Tunable Structure and Properties of Segmented Thermoplastic Polyurethanes as a Function of Flexible Segment

Polymers

Otávio Bianchi¹  Manuel Asensio²  and Clara M Gómez²  Victor Costa³  Andrés Nohales³ 

[1] Chemical Engineering Department, University of Caxias do Sul, 95070560 Caxias do Sul, Brazil;Institute of Materials Science, University of Valencia, 46980 Paterna, Valencia, Spain;R&D Department UBE CORPORATION EUROPE, S.A., 12100 Castellon, Spain;

关键词: thermoplastic polyurethane;    flexible segment;    degradation;    phase segregation;    mechanical and thermal properties.;   

DOI  :  10.3390/polym11121910

来源: DOAJ

【 摘 要 】

Segmented thermoplastic polyurethanes (PUs) were synthetized using macrodiols with different functional groups (carbonate, ester, and /or ether) as a segment with a molar mass of 1000 and 2000 g/mol, and 4,4’-diphenylmethane diisocyanate (MDI) and 1,4-butanediol as a rigid segment. The polyurethanes obtained reveal a wide variation of microphase separation degree that is correlated with mechanical properties and retention of tensile properties under degradation by heat, oil, weather, and water. Different techniques such as differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA), Fourier transform infrared (FTIR), and synchrotron small-angle X-ray scattering (SAXS) were used to determine rigid-flexible segments’ phase behaviour. Retention of tensile properties determines the stability of the samples under different external factors. This work reveals that pure polycarbonate-based macrodiols induce the highest degree of phase miscibility, better tensile properties, hardness shore A, and retention of tensile properties under external agents.

【 授权许可】

Unknown