Low Modulus Dry Silicone-Gel Materials by Photoinduced Thiol–Ene Chemistry

Autor:	Fabienne Goethals, Otto van den Berg, Ceren Özdilek, Filip Du Prez, Stephane Berghmans, Roberto F. A. Teixeira, Le-Thu T. Nguyen
Rok vydání:	2014
Předmět:	chemistry.chemical_classification Materials science Polymers and Plastics Organic Chemistry Polymer Elastomer Inorganic Chemistry chemistry.chemical_compound Silicone chemistry Polymer chemistry Materials Chemistry Magic angle spinning Click chemistry Elastic modulus Curing (chemistry) Ene reaction
Zdroj:	Macromolecules. 47:1292-1300
ISSN:	1520-5835 0024-9297
DOI:	10.1021/ma402564a
Popis:	The curing behavior of telechelic vinyl-functionalized poly(dimethylsiloxane) (PDMS) with poly(dimethylsiloxane-co-propylmercaptomethylsiloxane) using photoinitiated radical thiol–ene polyaddition was studied, by means of rheology, mechanical analysis of the cured elastomeric products, and high resolution magic angle spinning NMR (HR-MAS). Postpolymerization modification of a hydroxy-functionalized PDMS-derivative (OH-PDMS) yielded a telechelic thiol-functionalized PDMS-derivative, which was subsequently used as chain extender for the preparation of dry silicone-gel materials with elastic moduli between 30 and 500 kPa. The rate of thiol–ene polyaddition of the chain extender proved to be similar to that of the cross-linking process using multifunctional PDMS-based thiols. HR-MAS analysis of the loosely cross-linked thiol–ene PDMS networks and their fluoride-solubilized counterparts proved a highly efficient cross-linking with an optimal cure at 1:1 thiol to ene stoichiometric ratios. Using mechanical anal...
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::fb5e1a13d6420a683d66e60a02e4ba30 https://doi.org/10.1021/ma402564a Zobrazit plný text záznamu