包装用聚乙烯(PE)的性能介绍ppt课件.ppt

《包装用聚乙烯(PE)的性能介绍ppt课件.ppt》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。

1、DetailedintroductiononPolyethyleneWilliamR&D,APPropackHowtoproducePEfromoil?100×104tonbaseoil4kindsbasicmaterialinpetrolproduction:►Alkynes(acetylene)►Olefins(ethene,propylene,butylene,butadiene)►Arene(benzene、toluene、dimethylbenzene)►Themixedgasofabovematerialethene15×104t，Propy

2、lene9.0×104t，Butadiene2.5×104t，Arene8.0×104t，Petrol9.0×104t，Eldingoil47.5×104tcrackingBaseoilFirstproductionSecondproductionCommodityoilThirdproductionManufacturebasicorganisechemicalproductionmaterialOilwithseveralboilingpointrangePE,PP,PSandsoonDistillcatalyse、hydrocracking、del

3、ayedcoking、catalyticreforming、dehydrochlorination、hydrorefiningPolymerizationTankreactorTypicalparticlesizedistributionofPEgranulesPelletcreatingLDPEisahighlybranchedhomopolymerwhichcontainsbothshort-chainandlong-chainbranches.HDPE,MDPEandLLDPEconsistofpredominantlylinearmolecule

4、swithshort-chainbranches,dependingonthetypeandamountofcomonomers.PE:m=0EVOH:R=-OHEVA:R=-COOCH3PVA:n→0,R=-OHEAA:R=-COOH,EMAA,PB-1andsoon.TheclassificationofPENote:ClassificationofpolyethylenegradesbydensityinaccordancewithASTM1248.ClassificationofPEbydensityThebranch-freesequences

5、ofthechainsarefoldedatroomtemperaturetoformcrystallamellae(crystallites).Thelamellaearesheet-likestructuresofuniformthickness;theactualthicknessofthelamellaedependsonthedegreeofbranchingofthemoleculesandontheirthermalhistory.Moleculeloops,chainends,relativelylongbranchesandcomono

6、mer-containingsegmentsofthechainsprotrudefromthecrystallamellae.Thesedefectsformamorphousregionsbetweenthelamellae.ThecrystalstructureofPEresinPolyethylenehasadensityof1.0g/cm3inthecrystallineregionsandadensityof0.86g/cm3intheamorphousregions.ThedensitydescriptionofPEDPE=xDCrysta

7、l+(1-x)DamorphousXiscrystallinityHowtocalculatethedensityofmixedPE?两种结晶性聚合物形成共混物的密度d为1/d=w1/d1+w2/d2（1）  其中,d1、d2分别为两种结晶性聚合物共混后的密度w1、w2分别为两种结晶性聚合物的重量分数  第一种结晶性聚合物共混后的密度d1为1/d1=X1/d1c+(1-X1)/d1a（2）  第二种结晶性聚合物共混后的密度d2为1/d2=X2/d2c+(1-X2)/d2a（3）  其中,d1c、d2c，d1a、d2a分别为两种结晶性聚合物

8、的晶相及非晶相密度.X1、X2分别为两种结晶性聚合物共混后的结晶度  将式（