Polyolefin Architecture Designed by Li+-catalysed Polymerization

通常，聚烯烃是通过在悬浮液中或在气相中使用聚烯烃或齐格勒型催化剂聚合而产生的。通过这种方法，仅可获得不同类型烯烃的均聚物或共聚物。在本项目中，最近发现的Li+催化的烯烃自由基聚合被提出用于获得烯烃与极性共聚单体的无规和嵌段共聚物。聚合技术和催化剂的发展，使复杂的聚合物结构，如两亲性共聚物和核壳粒子的形成，将是一个中心主题。虽然核-壳颗粒将通过非水乳液聚合获得，但嵌段共聚物将通过使用受控自由基聚合（例如ATRP、NMRP或RAFT）产生。详细的动力学研究将进行支持的合成努力，并阐明新的烯烃聚合技术。

Commonly, polyoleflns are generated via polymerization in suspension or in the gas phase employing metallocenes or Ziegler-type catalysts. By this approach, only homopolymers or copolymers of different types of olefins are accessible. In the present project, the recently discovered Li+-catalysed radical polymerization of olefins is proposed for obtaining random and block copolymers of olefins with polar comonomers. The development of polymerization techniques and catalysts that allow the formation of complex polymer architectures, such as amphiphilic copolymers and core-shell particles, will be a central theme. While core-shell particles will be obtained via non-aqueous emulsion polymerization, the block copolymers will be generated by usage of controlled radical polymerizations, such as ATRP, NMRP or RAFT. Detailed kinetic investigations will be performed to support the synthetic efforts and to elucidate the new polymerization technique of olefms.