"Well-defined synthesis of di and triblocks of butadiene-dimethylsiloxane using high vaccum anionic polymerization techniques"

ANDRÉS E. CIOLINO, DIMITRIS PANTAZIS, MARCELO A. VILLAR, ENRIQUE M. VALLÉS Y NIKOS HADJICHRISTIDIS

Gramado (Brasil)

Congreso; X International Macromolecular Colloquium; 2005

Model di and triblock copolymers of butadiene-dimethylsiloxane (PB-b-PDMS and PB-b-PDMS-PB, respectively) were synthesized using high vacuum anionic polymerization techniques. Diblocks were synthesized by sequential addition of monomers, while triblocks by coupling of the living polymer chains with 1,2-bis (chlorodimethyl silyl)ethane. The relative molecular weights of the samples and the mol fraction of the corresponding blocks were determined by size-exclusion chromatography (SEC) and nuclear magnetic resonance (1H-NMR ), respectively. According to the experimental results, PB-b-PDMS and PB-b-PDMS-b-PB with narrow molecular weight distributions (model copolymers) and defined compositions were obtained.