稀土β成核劑改性無規(guī)共聚聚丙烯的流變性能與結(jié)晶性能研究.pdf

1、河北工業(yè)大學(xué)碩士學(xué)位論文稀土β成核劑改性無規(guī)共聚聚丙烯的流變性能與結(jié)晶性能研究姓名：張梅申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：高分子化學(xué)與物理指導(dǎo)教師：丁會(huì)利201105稀土β成核劑改性無規(guī)共聚聚丙烯的流變性能與結(jié)晶性能研究iiRheologycrystallizationpropertiesofβnucleatingagentmodifiedofPPRABSTRACTPPisexcellentfitscomprehensiveperfmancebu

2、tsomedefectssuchaslowimpactstrengthheatshrinkableetcwhichlimittheapplicationsofPP.ImprovecomprehensiveperfmancecertainaspectsperfmanceofPPthroughchemicalphysicalmodificationcanexptheapplicationrangeofPP.Thispaperresearch

3、PPRwhichmixedwithsixkindsrareearthbetanucleatingagent(WBG1WBG2WBG3WBG4WBG5WBG6)respectivelyanalysethepropertiesofmechanicscrystallizationrheology.BytheresearchofmechanicalpropertiesofthePPRmodifiedbythesixnucleatingagent

4、wefoundthat:thesixβnucleatingagentallcanimprovemechanicsperfmanceofPPR.ElongationofPPRmodifiedbyWBG1(0.3%)、WBG2(0.1%)WBG6(0.1%)respectivelyincreasefrom256.3%to945.4%747.1%411.0%PPRmodifiedbyWBG3WBG5havegoodelongationboth

5、about700%atanycontent(0.1%0.5%)buttheelongationismethan700%whenWBG4(0.1%0.3%)mixedintoPPRalsotheimpactstrengthatroom(25C)lowtemperature(30C)increase.ThesectionofPPRappearsductilefracturetoughnessnestsobviouslyaftermixanu

6、cleatingagent.CrystallizationinfluencesbytheconditionsuchastemperatureshearthermalhistybesidesconcentrationofnucleatingagentwestudiedthecrystallizationbehaviourofPPRitsmodifiedproducts.TheresultsshowthatpurePPRcrystalliz

7、esslowlytheinterfaceofsphaerocrystalsisobviousthecrystallizerateofmodifiedPPRwasspeedupthesizeofsphaerocrystalswasdiminishalsoitappearsnointerfacefmirregular“flowershape“crystalmodifiedPPRbyWBG1(0.3%)、WBG2(0.1%)、WBG3(0.1

8、%)appearestwomoltenabsptionpeaksfromDSCmoltencurvestheβwasabout54.2%、50.6%45%respectivelytheβnucleationeffectisbetterobviouslytheKxofmodifiedPPRareabout29.03%30%30%respectivelybyWAXDitsconsistentwithmechanicalpropertiesD

9、SCincome.ThemachiningextrusionrheologicalbehaviourofPPRareinfluentialbynucleatingagentweconductastudyofPPRmodifiedbyWBG1βnucleatingagent.TheflowactivationenergyofPPRmodifiedby0.1%WBG1waslargeshearstresshasthetrendtodecre

10、asewiththeβnucleatingagentincreaseatthesameshearrateshearviscositydecreasewhenmixintonucleatingagentatthesamelowshearratebutshearviscosityshowsobviousdrawsclosewiththeshearrateshiftywhenshearrateincreasesthePOofPPRwasnot

11、obviouswithdifferentnucleatingagentPPRappearssmalllosepeakat60℃70℃byDMAthedissipationfactofPPRmodifiedbyWBG1isincreasetovaryingdegrees.Keywds:polypropylenerareearthbetanucleatingagentcrystallizationpropertiesrheologicalb