Phase behavior of model poly(butadiene 1-3)- block- dimethylsiloxane copolymers
- Gomez, Leopoldo Raimundo
- Vega, Daniel Alberto
- Ninago, Mario Daniel
- Ciolino, Andrés Eduardo
- Villar, Marcelo Armando
- Valles, Enrique Marcelo
DOIAbstract
Model diblock copolymers of poly(butadiene-1,3) and poly(dimethylsiloxane) (PB-b-PDMS) of different compositions were synthesized by the sequential anionic polymerization (high vacuum techniques) of butadiene 1,3 and hexamethyl(ciclotrisiloxane), (D3), monomers. The block copolymers were characterized by nuclear magnetic resonance (1H and 13C NMR), size-exclusion chromatography (SEC), Fourier Transform infrared spectroscopy (FTIR), and Small Angle X-ray Scattering (SAXS). SEC combined with 1H-NMR analysis indicate that the PB-b-PDMS copolymers exhibit molar masses between 5000 and 13000 g/mol, narrow polydispersity index (Mw/Mn), and chemical compositions ranging from low to intermediate siloxane content. According to SAXS experiments, at r...
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