STUDY ON THE SURFACE PROPERTIES OF MOLECULAR DEPOSITION (MD) FILMS CONSTRUCTED BY POLYELECTROLYTES (PSS/PDDA) ON QUARTZ SUBSTRATES

GAO Manglai; CHEN Gang; ZHANG Hua

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STUDY ON THE SURFACE PROPERTIES OF MOLECULAR DEPOSITION (MD) FILMS CONSTRUCTED BY POLYELECTROLYTES (PSS/PDDA) ON QUARTZ SUBSTRATES

Research Article | 更新时间：2021-03-19

- STUDY ON THE SURFACE PROPERTIES OF MOLECULAR DEPOSITION (MD) FILMS CONSTRUCTED BY POLYELECTROLYTES (PSS/PDDA) ON QUARTZ SUBSTRATES
- Acta Polymerica Sinica Issue 6, Pages: 837-840(2003)
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- Published：20 December 2003，
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GAO Manglai, CHEN Gang, ZHANG Hua. STUDY ON THE SURFACE PROPERTIES OF MOLECULAR DEPOSITION (MD) FILMS CONSTRUCTED BY POLYELECTROLYTES (PSS/PDDA) ON QUARTZ SUBSTRATES. [J]. Acta Polymerica Sinica (6):837-840(2003)
DOI：

GAO Manglai, CHEN Gang, ZHANG Hua. STUDY ON THE SURFACE PROPERTIES OF MOLECULAR DEPOSITION (MD) FILMS CONSTRUCTED BY POLYELECTROLYTES (PSS/PDDA) ON QUARTZ SUBSTRATES. [J]. Acta Polymerica Sinica (6):837-840(2003) DOI：

摘要

PSS/PDDAMD膜紫外-可见吸光度与层数呈线性关系

其延长线基本为零证实了是一单分子层层状沉积过程 ;利用接触角测量仪跟踪MD膜沉积过程

其结果表明

层数较少时PSS/PDDAMD膜表面润湿性呈“奇-偶”性规律变化

层数较多时规律性不明显

这说明聚电解质MD膜结构缺陷随着层数的增加有增大趋势;通过对原子力显微镜 (AFM)测定结果的分析

进一步证实了多层PSS/PDDAMD膜存在结构缺陷.

Abstract

The linear relationship between UV-absorbance of poly(styrene sulfonate)(PSS)／poly(diallyldimethyl ammonium choloride)(PDDA) and the number of MD films confirms that PSS／PDDA monolayers are alternately deposited. The contact angle of water on polyelectrolyte MD films indicates that the surface wettability varies with the number of deposited layers exhibiting a regular odd-even effect

when the number is low．This regularity becomes not obvious when more layers are deposited. This phenomenon shows that the structural defect of polyelectrolyte MD films aggravates with the increment of the number of layers．Through analyzing Atomic Force Microscopy (AFM) images of PSS／PDDA MD films

granular protrusion of about 1.5 nm height can be detected．It indicates that the surface of MD films is rough．This means that molecules of adjoining layers can penetrate into each other and form unclear interface. The results of AFM further verify the uneven surface properties and structural defect of the 20th layer of a PSS/PDDA MD film.

关键词

聚苯乙烯磺酸钠(PSS)聚二烯丙基二甲基氯化铵(PDDA)分子沉积(MD)膜表面性质

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