Design high heat-resistant stereocomplex poly(lactide acid) by cross-linking and plasticizing

作者：Cui, Li^*; Wang, Yahui; Zhang, Rundong; Liu, Yun

来源：Advances in Polymer Technology, 2018, 37(7): 2429-2435.

DOI：10.1002/adv.21917

• Cross-link
• heat-resistant
• plasticizer
• poly(lactide acid)
• stereocomplex-type

Effects of cross-linking agent (TAIC) and plasticizer (PEG) on stereocomplex-type poly(lactide acid) (sc-PLA) formation and heat resistance properties were conducted. Both homochiral poly(lactide acid) (hc-PLA) and sc-PLA formed in poly(L-lactide acid) (PLLA)/poly(D-lactide acid) (PDLA) blend. After cross-linking, both enthalpy and T-m of hc-PLA or sc-PLA in cross-linked PLLA/PDLA blends all decreased with TAIC content increase. Differential scanning calorimetry (DSC) and wide-angle X-ray diffraction (WAXD) analyses indicated that sc-PLA crystallites exclusively formed, without any hc-PLA as the result of the further incorporation of more than 5 phr PEG plasticizer. Heat resistance properties were analyzed through thermogravimetric analysis and vicat softening temperature. Results indicated that chemical cross-linking improved the heat resistance of PLLA/PDLA sample. Moreover, lower concentrations of plasticizer PEG contributed to further improve the heat resistance of cross-linked PLLA/PDLA. The influence of TAIC and PEG on the thermal stability of PLLA/PDLA was also investigated using DSC.

• 出版日期2018-11
• 单位武汉纺织大学