Preparation and properties of polylactic acid plasticized by fully bio-based furan dicarboxylate
In order to improve the inherent brittleness of polylactic acid(PLA)for extending its application range,through the esterification reaction of 2,5-furan dicarboxylic acid and natural fatty alcohols,a bio-based furan dicarboxylate(DAF)plasticizer with a novel structure was designed and synthesized.The plasticizing law and mechanism of DAF on PLA were studied systematical-ly through the tensile property test,melting and crystallization behavior analysis,thermogravimetric behavior analysis,dynamic mechanical properties analysis and micro morphology analysis.The results show that DAF has excellent plasticizing and toughening effects,the elongation at break of PLA plasticized by DAF is increased from 7%(PLA)to 211.68%when DAF is added at 10 wt%,which is better than that of PLA plasticized by dioctyl terephthalate(DOTP)with the same contents,and even comparable to the plasticizing efficiency when DOTP is added at 20 wt%.With the increase of DAF addition,the glass transition temperature and melting temperature of PLA/DAF gradually decreases,thereby enhancing the processability of PLA.Although the thermal stability gradually deteriorates,there is little difference with PLA/DOTP,and the compatibility of DAF and PLA is good.It is found that DAF shows a good substitution effect for DOTP in plasticized PLA.
万方数据
维普
