Abstract
AbstractThe 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 kx 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
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