Greatly accelerated crystallization of poly(lactic acid): cooperative effect of stereocomplex crystallites and polyethylene glycol

Greatly accelerated crystallization of poly(lactic acid): cooperative effect of stereocomplex crystallites and polyethylene glycol
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大大加速聚乳酸结晶:立构复合物微晶与聚乙二醇的协同作用

DOI:
10.1007/s00396-013-3067-x
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发表时间:
2013
影响因子:
2.4
通讯作者:
Ming-Bo Yang
Ming-Bo Yang
中科院分区:
化学4区
文献类型:
--
作者:
Xin-Feng Wei;Rui-Ying Bao;Zhi-Qiang Cao;Liang-Qing Zhang;Zheng-Ying Liu;Wei Yang;Bang-Hu Xie;Ming-Bo Yang

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对映体聚l-乳酸(PLLA)和聚d-乳酸(PDLA)之间的立体配合结晶(SC),与PLLA和PDLA相比,其耐热性和力学性能有很大提高,是一种良好的聚乳酸(PLA)成核剂。研究了SC和/或聚乙二醇(PEG)对聚乳酸结晶行为的影响。非等温结晶动力学和等温结晶动力学表明,SC和PEG分别通过非均相成核和提高晶体生长速率来促进PLA的结晶速率。然而,单独使用时,它们的促进作用有限,改性PLA在20℃/min的冷却速率下不能完全结晶。当SC和PEG同时存在时,PLA的结晶速度大大加快,即使在40℃/min的冷却速率下,PLA也能完全结晶并获得较高的结晶度,这是由于同时提高了成核速度和晶体生长速度之间的良好平衡。
Stereocomplex crystallite (SC) between enantiomeric poly(l-lactic acid) (PLLA) and poly(d-lactic acid) (PDLA), with largely improved thermal resistance and mechanical properties compared with PLLA and PDLA, is a good nucleating agent for poly(lactic acid) (PLA). The effects of SC and/or polyethylene glycol (PEG) on the crystallization behaviors of PLA were investigated. The non-isothermal and isothermal crystallization kinetics revealed that SC and PEG can separately promote the crystallization rate of PLA by heterogeneous nucleation and increasing crystal growth rate, respectively. However, their promoting effect is limited when used alone, and the modified PLA cannot crystallize completely under a cooling rate of 20 °C/min. When SC and PEG are both present, the crystallization rate of PLA is greatly accelerated, and even under a cooling rate of 40 °C/min, PLA can crystallize completely and get a high crystallinity owing to the excellent balance between simultaneously improved nucleation and crystal growth rate.
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