成核劑對(duì)TIPS法聚丙烯多孔膜結(jié)構(gòu)和透過性能的影響.pdf

1、河北工業(yè)大學(xué)碩士學(xué)位論文成核劑對(duì)TIPS法聚丙烯多孔膜結(jié)構(gòu)和透過性能的影響姓名：孟朋艷申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：化學(xué)工程指導(dǎo)教師：楊振生20080501河北工業(yè)大學(xué)碩士學(xué)位論文iiEFFECTOFNUCLEATINGAGENTSONMPHOLOGYPERMEABILITYOFPOLYPROPYLENEPOUSMEMBRANEVIATHERMALLYINDUCEDPHASESEPARATIONABSTRACTIsotacticpolypro

2、pylene(iPP)membraneisanoutstingmembraneintermsoflowcostgoodrisistancetochemicalsetc.TheiPPmembraneviathermallyinducedphaseseparation(TIPS)hasaseriesofadvantagesthanthatoneviameltspinningcoldstretchingsuchashigherpermeabi

3、litynarrowerpesizedistributionbettermechanicalproperties.Thedomesticmanufactieshaven’tproducedthemembraneviaTIPS.ThemembraneviaTIPSfrominternationalmarketisexpensive.TherearefewinvestigationstopreparemembranebyTIPSinlite

4、ratureaswell.SothepreparationofiPPmembraneviaTIPShassignificantvalue.HowevermembraneviaTIPSisapttofmingclosepeswhichgreatlydecreasesmembranepermeability.Nucleatingagentsmayimprovethesituation.Sotheaimofthispaperwastoindi

5、catemembranefmationwithiPPDBPDOPnucleatingagentssystemsviaTIPSaswellaseffectofnucleatingagentsonmphologypermeabilityofiPPmembrane.ThemembraneviaTIPSwasinurgentneedofsolvingtheproblemoflowpermeability.Thepaperadoptedthepu

6、rewaterfluxasevaluationcriteriontoscreennucleatingagents.Itwasindicatedthatthepurewaterfluxincreaseswithsubsequentlydecreaseshasamaximalvaluewhenamountofnucleatingagentincreases.Onthebasisofpurewaterfluxvaluewescreenedou

7、tthreetypicalnucleatingagenswhichwereA、BGrespectively.AmongthenucleatingagentsthepurewaterfluxofABarethesmallestbiggestrespectivelyGisβnucleatingagent.TheeffectofnucleatingagentsoncrystallizationbehavisfiPPDBPDOPsystemwa

8、sinvestigatedbyusingwideangleXraydiffraction(WAXD)differentialscanningcalimetry(DSC).Itwasindicatedthatβnucleatingagentdidn’tfmβcrystalaswellasthechangingofnucleatingagentscanaffectcrystallizationparameterssuchasnucleard

9、ensity(N)、crystallizationtemperature(tf)、halfwidth(Wh)、cryatallizationscope(△t)crystallinityetc.WhenaddingnucleatingagentANtfincreasedabout10times3.1℃respectively、Wh△tdecreased0.7℃1.8℃aswell.WhenaddingnucleatingagentBN、t

10、f、Wh△tincreasedabout100times、6.5℃、1.5℃4.8℃respectively.TheeffectofnucleatingagentsABonmphologypermeabilityofmembranewasinvestigated.Itwasfoundthatthemphologyofallmembranewasamixtureoftypicalparticulatestructureiginatingf