Abstract
A number of polyurethane ureas (PUUs) containing 1,8-diamino-3,6-dioxooctane (DOODA) in their structure as a macrochain extender were synthesized with a different molar ratio of 4,4'-diaminodiphenylmethane (DADPh) to DOODA as 30:70; 50:50; 70:30. Synthesized polymers are elastic, transparent films with a thickness of 0.3 mm. According to the results of physical and mechanical tests, the tensile strength of the synthesized PUUs is in the range of (0.7-2.0) MPa, and the relative elongation at break is in the range of (73.9-584.7)%. The best physical and mechanical characteristics have the polymer synthesized with a ratio of DADPh:DOODA as 0.3:0.7 with a tensile strength of 2.0 MPa and a relative elongation of 522%. The formation of PUUs was confirmed by the method of IR-spectroscopy. Thermophysical properties synthesized by DSC, TGA methods were studied. It was established that the glass transition temperature (Tg) in a number of synthesized PUUs with DOODA is in the range from (minus) 18.50 °C to (minus) 34.52 °C. An increase in the content of 1,8-Diamino-3,6-dioxaoctane in the PUUs structure leads to a decrease in Tg and a slight increase in ΔCp during the second heating. According to the TGA, the heat resistance characteristics of the synthesized PUUs depend on the content of DOODA. When entering the structure of the PUUs DOODA, a decrease of the temperature of the start of the decomposition (T0) and the temperature of the maximal speed of the decomposition (Tmax), which is non-linear nature. T0 of the synthesized PUUs is in the range (275.16-289.8)°C and is accompanied by a slight loss of mass (0.007-0.093)%. Synthesized PUUs are heat-resistant to a temperature of 275.16 °C, which makes it possible to carry out dry sterilization of samples without changing their characteristics. Synthesized PUUs are promising materials for the immobilization of medicinal substances for further use in medicine.
Publisher
National Academy of Sciences of Ukraine (Co. LTD Ukrinformnauka) (Publications)
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