Molecular Chemical Structure on Poly(methyl methacrylate) (PMMA) Surface Studied by Sum Frequency Generation (SFG) Vibrational Spectroscopy
Molecular Chemical Structure on Poly(methyl methacrylate) (PMMA) Surface Studied by Sum Frequency Generation (SFG) Vibrational Spectroscopy
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DOI：
10.1021/jp013161d
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发表时间：
2001-11
影响因子：
3.3
通讯作者：
Jie Wang;Chunyan Chen;Sarah M. Buck;Zhan Chen
中科院分区：
文献类型：
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作者：
Jie Wang;Chunyan Chen;Sarah M. Buck;Zhan Chen
用和频振动光谱研究了聚甲基丙烯酸甲酯（PMMA）表面的分子化学结构。通过使用各种方法，我们已经表明，在我们的实验中收集的PMMA反射SFG光谱只来自聚合物/空气界面，而不是从聚合物/基板或本体聚合物。这些SFG光谱由来自酯甲基的振动带主导。推导了PMMA表面酯甲基的取向范围和取向分布。在PMMA表面检测到α-甲基的反对称伸缩振动带。分析表明，α-甲基基团位于表面。在SFG光谱中未观察到亚甲基。为了比较，我们还研究了聚（丙烯酸甲酯）（PMA）和丁二酸二甲酯的表面化学结构的SFG。
The molecular chemical structure of poly(methyl methacrylate) (PMMA) surface has been studied by sum frequency generation (SFG) vibrational spectroscopy. By using various methods, we have shown that reflected SFG spectra of PMMA collected in our experiments only come from the polymer/air interface, not from the polymer/substrate or the bulk polymer. These SFG spectra are dominated by the vibrational bands from the ester methyl group. Ranges of orientation and orientation distribution of the ester methyl group on the PMMA surface have been deduced. The antisymmetric stretching vibrational band of the alpha methyl group has been detected on the PMMA surface. Analysis shows that the alpha methyl groups are lying down on the surface. The methylene group has not been observed in SFG spectra. For comparison, we have also studied surface chemical structures of poly(methyl acrylate) (PMA) and dimethyl succinate by SFG.