Microstructure and surface state of plasma-treated high-density polyethylene elucidated by energy-tunable positron annihilation and water contact angle measurements

Zhe Chen; Zhi Wang; Qiuming Fu; Zhibin Ma; Pengfei Fang; Chunqing He

doi:10.56646/jjapcp.2.0_011202

2nd Japan-China Joint Workshop on Positron Science (JWPS2013)

Session ID : 011202

DOI https://doi.org/10.56646/jjapcp.2.0_011202

Conference information

Host: The organizing committee of JWPS2013

Name : 2nd Japan-China Joint Workshop on Positron Science (JWPS2013)

Location : Tsukuba, Japan

Date : December 20, 2013 - December 23, 2013

Polymers, membranes, and porous media

Microstructure and surface state of plasma-treated high-density polyethylene elucidated by energy-tunable positron annihilation and water contact angle measurements

Zhe Chen, Zhi Wang, Qiuming Fu, Zhibin Ma, Pengfei Fang, Chunqing He

Author information

CONFERENCE PROCEEDINGS OPEN ACCESS

Details

Abstract

Positron gamma ray spectroscopy coupled with an energy-tunable positron beam was utilized to the study of the microstructure in polyethylene (PE) modified by the radio-frequency (RF) plasma. The energy dependence of the line-shape S parameter, a measure of the Doppler broadening of the positron radiation, confirmed that the change in the hydrophilic state of the PE surface after plasma modification was due to the altered chemical structure in the near-surface region. Moreover, only a region at a depth shallower than 700 nm was influenced by the plasma modification. The recovery in the surface hydrophobicity after plasma modification was observed through contact angle measurements. The variation of the contact angle of water can be fitted by a two-factor decay model, suggesting that the surface recovery is caused by the diffusion of two different groups.

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