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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Hybrid urethanesil coatings for inorganic surfaces produced by isocyanate-free and sol-gel routes: synthesis and characterization

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Author(s):
de Aguiar, K. M. F. Rossi [1] ; Ferreira-Neto, E. P. [1] ; Blunk, S. [2] ; Schneider, J. F. [3] ; Picon, C. A. [4] ; Lepienski, C. M. [2] ; Rischka, K. [5] ; Rodrigues-Filho, U. P. [1]
Total Authors: 8
Affiliation:
[1] Univ Sao Paulo, Inst Chem Sao Carlos, BR-13563120 Sao Carlos, SP - Brazil
[2] Univ Fed Parana, Dept Phys, BR-81531980 Curitiba, PR - Brazil
[3] Univ Sao Paulo, Inst Phys Sao Carlos, BR-13566590 Sao Carlos, SP - Brazil
[4] State Univ Julio de Mesquita Filho, Engn Fac, Ilha Solteira, SP - Brazil
[5] Fraunhofer Inst Mfg Technol & Adv Mat IFAM, D-28359 Bremen - Germany
Total Affiliations: 5
Document type: Journal article
Source: RSC ADVANCES; v. 6, n. 23, p. 19160-19172, 2016.
Web of Science Citations: 6
Abstract

A simple and versatile route for the preparation of self-adhesive, corrosion-resistant and photochromic hybrid coatings is presented in this paper. The coatings are based on aliphatic poly(dimethylsiloxane)-derived hydroxyurethanes (PDMSUr), produced by the isocyanate-free route for inorganic substrates such as glass and metal alloys. This route involves the ring opening polymerization of a PDMS-derived bis(cyclic carbonate) (CCPDMS) with diamines and aminosilane. The cyclic carbonate was synthesized by cycloaddition of CO2 into a PDMS diglycidyl ether. The use of aminosilanes with CCPDMS enables hybrid organic-inorganic urethanic coatings to be obtained by the sol-gel process. The crystallinity of the coating can be easily controlled through the interplay of the ratio of monoamines and diamines in the formulation. The hybrid PDMSUr materials were tested as an adhesive/coating for metallic and glazed surfaces, presenting adhesion strengths of up to 7 MPa and a maximum usage temperature of 160 degrees C. The incorporation of phosphotungstic acid (PWA) produced a hard material (20-60 MPa) and the elastic modulus rose by more than a hundred times as the PWA content increased. The hybrid PDMSUr 2\_35% PWA presented photochromic properties and is suitable as an adhesive and impact damping layer for laminated glass used for smart window production. Furthermore, these coatings are suitable for the protection of metallic substrates against corrosion in acidic, basic and seawater media. (AU)

FAPESP's process: 13/05279-3 - Poly(dimethylsiloxane) based segmented urethanes biomimetic adhesives Based on CO2 fixation
Grantee:Kelen Menezes Flores Rossi de Aguiar
Support Opportunities: Scholarships abroad - Research Internship - Doctorate
FAPESP's process: 11/08120-0 - Nanostructured films: on the influence of the architecture on Photoactivity properties of films with phosphotungstate and nanoparticles
Grantee:Ubirajara Pereira Rodrigues Filho
Support Opportunities: Regular Research Grants
FAPESP's process: 11/06019-0 - CO2 uptake and synthesis of polyuretanes-polysilicone co-polymers as additives incorporated in ormosils: use on bioactive and ion conducting films
Grantee:Kelen Menezes Flores Rossi de Aguiar
Support Opportunities: Scholarships in Brazil - Doctorate