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Title: Hybrid organic-inorganic network coatings for protecting metal substrates from abrasion and corrosion

Abstract

Ceramers or Ormocers are hybrid organic-inorganic materials first created a decade ago, and are the subject of a recent review article. Recent research from the authors laboratory in this area of materials science has focused on synthesizing protective coatings for (soft) polymeric substrates, i.e. polycarbonate. The authors have now extended the application of such coatings to metallic substrates.

Authors:
;  [1]
  1. Virginia Polytechnic Inst. and State Univ., Blacksburg, VA (United States)
Publication Date:
OSTI Identifier:
441491
Report Number(s):
CONF-960214-
TRN: 96:006556-0024
Resource Type:
Conference
Resource Relation:
Conference: 19. annual meeting of the Adhesion Society, Inc, Myrtle Beach, SC (United States), 18-21 Feb 1996; Other Information: PBD: 1996; Related Information: Is Part Of Proceedings of the 19th annual meeting of the Adhesion Society; Ward, T.C. [ed.]; PB: 567 p.
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; STEELS; SURFACE COATING; ALUMINIUM; PROTECTIVE COATINGS; SYNTHESIS; PERFORMANCE; CERAMICS; COMPOSITE MATERIALS

Citation Formats

Jordens, K., and Wilkes, G. Hybrid organic-inorganic network coatings for protecting metal substrates from abrasion and corrosion. United States: N. p., 1996. Web.
Jordens, K., & Wilkes, G. Hybrid organic-inorganic network coatings for protecting metal substrates from abrasion and corrosion. United States.
Jordens, K., and Wilkes, G. 1996. "Hybrid organic-inorganic network coatings for protecting metal substrates from abrasion and corrosion". United States. doi:.
@article{osti_441491,
title = {Hybrid organic-inorganic network coatings for protecting metal substrates from abrasion and corrosion},
author = {Jordens, K. and Wilkes, G.},
abstractNote = {Ceramers or Ormocers are hybrid organic-inorganic materials first created a decade ago, and are the subject of a recent review article. Recent research from the authors laboratory in this area of materials science has focused on synthesizing protective coatings for (soft) polymeric substrates, i.e. polycarbonate. The authors have now extended the application of such coatings to metallic substrates.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 1996,
month =
}

Conference:
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  • Novel abrasion resistant coatings have been successfully prepared by the sol-gel method. These materials are spin coated onto bisphenol-A polycarbonate, diallyl diglycol carbonate resin (CR-39) sheet, aluminum, and steel substrates and are thermally cured to obtain a transparent coating of a few microns in thickness. Following the curing, the abrasion resistance is measured and compared with an uncoated control. It was found that these hybrid organic/inorganic networks partially afford excellent abrasion resistance to the polycarbonate substrates investigated. In addition to having excellent abrasion resistance comparable to current commercial coatings, some newly developed systems are also UV resistant. Similar coating formulationsmore » applied to metals can greatly improve the abrasion resistance despite the fact that the coatings are lower in density than their substrates.« less
  • Attempts to synthesize hybrid materials from polytetramethylene oxide (PTMO) end-functionalized with triethoxy silyl groups and, tetraethylorthosilicate (TEOS) under basic conditions met with only partial success. The films obtained had low mechanical stability. In contrast, films with good mechanical stability were obtained when the TEOS was replaced with tritanium tetraisopropoxide (TIOPR). The microstructure of the TIOPR/PTMO hybrid synthesized under near neutral conditions was generally similar to the acid catalyzed PTMO/TIOPR hybrids. In another closely related study, the effect of subjecting acid catalyzed hybrid materials to aqueous and basic solutions was examined. Two chemically different systems were chosen which were namely themore » PTMO-TEOS system and the PTMO-TIOPR system. In addition to the difference in the reactivity between the TEOS and TIOPR, another point of differentiation was the relative solubility of the silicon oxide in basic aqueous solutions in contrast to the relative insolubility of the titanium oxide species in all but the very concentrated basic solutions. An application of the hybrid materials in the area of abrasion resistant coatings was also studied. The effects of the various organic structures on abrasion resistance, the extent of reaction and the mechanism of abrasion was examined. Various low molecular weight organics were functionalized triethoxy silyl groups and coated on polycarbonate and cured. They were then subjected to a Taber abrader test. The results showed that all the functionalized organics showed better abrasion resistance than the polycarbonate if sufficiently cured. NMR data showed that the reaction of the functionalized coatings was limited by vitrification and the extent of reaction was influenced by the basicity of the organic backbone. SEM observations of the abraded surfaces showed that the polycarbonate was abraded by a mechanism different from the functionalized coatings.« less
  • The synthesis of transparent hybrid organic-inorganic coatings obtained from condensation between alkoxysilane containing grafted dyes (azo dyes or phthalocyanines) and metal alkoxides precursors has been performed. The Red 17 azo dye, known for its high second order polarizability, was bonded to the silicon oxide network following two procedures: a silylation reaction between Red 17 and triethoxysilane; a coupling reaction between Red 17 and 3-isocyanatopropyltriethoxysilane. Silicon phthalocyanines (known for their third order polarizability and inverse saturable absorption properties) were incorporated into the silicon oxide network by a silylation reaction. Phthalocyanine doped transparent hybrid organic-inorganic coatings were obtained from condensation between diethoxymethylsilanemore » and zirconium propoxide precursors.« less
  • Three novel organic-inorganic hybrid borotungstates {l_brace}[Ni(phen){sub 2}(H{sub 2}O)]{sub 2}H(alpha-BW{sub 12}O{sub 40}){r_brace}.4H{sub 2}O (1), [Cu{sup I}(2,2'-bipy)(4,4'-bipy){sub 0.5}]{sub 2}{l_brace}[Cu{sup I}(2,2'-bipy)]{sub 2}Cu{sup I}(4,4'-bipy){sub 2} (alpha-BW{sub 12}O{sub 40}){r_brace} (2) and {l_brace}[Cu{sup I}(4,4'-bipy)]{sub 3}H{sub 2}(alpha-BW{sub 12}O{sub 40}){r_brace}.3.5H{sub 2}O (3) (phen=1,10-phenanthroline, 2,2'-bipy=2,2'-bipyridine, 4,4'-bipy=4,4'-bipyridine) have been hydrothermally synthesized and structurally characterized by elemental analyses, IR, UV spectra, powder X-ray diffraction (PXRD), thermogravimetric analysis (TGA), single-crystal X-ray diffraction, X-ray photoelectron spectroscopy (XPS) and photoluminescence. The structural analysis reveals that 1 consists of a 0-D bisupporting polyoxometalate cluster where two [Ni(phen){sub 2}(H{sub 2}O)]{sup 2+} cations are grafted on the polyoxoanion [alpha-BW{sub 12}O{sub 40}]{sup 5-} through two terminal oxygen atoms,more » 2 shows a 1-D infinite chain constructed from [alpha-BW{sub 12}O{sub 40}]{sup 5-} polyoxoanions and {l_brace}[Cu{sup I}(2,2'-bipy)]{sub 2}Cu{sup I}(4,4'-bipy){sub 2}{r_brace}{sup 3+} cations by means of alternating fashion, and 3 displays an unprecedented 2D extended structure built by [alpha-BW{sub 12}O{sub 40}]{sup 5-} polyoxoanions and -Cu{sup I}-4,4'-bipy- linear chains, in which each [alpha-BW{sub 12}O{sub 40}]{sup 5-} polyoxoanion acts as a tetradentate inorganic ligand and provides three terminal oxygen atom and one two-bridging oxygen atom. The presence of Ni{sup II} and W{sup VI} in 1, Cu{sup I} ions and W{sup VI} in 2 and 3 are identified by XPS spectra. The photoluminescence of 2 and 3 are also investigated. - Graphical abstract: Three novel organic-inorganic hybrid borotungstates {l_brace}[Ni(phen){sub 2}(H{sub 2}O)]{sub 2}H(alpha-BW{sub 12}O{sub 40}){r_brace}.4H{sub 2}O (1), [Cu{sup I}(2,2'-bipy) (4,4'-bipy){sub 0.5}]{sub 2}{l_brace}[Cu{sup I}(2,2'-bipy)]{sub 2}Cu{sup I}(4,4'-bipy){sub 2}(alpha-BW{sub 12}O{sub 40}){r_brace} (2) and {l_brace}[Cu{sup I}(4,4'-bipy)]{sub 3}H{sub 2}(alpha-BW{sub 12}O{sub 40}){r_brace}.3.5H{sub 2}O (3) have been hydrothermally synthesized and structurally characterized by single-crystal X-ray diffraction, thermogravimetric analyses, X-ray photoelectron spectroscopy and photoluminescence.« less
  • Surfaces of fabricated structures are protected from damage by impacting particulates by a coating of hard material formed as a mass of thin flexible filaments having root ends secured to the surface and free portions which can flex and overlap to form a resilient cushioning mat which resembles hair or fur. The filamentary coating covers the underlying surface with hard abrasion resistance material while also being compliant and capable of local accommodation to particle impacts. The coating can also function as thermal and/or acoustical insulation and has a friction reducing effect. 11 figs.