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Artículo

A Straightforward Methodology for the Synthesis of α,ω-Telechelic Poly(dimethylsiloxane)s

Lencina, María Malvina SoledadIcon ; Redondo, Franco LeonardoIcon ; Müller, CamilaIcon ; Hanazumi, VivinaIcon ; Vitale, Cristian AlejandroIcon ; Ninago, Mario DanielIcon ; Vega, Daniel AlbertoIcon ; Villar, Marcelo ArmandoIcon ; Ciolino, Andrés EduardoIcon
Fecha de publicación: 30/01/2018
Editorial: Csiro Publishing
Revista: Australian Journal of Chemistry
ISSN: 0004-9425
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Ingeniería de los Materiales; Físico-Química, Ciencia de los Polímeros, Electroquímica

Resumen

In this work we report the synthesis of α,ω-telechelic poly(dimethylsiloxane)s (α,ω-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-Bu-Li+ with 1,1′-diphenylethylene (DPE) to afford the addition adduct (bright red) that was 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 α,ω-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 ≤ Mw/Mn ≤ 1.3) and a good control over the resulting molar masses were observed.
Palabras clave: PDMS , a-w-telechelic poly(dimethylsiloxane) , Synthesis
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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/86835
URL: http://www.publish.csiro.au/ch/CH17508
DOI: http://dx.doi.org/10.1071/CH17508
Colecciones
Articulos(IFISUR)
Articulos de INSTITUTO DE FISICA DEL SUR
Articulos(INTEMA)
Articulos de INST.DE INV.EN CIENCIA Y TECNOL.MATERIALES (I)
Articulos(PLAPIQUI)
Articulos de PLANTA PILOTO DE INGENIERIA QUIMICA (I)
Citación
Lencina, María Malvina Soledad; Redondo, Franco Leonardo; Müller, Camila; Hanazumi, Vivina; Vitale, Cristian Alejandro; et al.; A Straightforward Methodology for the Synthesis of α,ω-Telechelic Poly(dimethylsiloxane)s; Csiro Publishing; Australian Journal of Chemistry; 71; 2-3; 30-1-2018; 160-169
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