Influence of supercritical CO_2 treatment on poperties of polylactic acid fiber

The paper used fiber melting point instrument,X-ray diffraction spectrometry(WAXS),double refraction rate tester to study the physical properties and micro-structure of polylactic acid(PLA) fibers treated with supercritical CO2 under different process conditions,the aim is to promote the application of no-water technique for dyeing and printing fabrics.The properties of PLA fibers treated by using supercritical CO2 were compared with those treated by using water.The results showed that within the experiment conditions,as increasing the temperature,time,and pressure in supercritical CO2 threatment,the breaking strength,breaking elongation,and the degree of orientation of the treated fibers decreased and the melting point,and crystallinity increased.The change of properties of polylactic acid fiber treated using supercritical CO2 was more significant as compared with using water.