柔性間隔對RSMA接枝對羥基苯甲酸側鏈液晶高分子液晶性的影響.pdf

1、華中科技大學碩士學位論文柔性間隔對RSMA接枝對羥基苯甲酸側鏈液晶高分子液晶性的影響姓名：劉宏超申請學位級別：碩士專業(yè)：高分子化學與物理指導教師：解孝林2002.5.13華中科技大學碩士學位論文AbstractInordertoeliminatethedefectsinthestructureandmechanicalpropertiesofliquidcrystallinepolymermaterials，anewconceptofr

2、igidlongside—chainliquidcrystallinepolymers(RLSCLCPs)isputforwardbasedonmolecularengineeringBasedonrandomstyrenemaleicanhydridecopolymers(RSMA)andP—hydroxybenzoicacid(HBA)，side—chainliquidcrystallinepolymerswithdifferent

3、flexiblespacersweresynthesizedTheirchemicalstructureandpropertieswerecharacterizedbyFTIR、‘HNMR、POM、DSCandGPCTheeffectofflexiblespacersandthelengthofrigidsidechainsontheliquidcrystallinityofthesynthesizedcopolymersweresys

4、tematicallyinvestigatedFirstly，RSMAwasreactedwithglycolicacid(HOCH2COOH)and12hydroxydodecanoicacid(HO(CHzhICOOH)，respectivelyThegraftingcopolymersRSMAgHOCH2COOHandRSMAg—HO(CH2)IICOOHwereproducedThen，theliquidcrystallineR

5、SMA—g—HBAsidechainpolymerswithdifferentrigidside—chainlengthandflexiblespacersweresynthesizedwithdifferentmolarratiosofHBA／RSMA—gHOCH2COOHandHBA／RSMA—gHO(CH2)IICOOHbysolutioncondensationpolymerizationinthepresentofN，Ndic

6、yclohexylcarbodiimide(DCC)Inordertopreparethemodelcompoundswhichhaveobviousstructureanddifferentlengthsofsidechain，thedimmer(DHBA)andtetramer(THBA)ofphydroxybenzoicacid(HBA)weresynthesizedbyScottBaumannreaction，thengraft

7、edwithRSMA—g—HOCH2COOHandRSMA—g—HO(CH2)IlCOOH，respectivelyTheresultsshowedthattheseproductsallaregraftingcopolymers，andallshownematictextureinmeltingstateunderthepolaropticalmicrocopyItwasworth—mentionedthattheseliquidcr