNB; PIB/PDMS) (polymer-abbreviations: polyisobutylene (PIB); poly(norbornene) (PNB); poly(dimethylsiloxane) (PDMS)), which display different thermal transition-temperatures (Tg) and Flory-Huggins interaction parameters () in the molecular-weight-range from 5000 g mol-1 to ~25,000 g mol-1) will be investigated, in order to study the dynamics of the resulting material-system. Dynamic-mechanical measurements, small angle x-ray scattering (SAXS), in-situ-Rheo-SAXS and solid-state NMR-spectroscopy will be used to gain information on the mobility of individual polymer chains and the nature of the hydrogen-bonds acting as molecular “glue” between them.