TY - DATA T1 - Dynamics of Water-Induced Surface Reorganization in Poly(methyl methacrylate) Films PY - 2012/06/12 AU - Ayanobu Horinouchi AU - Hironori Atarashi AU - Yoshihisa Fujii AU - Keiji Tanaka UR - https://acs.figshare.com/articles/journal_contribution/Dynamics_of_Water_Induced_Surface_Reorganization_in_Poly_methyl_methacrylate_Films/2515198 DO - 10.1021/ma3002559.s001 L4 - https://ndownloader.figshare.com/files/4158127 KW - surface reorganization KW - dynamic KW - measurement KW - outermost KW - surface relaxation time KW - PMMA KW - methacrylate N2 - At the outermost surface, aggregation states of polymers generally tend to alter to their most stable ones in response to their surrounding environment. We here apply a time-resolved contact angle measurement to study the rate of the surface reorganization of poly­(methyl methacrylate) (PMMA) in water. By doing these measurements at various temperatures, it is possible to determine the apparent activation energy of the surface dynamics based on the relation of the surface relaxation time and temperature. Also, the sum-frequency generation spectroscopy revealed that the surface reorganization involves the conformational changes in the main chain part as well as the side chains. Hence, the dynamics observed here may reflect the segmental motion at the outermost region of the PMMA film, in which water plays as a plasticizer. ER -