SYNTHESIS AND CHARACTERIZATION OF METHACRYLIC BLOCK COPOLYMER

• Main Authors: LIM, MING SHYAN, 林明賢
• Other Authors: DAVID
• Format: Others
• Language: zh-TW
• Published: 1996
• Online Access: http://ndltd.ncl.edu.tw/handle/56721627835480964497

碩士 === 國立中央大學 === 化學工程學系 === 84 === Abstract The major purpose of this study is familiar with group transfer polymerization (GTP) and tried to synthesize diblock copolymer by GTP. For our synthesis experiment ,we elected to use methyl ethacrylate(MMA) and dimethylaminoethyl methacrylate (DMAEMA). At first, research the effect of residuary reactant initiator on polymerization. Then research the effect of reaction conditions on polymerization. The results show the obvious increase of molecular weight and molecular weight distribution as initiator includes a little n-butyllithium,lithium diisopropylamine and trimethylchlorosiline in polymerization reaction. If initiator includes a little diisopropylamine,methyl isobutyrate,diether etheranhydrous,it has no effect for molecular weight and molecular weight distribution. GTP polymerization is an exothermic reaction，it shows reaction end point as reaction temperature decreases to the original point，and molecular weight and molecular weight distribution have no more variation. Initiator quantity gets inverse ratio to molecular weight，but it has no effect to molecular weight distribution. It can proceed reaction in the allowable concentration ratio of catalyst and initiator，molecular weight distribution will increase as catalyst uses much more than it needs. It can proceed reaction in the allowable temperature range，the temperature has no effect to molecular weight and molecular weight distribution. This experiment of GTP method can polymerize the block copolymer of narrow molecular weight distribution. Keywords:group transfer polymerization(GTP), block copolymer, methyl methacrylate, dimethylaminoethyl methacrylate,