| Summary: | 碩士 === 國立中正大學 === 化學工程所 === 97 === In this study, we report that conducting ethylene and propylene polymerization in the presence of triethylaluminum (chain transfer agent) using ansa-metallocene catalyst (Ph2C(Cp)(Flu)ZrCl2) and (rac-C2H4(Ind)2ZrCl2) can result in the generation of diethylaluminum-capped ethylene - propylene rubber(EPR-AlEt2) as the exclusive chain transfer reaction product. The resulting diethylaluminum-capped EPR can be treated with oxygen and hydrogen peroxide to provide the hydroxy-capped EPR (EPR-OH) as the end-functionalized prepolymer.
The hydroxyl end-group of the EPR-OH can be used to undergo living ring opening polymerization of ε-caprolactone and L-lactide; OK, novel diblock copolymers, including EPR-block-PCL and EPR-block-PLLA, can be successfully prepared with high yield. Our studies clearly demonstrate that using the EPR-OH as the macroinitiator for conducting living postpolymerization can led to the successful preparations of novel diblock copolymers, which do not require the tedious fractionation processes for removing homopolymers. The resulting diblock copolymers possess precise chemical architectures (well-defined chemical structures with narrow ranges of molecular weight distribution) and can be self-organized into consistent nanostructures as evidenced by small angle X-ray scattering and transmission electron microscope, (TEM) studies.
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