A Straightforward Methodology for the Synthesis of a,v-Telechelic Poly(dimethylsiloxane)s

LENCINA, MARÍA M. SOLEDAD; REDONDO, FRANCO L.; MÜLLER, CAMILA; HANAZUMI, VIVINA; VITALE, CRISTIAN; NINAGO, MARIO D.; VEGA, DANIEL A.; VILLAR, MARCELO A.; CIOLINO, ANDRÉS E.

AUSTRALIAN JOURNAL OF CHEMISTRY

CSIRO PUBLISHING

Año: 2018 vol. 71 p. 160 - 169

0004-9425

In this work we report the synthesis of a,v-telechelic poly(dimethylsiloxane)s (a,v-PDMS) by employing a novel bifunctional initiator obtained from a commercially available siloxane precursor, diglycidylether-terminated poly(dimethylsiloxane) (PDMS-DGE). The synthetic strategy was easily followed by different colour changes, and involved the high-vacuum reaction of sec-BuLi with 1,10-diphenylethylene (DPE) to afford the addition adduct (bright red) thatwas subsequently reacted with PDMS-DGE, promoting the nuclephilic ring-opening from epoxide-end chains. The resulting bifunctional initiator (light green) was then employed to polymerize hexamethyl(cyclotrisiloxane) monomer (D3) by using conventional anionic polymerization (from light green to pale yellow). From suitable terminating agents,silane (SiH), vinyl (CH=CH2), hydroxy (OH), and even methacryloyl a,v-PDMS were obtained. 1H NMR and FT-IR analyses confirmed the presence of the targeted functional groups in the resulting polymers. However, a careful siliconization procedure should be performed over glass surfaces during the fractionation of chlorosilane ampoules in order to avoid the presence of silanol moieties that decrease end-capping efficiency. This fact was observed not only from NMR but also from size exclusion chromatography (SEC) analyses, since narrow molar masses distributions (1.15