Crystallization behavior of poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) studied by 2D IR correlation spectroscopy
Crystallization behavior of poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) studied by 2D IR correlation spectroscopy
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DOI：
10.1016/j.polymer.2004.08.046
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发表时间：
2004-09
期刊：
影响因子：
4.6
通讯作者：
Adchara Padermshoke;Harumi Sato;Yukiteru Katsumoto;S. Ekgasit;I. Noda;Y. Ozaki
中科院分区：
文献类型：
--
作者：
Adchara Padermshoke;Harumi Sato;Yukiteru Katsumoto;S. Ekgasit;I. Noda;Y. Ozaki
通过二维红外（2D IR）相关光谱研究了聚（3-羟基丁酸酯-co-3-羟基己酸酯）（P（HB-co-HHx））（HHx=12mol%）的结晶行为。三种结晶；研究了熔体的逐渐冷却、过冷熔体的等温结晶以及溶液流延薄膜的等温结晶。详细分析了三种不同类型的结晶过程中发生的晶体生长步骤的顺序。由CO伸缩带区域的动态红外光谱生成的异步二维相关光谱表明，在逐渐冷却结晶过程中，高度有序晶体的发展发生在低有序晶体的发展之前。另一方面，对于过冷熔体和溶液流延薄膜结晶，较低有序晶体的形成先于高度有序晶体的形成。从非晶相到有序度较低的晶体的转变是所有三种类型结晶的同时过程。
Crystallization behavior of poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) (P(HB-co-HHx)) (HHx=12mol%) was studied by means of two-dimensional infrared (2D IR) correlation spectroscopy. Three types of crystallization; the gradual cooling from the melt, the isothermal crystallization of the supercooled melt, and the isothermal crystallization of the solution-cast film were investigated. The order of crystal growth steps taking place during the three different types of crystallization processes was analyzed in detail. It was revealed by the asynchronous 2D correlation spectra generated from the dynamic IR spectra in the CO stretching band region that the development of the highly ordered crystals occurs prior to that of the less ordered crystals for the gradual cooling crystallization. On the other hand, for the supercooled melt and solution-cast film crystallization, the formation of the less ordered crystals takes place before that of the highly ordered crystals. The transition from the amorphous phase to the less ordered crystals is a simultaneous process for all three types of crystallization.