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

《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