A straightforward methodology for the synthesis of α,w-telechelic poly(dimethylsiloxane)s

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

AUSTRALIAN JOURNAL OF CHEMISTRY

CSIRO PUBLISHING

Lugar: Collingwood; Año: 2018 vol. 71 p. 160 - 169

0004-9425

In this work we report the synthesis of ,telechelic poly(dimethylsiloxane)s (α,w-PDMS) by employing a novel bifunctional initiator obtained from a commercial available siloxane precursor, poly(dimethylsiloxane) diglycidylether terminated (PDMS-DGE). The synthetic strategy involved the high-vacuum reaction of sec-BuLi+ with 1,1´-diphenylethylene (DPE) to afford the addition adduct that was subsequently reacted with PDMS-DGE, promoting the nuclephilic ring-opening from epoxide-end chains. The resulting bifunctional initiator was then employed to polymerize hexamethyl(cyclotrisiloxane) monomer (D3) by using conventional anionic polymerization. From suitable terminating agents, silane (-SiH), vinyl (-CH=CH2), hydroxyl (-OH), and even methacryloyl α,w-PDMS were obtained. From SEC analysis, narrow molar masses distributions (Mw/Mn < 1.3) and a good control over the resulting molar masses were observed. In addition, 1H-NMR and FTIR analyses confirmed the presence of the targeted functional groups in the resulting polymers.