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首页> 外文期刊>Journal of Applied Polymer Science >Temperature-dependent permeability of polyelectrolyte complex capsule membranes having N-isopropylacrylamide domains
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Temperature-dependent permeability of polyelectrolyte complex capsule membranes having N-isopropylacrylamide domains

机译：具有N-异丙基丙烯酰胺结构域的聚电解质复合膜的温度依赖性渗透率

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摘要

As a microcapsule with temperature sensitivity, poly(methacrylic acid)-polyethylenimine complex capsules containing N-isopropylacrylamide units were designed. Two kinds of copolymers of methacrylic acid and N-isopropylacrylamide were synthesized by free-radical copolymerization. Partly crosslinked poly(methacrylic acid)-polyethylenimine complex capsules containing the methacrylic acid-N-isopropylacrylamide copolymers were prepared at 40 or 25 degrees C. The permeation of phenylethylene glycol through the capsule membranes was investigated. Permeability of the capsules prepared at 25 degrees C increased monotonously with increasing temperature from 10 to 50 degrees C. Permeability of the capsules prepared at 40 degrees C also increased with increasing temperature up to 25 degrees C but decreased above 30 degrees C. Also, the degree of swelling of the membranes prepared at 40 degrees C decreased above 30 degrees C. Differential scanning calorimetry measurement showed that N-isopropylacrylamide units underwent more efficient transition in the capsule membranes prepared at 40 degrees C than in the membranes prepared at 25 degrees C. The capsule membranes prepared at. 40 degrees C might have domains in which N-isopropylacrylamide units are concentrated, whereas these units should distribute uniformly in the capsule membranes made at 25 degrees C. Such a difference in distribution of N-isopropylacrylamide units might result in the different permeation property of the capsule membranes. (C) 2000 John Wiley & Sons, Inc. [References: 23]
机译：作为具有温度敏感性的微胶囊，设计了含有N-异丙基丙烯酰胺单元的聚（甲基丙烯酸）-聚乙烯亚胺复合胶囊。通过自由基共聚反应合成了甲基丙烯酸和N-异丙基丙烯酰胺的两种共聚物。在40或25℃下制备含有甲基丙烯酸-N-异丙基丙烯酰胺共聚物的部分交联的聚（甲基丙烯酸）-聚乙烯亚胺复合胶囊。研究了苯基乙二醇通过胶囊膜的渗透。在25摄氏度下制备的胶囊的渗透性随温度从10升高到50摄氏度而单调增加。在40摄氏度下制备的胶囊的渗透性也随着温度升高至25摄氏度而增加，但在30摄氏度以上时降低。在40°C下制备的膜的溶胀度降低到30°C以上。差示扫描量热法测量表明，在40°C下制备的胶囊膜中，N-异丙基丙烯酰胺单元比在25°C下制备的膜具有更有效的转变。制备的胶囊膜。 40摄氏度可能会有N-异丙基丙烯酰胺单元集中的区域，而这些单元应在25摄氏度下制成的胶囊膜中均匀分布。N-异丙基丙烯酰胺单元的这种分布差异可能会导致N-异丙基丙烯酰胺单元的渗透性能不同。胶囊膜。 （C）2000 John Wiley＆Sons，Inc. [参考：23]

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