Evaluation of surface characteristics of polymers in water. Measurement of surface free energy in water
Evaluation of surface characteristics of polymers in water. Measurement of surface free energy in water
复制标题
评估水中聚合物的表面特性。
DOI：
10.1002/marc.1993.030140708
复制
发表时间：
1993
期刊：
影响因子：
--
通讯作者：
N. Ootsuki
中科院分区：
文献类型：
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作者：
K. Nakamae;T. Miyata;N. Ootsuki
聚合物的表面特性是独特的，聚合物表面的组成与本体相的组成不同。例如，在由两种组分组成的膜中，更疏水的组分位于表面，以使表面自由能更低。我们通过接触角测量、α-电位测量和X射线光光谱（XPS）等方法研究了各种聚合物的表面特性4-6）。我们以前的特点是在各种条件下制备的乙烯-乙烯醇（伊娃）共聚物膜的表面。通过将伊娃/二甲基亚砜溶液铺展在水上或将该溶液浇铸在具有亲水或疏水表面的各种基底上来制备伊娃膜。乙烯组分或乙烯醇组分向膜表面迁移，降低了伊娃膜与水基体之间的界面自由能。伊娃膜的表面特性可以通过膜制备条件来控制。我们还制备了含侧基单糖的共聚物膜，并研究了共聚物膜的表面性质。随着单糖含量的增加，共聚物膜变得更加亲水，蛋白质在膜上的吸附减少。当聚合物材料用于生物医学领域时，它们与各种生物分子相互作用8）。特别地，蛋白质在材料表面上的吸附是相互作用的初始阶段。因此，必须对材料的表面进行表征和控制，以达到良好的生物相容性。特别是生物医用材料在水中的表面特性非常重要，因为它们通常在湿态下使用。然而，大多数表面表征是在干燥样品和真空中进行的，例如XPS 9。'o）等，并且很难精确地表征水中的表面。
Surface characteristics of polymers are unique, and the composition of the polymer surface is different from that of the bulk phase'-3). In a film consisting of two components, for example, the more hydrophobic component is localized at the surface, to make the surface free energy lower. We have studied the surface characteristics of various polymers by contact angle measurement,<-potential measurement, and X-ray photospectroscopy (XPS), etc. 4-6). We previously characterized the surface of ethylene-vinyl alcohol (EVA) copolymer membrane prepared under various conditions. The EVA membrane was prepared by spreading an EVA/dimethyl sulfoxide solution on water or casting the solution on various substrates having hydrophilic or hydrophobic surfaces. The ethylene component or vinyl alcohol component migrated toward the membrane surface to lower the interfacial free energy between the EVA membrane and waterhbstrate. The surface characteristics of the EVA membrane could be controlled by the membrane preparation conditions. We have also prepared copolymer films with pendant monosaccharides and investigated the surface characteristics of the copolymer films' I. With increasing monosaccharide content, the copolymer films become more hydrophilic, and adsorption of protein onto the films decreases.When polymeric materials are used in biomedical fields, they interact with various biomolecules 8). Particularly, the adsorption of proteins on the materials' surface is an initial stage of the interaction. Therefore, the surface of the materials must be characterized and controlled for the purpose of good biocompatibility. Especially, the surface characteristics of biomedical materials in water are important, because they are generally used in wet state. However, most of surface characterizations are carried out on dry samples and in vacuum, such as XPS9.'o), etc., and it is difficult to characterize the surface in water exactly.