熔融沉积成型用聚乙烯/膨胀石墨导热复合材料的制备及性能  

Preparation and Properties of Thermal Conductive Polyethylene/Expanded Graphite Composites for Fused Deposition Modeling

作　　者：薛周航 李庆业 张伟[1] 卢灿辉[1] Zhouhang Xue;Qingye Li;Wei Zhang;Canhui Lu(State Key Laboratory of Polymer Materials Engineering,Polymer Research Institute of Sichuan University,Chengdu 610065,China)

机构地区：[1]高分子材料工程国家重点实验室四川大学高分子研究所,四川成都610065

出　　处：《高分子材料科学与工程》2020年第9期88-96,共9页Polymer Materials Science & Engineering

基　　金：国家自然科学基金重点项目(51433006);四川省科技计划项目(2019YJ0125);高分子材料工程国家重点实验室自主课题(sklpme2019-2-19)。

摘　　要：以膨胀石墨(EG)为填料,通过固相剪切碾磨(S3M)对聚乙烯(PE)/EG复合体系进行分散处理,研究EG含量和S3M对复合材料的力学、微观形态、结晶、流变和热膨胀系数等性能的影响。结果表明,随着EG含量增加,PE/EG复合材料的结晶度先增后减,模量和热导率逐渐升高,拉伸强度、断裂伸长率、热膨胀系数和熔点降低;在相同EG含量下,S3M处理后,EG与PE相容性明显改善,EG尺寸更小更均匀,聚合物基体与填料相互作用增强,在提高复合材料力学性能的同时进一步降低了PE的结晶度和熔点,体系表现出较高的复数黏度和储能模量,其熔融沉积成型(FDM)的精度进一步提升。Well dispersion of expanded graphite(EG)as filler in the polyethylene(PE)/EG composite system was realized via solid-state shear milling(S3 M).And the effects of EG content and S3 M on the properties of composites such as mechanical properties,microstructure,crystallization,rheology and thermal expansion coefficient were studied.The results show that with the increase of EG content,the crystallinity of PE/EG composites increases at first and then decreases,while the modulus and thermal conductivity gradually increase,and the tensile strength,elongation at break,thermal expansion coefficient and melting point decrease.Under the same content of EG,S3 M processing can dramatically improve the compatibility between PE and EG.The EG size becomes smaller and more uniform with enhanced interactions.The mechanical properties of composite materials are improved.In the meantime,the degree of crystallinity and the melting point of PE further decrease.This composite system exhibits high complex viscosity and storage modulus.All these attributes make the composites feasible for FDM 3 D printing with improved resolution.

关 键 词：熔融沉积成型 聚乙烯 膨胀石墨 固相剪切碾磨 

分 类 号：TQ325.12[化学工程—合成树脂塑料工业]