Poly(urethanes) Containing Silarylene and/or Germarylene Units

Terraza, Claudio; Tagle, Hernan; Leiva, Angel; Poblete, Laura; Concha, Francisco

Keywords: silicon, germanium, thermal stability, glass transition temperature, glass transition, poly(urethanes), polyurethanes

Abstract

A series of 10 poly(urethanes) were synthesized by solution polymerization from bis(chloroformates) and aromatic diamines, containing both silicon or germanium as central atom. So, the polymers prepared contain two silicon atoms or two germanium atoms exclusively or combinations of both. Me, Et, and Ph groups were bonded to the central atoms according to the nature of the monomers employed. Poly(urethanes) were characterized by FTIR, 1H, 13C, and 29Si NMR spectroscopy and the results agreed with the proposed structures. Additionally, intrinsic viscosity values were established in DMSO solutions and thermal analyses were developed. In all cases, thermostable oligomers were obtained, which showed a degradation process beginning at 240–260 ºC. Polymers showed a thermal dependence with the nature of the heteroatom employed. Thus, in general, when germanium was used as central atom, the thermal stability was higher than the polymers containing silicon which agrees with the lower polarity and higher energy of the C-Ge bond in comparison with the C-Si one.

Más información

Título de la Revista: JOURNAL OF APPLIED POLYMER SCIENCE
Volumen: 109
Editorial: Wiley
Fecha de publicación: 2008
Página de inicio: 303
Página final: 308
Idioma: English
Financiamiento/Sponsor: FONDECYT
DOI:

1030528