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Surface modification of poly(phenylene sulfide) using photoinitiated chlorine dioxide radical as an oxidant

Abstract

Poly(phenylene sulfide) (PPS), a high-performance engineering plastic, possesses many desirable characteristics, such as outstanding high-temperature stability, inherent flame resistance, and excellent mechanical properties. Owing to its excellent chemical resistance, the modification of PPS for further applications, such as printed circuit boards (PCBs), is difficult. In this study, a photoinitiated chlorine dioxide radical (ClO2) was utilized as an oxidant to modify the PPS film surface to improve its hydrophilicity and adhesion properties with different metals. IR and XPS analyses confirmed that oxygen-containing groups are introduced onto the PPS film surface, and its hydrophilicity is improved. Electroless plating was performed to deposit Cu and Ni metals onto the PPS surface, and the strength of adhesion between the polymer and metals was evaluated using a tape test. This novel modification method can be successfully utilized as a pretreatment for electroless plating, showing great potential for application in flexible printed circuits and the automotive industry in the future.

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Acknowledgements

This work was supported by JSPS KAKENHI Grants (Nos. 19H02778, 20H02797, 20K05606, and No. 20K15343), by the Japan Agency for Medical Research and Development under Grant Number JP20HE0622009, and by the Adaptable and Seamless Technology transfer Program through Target-driven R&D (A-STEP) of the Japan Science and Technology Agency, Grant Number JPMJTM20QE. The authors would like to thank Mr. Koji Kita and Mr. Junji Yoshikawa (Okuno Chemistry Industry) for providing metal plating reagents and their kind advice.

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ZC: Methodology, data curation, and writing original draft. Y-I H: Methodology, visualization, writing – review & editing, and funding acquisition. AK: Methodology and data curation. HA: Writing – review & editing, conceptualization, resources, and funding acquisition. T-A A: Resources, writing – review & editing, and funding acquisition. HU: Conceptualization, resources, writing – review & editing, funding acquisition, and supervision.

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Correspondence to Yu-I Hsu or Hiroshi Uyama.

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Cao, Z., Hsu, YI., Koizumi, A. et al. Surface modification of poly(phenylene sulfide) using photoinitiated chlorine dioxide radical as an oxidant. Polym J 53, 1231–1239 (2021). https://doi.org/10.1038/s41428-021-00544-5

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