Application of Ru[bpy(CH2Cl)2]3(PF6)2 coupling agent on synthesis of star-shaped polybutadiene
碩士 === 國立中正大學 === 化學工程研究所 === 88 === This report describes the use of Ru reagent with six chloromethyl functionalities, Ru[bpy(CH2Cl)2]3(PF6)2, as a multifunctional metal com-plex coupling agent for the anionic synthesis of star shaped polybutadiene. Living polybutadiene arms with narrow molecular w...
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| Format: | Others |
| Language: | zh-TW |
| Published: |
2000
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| Online Access: | http://ndltd.ncl.edu.tw/handle/24061430617402068517 |
| Summary: | 碩士 === 國立中正大學 === 化學工程研究所 === 88 === This report describes the use of Ru reagent with six chloromethyl functionalities, Ru[bpy(CH2Cl)2]3(PF6)2, as a multifunctional metal com-plex coupling agent for the anionic synthesis of star shaped polybutadiene. Living polybutadiene arms with narrow molecular weight distribution
were prepared by anionic polymerization, followed by the addition of Ru complex coupling agent. Coupling efficiency and the number of arms on the resulting star polybutadiene were determined by GPC using poly-styrene standard and MWs were measured by the multiple-angle laser light scattering (MALLS).
GPC analyses indicate that the optimal temperature is 800C and the optimal amount of THF polar additive is 600 ppm for the coupling reac-tion. The Ru-centered star polybutadiene reachs an upper MW limit of ~24k regardless of the MW of living polybutadiene arm and exhibits ther-mal properties analogous to the linear Butadiene. Experiments conducted under different polymerization conditions and the corresponding results were also discussed in this paper.
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