PMMA8809德固赛---ThemechanicalstrengthofPMMAisrelativelyhigh:therelativemolecularweightofPMMAisabout1.99million,whichisalong-chainpolymercompound,andthemolecularchainformedisverysoft.Therefore,thestrengthofPMMAisrelativelyhigh,anditstensileandimpactresistanceare8-19timeshigherthanthatofordinaryglass.ThereisakindofPMMAwhichhasbeentreatedbyheatingandstretching,inwhichthemolecularchainsegmentsarearrangedinaveryorderlyway,sothatthetoughnessofthematerialissignificantlyimproved.Ifanailisdrivenintotheplexiglass,evenifthenailispenetrated,therewillbenocrackontheplexiglass.Thiskindofplexiglasswillnotbreakintopiecesafterbeingpuncturedbyabullet.Therefore,thestretchedplexiglasscanbeusedasbulletproofglassandcockpitcoverofmilitaryaircraft.ThemeltingpointofPMMAislower:themeltingpointofPMMAisabout129-141c,whichismuchlowerthanthatofglassatabout1000℃.PMMA8809德固赛--PMMA在香港都称亚克力，一般而言，PMMA的拉伸强度可达到50-77MPa水平，弯曲强度可达到90-130MPa，这些性能数据的上限已达到甚至超过某些工程塑料。其断裂伸长率仅2%-3%，故力学性能特征基本上属于硬而脆的塑料，且具有缺口敏***，在应力下易开裂，但断裂时断口不像聚***和普通无机玻璃那样尖锐参差不齐。40℃是一个二级转变温度，相当于侧甲基开始运动的温度，超过40℃，该材料的韧性，延展性有所改善。ThemostpotentialuseofPMMAistoproduceopticalmediasuchasDVD.PMMAmanufacturerssaidthatcomparedwithpolycarbonatePC,PMMAhasmanyadvantagesthatthelatterdoesnoth***e,suchasbetteropticalperformanceanddatastorageperformance,andbetterscratchresistance.TheybelievethatPMMAwilltakebackalargeshareofDVDmarketfromPC;however,anothermanufacturerbelievesthatifthepriceofMMAisnotlowered,PMMAwillnotbeabletocompetewithPCanditsgrowthratewillnotexceedthatofotherpolymers,suchashexanediolmodifiedPE)