| Summary: | 碩士 === 國立中正大學 === 化學工程研究所 === 103 === Light emitting polymers typically posses the π-conjugated light- emitting units so as to allow the light abortion, energy transfer and light-emitting processes to take place. Currently, stereoregularity effects of light-emitting polymers have not been fully investigated because of the difficulty in the syntheses of stereoregular light-emitting polymers.
The stereorularity of styrene monomer can be controlled by stereospecific polymerization of styrene using stereoregular coordination complexes as the polymerization catalysts (e.g., Zieglar-Natta and metallocene).
This study aims to synthesized novel side-chain conjugated polymers, which have the unique structure of maintaining a syndiospecific stereoregularity in their corresponding conjugated side-chain.
Our syntheses of these polymers are based on the following synthetic steps:
I.9,9-dimethyl-2-(4-vinylphenyl)-9H-fluorene monomer was synthesized by coupling 4-bromostyrene with aromatic boronic acid through palladium-catalyst-mediated Suzuki cross coupling reaction.
II.End-functionalized vinylsilane -capped-sP(DMFlSty) was synthesized by conducting the syndiospecific polymerization of 9,9-dimethyl-2-(4- vinylphenyl)-9H-fluorene in the presence of dimethylphenylvinylsilane (DMPhVS:chain transfer agent), using Cp*Ti(OMe)3/MAO as the catalyst.
III.The resulting vinylsilane end-capped sP(DMFlSty) was used to undergo the desilylation and hydroboration to generate OH-capped sP(DMFlSty).
IV.sP(DMFlSty)-b-PLLA was prepared by conducting the controlled-living ring opening polymerization of L-lactide using the sP(DMFlSty)–t-OH as the macroinitiator. The resulting stereoregular diblock copolymers were observed to possess precise chemical architectures (define chemical structures with narrow ranges of molecular weight distribution) and hence the study of using these novel block copolymer samples for molecular self-assembly study is currently under way.
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