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Relaxation phenomena of stereoregular poly(methyl methacrylate) monolayers at the air/water interface
Author(s) -
Lee YuhLang,
Hsu WenPing
Publication year - 2007
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.27020
Subject(s) - monolayer , tacticity , methyl methacrylate , relaxation (psychology) , nucleation , materials science , inflection point , surface pressure , poly(methyl methacrylate) , polymer chemistry , glass transition , methacrylate , thermodynamics , chemical engineering , polymerization , polymer , composite material , nanotechnology , physics , psychology , social psychology , geometry , mechanics , mathematics , engineering
Relaxation behaviors of isotactic, atactic, and syndiotactic poly(methyl methacrylate) (PMMA) monolayers at the air/water interface were investigated at three different temperatures. The monolayer characteristics of the three stereoisomers were studied in terms of surface pressure–area per molecule (π‐ A ) isotherm, area relaxation, and pressure relaxation. The results show that pressures at inflection points of π‐ A isotherms of PMMA decrease with an increase in temperature. The collapse pressure also decreases as the temperature is elevated. It was shown likely for the first time that the relaxation process of PMMA stereoisomers could be described by a model considering the nucleation and growth mechanisms. The simulation parameters of area relaxation of the three stereoisomers at 30 mN/m are very similar, indicating similar mechanisms. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2008