Cross-link point functionality influence on elastic properties of model pdms networks

G.A. MONTI; R. H. ACOSTA; E. DRUETTA; D. A. VEGA; M.A. VILLAR; E.M. VALLÉS

Tarragona, España

Congreso; EUROMAR Magnetic Resonance Meeting; 2007

In this work we study the influence of the functionality of the cross-link points on the molecular structure.Trifunctional and tetrafunctional groups are used and the molecular weight of added chains is varied for a fixedmolecular weight of elastic chains. Networks prepared with tetrafunctional cross-link points produce structures thatare more rigid than the ones prepared with trifunctional groups. The equivalence of a physical entanglementwith a chemical cross-link point is determined by inspection of the residual dipolar couplings and elasticmodulus values obtained for the different prepared networks.