ICCAS OpenIR
From cloudy to transparent: Chain rearrangement in hydrogen-bonded layer-by-layer assembled films
Yang, Shuguang; Zhang, Yongjun; Zhang, Xiaoyan; Guan, Ying; Xu, Jian; Zhang, Xiaoli
2007-02-19
Source PublicationCHEMPHYSCHEM
ISSN1439-4235
Volume8Issue:3Pages:418-424
AbstractThe cloudiness of hydrogen-bonded LBL films assembled from polyvinylpyrrolidone (PVPON) and poly(acrylic acid) (PAA) is studied in detail by two approaches: spectroscopy (Fabry-Perot fringes) and microscopy (AFM). Fabrication parameters such as temperature, molecular weight, pH value, and rinsing time, have notable influences on film cloudiness. The buildup of the PVPON/PAA film is a two-stage process of adsorption and chain rearrangement. Generally, adsorption is fast, while chain rearrangement is slow. The fast adsorption process traps defects, whereas the relatively slow chain-rearrangement process can not heal the defects in time; therefore, the number of defects continuously increases as LBL assembly proceeds, and a cloudy, heterogeneous film is produced. However, the as-prepared cloudy films become transparent and homogeneous on subsequent annealing in acidic water. UV/Vis spectroscopy and fluid AFM were applied to monitor this transition ex situ and in situ, respectively. It is found that increasing the annealing temperature accelerates the transition from cloudy to transparent, and the transition of the film made from higher molecular weight polymer is slower.
KeywordLayer-by-layer Assembly Polymers Surface Chemistry Thin Films Uv/vis Spectroscopy
DOI10.1002/cphc.200600595
Indexed BySCI
Language英语
WOS IDWOS:000244496200009
PublisherWILEY-V C H VERLAG GMBH
Citation statistics
Cited Times:20[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/62804
Collection中国科学院化学研究所
Corresponding AuthorXu, Jian
AffiliationChinese Acad Sci, Inst Chem, State Key Lab Polymer Phys & Chem, Beijing 100080, Peoples R China
Recommended Citation
GB/T 7714
Yang, Shuguang,Zhang, Yongjun,Zhang, Xiaoyan,et al. From cloudy to transparent: Chain rearrangement in hydrogen-bonded layer-by-layer assembled films[J]. CHEMPHYSCHEM,2007,8(3):418-424.
APA Yang, Shuguang,Zhang, Yongjun,Zhang, Xiaoyan,Guan, Ying,Xu, Jian,&Zhang, Xiaoli.(2007).From cloudy to transparent: Chain rearrangement in hydrogen-bonded layer-by-layer assembled films.CHEMPHYSCHEM,8(3),418-424.
MLA Yang, Shuguang,et al."From cloudy to transparent: Chain rearrangement in hydrogen-bonded layer-by-layer assembled films".CHEMPHYSCHEM 8.3(2007):418-424.
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