Issue 11, 2011

Surface segregation of poly(2-methoxyethyl acrylate) in a mixture with poly(methyl methacrylate)

Abstract

Poly(2-methoxyethyl acrylate) (PMEA) exhibits excellent blood compatibility. To understand why such a surface functionality exists, the surface of PMEA should be characterized in detail, structurally and dynamically, under not only ambient conditions, but also in water. However, a thin film of PMEA supported on a solid substrate can be easily broken, namely it is dewetted. Our strategy to overcome this difficulty is to mix PMEA with poly(methyl methacrylate) (PMMA). Differential scanning calorimetry and cloud point measurements revealed that the PMEA/PMMA blend has a phase diagram with a lower critical solution temperature. The blend surface was also characterized by X-ray photoelectron spectroscopy in conjunction with microscopic observations. Although PMEA is preferentially segregated over PMMA at the blend surface due to its lower surface free energy, the extent of segregation in the as-prepared films was not sufficient to cover the surface. Annealing the blend film at an appropriate temperature, higher than the glass transition temperature and lower than the phase-separation temperature of the blend, enabled us to prepare a stable and flat surface that was perfectly covered with PMEA.

Graphical abstract: Surface segregation of poly(2-methoxyethyl acrylate) in a mixture with poly(methyl methacrylate)

Article information

Article type
Paper
Submitted
10 Oct 2010
Accepted
16 Dec 2010
First published
18 Jan 2011

Phys. Chem. Chem. Phys., 2011,13, 4928-4934

Surface segregation of poly(2-methoxyethyl acrylate) in a mixture with poly(methyl methacrylate)

T. Hirata, H. Matsuno, M. Tanaka and K. Tanaka, Phys. Chem. Chem. Phys., 2011, 13, 4928 DOI: 10.1039/C0CP02101F

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