合金化可控烯烃多相共聚

Hetero-phasic α-olefin copolymerization is the technical basis of high-impact polypropylene and polyolefin thermoplastic elastomers that are alloy-structured and of high performance currently prevailing in polyolefin industry as major high-tier high added-value products. However, owing to the lack of effective control methodologies on alloy composition and phase morphology, the unique polymerization technique has yet to become a main-stream olefin polymerization strategy attracting corresponding attention from polymer chemistry community, which in turn retards the development of high-performance polyolefin alloys. This project is aimed to solve the key scientific issues associated with the compositional and morphological control of polyolefin alloys in hetero-phasic α-olefin copolymerization, establishing a controlled research platform on which hetero-phasic α-olefin copolymerization will be conducted in a well-defined manner and systematic development of new polyolefin alloys with new properties and performance can be expected. The major chemistry intended by this project is to cause chain crosslinking in dispersed polymer phases to reduce their chain mobility, so as to prevent the dispersed polymers’ migration during polymerization and domain coalescence during following processing and service, ultimately accessing as-stabilized polyolefin alloys with quasi-constant phase morphology where the dispersed polymer phases can be tuned of their compositions in a wide range.

基于非均相Ziegler-Natta催化剂的烯烃多相共聚是聚烯烃工业中反应器制备高抗冲聚丙烯和聚烯烃热塑性弹性体等高性能合金化聚烯烃树脂的技术基础。但是，由于缺乏对聚烯烃合金相结构的有效化学控制手段，长期以来，烯烃多相共聚并未成为受高分子化学界关注的重要的烯烃聚合方法，制约了合金化高性能聚烯烃树脂的开发。本项目致力于解决-烯烃多相共聚中影响合金相结构的关键科学问题，推动可控多相共聚方法的建立，使多相共聚和反应器合金化成为聚烯烃高性能化的主流方法。本项目的关键和主要创新点在于拟通过交联降低分散相聚合物分子链的运动能力，使聚烯烃多相共聚物生成即稳定，在聚合过程中不发生分散相聚合物的迁移，在加工使用过程中不发生分散相聚合物的相畴融合，从而合成出相结构稳定的聚烯烃合金树脂，其中分散相组分含量可在宽广范围内调节，而其分散形态保持稳定。

基于非均相Ziegler-Natta催化剂的α-烯烃多相共聚是聚烯烃工业中反应器制备高抗冲聚丙烯和聚烯烃热塑性弹性体等高性能合金化聚烯烃树脂的技术基础。但是，由于缺乏对聚烯烃合金组成和相形态的有效化学控制手段，长期以来，α-烯烃多相共聚并未成为受高分子化学界关注的重要的烯烃聚合方法，制约了合金化高性能聚烯烃树脂的开发。本项目致力于解决α-烯烃多相共聚中影响合金组成和相形态的关键科学问题，推动可控多相共聚方法的建立，使多相共聚和反应器合金化成为聚烯烃高性能化的主流方法。本项目的关键和主要创新点在于通过支化/交联降低分散相聚合物分子链的运动能力，使聚烯烃多相共聚物生成即稳定，在聚合过程中不发生分散相聚合物的迁移，在加工使用过程中不发生分散相聚合物的相畴融合，从而合成出相结构稳定的聚烯烃合金树脂，其中分散相组分含量可在宽广范围内调节，而其分散形态保持稳定。