Preparation and Evaluation of the Dynamic Mechanical Properties of Condensation Nonisocyanate Polyoxybutylene Urethane Films
Keywords:nonisocyanate polyurethanes, dynamical mechanical properties, FTIR, phase transitions
The present study investigates the dynamic mechanical (DMA) properties of condensation nonisocyanate polyurethanes (NIPUR) containing different hard segments (HS) content. NIPUR films were prepared by reacting phenol sulfonic acid with urea and formaldehyde with a molar ratio of 1:1:2. Obtained films were submitted to different thermal treatments prior to DMA testing. The FTIR and DMA results confirmed linear and segmented structures of obtained films with phase separation between HS and SS. The obtained films have shown a wide range of utilization temperature as expressed by the glass transition temperature of SS and the melting temperature of HS. The decomposition of all tested NIPUR films took place at temperatures above 150 °C, confirming their high thermal resistance. The elasticity plateau of annealed samples at 160 °C increased in flatness and breadth.
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