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

被引：59

作者：

Asensio, Manuel ^{[1
]}

Costa, Victor ^{[2
]}

Nohales, Andres ^{[2
]}

Bianchi, Otavio ^{[3
]}

Gomez, Clara M. ^{[1
]}

机构：

[1] Univ Valencia, Inst Mat Sci, Valencia 46980, Spain

[2] UBE CORP EUROPE SA, R&D Dept, Castellon de La Plana 12100, Spain

[3] Univ Caxias Sul, Dept Chem Engn, BR-95070560 Caxias Do Sul, RS, Brazil

来源：

POLYMERS | 2019年 / 11卷 / 12期

关键词：

thermoplastic polyurethane; flexible segment; degradation; phase segregation; mechanical and thermal properties; MECHANICAL-PROPERTIES; MOLECULAR-WEIGHT; SOFT SEGMENTS; IN-VITRO; ELASTOMERS; MORPHOLOGY; BEHAVIOR; DEGRADATION; TRANSITION; COPOLYMERS;

D O I：

10.3390/polym11121910

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

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.

引用

页数：19

共 61 条

[1] Observation of the early stages of crystallization in polyethylene by time-dependent SAXS: Transition from individual crystals to stacks of lamellae [J].