PGA,PLA,PGLA碱处理改性及降解性能

采用NaOH对聚乙交酯(polyglycolic acid,PGA)、聚丙交酯(polylactic acid,PLA)及聚乙交酯丙交酯(poly(L-lactide-co-glycolide),PGLA)纤维进行处理.将一定量的试样纤维置于温度为37℃和pH值为7.4的磷酸盐缓冲溶液(PBS)中进行3周的体外降解试验.通过测定纤维熔点、接触角、质量损失、强力损失以及纤维表面形态,对PGA,PLA及PGLA纤维碱处理后的热力学降解性能进行研究探讨.研究表明,碱处理后PLA的熔点略有升高,PGA和PGLA的熔点略有降低,3种纤维的水接触角、质量和强力减小;降解过程中PGA和PGLA的质量损失和强力损失显著,而PLA变化很小.     

Potassium Dichromate Surface Modification of Polyglycolic Acid (PGA) Multifilament

For improving its hydrophilicity and biocompatibility,and preserving filament mechanical properties at the same time,polyglycolic acid( PGA) filament was modified by potassium dichromate solution with different processing time. Breaking force and water contact angle were tested. Surface changes before and after surface modifications were tested with scanning electron microscopy(SEM). Furthermore,differential scanning calorimeter(DSC) and Fourier transform infrared spectrometry(FTIR) were used to analyze the changes of molecular structure and functional group. Experimental results showed that 6 min was the most suitable time for improving hydrophilicity of PGA filament and preserving its mechanical properties.