|
ИСТИНА |
Войти в систему Регистрация |
Интеллектуальная Система Тематического Исследования НАукометрических данных |
||
Multiblock Thermoplastic Polyurethanes: In Situ Studies of Structural and Morphological Evolution under Strainстатья
Статья опубликована в высокорейтинговом журнале
Статья опубликована в журнале из списка Web of Science и/или Scopus- Авторы: Anokhin Denis V., Gorbunova Marina A., Abukaev Ainur, Ivanov Dimitri A.
- Журнал: Materials
- Год издания: 2021
- Издательство: MDPI
- Местоположение издательства: Basel, Switzerland
- DOI: 10.3390/ma14113009
- Аннотация: The structural evolution of multiblock thermoplastic polyurethane ureas based on twopolydiols, poly(1,4-butylene adipate (PBA) and poly-ε-caprolactone (PCL), as soft blocks and twodiisocyanites, 2,4-toluylene diisocyanate (TDI) and 1,6-hexamethylene diisocyanate (HMDI), as hardblocks is monitored during in situ deformation by small- and wide-angle X-ray scattering. It wasshown that the urethane environment determines the crystal structure of the soft block. Consequently,two populations of crystalline domains of polydiols are formed. Aromatic TDI forms rigid domainsand imposes constrains on the crystallization of bounded polydiol. During stretching, the TDI–polydiol domains reveal limited elastic deformation without reorganization of the crystalline phase.The constrained lamellae of polydiol form an additional physical network that contributes to theelastic modulus and strength of the material. In contrast, polydiols connected to the linear semiflexible HMDI have a higher crystallization rate and exhibit a more regular lamellar morphology.During deformation, the HMDI-PBA domains show a typical thermoplastic behavior with plasticflow and necking because of the high degree of crystallinity of PBA at room temperature. Materials with HMDI-PCL bonding exhibit elastic deformation due to the low degree of crystallinity of thePCL block in the isotropic state. At higher strain, hardening of the material is observed due to thestress-induced crystallization of PCL.
- Добавил в систему: Иванов Дмитрий Анатольевич