紫外光辐照法制备聚乳酸/纳米银复合薄膜  

Preparation of polylactic acid/nano-silver composite films by ultraviolet irradiation

作　　者：魏涛[1] 朱永军[1] 慈书亭 郭建兵[1] 

机构地区：[1]贵州大学材料与冶金学院,国家复合改性聚合物材料工程技术研究中心,贵州省贵阳市550025

出　　处：《合成树脂及塑料》2014年第4期29-32,共4页China Synthetic Resin and Plastics

摘　　要：采用流延法制备聚乳酸/硝酸银薄膜,再经紫外光辐照得到聚乳酸/纳米银复合薄膜。用扫描电子显微镜证实聚乳酸/纳米银复合薄膜中存在纳米银,且纳米银较均匀地分布在薄膜中。采用傅里叶变换红外光谱、X射线衍射、差示扫描量热法-热重分析表明:随着硝酸银含量的增加,聚乳酸/纳米银复合薄膜的结晶峰先变宽后变窄;纳米银起异相成核作用,促使聚乳酸结晶;当聚乳酸与硝酸银的质量比为100∶10,经紫外光辐照后,纳米银的粒径在100 nm以内,纳米效应得到体现,复合薄膜的热稳定性得到提高。Films of polylactic acid （PLA）/silver nitrate were prepared by casting method, and then PLA/nano-silver composite films were produced via ultraviolet irradiation. It was confirmed that nano-silver existed and evenly distributed in the composite films by means of scanning electron micrograph （SEM）. The results of Fourier transform infrared spectroscopy （FTIR）, X-ray diffraction （XRD）, differential scanning calorimetry （DSC） and thermogravimetry （TG） showed that the crystallization peak of PLA/nano-silver composite films first widened and then narrowed when the content of silver nitrate increased. The crystallization of PLA was promoted owing to the effect of heterogeneous nucleation of nano-silver. The diameter of silver nano-particles was within 100 nm after ultraviolet irradiation when the mass ratio of PLA to silver nitrate was 100∶10. As a result, nano effect of silver nano-particles and consequently the thermal stability of the composite films were improved.

关 键 词：聚乳酸 纳米银 复合薄膜 紫外光辐照法 

分 类 号：TB383.2[一般工业技术—材料科学与工程] TB383.1