不同成膜工艺对PCL结晶及微生物降解性能的影响

将压延成膜和溶剂成膜制备的聚ε-己内酯(PCL)膜放入降解液进行100d的生物降解,以研究不同成膜工艺对PCL降解性和降解前后结晶的影响。采用显微镜观察降解前后薄膜表面形态变化;通过广角X射线衍射法(WAXD)表征其降解前后结晶变化;利用凝胶渗透色谱(GPC)测定降解过程中PCL相对分子质量和分子量分布的变化。研究结果表明,溶剂成膜工艺可提高PCL亲水性,增大结晶尺寸,提高PCL降解性;而压延成膜工艺使膜表面致密,结晶尺寸减小,但对结晶形态和结晶度影响不大,降解后PCL晶形均未发生大的变化,结晶度有所下降。

Effect of Two Different Film-forming Process on the Crystallization and Biodegradability of PCL

poly ε-caprolactone(PCL) was made by calendar film and solvent film respectively,the film was biodegraded for 100 days in the degradation solution,the effect of different processes on degradation and crystallization before and after degradation of PCL films was investigated.Optical microscope(OM) was used to observe the surface morphology of PCL films before and after degradation;the wide-angle X-ray diffraction(WAXD) was used to characterize crystallization of PCL films before and after degradation;gel permeation chromatography(GPC) was used to determine the molecular weight and molecular weight distribution of PCL in the process of degradation.The results show: solvent film technology can improve the PCL hydrophilic,increase the crystal size,enhance biodegradation of PCL,while rolling film manufacturing improves the membrane surface density,decreases crystal size,but has little effect on the crystal form and crystallinity.The degraded PCL crystal does not notably change,the crystallinity decreases.