聚偏氟乙烯擠出加工及改性研究.pdf

1、北京化工大學(xué)碩士學(xué)位論文聚偏氟乙烯擠出加工及改性研究姓名：朱天戈申請學(xué)位級別：碩士專業(yè)：材料加工工程指導(dǎo)教師：苑會林20090531摘要STUDYONEXTRUSIONPRoCESSINGANDMODIFICATIONOFPOLY(VINYLIDENEFLUORIDE)ABSTRACTPoly(vinylidenefluoride)(PVDF)isapolymerwiththehighestmechanicalstrengthinall

2、kindsoffluoroplasticsPVDFmaintainsexcellentstrengthunderhightemperatureandpressurePVDFhasgoodpropertyoftoughness，hardness，wearresistance，UVresistanceandanti—aging，excellentchemicalstabilityFurthermorePVDFhasgoodheatstabi

3、litywhichiSavailableinmoldingprocessingOntheotherhand，PVDFpossessessomedisadvantageslikethehighstrengthundermeltingstatewhichisnoteasilyprocessedandbubblingPVDFhaspooradhesionwhichlimitsitsapplicationasfilmsInthiswork，fi

4、lmsofbinarypolymerblendcomprisingofhydrophobicpoly(vinylidenefluoride)(PVDF)andpoly(methylmethacrylate)(PMMA)havebeenpreparedbymeltingextrusionThedependenceofsurfacestructureandcompositionofthefilmsonthePMMAcontentintheb

5、lendwasinvestigatedbyusingdifferentialscanningcalorimeter(DSC)，XRD，atomicforcemicroscope(AFM)，andXrayphotoelectronspectroscopyIthasbeenfoundthattheinteractionbetweenthetwopolymerspreventsPVDFfromcrystallizationintheblend

6、PMMApreventsPVDFfromcrystallizationandreducesthemeltingtemperatureTheFTIRspectraoftheblendswithdifferentPMMAcontentclearlyshowsthattheoccurrenceofthehydrogenbondingbetweenthefunctionalgroupofthetwopolymersThesurfaceenric

7、hmentphenomenonOCCURSintheblendandPVDFwithlowerfreeenergyintheblendtakeupmoresurfacepositionsTheinfluenceoftheadditionofTi02tothesystemwasaslostudiedAndithasbeenfoundthatTi02increasetheviscosityofthesystem，whichistendtoi