Miscibility and hydrogen-bonding interactions in biodegradable polymer blends of poly(3-hydroxybutyrate) and a partially hydrolyzed poly(vinyl alcohol)
Miscibility and hydrogen-bonding interactions in biodegradable polymer blends of poly(3-hydroxybutyrate) and a partially hydrolyzed poly(vinyl alcohol)
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DOI：
10.1021/jp0532162
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发表时间：
2005-10-20
影响因子：
3.3
通讯作者：
Ozaki, Y
中科院分区：
文献类型：
--
作者：
Huang, H;Hu, Y;Ozaki, Y
采用傅里叶变换红外光谱（FTIR）和差示扫描量热法（DSC）研究了聚3-羟基丁酸酯（PHB）与80%水解聚乙烯醇（PVA80）共混物的混溶性、氢键相互作用以及形态特性。结果表明，PHB与PVA80在整个组成范围内均处于非晶相。PVA80和PHB在共混物中的含量分别低于30%和20%时呈非晶态。由于PVA80和PHB的C=O拉伸带有大量重叠，且OH拉伸带区域的峰移无法测量，因此在室温下无法检测到PVA80的OH基团与PHB的C=O基团之间的氢键相互作用，但在180℃的高温下可以观察到。这是因为在这两种结晶聚合物的熔点以上，氢键相互作用得到了促进。通过增加混合熵和减少δ chi效应。PHB与PVA80共混对PVA80的氢键OH基团没有明显影响。相反，PHB的C=O基团剥夺了与PVA80的C=O基团形成氢键的OH基团，这导致PVA80与PHB在非晶相中发生混溶。
Miscibility and hydrogen-bonding interactions, as well as the morphological properties, of biodegradable polymer blends of poly(3-hydroxybutyrate) (PHB) and a 80% hydrolyzed poly(vinyl alcohol) (PVA80) were studied using Fourier transform infrared spectroscopy (FTIR) and differential scanning calorimetry (DSC). It was found that PHB is miscible with PVA80 in the amorphous phase over the whole composition range. PVA80 or PHB assumes the amorphous state when its content in the blend is lower than 30 or 20 wt %, respectively. Due to the heavy overlapping of C=O stretching bands from both PVA80 and PHB and the nonmeasurable peak shift in the OH stretching band region, hydrogen-bonding interactions between the OH group of PVA80 and the C=O group of PHB were not detectable at room temperature, but were observed at a higher temperature of 180 degrees C. This is because hydrogen-bonding interactions are promoted above the melting points of these two crystalline polymers, by increasing the mixing entropy and reducing the Delta chi effect. Blending PHB with PVA80 does not have a significant effect on the OH groups of PVA80 that are hydrogen bonded with each other. Instead, the C=O groups of PHB dispossess some of the OH groups that are hydrogen bonded to the C=O groups of PVA80, which gives rise to the miscibility between PVA80 and PHB in the amorphous phase.