微孔塑料連續(xù)擠出加工工藝與成型口模的研究.pdf

1、學(xué)位論文獨(dú)創(chuàng)性聲明學(xué)位論文獨(dú)創(chuàng)性聲明本人聲明所呈交的學(xué)位論文是本人在導(dǎo)師指導(dǎo)下進(jìn)行的研究工作及取得的研究成果。據(jù)我所知，除了文中特別加以標(biāo)注和致謝的地方外，論文中不包含其他人已經(jīng)發(fā)表或撰寫過的研究成果，也不包含為獲得直昌太堂或其他教育機(jī)構(gòu)的學(xué)位或證書而使用過的材料。與我一同工作的同志對本研究所做的任何貢獻(xiàn)均已在論文中作了明確的說明并表示謝意。學(xué)位論文作者簽名(手寫)磚’呵簽字日期：cbB年月／日學(xué)位論文版權(quán)使用授權(quán)書本學(xué)位論文作者完全了

2、解直昌太堂有關(guān)保留、使用學(xué)位論文的規(guī)定，有權(quán)保留并向國家有關(guān)部門或機(jī)構(gòu)送交論文的復(fù)印件和磁盤，允許論文被查閱和借閱。本人授權(quán)直昌太堂可以將學(xué)位論文的全部或部分內(nèi)容編入有關(guān)數(shù)據(jù)庫進(jìn)行檢索，可以采用影印、縮印或掃描等復(fù)制手段保存、匯編本學(xué)位論文。同時(shí)授權(quán)中國科學(xué)技術(shù)信息研究所和中國學(xué)術(shù)期刊(光盤版)電子雜志社將本學(xué)位論文收錄到《中國學(xué)位論文全文數(shù)據(jù)庫》和《中國優(yōu)秀博碩士學(xué)位論文全文數(shù)據(jù)庫》中全文發(fā)表，并通過網(wǎng)絡(luò)向社會公眾提供信息服務(wù)。(保密

3、的學(xué)位論文在解密后適用本授權(quán)書)學(xué)位論文作者簽名(手寫)：話1呵導(dǎo)師簽名(手寫)：、、簽字日期：山l事年6月f日簽字日期：ao侈年‘月J日ABSTRACTABSTRACTAsanewmacromolecularmaterial，microcellularplasticsISahotresearchfieldinpolymerprocessingmolding，sinceitwasborninthe1980s，andithasavastp

4、otentialforapplicationwithitsexcellentperformanceContinuousextrusionisgenerallyusedwimitsefficientproductionrateandlowcostinpolymerprocess，butthetechnologyincontinuousextrusionofmicrocellularplasticsisimmaturityRapidform

5、ationofthepolymermelt／gashomogeneousphasesystemandalleffectiveformingdiearethekeypointsinmicrocellularplasticscontinuousextrusionAccordingthesolubilityofC02inpolymermelttodeterminethevolumeflowrate，andselectthemethodofsu

6、percriticalC02injectionintothemeltandanappropriateaccelerationdevicetoimprovethemixtureeffectofpolymermeltandC02fortherateofindustrialproductionComparedthetheoryofclassicalnucleationandsummeduptheresultsofpreviousexperim

7、entstoanalyzethefactorofthemeltnucleationintheformingdieOfferasuggestionthatthegas—assistedextrusioninsteadoftherapiddecompressivediebyexploringtheproblemofthetraditionalmoldingdie，andmakeafeasibilitystudyoftheeffectanda

8、dvantageinmicrocellularplasticsSelectdecompressivedieasaprototype，designthemicrocellularplasticextrusionmoldingdieTakeanumericalsimulationofPS／C02homogeneousphasesystemindifferentgeometricparameters，processconditionsandg

9、as—assistedthroughthefiniteelementanalysissoftwarepolyflowThroughthesefactorswhichimpactonthepressureandvelocityfieldsinthemelttoanalyzetheimpactonnucleationmeltVerifythesuperiorityofthegasassistedextrusionbytheresultsof

10、traditionalandgasassistedextrusionfromthenumericalsimulationBuildanexperimentalplatformbysummaryoftheearlierstudiesandsimulatedresults，andusesupercriticalC02andpolypropylenePPfortheexperimentsofthestateswhicharedifferent