聚对苯二甲酸-共-丁二酸丁二醇酯(pbst)的成核剂和共聚改性研究

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1、东华大学硕士学位论文摘要synthesizedfromthestartingmaterialsofterephthalicacid(PTA)，succinicacid(SA)，1，4-butanediol(1，4-BD)inthepresenceoftetraisopropoxidetitanium(TTiPO)asthebulkpolycondensationcatalystandkaolin，talcandsilicaasthenucleatingagent．Angletestofthepreparedcopolyestersshowedthatincr

2、easedasthenucleatingagentisadded，thehydrophilicwouldworsebeforetheygetbetter，amongthem，thekaolinmodifiedcopolyesterhydrophilicchangedobviously．WAXDresultsindicatedthatthecrystalstructuresofthemodifiedcopolyestershavenotchanged，theaddednucleatingagentimprovedthecrystallinityofcopoly

3、esterssystem，perfectedthecrystalstructures．ContraststretchingbeforeandafterthemodificationofPBSTpolyesterswide—angletestresults，showedthatpolyestersinducedorientation，thepositionsofthecharacteristicpeaksdidnotchange，andpartsofthediffractionpeaksgraduallyrushedintowidepeakor‘‘should

4、erpeak”．ThestudiesontheisothermalcrystallizationkineticsofnucleatingagentmodifiedPBSTcopolyestersshowedthatnucleatingagentsignificantlyimprovedthecrystallizationrateofPBST，embodiedintheexothermicpeakswidthdecreased，therelativecrystallinityvariationcurvesslopeincreasedobviously，semi

5、crystallinetime(ill2)decreased．Basedontheanalysisandcomparisonofthreekindsofnucleatingagentandmodifiedcopolyestertestresults，itwouldbeknownthatthebestadditiveamountrespectivelykaolinadditionis2．5％，thetalcpowderis2％，thesilicais0．5％and2％．revealedthatthemodifiedcopolyesterisothermalcr

6、ystallizationexothermicpeakwidthofthesmallest，leastsemicrystallinetime(tl／2)，thecrystallizationrateisoptimal．Themechanicalpropertiestestshowedthatnucleatingagentwassignificantlyimprovedthetensilefracturestrengthofcopolyesters．ComprehensivecomparisonfoundthatthemodifiedPBSTcopolyest

7、erswithkaolinhasoptimalperformance，boththermo-dynamicperformance，andthebestadditiveamountiSlwt％．Aserisofaliphatic—aromaticPBSTcopolyesterwithdifferentqualitypercentageoffourthmonomer，respectively，O．25％，O．5％，0．75％，1．0％，1．2．5％，wereefficientlysynthesizedfromthestartingmaterialsofPTA，S

8、A，1,4-BDinthepresenceofTTi