改性聚乳酸/生物玻璃复合纳米纤维的结构与性能  

Structure and Properties of Modified Poly-L- Lactic Acid/Bioglass Composite Nanofiber

作　　者：倪茂君[1] 王静霞[1] 郭丹[1] 陈屿恒 陈竹平[1] 彭朝荣[1] Maojun Ni;Jingxia Wang;Dan Guo;Yuheng Chen;Zhuping Chen;Chaorong Peng(Sichuan Institute of Atomic Energy,Chengdu 610101,China)

机构地区：[1]四川省原子能研究院,四川成都610101

出　　处：《高分子材料科学与工程》2019年第2期68-73,共6页Polymer Materials Science & Engineering

基　　金：四川省科技支撑计划(2015SZ0089;2017SZ0101)

摘　　要：将辐照接枝改性聚乳酸(MPLLA)与纳米生物玻璃(NBG)复合,通过静电纺丝工艺制备MPLLA/NBG复合纳米纤维。利用红外光谱、扫描电镜、力学性能、表面接触角和体外矿化,研究聚乳酸接枝改性对复合纳米纤维结构及性能的影响。结果表明,辐射接枝改性有利于提高聚乳酸与NBG之间的相容性,减小纳米粉体团聚,纤维直径减小,分布变窄;复合纳米纤维横向拉伸强度均大于5.5 MPa,纵向拉伸强度从3.9 MPa提高到5.5 MPa,横向、纵向拉伸强度差距随接枝率增大而减小;PLLA/NBG与10%MPLLA/NBG表面水接触角20 s内无明显差异,20%MPLLA/NBG表面水接触角20 s内从134.2°降低至78.6°;接枝改性提高了复合纳米纤维矿化度,20%MPLLA/NBG在24 h内快速矿化,14d矿化度较PLLA/NBG与10%MPLLA/NBG分别提高7.88倍和6.18倍。MPLLA/NBG composite nanofibers were prepared by combination of irradiation grafting modified poly lactic acid (MPLLA) and nano-bioglass (NBG) though electrospinning technique. The effects of grafting modification of PLLA on structure and properties of the composite nanofibers were studied by FT-IR, SEM, mechanical test, contact angle and in vitro mineralization. The results show that the compatibility of PLLA and NBG can be improved by irradiation grafting of PLLA, the powder reuniting decreases as well as the fiber diameter and distribution. The transverse tensile strength of the composite nanofibers is all above 5.5 MPa and the longitudinal tensile strength increases from 3.9 MPa to 5.5 MPa. The transverse and longitudinal differences are decreased with the increasing of grafting ratio. There is no significant difference in the water contact angle of PLLA /NBG and 10%MPLLA/NBG within 20 s. While the water contact angle of 20%MPLLA/NBG decreases from 134.2° to 78.6° in 20 s, indicating the hydrophilicity increases. The in vitro mineralization property of composite nanofiber is improved through grafting modification. The 20% MPLLA/NBG is quickly mineralized in 24 h. And the degree of mineralization in 14 d is 7.88 and 6.18 times of PLLA/NBG and 10%MPLLA/NBG, respectively.

关 键 词：改性聚乳酸 生物玻璃 纳米纤维 拉伸强度 亲水性 体外矿化 

分 类 号：TB383[一般工业技术—材料科学与工程]