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1、PE分类特性应用WhatispolyethylenePolyethyleneisthemoststructuredandsimplepolymerandisthemostwidelyusedpolymermateria1.ItismadeupoftheduplicatedCH2-unit・PolyethyleneismadefromtheadditionofCH2=CH2・Theperformanceofpolyethylenedependsonhowitisaggregated.Inmediumpressure(15-30atmospheres),theorganiccompoundc
2、atalyzedbyziegler-nattaisahigh-densitypolyethylene(HDPE).Thepolythenemoleculesthatarepolymerizedinthisconditionarelinearandhavelongchains,withamolecularweightofuptoseveralhundredthousand.Ifitisinthehighpressure(mpa),100-300,hightemperature(190-210°C),superoxideradicalpolymerization,underthecondit
3、ionofcatalyticproductionislowdensitypolyethylene(LDPE),itisbranchedstructure・Aggregatepressuresize:highpressure,mediumvoltage,lowpressure;Methodofpolymerization:slurrymethod,solutionmethod,gasphasemethod;Productdensity:highdensity,mediumdensity,lowdensity,linearlowdensity;Productmolecularweight:l
4、owmolecularweight,ordinarymolecularweight,highmolecularweight・PolyethylenecharacteristicPolyethyleneodourless,non-toxic,feellikewax,hasgoodlowtemperatureresistance(thelowesttemperaturecanreach70~100°C),chemicalstabilityisgood,mostofacidandalkalierosion(acid)withcharacteristicsofoxidationresistanc
5、e,temperaturedoesnotdissolveinsolvents,smallwaterimbibition,excellentelectricalinsulationproperties;Butpolyethyleneissensitivetoenvironmentalstress(chemicalandmechanical),anditisveryresistanttoaging.Thepropertiesofpolyethylenevarydependingonthestructureanddensityofthemolecules・polyethylene(1)LDPE
6、:lowdensitypolyethyleneandhighpressurepolyethylene(2)LLDPE:linearlow-densitypolyethylene(3)MDPE:mediumdensitypolyethyleneandbimodalresin(4)HDPE:highdensitypolyethylene,lowpressurepolyethylene(5)UHMWPE:ultrahighmolecularweightpolyethylene(6)modifiedpolyethylene:CPE,crosslinkedpolyethylene(PEX)(7):
7、ethylenecopolymer(plastic),ethylene/propylenecopolymerEVA,ethylene,ethylenebutenecopolymer一otherolefinssuchasoctenePOE,cyclicolefincopolymer,ethylene/unsatoratedestercopolymer(EAA,EMAA,EEA,EMA,EMMA,EMAH)Themolecularwei
