不同增强粒子对PLA/TPU复合线材力学性能的影响  

Effect of Different Reinforcing Particles on the Mechanical Properties of PLA/TPU Composite Filaments

作　　者：钱鹏 刘力 胡正浪 杨增辉 张忍静 吴海华 QIAN Peng;LIU Li;HU Zhenglang;YANG Zenghui;ZHANG Renjing;WU Haihua(College of Mechanical&Power Engineering,China Three Gorges Univ.,Yichang 443002,China;Hubei Engineering Research Center for Graphite Additive Manufacturing Technology and Equipment,China Three Gorges Univ.,Yichang 443002,China;Yangtze Three Gorges Equipment&Materials Co.,Ltd.,Chengdu 610000,China)

机构地区：[1]三峡大学机械与动力学院,湖北宜昌443002 [2]三峡大学石墨增材制造技术与装备湖北省工程研究中心,湖北宜昌443002 [3]长江三峡设备物资有限公司,成都610000

出　　处：《三峡大学学报（自然科学版）》2022年第4期84-89,共6页Journal of China Three Gorges University：Natural Sciences

基　　金：国家自然科学基金(51575313);华中科技大学材料成形与模具技术国家重点实验室开放课题(P2020-003)。

摘　　要：聚乳酸(PLA)因具有优异的生物相容性而备受关注,但其制品脆性大、韧性不佳,应用范围受限.本文分别以还原氧化石墨烯(rGO)、纳米SiO_(2)和rGO-SiO_(2)作为增强粒子制备了rGO/TPU/PLA、SiO_(2)/TPU/PLA、rGO-SiO_(2)/TPU/PLA等3种复合线材,研究FDM成型件力学性能变化规律,探究不同粒子的增强增韧机理.研究结果表明:当rGO的加入质量分数控制在3%以下时,拉伸强度会有所增加,当超过3%时,因石墨烯局部团聚导致其韧性明显下降;纳米SiO_(2)的加入改善了PLA与TPU界面结合性,使得韧性大幅度增加,而拉伸强度略有增加;与单一增强粒子相比,SiO_(2)和rGO结合在一起改善了其在基体中的分散效果,rGO-SiO_(2)杂化粒子的增强增韧效果更佳,FDM成型件的抗拉强度、韧性均得到了明显提升.Polylactic acid(PLA)has attracted much attention because of its excellent biocompatibility,however,its products are brittle and poor in toughness,which limits its application range.In this paper,three composite filaments of rGO/TPU/PLA,SiO_(2)/TPU/PLA,and rGO-SiO_(2)/TPU/PLA are prepared by using reduced graphene oxide(rGO),nano-SiO_(2) and rGO-SiO_(2) as reinforcing particles.Meanwhile,the changes in the mechanical properties of fused deposition molding(FDM)formed samples are studied,and the mechanism of strengthening and toughening of different particles is explored.The results show that the tensile strength of the composite sample increases as the amount of rGO added is controlled below 3%.Moreover,the toughness of the composite sample decreases significantly due to the local agglomeration of graphene;The addition of nano-SiO_(2) improves the bonding performance of PLA and TPU interface,which greatly increases the toughness of the sample.However the increase in tensile strength is not obvious.The combination of SiO_(2) and rGO improves the dispersion effect of the filler in the matrix compared with a single reinforcing particle.The rGO-SiO_(2) hybrid particle has a better reinforcing and toughening effect,and the tensile strength and toughness of FDM molded parts are significantly improved.

关 键 词：熔融沉积成型 石墨烯复合线材 rGO-SiO_(2)杂化粒子 增韧 增强 

分 类 号：TH145.4[一般工业技术—材料科学与工程]