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首页> 外文期刊>Applied Surface Science >Surface morphology of cellulose films prepared by spin coating on silicon oxide substrates pretreated with cationic polyelectrolyte
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Surface morphology of cellulose films prepared by spin coating on silicon oxide substrates pretreated with cationic polyelectrolyte

机译：通过旋涂在阳离子聚电解质预处理的氧化硅基底上制备的纤维素膜的表面形态

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摘要

Flat cellulose films were prepared and morphologically modified by spin coating a cellulose/N-methylmorpholine-N-oxide/H_2O solution onto silicon oxide substrates pre-coated with a cationic polyelectrolyte. Spin-coated cellulose films were allowed to stably form on the silicon oxide substrates by pretreatment with either polydiallyldimethylammonium chloride (PDADMAC) or polyvinylamine (PVAm). The film surfaces obtained were analyzed by X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM). AFM topographical images of the cellulose film surfaces showed a different morphology depending on the underlying polymer, where PVAm pretreatment brought about an anisotropic surface topology. These results suggest that the specific attraction acting at the cellulose/polymer interface influences both the film formation and surface morphology of the cellulose layer. Differences in the solvent used to precipitate cellulose caused variations in the surface roughness by affecting the cellulose separation behavior. The morphological features of spin-coated cellulose film surfaces could be altered to some extent by these film preparation techniques.
机译：制备平坦的纤维素膜，并通过将纤维素/ N-甲基吗啉-N-氧化物/ H_2O溶液旋涂到预先涂有阳离子聚电解质的氧化硅基质上，进行形态学改性。通过用聚二烯丙基二甲基氯化铵（PDADMAC）或聚乙烯胺（PVAm）进行预处理，可以在氧化硅衬底上稳定形成旋涂纤维素膜。通过X射线光电子能谱（XPS）和原子力显微镜（AFM）分析获得的膜表面。纤维素膜表面的AFM形貌图显示了不同的形态，具体取决于下面的聚合物，其中PVAm预处理带来了各向异性的表面拓扑。这些结果表明，作用在纤维素/聚合物界面上的比吸引力既影响膜的形成又影响纤维素层的表面形态。用于沉淀纤维素的溶剂的差异会通过影响纤维素的分离行为而导致表面粗糙度的变化。通过这些膜制备技术可以在一定程度上改变旋涂纤维素膜表面的形态学特征。

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