Improved adhesion of polyurethane-based nanocomposite coatings to tin surface through silane coupling agents

Sivakumar, Preeth; Du, Surbhi Mahajan; Selter, Matt; Daye, John; Cho, Junghyun

doi:10.1016/j.ijadhadh.2021.102948

Improved adhesion of polyurethane-based nanocomposite coatings to tin surface through silane coupling agents

Journal Article · Tue Jul 06 00:00:00 EDT 2021 · International Journal of Adhesion and Adhesives

DOI:https://doi.org/10.1016/j.ijadhadh.2021.102948· OSTI ID:1843191

Sivakumar, Preeth ^[1]; Du, Surbhi Mahajan ^[2]; Selter, Matt ^[2]; Daye, John ^[2]; Cho, Junghyun ^[1]

State Univ. of New York (SUNY), Binghamton, NY (United States)
Kansas City National Security Campus (KCNSC), Kansas City, MO (United States)

Conformal coatings with higher adhesion strength is critical for mitigating the growth of whiskers from the pure tin (Sn) or Sn-rich surfaces of the Pb-free electronics. Silane coupling agents have the ability to form a durable bond between polymeric coatings and metallic materials. The main goal of this paper is to investigate the effect of silane agents on the adhesion behavior of polyurethane (PU), polyurethane acrylate (PUA) and both coatings filled with silicone rubber (SR) nanoparticles on the tin solder pads. It was found that an isocyanate-based silane provided excellent adhesion for PU and PU + SR coatings and an acrylic-based silane for PUA and PUA + SR coatings on the tin surface. This was due to the reaction bond formation between the silane coupling agent and the coating. Hence, the selection of silane coupling agents with the organofunctional group similar to the coating material is crucial to improve the adhesion properties of the coating.

View Accepted Manuscript (DOE)

Research Organization:: Kansas City Nuclear Security Campus (KCNSC), Kansas City, MO (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: NA0002839

OSTI ID:: 1843191

Alternate ID(s):: OSTI ID: 1811546

Report Number(s):: NSC-614-2926

Journal Information:: International Journal of Adhesion and Adhesives, Journal Name: International Journal of Adhesion and Adhesives Vol. 110; ISSN 0143-7496

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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