Herein,the effect of in situ formation of the stereocomplex polylactide(sc-PLA)on the crystallization behaviors of poly(L-lactide)/poly(D-lactide)(PLLA/PDLA)blends was assessed.When the melt-blending temperature of th...Herein,the effect of in situ formation of the stereocomplex polylactide(sc-PLA)on the crystallization behaviors of poly(L-lactide)/poly(D-lactide)(PLLA/PDLA)blends was assessed.When the melt-blending temperature of the PLLA/PDLA blend approached the melting temperature of sc-PLA(approximately 220℃),a higher relative content of sc-PLA was achieved.Additionally,the relative content of sc-PLA in the PLLA/PDLA blend increased progressively with the increase in PDLA content.Differential scanning calorimetry analysis revealed that the overall crystallization rate of the homocrystal polylactide were enhanced by the presence of sc-PLA.After crystallization at the same temperature(115 and 120℃),the PLLA/PDLA blends exhibited a shorter half-crystallization time compared to PLLA alone.The size of the microcrystals of PLLA decreased as the sc-PLA content increased.Furthermore,the storage modulus and complex viscosity of the PLLA/PDLA blend increased with higher sc-PLA content.Dynamic mechanical analysis indicated that the glass transition temperature of PLLA in the PLLA/PDLA blends increased with increasing sc-PLA content.Additionally,the Vicat softening temperature increased from 67.8℃ for PLLA alone to 164.7℃ for the PLLA/25PDLA blend,enhancing the heat resistance of the PLLA/PDLA blends.Compared to PLLA alone,the hydrolytic resistance of the PLLA/PDLA blends showed marked improvement.展开更多
基金supported by the Science and Technology Development Plan Project of Jilin Province of China(No.20250203127SF)Chinese Academy of Sciences(Changchun Branch)(No.2025SYHZ0045)+1 种基金Science and Technology Bureau of Jilin Province of China(No.20240302126GX)Science and Technology Bureau of Changchun City of China(No.23SH08).
文摘Herein,the effect of in situ formation of the stereocomplex polylactide(sc-PLA)on the crystallization behaviors of poly(L-lactide)/poly(D-lactide)(PLLA/PDLA)blends was assessed.When the melt-blending temperature of the PLLA/PDLA blend approached the melting temperature of sc-PLA(approximately 220℃),a higher relative content of sc-PLA was achieved.Additionally,the relative content of sc-PLA in the PLLA/PDLA blend increased progressively with the increase in PDLA content.Differential scanning calorimetry analysis revealed that the overall crystallization rate of the homocrystal polylactide were enhanced by the presence of sc-PLA.After crystallization at the same temperature(115 and 120℃),the PLLA/PDLA blends exhibited a shorter half-crystallization time compared to PLLA alone.The size of the microcrystals of PLLA decreased as the sc-PLA content increased.Furthermore,the storage modulus and complex viscosity of the PLLA/PDLA blend increased with higher sc-PLA content.Dynamic mechanical analysis indicated that the glass transition temperature of PLLA in the PLLA/PDLA blends increased with increasing sc-PLA content.Additionally,the Vicat softening temperature increased from 67.8℃ for PLLA alone to 164.7℃ for the PLLA/25PDLA blend,enhancing the heat resistance of the PLLA/PDLA blends.Compared to PLLA alone,the hydrolytic resistance of the PLLA/PDLA blends showed marked improvement.
