Wettability of End-Grafted Polymer Brush by Chemically Identical Polymer Films

Autor:	Ophelia Kwan Chui Tsui, Fuk Kay Lee, Xueyun Zhang
Rok vydání:	2008
Předmět:	chemistry.chemical_classification Materials science Polymers and Plastics Atomic force microscopy Organic Chemistry Brush Polymer Polymer brush Grafting law.invention Inorganic Chemistry Contact angle chemistry law Homogeneous Polymer chemistry Materials Chemistry Wetting Composite material
Zdroj:	Macromolecules. 41:8148-8151
ISSN:	1520-5835 0024-9297
DOI:	10.1021/ma801549r
Popis:	Previous experiments on chemically homogeneous polymer melt−brush systems have found large deviations from theory. By using X-ray reflectivity and atomic force microscopy, we find that the equilibrium structure of these systems is complex, composed of dewetted droplets of the constituent polymers residing on a residual film of the end-grafted brush swollen by the free melt chains. When the molecular weight of the melt or the grafting density of the brush is decreased, the thickness of the residual film increases and the contact angle decreases, both indicating improved wettability. At the same time, the profile of the dewetted droplets exhibits a progressively longer and gentler tail at the ends. But a wetting−dewetting transition is never observed. By comparing the measurements to recent results of the self-consistent field theory, good quantitative agreement is found. On the other hand, Leibler’s analytical theory—which has been used almost exclusively for comparison with experiment—provides a poor desc...
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::aa0b0555f8c56d594c529c630cbad815 https://doi.org/10.1021/ma801549r Zobrazit plný text záznamu