溶剂诱导制备PLLA/HA/GO三元复合材料及其性能研究  

The Solvent Induced Preparation of PLLA/HA/GO Ternary Composite and Its Properties Study

作　　者：霍康伟 孙鑫 杨胜都 廖兴燕 薛白 谢兰[1,2,3,4] 许开华 郑强 HUO Kang-wei;SUN Xin;YANG Sheng-du;LIAO Xing-yan;XUE Bai;XIE Lan;XU Kai-hua;ZHENG Qiang(College of Materials and Metallurgy,Guizhou University,Guiyang 550025,China;National Engineering Research Center for Compounding and Modification of Polymeric Materials,National and Local JointEngineering Research Center for Functional Polymer Membrane Materials and Membrane Processes,Guiyang 550014,China;Chinese National WEEE Recycling Engineering Research Center,Jingmen,518000,China;College of Polymer Science and Engineering,Zhejiang University,Hangzhou 310000,China)

机构地区：[1]贵州大学材料与冶金学院,贵州贵阳550025 [2]贵州省国家复合改性聚合物材料工程技术中心,功能高分子聚合物膜材料及膜过程国家地方联合工程研究中心,贵州贵阳550014 [3]国家电子废弃物循环利用工程技术研究中心,湖北荆门518000 [4]浙江大学材料与化学工程学院,浙江杭州310000

出　　处：《塑料工业》2019年第9期42-47,80,共7页China Plastics Industry

基　　金：国家自然科学基金(51763003);黔教合KY字[2017]061;黔科合LH字[2017]7251;黔科合(20195665);西南科技大学开放基金(No.18zxgk01)

摘　　要：首先通过将羟基磷灰石(HA)及氧化石墨烯(GO)两种纳米填料预混合,得到紧密结合的复合填料,再通过非良溶剂诱导左旋聚乳酸(PLLA)相分离方式,制备了PLLA/HA/GO多孔复合膜。均匀分布的纳米填料能作为异相成核剂诱导PLLA结晶,使复合膜的结晶度由PLLA膜的53.7%提高到61.1%,实现在成型过程中由液-液相分离向固-液相分离的转变,从而影响膜表面的微观结构,并提高材料的热稳定性及力学性能。结果表明,PLLA复合材料的起始热降解温度由315 ℃提高到355 ℃,拉伸强度由35.6 MPa提高到46.7 MPa。除此之外,纳米填料中含有大量羟基、羧基等亲水基团,有效提高了膜的亲水性能,使表观接触角由122°降低到88°。The nano-fillers including hydroxyapatite(HA)and graphene oxide(GO)were firstly premixed to obtain a tightly-bonded composite filler,and then the porous poly- L -lactic acid(PLLA)/HA/GO composite materials were enabled by nonsolvent induced phase separation.Uniformly distributed nanofillers could induce PLLA crystallization as a heterogeneous nucleating agent,and increase the crystallinity of the material from 53.7%to 61.1%of the PLLA membrane,then achieve separation from liquid-liquid phase to solid-liquid phase during the molding process.The microstructure of the membrane surface was affected and the thermal stability and mechanical properties of the material were improved simultaneously.The experimental results show that the initial thermal degradation temperature of the PLLA composite could increase from 315 ℃ to 355 ℃,and the tensile strength could increase from 35.6 MPa to 46.7 MPa.In addition,the nano-filler contains a large number of hydrophilic groups,such as,hydroxyl groups and carboxyl groups,which effectively improve the hydrophilic properties of the film and reduce the apparent contact angle from 122° to 88°.

关 键 词：非溶剂诱导相分离 左旋聚乳酸 羟基羟基磷灰石 氧化石墨烯 力学性能 亲水性 

分 类 号：TQ323.4[化学工程—合成树脂塑料工业]