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Adhesion of Injection Molded PVC to Silane Primed Steel

Shah, Pranjal Kiran
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1122319669

Abstract Details

2005, MS, University of Cincinnati, Engineering : Materials Science.
Interactions occurring at the interface between injection molded poly (vinyl chloride) (PVC) and steel substrates that were coated with thin films of aminosilanes were investigated by X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FTIR). The silane films were formed by adsorption of γ-aminopropyltriethoxysilane (γ-APS) or N-(2-aminoethyl-3-aminopropyl) trimethoxysilane (γ-AEAPS) from 2% aqueous solutions onto polished steel substrates. PVC was injection molded onto the silane primed steel substrates and annealed at temperatures up to 170°C for times as long as 30 minutes. PVC was peeled off of the primed steel substrates using a 90° peel test and the substrate failure surfaces were thoroughly rinsed with tetrahydrofuran (THF) and distilled water to remove PVC and other compounds that were not strongly bonded to the substrates. The PVC failure surfaces were characterized by attenuated total reflection infrared spectroscopy (ATR) while PVC rinsed off of the substrate failure surfaces was characterized by transmission infrared spectroscopy. The resulting transmission and ATR spectra showed an absorption band near 1650 cm-1 that was attributed to unsaturation in PVC. The substrate failure surfaces were characterized by XPS; curve-fitting of N(1s) and Cl(2p) high resolution spectra showed the formation of amine hydrochloride complexes by protonation of amino groups of the silanes with HCl that was liberated from PVC during the onset of thermal dehydrochlorination. Furthermore, quaternization or nucleophilic substitution of labile pendent allylic chloride groups by amino groups on the silanes took place, thus grafting PVC onto the aminosilanes. It was determined that PVC having β-chloroallyl groupings along its chains showed better adhesion with steel primed with aminosilanes and that generation of allylic chloride groups in PVC chains was the rate limiting step in the reaction between PVC and aminosilane. The effect of crosslinking of silane films on adhesion between PVC and aminosilane primed steel was investigated and it was concluded that interdiffusion of the polymer phase and the silane phase was also critical in obtaining good adhesion.
Dr. James Boerio (Advisor)
102 p.
Polyvinylchloride; Silanes; c-Aminopropyltriethoxysilane; N-(2-aminoethyl-; 3-aminopropyl)trimethoxysilane; X-ray photoelectron spectroscopy; Fourier-transform; infrared spectroscopy; Peel tests; Dehydrochlorination

Recommended Citations

Citations

  • Shah, P. K. (2005). Adhesion of Injection Molded PVC to Silane Primed Steel [Master's thesis, University of Cincinnati]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1122319669

    APA Style (7th edition)

  • Shah, Pranjal. Adhesion of Injection Molded PVC to Silane Primed Steel. 2005. University of Cincinnati, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ucin1122319669.

    MLA Style (8th edition)

  • Shah, Pranjal. "Adhesion of Injection Molded PVC to Silane Primed Steel." Master's thesis, University of Cincinnati, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1122319669

    Chicago Manual of Style (17th edition)

ucin1122319669
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© 2005, all rights reserved.
This open access ETD is published by University of Cincinnati and OhioLINK.