New multi-blocked thermoplastic polymers containing rigid polyurethane-urea and soft polydiethylene glycol adipate blocks have been synthesized. Basic features of their structure formation have been revealed. Three types of supramolecular organization have been found, which define the behavior of samples under heating and deformation conditions. The shape memory effect has been interpreted through the transition of one type of morphology to another. The variation of the functional characteristics of the material was addressed in the process of long-time storage at room temperature. The changes of physical-mechanical and thermodynamical properties of the materials were related to structural evolution within 60 months of storage. The competing role of crystallization and phase separation was proposed to explain the unusual mechanical behavior of the materials.

The kinetics of the noncatalytic reactions of isophorone diisocyanate with n propanol, isopro panol, 1,3 diazidopropan 2 ol, propargyl alcohol, and phenol in toluene in the temperature range from 20 to 90°C at the stoichiometric ratio of reactive groups has been investigated by IR spectroscopy. The apparent rate constants for the reactions of the aliphatic and cycloaliphatic isocyanate groups of isophorone diisocy anate with all of the alcohols have been measured. The activation parameters of the reactions of isophorone diisocyanate with n propanol, isopropanol, and 1,3 diazidopropan 2 ol have been determined. The data obtained are considered in terms of the alcohol structure and molecular organization of solutions.

No abstract

No abstract

No abstract