The effects of the inclusion of 1,2,4-triazole derivatives into the main chains of the polyurethane urea exposed to UV radiation

Autor:	Stefan Oprea, Violeta Otilia Potolinca
Rok vydání:	2021
Předmět:	chemistry.chemical_compound Materials science Polymers and Plastics chemistry Organic Chemistry Crosslinked polymers Polymer chemistry Materials Chemistry Urea 1 2 4-Triazole Inclusion (mineral) Prepolymer Polyurethane
Zdroj:	High Performance Polymers. 34:115-128
ISSN:	1361-6412 0954-0083
DOI:	10.1177/09540083211043737
Popis:	Linear polyurethane urea containing 1,2,4-triazole segments was obtained by polyaddition of the 3,5-diamino-1,2,4-triazole (DATA) to urethane prepolymer. Also, three crosslinked polymers with different crosslinkers (2,4,6-triaminopyrimidine (TAP), glycerin (Gly), castor oil (CO)) were synthesized. Thermogravimetric analysis, of the obtained polymers, indicated good thermal stability up to 310°C. The polyurethane urea chemical structure was confirmed by FTIR analysis. The glass transition temperatures (Tg) of these polymers, measured by differential scanning calorimetry (DSC), were found in the range of −52°C to −56°C. These values were not significantly influenced by the structure of the hard domain and the intermolecular interactions. The tensile testing showed that the inclusion of 1,2,4-triazole in polyurethane structure substantially improves the tensile strength up to 58 MPa. The obtained polyurethane urea presents surface slight hydrophobic and low interfacial tension. The positive effect of the 1,2,4-triazole segment from the polymer main chain in the UV aging process of these polymer materials has been studied. After exposure to UV radiation, few changes were observed in the molecular structure, in the surface morphology and the mechanical properties.
Databáze:	OpenAIRE
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