Cocrystallization and phase segregation in crystalline/crystalline polymer blends of bacterial copolyesters
Cocrystallization and phase segregation in crystalline/crystalline polymer blends of bacterial copolyesters
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DOI：
10.1021/ma049858p
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发表时间：
2004-04
期刊：
影响因子：
5.5
通讯作者：
N. Yoshie;and Akeshi Asaka;Y. Inoue
中科院分区：
文献类型：
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作者：
N. Yoshie;and Akeshi Asaka;Y. Inoue
通过 FTIR 显微镜原位观察结晶和 DSC 测量熔融曲线，分析了聚（3-羟基丁酸酯-co-3-羟基戊酸酯）[PHBV] 和聚（3-羟基丁酸酯-co-3-羟基丙酸酯）[PHBP] 共混物在 80−100 °C 下的共结晶和相分离。为了通过 FTIR 显微镜分别追踪共混物组分的结晶过程，将氘代 PHBV (D-PHBV) 与普通 PHBP 混合。 IR 光谱的 CD 和 CO 伸缩带分别用于追踪 D-PHBV 和整个混合物的结晶。选择五对PHBV和PHBP来改变组分的球晶生长速率(G)及其差异。其中三个是 PHBV 的 G 值高于 PHBP 的对。它们显示出四种类型的晶相结构，具有不同程度的相偏析：完全共晶、共晶形成富含 PHBV 的共晶、相偏析形成富含 PHBV 的共晶和 PHBP ...
Cocrystallization and phase segregation in blends of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) [PHBV] and poly(3-hydroxybutyrate-co-3-hydroxypropionate) [PHBP] at 80−100 °C were analyzed through the in situ observation of crystallization by FTIR microscopy and the measurement of melting curve by DSC. To trace the crystallization process of the blend components separately by a FTIR microscope, deuterated PHBV (D-PHBV) is blended with normal PHBP. The C−D and CO stretching bands of the IR spectra are used to trace the crystallization of D-PHBV and the whole blend, respectively. Five pairs of PHBV and PHBP were selected so as to make variations in the spherulite growth rates (G) of components and their difference. Three of them are the pairs of which PHBV has a higher G than PHBP. They show four types of crystalline phase structures with various extent of phase segregation: complete cocrystallization, cocrystallization forming PHBV-rich cocrystals, phase segregation forming PHBV-rich cocrystals and PHBP ...