UCST Type Phase Boundary and Accelerated Crystallization in PTT/PET Blends
We investigated the structure development and crystallization kinetics in the blends of poly(trimethylene terephthalate) (PTT) and poly(ethylene terephthalate) (PET) by polarized optical microscopy and light scattering. The crystallization of the blend was found to be faster and the size of the sphe...
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doaj-145e4678a7984f61ae2edae84acb157d2020-11-25T03:59:44ZengMDPI AGPolymers2073-43602020-11-01122730273010.3390/polym12112730UCST Type Phase Boundary and Accelerated Crystallization in PTT/PET BlendsKousuke Sugeno0Satoshi Kokubun1Hiromu Saito2Department of Organic and Polymer Materials Chemistry, Tokyo University of Agriculture and Technology, Koganei-shi, Tokyo 184-8588, JapanDepartment of Organic and Polymer Materials Chemistry, Tokyo University of Agriculture and Technology, Koganei-shi, Tokyo 184-8588, JapanDepartment of Organic and Polymer Materials Chemistry, Tokyo University of Agriculture and Technology, Koganei-shi, Tokyo 184-8588, JapanWe investigated the structure development and crystallization kinetics in the blends of poly(trimethylene terephthalate) (PTT) and poly(ethylene terephthalate) (PET) by polarized optical microscopy and light scattering. The crystallization of the blend was found to be faster and the size of the spherulites was much smaller than those of the neat component polymers by melt crystallization at low temperature of 180 °C. The discontinuous gap of the crystallization time with temperature was seen in the blends, suggesting phase transition at the temperature <i>T</i><sub>tr</sub>; e.g., the<i> T</i><sub>tr</sub> of the 60/40 PTT/PET was 215 °C. The crystallization was accelerated due to enhancement of the nucleation rate, and interconnected tiny spherulites were obtained at the temperature below the <i>T</i><sub>tr</sub>. The accelerated crystallization and the development of the interconnected structure might be attributed to the liquid-liquid phase separation via spinodal decomposition, due to existence of the upper critical solution temperature (UCST) type phase boundary.https://www.mdpi.com/2073-4360/12/11/2730PTTPETblendcrystallizationphase separationphase diagram |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Kousuke Sugeno Satoshi Kokubun Hiromu Saito |
spellingShingle |
Kousuke Sugeno Satoshi Kokubun Hiromu Saito UCST Type Phase Boundary and Accelerated Crystallization in PTT/PET Blends Polymers PTT PET blend crystallization phase separation phase diagram |
author_facet |
Kousuke Sugeno Satoshi Kokubun Hiromu Saito |
author_sort |
Kousuke Sugeno |
title |
UCST Type Phase Boundary and Accelerated Crystallization in PTT/PET Blends |
title_short |
UCST Type Phase Boundary and Accelerated Crystallization in PTT/PET Blends |
title_full |
UCST Type Phase Boundary and Accelerated Crystallization in PTT/PET Blends |
title_fullStr |
UCST Type Phase Boundary and Accelerated Crystallization in PTT/PET Blends |
title_full_unstemmed |
UCST Type Phase Boundary and Accelerated Crystallization in PTT/PET Blends |
title_sort |
ucst type phase boundary and accelerated crystallization in ptt/pet blends |
publisher |
MDPI AG |
series |
Polymers |
issn |
2073-4360 |
publishDate |
2020-11-01 |
description |
We investigated the structure development and crystallization kinetics in the blends of poly(trimethylene terephthalate) (PTT) and poly(ethylene terephthalate) (PET) by polarized optical microscopy and light scattering. The crystallization of the blend was found to be faster and the size of the spherulites was much smaller than those of the neat component polymers by melt crystallization at low temperature of 180 °C. The discontinuous gap of the crystallization time with temperature was seen in the blends, suggesting phase transition at the temperature <i>T</i><sub>tr</sub>; e.g., the<i> T</i><sub>tr</sub> of the 60/40 PTT/PET was 215 °C. The crystallization was accelerated due to enhancement of the nucleation rate, and interconnected tiny spherulites were obtained at the temperature below the <i>T</i><sub>tr</sub>. The accelerated crystallization and the development of the interconnected structure might be attributed to the liquid-liquid phase separation via spinodal decomposition, due to existence of the upper critical solution temperature (UCST) type phase boundary. |
topic |
PTT PET blend crystallization phase separation phase diagram |
url |
https://www.mdpi.com/2073-4360/12/11/2730 |
work_keys_str_mv |
AT kousukesugeno ucsttypephaseboundaryandacceleratedcrystallizationinpttpetblends AT satoshikokubun ucsttypephaseboundaryandacceleratedcrystallizationinpttpetblends AT hiromusaito ucsttypephaseboundaryandacceleratedcrystallizationinpttpetblends |
_version_ |
1724453078500900864 |