Effect of surface molecular aggregation state and surface molecular motion on wetting behavior of water on poly(fluoroalkyl methacrylate) thin films

Koji Honda; Masamichi Morita; Osami Sakata; Sono Sasaki; Atsushi Takahara

doi:10.1021/ma901973t

Effect of surface molecular aggregation state and surface molecular motion on wetting behavior of water on poly(fluoroalkyl methacrylate) thin films

Koji Honda, Masamichi Morita, Osami Sakata, Sono Sasaki, Atsushi Takahara

Department of Applied Molecular Chemistry

Research output: Contribution to journal › Article › peer-review

128 Citations (Scopus)

Abstract

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 (R_f) groups [PFMA-C_y; y: fluoromethylene number in Rf groups, y = 1, 2, 4, 6, and 8] was characterized. The receding contact angle of PFMA-C_y with short R_f groups (y = 1,2,4, and 6) was larger than that of poly(fluoroalkyl acrylate) with short R _f groups [PFA-C_y, y ≤ 6]. This stable hydrophobicity observed for PFMA-C_y 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 R_f groups [PFMA-C_y, 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.

Original language	English
Pages (from-to)	454-460
Number of pages	7
Journal	Macromolecules
Volume	43
Issue number	1
DOIs	https://doi.org/10.1021/ma901973t
Publication status	Published - Jan 12 2010

All Science Journal Classification (ASJC) codes

Organic Chemistry
Polymers and Plastics
Inorganic Chemistry
Materials Chemistry

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title = "Effect of surface molecular aggregation state and surface molecular motion on wetting behavior of water on poly(fluoroalkyl methacrylate) thin films",

abstract = "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.",

author = "Koji Honda and Masamichi Morita and Osami Sakata and Sono Sasaki and Atsushi Takahara",

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T1 - Effect of surface molecular aggregation state and surface molecular motion on wetting behavior of water on poly(fluoroalkyl methacrylate) thin films

AU - Honda, Koji

AU - Morita, Masamichi

AU - Sakata, Osami

AU - Sasaki, Sono

AU - Takahara, Atsushi

PY - 2010/1/12

Y1 - 2010/1/12

N2 - 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.

AB - 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.

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Effect of surface molecular aggregation state and surface molecular motion on wetting behavior of water on poly(fluoroalkyl methacrylate) thin films

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