shows, the intensity of the bonded carbonyl
peak is decreased and the peak is broadened more to lower
frequencies by increasing the amount of zeolite in the polymer up
to 20 wt%. The peak of the bonded carbonyl is becoming broader
and its affinity to join with the free carbonyl represents the lower
interaction and establishment of the hydrogen bonds between the
urethane carbonyl groups and the urethane N–H ones. The connection
between the polar groups in zeolite and the N–H groups in ure-