INVESTIGADORES
VILLAR Marcelo Armando
artículos
Título:
Synthesis and Characterization of Model Polybutadiene-1,4-b-Polydimethyl-siloxane-b-Polybutadiene-1,4 Copolymers
Autor/es:
A.E. CIOLINO; M.A. VILLAR; E.M. VALLÉS; N. HADJICHRISTIDIS
Revista:
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
Editorial:
Wiley InterScience
Referencias:
Lugar: New York, USA; Año: 2007 vol. 45 p. 2726 - 2733
ISSN:
0887-624X
Resumen:
Model copolymers of poly(butadiene) (PB) and poly(dimethylsiloxane )(PDMS), PB-b-PDMS-b-PB, were synthesized by sequential anionic polymerization (high vacuum techniques) of 1,3-butadiene and hexamethylciclotrisiloxane (D3) on sec-BuLi followed by chlorosilane-coupling chemistry. The synthesized copolymers were characterized by nuclear magnetic resonance (1H NMR), size-exclusion chromatography (SEC), thermogravimetric analysis (TGA), and differential scanning calorimetry (DSC). SEC and 1H NMR results showed low polydispersity indexes (Mw/Mn) and variable siloxane compositions, whereas DSC and TGA experiments indicated that the thermal stability of the triblock copolymers depends on the PDMS composition.
