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ID:28785087
大小:11.09 MB
页数:73页
时间:2018-12-14
《聚苯撑苯并二噁唑改性聚合物(dhpbo)的制备及结构性能研究-材料加工工程专业毕业论文》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、东华大学硕士学位论文摘要DHPBO一50%纤维/环氧树脂的界面剪切强度(IFSS)与PBO纤维/环氧树脂(IFSS二9.69MPa)相比,分别提高了71.73%、92.55%、77.85和56.33%,达到了16.83MPa、18.87MPa、17.43MPa及15.32MPa。复合材料破坏形貌的SEM分析也显示出纤维界面粘结性能明显改善,由原来界面破坏变成复合材料基体的部分破坏。单纤维压缩弯曲试验显示出DHPBO纤维的压缩弯曲性能也得到了明显改善。考察了PBO、DHPBO纤维在紫外加速老化条件下的紫外稳定性能。DHPBO纤维在紫外照射41
2、2小时后的强度保持率为74.0%,而PBO纤维为35.9%,紫外稳定性能得到明显的改善。关键词:PBO纤维,轻基基团,DHPBO纤维,表面性能,界面剪切强度,紫外稳定性东华大学硕士学位论文ABSTRACTSynthesis,StruetureandProPertiesofModifiedPoly(P一Phenylenebenzoxazole)(DHPBO)ABSTRACTPoly(P一Phenylenebenzobisoxzole)(PBO)fibereanbewidelyusedinadvaneedeomPositesduetoitsex
3、eellenttensilestrength,modulus,thermalresistaneeandflameretardantProPerties.However,theinterfaeialadhesionbetweenPBOfiberandresinmatrix15notsuffieientforPraetiealuses.ThePooradhesion15generallytheresultoftheehemieallyinaetivesurfaeeand/orsmoothsurfaeeofPBOfiber.Inaddition,
4、PBOhaslowereomPressivestrengthandPoorresistaneetoultravioletradiation.Thereforeit15veryimPortanitoimProvetheadhensiveandantiultravioletProPerties.InthisthesishydroxylgrouPswasiniroducedtoPBOmoleeularehaintoimProveitssurfaeeProPertyandcomPressivestrength.Inthisstudy,dihydro
5、xyPBO(DHPBO)eontaininghydroxylgrouPsinmacromolecularchainswasobtainedbyeo一Polymerizationfrom4,6刁iaminoresorcinoldihydroehloride(DAR)andterePhthalieaeid(TPA),withadditionofeertainamounisofZ,5一DihydroxyterePhthalicacid(DHTA)inrePlaeeofTPAinPolyPhosPhoricaeid(PPA).TheFT-IRand
6、elemenianalysisresultsshowedthatDHTAwasineorporatedintoPolymerehains.DHPBOfiberwassPunviadry一etandwet一sPinningteehnique,andthemeehanicalProPerty,thermalProPertyandaggregatingstruetureofthefiberwereinvestigated.ThetensilestrengthofDHPBO一5%fiberandDHPBO一10%fiberweres,24GPaan
7、d5.05GParesPeetively.TheaggregatingstruetureofDHPBOwasaffeetedbytheintroduetionofhydroxylgrouPs.However,theerystallinityofDHPBOfiberwasehangedalittle.ThethermalstabilityofDHPBOfiberwasexeellentandthedeeomPositiontemPeraturewasabout667oCinnitrogenatmosPhere.Thesurfaeesofthe
8、fiberswereearefullyanalyzedandquantified.Theeontactanglesbetweenfiberandwater/ethylaleoho
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