The effect of surface molecular motion on the wetting behavior of water on the thin film surfaces of poly(fluoroalkyl methacrylate)s with various fluoroalkyl (Rf) groups [PFMA-Cy; y: fluoromethylene number in Rf groups, y = 1, 2, 4, 6, and 8] was characterized. The receding contact angle of PFMA-Cy with short Rf groups (y = 1,2,4, and 6) was larger than that of poly(fluoroalkyl acrylate) with short R f groups [PFA-Cy, y ≤ 6]. This stable hydrophobicity observed for PFMA-Cy is due to the restriction of thermal molecular motion by the α-methyl group. Wide-angle X-ray diffraction (WAXD) and grazing incidence WAXD measurements revealed that the Rf groups [PFMA-Cy, y ≤ 6] were not crystallized. PFMA-C8 showed high advancing and receding contact angles due to the crystallization of fluoroalkyl groups at the surface region. The hydrophobicity of PFMA-C 8 was improved after annealing due to the ordering of fluoroalkyl groups.
All Science Journal Classification (ASJC) codes
- Organic Chemistry
- Polymers and Plastics
- Inorganic Chemistry
- Materials Chemistry