材料科学与工艺MATERIALSSCIENCEANDTECHNOLOGYD()l:10.11951/j.issn.1005-0299.20190282UHMWPE初生态微观结构及不同成型条件下制品力学性能研究胡逸伦撰,3,赵文静1,2,3,李志1,2,3,夏晋程1,2,3,冯玲英1,2,3,沈贤婷质,,,洪尉1,2,3(1.聚烯炷催化技术与高性能材料国家重点实验室,上海200062;2.上海市聚烯炷催化技术重点实验室,上海200062;3.上海化工研究院有限公司,上海200062)摘要:超高分子量聚乙烯(UHMWPE)极高的分子量及线性分子链特性使其具备很多的优异性能,在军工、医药卫生等领域的应用越来越广泛的同时,对UHMWPE树脂的性能不断提出更高的要求。故利用高分辨扫描电镜(SEM)、高温凝胶色谱-红外联用(GPC-IR)、拉曼光谱(Raman)及差式扫描量热仪(DSC)对树脂初生态粒子的结晶结构、分子特性及热力学性能进行了研究,并通过控制模压过程中的冷却速率来研究UHMWPE样品的结晶行为,进而分析UHMWPE微观特性与宏观性能之间的关系。研究发现由次级颗粒和微纤组成的UHMWPE初生态粒子中具有大量的片晶和伸直链,分子链排列规整,结晶度高;但在熔融再结晶加工成制品的过程中,分子链的规整性遭到破坏,与初生态粒子相比,绪晶度下降、缠结密度变大。另外,不同降温速率的样品中淬冷样品的分子链缠结密度最低,而低缠结、小的晶粒能够提升制品的耐冲击性能及断裂时的其应力。关键词:超高分子量聚乙烯;初生态粒子;结晶;缠结;力学性能中图分类号:0631.1+文献标志码:A文章编号:1005-0299(2020)05-0001-10ResearchonthemicrostructureofUHMWPEprimaryparticlesandmechanicalperformancesofproductsunderdifferentprocessingconditionsHUYilunl23,ZHAOWenjing1*2*3,LIZhi123,XIAJincheng1*2*3,FENGLingying撰,3,SHENXianting12HONGWei123(1.StateKeyLaboratoryofPolyolefinandCatalysis,Shanghai200062,China;2.ShanghaiKeyLaboratoryofpolyolefin,Shanghai200062,China;3.ShanghaiResearchinstituteofChemicalIndustryCo.Ltd,Shanghai200062,China)Abstract:Ultra-HighMolecularWeightPolyethylene(UHMWPE)possessesextremelyhighmolecularweightandlinearmolecularchainwithexcellentpeifonnances,andthemoldedproductsarewidelyusedasstnicturalmaterialsinmilitary,medical&healthandotherfields.Inthispaper,high-resolutionscanningelectronmicroscopy(SEM),hightemperaturegelchromatography-infrared(GPC-IR),Ramanspectroscopy(Raman)anddifferentialscanningcalorimetry(DSC)wereusedtostudythecrystalstmetlire,molecularpropertiesandlluM'inodynainicpropertiesoftheprimarypowders.ThecrystallizationbehaviorofUHMWPEsampleswasalsoinvestigatedaldifferentcoolingraleduringmoldingtodelenninetherelationshipbetweenthemicroscopicmoipliologyandthemacroscopicproperties.Resultsshowthattheprimaiyparticlesarecomposedofsub-particlesandfibrils,andexhibithighcrystallinitywiththeneatarrangementofthemacromoleculechains.1lowever,thisregularitywouldbedestroyedduringmeltingandrecrystallizing.Ascomparedwiththeprimaiypowder,theciystallinityofthemoldedsheetsdecreased;whileitsentanglementdensityincreased.Inaddition,thequenchedsheetsrevealthelowerenlaiiglem(*nldensityandsmallercrystallinesize,thusresultinginstrongimpactresistanceandgreattruefracturestress.Keywords:UHMWPE;primaryparticles;crystallinity;entanglement;mechanicalperformance收稿日期:2019-10-17,网络出版日期:2020-09-15.基金项目:国家重点研发计划资助项目(2016YFB0302302);上海市经济和信息化委员会审批的上海市军民融合专项项目(高性能防弹复合材料制品及其纤维级树脂的产业化与军民融合应用.2017-47)资助.作者简介:胡逸伦(1993-),女.硕士研究生.通信作者:李志.E-mail:jveran@163.com期刊网址:http://hit.alljoumals.cn/mst_cn/ch/index,aspxUHMWPE是指分子量大于1.0x106g/mol的聚乙烯,具有优异的耐磨性、耐冲击性...