| Summary: | 博士 === 國立中正大學 === 化學工程研究所 === 100 === Metallocene catalysts have attracted much attention form the both industry and academic because of their capabilities in providing architectural controls for polyolefins. In light of the important applications in the metallocene technology, this research is aiming for the development of new synthetic methods that offer the successful preparation of polypropylene-based stereoregular (including isotactic and syndiotactic) diblock copolymer.
In our reach, stereoregular diblock copolymers will be prepared by two step processes. First, end-functionalized stereoregular polypropylene was generated by conducting the selective transfer chain reaction to chain transfer reagents during the stereospecific propylene polymerization in the pressence of novel chain transfer reagents.(e.g., norbornadieneene/hydrogne (NBD), vinylsilanes/hydrogne, Triethylaluminum/ bromide),and has leads to the generation of end-functionalized stereoregular PPs end –capped with chain transfer agents. Second, post polymerization of the end-functionalized PP via using the end-functional group as the linkage proves the successful generation of stereoregular PP based aiblock copolymers, which have well defined chain structures.
Several novel diblock copolymers, including the poly(propylene)-blcok- poly(styrene) (PP-b-PS), poly(propylene)-blcok-poly(methyl methacrylate) (PP-b-PMMA), poly(propylene)-block–poly(DL-lactide) (PP-b-PLLA), poly(propylene)-blcok-poly(diphenylacrylamide) (PP-b-PDPAA) and poly(propylene)-blcok-poly(3-hexylthiophene) (PP-b-P3HT) were synthesized by the synthetic route. Our results also indicate that the stereoregular polypropylene-based diblock copolymer have uniform chemical structures and block lengths, and are suitable for use in the self-assembly studies for the construction of consistent nanostructures as revealed by TEM and SAXS analyses. Moreover, these novel synthetic routes offer the successful preparations of the structurally well-defined stereoregular polypropylene-based diblock copolymer, which are difficult to prepare by other methods.
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