Syndiospecific copolymerization of styrene with methylstyrene-terminated styrene macromonomer by Cp*Ti(OMe)3-MAO catalyst
碩士 === 國立中正大學 === 化學工程研究所 === 89 === Syndiotactic polystyrene( sPS ) has many good properties such as high melting point (Tm=270℃)、high glass transfer temperature (Tg=100℃)、high degree of crystallinity、good hardness and fast rate of crystallization. However, the high crystallinity of sPs...
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| Format: | Others |
| Language: | zh-TW |
| Published: |
2001
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| Online Access: | http://ndltd.ncl.edu.tw/handle/61818844138094675941 |
| Summary: | 碩士 === 國立中正大學 === 化學工程研究所 === 89 === Syndiotactic polystyrene( sPS ) has many good properties such as high melting point (Tm=270℃)、high glass transfer temperature (Tg=100℃)、high degree of crystallinity、good hardness and fast rate of crystallization. However, the high crystallinity of sPs causes brittleness and tends to break easily upon stress. Because the crystallinity varies with the synthesis conditions, sPS can be a better material with greater use if containing anther polymer in its molecular structure.
Therefore this study, anion polymerization was proceeded to construct this uniform length atactic functionalized polystyrene with uniform length, followed by the use of Metallocene catalyst to do its syndiotactic copolymerization with styrene. The resulting molecule is a syndiotactic polystyrene grafted with atactic polystyrene side chains.
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