Formation mechanism of asymmetric porous polymer films by photoinduced phase separation in the presence of solvent. Issue 34 (2nd May 2019)

• Record Type: Journal Article
• Authors: Yoshihara, Hirokazu; Yamamura, Masato
• Is Part Of: Journal of applied polymer science. Volume 136:Issue 34(2019)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2019-05-02
• Subjects: diffusion -- polymerization -- Raman spectroscopy -- UV curing; Polymers -- Periodicals; Polymerization -- Periodicals; 668.9
• DOI: 10.1002/app.47867
• Languages: English
• ISSNs: 0021-8995

Abstract

ABSTRACT: Photoinduced phase separation in the presence of a nonreactive volatile solvent provides a simple, light‐tunable, and cost‐effective route for fabrications of porous polymer films. Here, we show that the short‐time (<10 s) ultraviolet irradiation of a photoreactive solution film promotes particular asymmetries in the composition and porosity across the thickness. Confocal Raman spectroscopy revealed that the compositional asymmetry is maximum at a certain critical light intensity. We discuss the film formation mechanism based on the light‐driven diffusion of the solvent and monomer. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47867. Abstract :