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Isobaric relaxation phenomenon of mixed PMMA/PS‐ b ‐PEO monolayers at different temperatures
Author(s) -
Jheng KaiTeng,
Hsu WenPing
Publication year - 2012
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.36828
Subject(s) - monolayer , isobaric process , materials science , relaxation (psychology) , methyl methacrylate , ethylene oxide , nucleation , polymer chemistry , poly(methyl methacrylate) , chemical engineering , thermodynamics , polymer , chemistry , copolymer , composite material , organic chemistry , nanotechnology , psychology , social psychology , physics , engineering
Abstract The objective of this research was to find out the effect of molecular weight of poly(methyl methacrylate) (PMMA) and temperature on the isobaric relaxation behaviors of mixed PMMA/poly(styrene)‐ block ‐poly(ethylene oxide) (PS‐ b ‐PEO) monolayers. Isobaric relaxation experiments of mixed monolayers of PMMA with different molecular weights and PS‐ b ‐PEO at the air/water interface were investigated at three different temperatures (10, 25, and 40°C). The PS‐ b ‐PEO monolayer was found to exhibit a fast relaxation curve (i.e., the surface area decreased significantly with increasing time). Addition of PMMA into PS‐ b ‐PEO slowed the relaxation behavior especially at the lowest experimental temperature (10°C). It was shown that the area relaxation process of mixed PMMA/PS‐ b ‐PEO monolayers could be well represented by a model considering the nucleation and growth mechanisms. The characteristic exponent x values were found to be almost temperature independent. The k x values were detected to decrease mostly as a result of temperature elevation regardless of pure or mixed monolayers. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012