Experimental data illustrating effect of compatibility on plasticized systems

Xs th enh opy contribution related to coordination number (number of plasticizer molecules [Pg.145]

62 dispersion-polar components of solubility parameters of polymer and plasticizer, [Pg.145]

It is proposed to use = 0.34 for better utility of prognostic calculations. With this value, the equation may show the significant deviations from experiment because the interaction between polymer and plasticizer may be caused by the dispersion forces and many other factors. The value on the right side of Eq. [6.36] may be taken from Eq. [6.28] for polymers having large number of hydrogen bonds. The equation [6.36] may thus be rewritten as follows [Pg.145]

The advantage of using the miscibility parameter lies in its direct correlation with the solubility parameters of the polymer and the plasticizer and in the possibility it offers to find some semi-empiiieal relationships with compatibility that differ from those in Eq. [6.35]. [Pg.145]

Equilibrium swelling is useful measurement to make when attempting to plasticize crosslinked elastomers. It is related to X t y Eq. [6.4]. The concentration of plasticizer in the product (paint, varnish, solution) should always be less than its concentration at equilibrium swelling. Solubility parameters of polymers and plasticizers may also be consulted to determine compatibility. The difference between the solubility parameters of compatible polymer and plasticizer should be less than approximately 2 (MJ/m ) . [Pg.145]

Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...