engleski

Compensation phenomena in beta relaxation of novolac phenol-formaldehyde resin. Influence of water

A novolac phenol formaldehide resin was investigated by thermaly stimulated depolarization current in temperature range 137 K to 270 K. Two broadened peaks appeared at 160 K and 190 K. The influence of water was investigated. The analysis of the activation energy versus temperature and the search for compensation phenomena were performed. Three different regions in relaxations were distinguished and the compensation temperatures were determined. Contamination with water increases the polarizability, decreases the structure differences and relieves the motion in resin. All motions were attributed to the rotation of the fenil rings with different surrounding structures.

compensation phenomenon ; novolac phenol formaldehide ; beta relaxation

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