A new route of manipulation of poly(L-lactic acid) crystallization by self-assembly of p-tert-butylcalix[8]arene and toluene
A new route of manipulation of poly(L-lactic acid) crystallization by self-assembly of p-tert-butylcalix[8]arene and toluene
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DOI：
10.1002/polb.22014
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发表时间：
2010-06
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影响因子：
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通讯作者：
Liang Wen;Z. Xin;Dongkang Hu
中科院分区：
文献类型：
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作者：
Liang Wen;Z. Xin;Dongkang Hu
采用对叔丁基杯[8]芳烃（TBC 8）和甲苯自组装的新型成核剂（TBC 8-t）来控制聚L-乳酸（PLLA）的结晶行为。利用甲苯分子调节TBC 8的结晶结构。差示扫描量热法（DSC）结果表明，TBC 8-t成核PLLA的结晶峰温度（Tc）和结晶速率（ΔHc/时间）分别为132.3 °C和0.24 J/gs，远高于常规成核剂滑石粉的结晶峰温度（Tc = 119.3 °C，ΔHc/时间= 0.13 J/gs）。偏光显微镜观察结果表明，TBC 8-t对PLLA的结晶速率有明显的促进作用，其作用机理是通过提高PLLA的成核速率而不是晶体生长速率。沿着结晶速率的提高，TBC 8-t对PLLA的结晶形态也有影响。TBC 8-t的加入使大部分原始球晶转变为束状晶体。© 2010 Wiley Periodicals，Inc.聚合物科学杂志B部分：聚合物物理48：1235-1243，2010
A novel nucleating agent (TBC8-t), self-assembled with p-tert-butylcalix[8]arene (TBC8) and toluene, was used to manipulate the crystallization behavior of poly(L-lactic acid) (PLLA). Toluene molecules were used to adjust the crystallization structure of TBC8. Differential scanning calorimetry results show that the crystallization peak temperature (Tc) and crystallization rate (ΔHc/time) of PLLA nucleated with TBC8-t are 132.3 °C and 0.24 J/gs, respectively, which are much higher than that with conventional nucleating agent-talc (Tc = 119.3 °C, ΔHc/time = 0.13 J/gs). The results of polarized optical microscopy demonstrate that TBC8-t could greatly enhance the crystallization rate of PLLA by increasing the nucleation rate rather than crystal growth rate. Along with an improvement of the crystallization rate, the crystalline morphology of PLLA is also affected by TBC8-t. The addition of TBC8-t transforms most of the original spherulite crystals into sheaf-like crystals. © 2010 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 48: 1235–1243, 2010