Surface characterization of plasma-modified poly(ethylene terephthalate) film surfaces
Surface characterization of plasma-modified poly(ethylene terephthalate) film surfaces
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DOI：
10.1002/polb.20234
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发表时间：
2004-10-15
影响因子：
--
通讯作者：
Miyazak, K
中科院分区：
文献类型：
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作者：
Inagaki, N;Narushim, K;Miyazak, K
用Ar、O-2、H-2、N-2和NH_3等离子体对聚对苯二甲酸乙二酯(PET)薄膜表面进行了改性，并用扫描探针显微镜、接触角测量和X射线光电子能谱对改性后的PET薄膜表面进行了表征。将PET薄膜表面暴露在等离子体中，导致了表面的刻蚀过程和表面形貌的变化。刻蚀速率和表面粗糙度与所使用的等离子体种类以及输入到等离子体的射频功率有密切关系。刻蚀速率为O-2等离子体>；H-2等离子体>；N-2等离子体>；Ar等离子体>；NH3等离子体；表面粗糙度为NH3等离子体>；N-2等离子体>；H-2等离子体>；Ar等离子体>；O-2等离子体。大量的刻蚀反应并不总是导致表面粗糙度的大幅增加。等离子体还导致PET表面性质由疏水转变为亲水，表面水的接触角减小。在PET表面上发生的改性反应取决于用于改性的等离子体。O-2、Ar、H-2和N-2等离子体主要修饰PET聚合物链上的CH3或苯环，而不是酯基，以形成C-O基团。另一方面，NH3等离子体修饰的酯基形成C-O基团。等离子体改性后的PET薄膜表面的老化效应在改性完成后持续了15天。老化效应与酯残基中的C=O基团向最上层移动和C-O基团远离最上层有关。C=O基团的这种移动可以发生在距离表面至少3 nm的范围内。(C)2004年威利期刊公司。
Poly(ethylene terephthalate) (PET) film surfaces were modified by argon (Ar), oxygen (O-2), hydrogen (H-2), nitrogen (N-2), and ammonia (NH3) plasmas, and the plasma-modified PET surfaces were investigated with scanning probe microscopy, contact-angle measurements, and X-ray photoelectron spectroscopy to characterize the surfaces. The exposure of the PET film surfaces to the plasmas led to the etching process on the surfaces and to changes in the topography of the surfaces. The etching rate and surface roughness were closely related to what kind of plasma was used and how high the radio frequency (RF) power was that was input into the plasmas. The etching rate was in the order of O-2 plasma > H-2 plasma > N-2 plasma > Ar plasma > NH3 plasma, and the surface roughness was in the order of NH3 plasma > N-2 plasma > H-2 plasma > Ar plasma > O-2 plasma. Heavy etching reactions did not always lead to large increases in the surface roughness. The plasmas also led to changes in the surface properties of the PET surfaces from hydrophobic to hydrophilic; and the contact angle of water on the surfaces decreased. Modification reactions occurring on the PET surfaces depended on what plasma had been used for the modification. The O-2, Ar, H-2, and N-2 plasmas modified mainly CH3 or phenyl rings rather than ester groups in the PET polymer chains to form C-O groups. On the other hand, the NH3 plasma modified ester groups to form C-O groups. Aging effects of the plasma-modified PET film surfaces continued as long as 15 days after the modification was finished. The aging effects were related to the movement of C=O groups in ester residues toward the topmost layer and to the movement of C-O groups away from the topmost layer. Such movement of the C=O groups could occur within at least 3 nm from the surface. (C) 2004 Wiley Periodicals, Inc.