Study on Phase Transformation Behavior of Strain-induced PLLA Mesophase by Polarized Infrared Spectroscopy
Study on Phase Transformation Behavior of Strain-induced PLLA Mesophase by Polarized Infrared Spectroscopy
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偏光红外光谱研究应变诱导PLLA中间相相变行为
DOI：
10.1007/s10118-019-2184-5
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发表时间：
2019
影响因子：
4.3
通讯作者：
Zhang Jian-Ming
中科院分区：
文献类型：
--
作者：
Hu Jian;Han Li-Li;Zhang Tong-Ping;Duan Yong-Xin;Zhang Jian-Ming
用差示扫描量热法（DSC）和原位温度依赖的偏振傅里叶变换红外光谱（FTIR）研究了应变诱导聚L-乳酸（PLLA）从中间相到结晶相的结构转变。研究发现，随着拉伸温度的升高，应变诱导中间相在加热过程中的熔化会显著影响随后的晶化行为。在原位极化FTIR中，从60 °C到76 °C，中间相部分熔化而不是完全熔化，并立即变为三维有序结构。特别值得注意的是，通过监测临界相变温度从60 °C到64 °C的细微光谱变化，清楚地表明取向的无定形链的松弛最初发生在中间相熔融之前。
The structural transformation of mesophase to crystalline phase of strain-induced poly(L-lactic acid) has been investigated by differential scanning calorimetry (DSC) andin situtemperature dependent polarized Fourier transform infrared (FTIR) spectroscopy. It is found that, as the drawing temperature increases, melting of strain-induced mesophase in the heating process can remarkably interfere the crystallization behavior subsequently. Coupling within situpolarized FTIR, from 60 °C to 76 °C, the mesophase melts partially rather than completely melting, and changes immediately to three-dimensional ordered structure. Of particular note, through monitoring the subtle spectral change in the critical phase transformation temperature from 60 °C to 64 °C, it is clearly demonstrated that relaxation of oriented amorphous chains initially takes place prior to the melting of mesophase.