Surface modification of poly(vinyl alcohol) fibers to control the fiber-matrix interaction in composites
Surface modification of poly(vinyl alcohol) fibers to control the fiber-matrix interaction in composites
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DOI：
10.1007/s00396-019-04528-z
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发表时间：
2019-07
影响因子：
2.4
通讯作者：
A. Drechsler;R. Frenzel;A. Caspari;S. Michel;M. Holzschuh;A. Synytska;I. Curosu;M. Liebscher;V. Mechtcherine
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文献类型：
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作者：
A. Drechsler;R. Frenzel;A. Caspari;S. Michel;M. Holzschuh;A. Synytska;I. Curosu;M. Liebscher;V. Mechtcherine
制备了具有不同酸/碱行为和润湿性的聚合物纤维，以控制纤维增强复合材料中的纤维-基体相互作用。通过醛类的化学键合和酸性、碱性聚电解质的吸附，使水不溶性高性能聚乙烯醇纤维在分子水平上具有不同的表面功能。纤维的表面敏感的方法，如X射线光电子能谱，zeta电位，和接触角的测量，其特征在于。改性导致在纤维表面上形成稳定的薄非极性层或极性酸性、碱性和两性表面官能团，去离子水的接触角在30°和90°之间。纤维-基质相互作用进行了探讨的单纤维嵌入在水泥基质和随后的形态分析的纤维的拉拔试验。极性表面功能引起了强烈的纤维基质的粘附力，而非极性，疏水表面层显着降低了粘附力。纤维的表面电荷和酸/碱行为没有显著影响。
Polymeric fibers with varied acid/base behavior and wettability were prepared to control fiber-matrix interactions in fiber-reinforced composites. Water-insoluble high-performance poly(vinyl alcohol) fibers were equipped with different surface functionalities on a molecular level by chemical bonding of aldehydes and adsorption of acidic and alkaline polyelectrolytes. The fibers were characterized by surface-sensitive methods, such as X-ray photoelectron spectroscopy, zeta potential, and contact angle measurements. The modification resulted in stable thin nonpolar layers or polar acidic, alkaline, and amphoteric surface functionalities on the fiber surface, with advancing contact angles of deionized water between 30° and 90°. Fiber-matrix interactions were probed by pullout tests of single fibers embedded in a cementitious matrix and subsequent morphological analysis of the fibers. Polar surface functionalities caused a strong fiber-matrix adhesion while nonpolar, hydrophobic surface layers decreased the adhesion dramatically. The surface charge and acid/base behavior of the fibers had no significant influence.Graphical abstract