A criterion for microphase separation in segmented polyurethanes and poly(urethane urea)s is proposed. The existence of correlation between the ratios Zhd(Zhs)c, and the degree of segregation (~s~g) was established, where Zh~ is the thermodynamic interaction parameter between soft and hard blocks, calculated from the solubility parameters, and (Xhs), is its critical value, calculated using the Scott equation. Correlation between the ratio Xh~/(Zh~)cr, the degree of segregation ~seg and the flexibility parameter a was also found.
Посилання на статтю:
A criterion for microphase separation in segmented polyurethane and polyurethane ureas / V. A. Vilensky and Y. S. Lipatov // Polymer. – 1994. – Vol 35. – P. 3069-3074.