Version 1
: Received: 26 August 2024 / Approved: 26 August 2024 / Online: 27 August 2024 (10:19:40 CEST)
How to cite:
Paez-Amieva, Y.; Martín-Martínez, J. M. Influence of the Molecular Weight of the Polycarbonate Polyol on the Intrinsic Self-Healing at 20 °C of Polyurethanes. Preprints2024, 2024081906. https://doi.org/10.20944/preprints202408.1906.v1
Paez-Amieva, Y.; Martín-Martínez, J. M. Influence of the Molecular Weight of the Polycarbonate Polyol on the Intrinsic Self-Healing at 20 °C of Polyurethanes. Preprints 2024, 2024081906. https://doi.org/10.20944/preprints202408.1906.v1
Paez-Amieva, Y.; Martín-Martínez, J. M. Influence of the Molecular Weight of the Polycarbonate Polyol on the Intrinsic Self-Healing at 20 °C of Polyurethanes. Preprints2024, 2024081906. https://doi.org/10.20944/preprints202408.1906.v1
APA Style
Paez-Amieva, Y., & Martín-Martínez, J. M. (2024). Influence of the Molecular Weight of the Polycarbonate Polyol on the Intrinsic Self-Healing at 20 °C of Polyurethanes. Preprints. https://doi.org/10.20944/preprints202408.1906.v1
Chicago/Turabian Style
Paez-Amieva, Y. and José Miguel Martín-Martínez. 2024 "Influence of the Molecular Weight of the Polycarbonate Polyol on the Intrinsic Self-Healing at 20 °C of Polyurethanes" Preprints. https://doi.org/10.20944/preprints202408.1906.v1
Abstract
Different polyurethanes (PUs) were synthesized with polycarbonate polyols of molecular weights 500, 1000 and 2000 Da. Their self-healing abilities at 20 °C were tested and their structural, thermal, and mechanical properties were analyzed. The PUs made with polycarbonates of molecular weights 500 (YC500) and 1000 Da (YC1000) exhibited self-healing at 20 °C and the self-healing time of YC1000 was the shortest. The high mobility of the short polymeric chains, the absence of crystallinity and the low degree of micro-phase separation favored self-healing at 20 °C in YC500. However, the presence of tack and the existence of allophanate species and urethane-carbonate and urea-carbonate hydrogen bonds disfavored self-healing. Consequently, the self-healing time at 20 °C of YC500 was longer than expected. On the other hand, YC1000 exhibited an “equilibrium” between the urethane-carbonate and urea-carbonate hydrogen bonds and carbonate-carbonate interactions among the soft segments, so a particular structural order was produced which was associated to its fastest self-healing at 20 °C. The PU made with the polycarbonate of molecular weight 2000 Da did not exhibit self-healing at 20 °C because its significant micro-phase separation and the presence of semi-crystalline soft domains.
Keywords
Intrinsic self-healing at 20 °C; polyurethane; molecular weight of the polyol; polycarbonate polyol; tack; mechanism of self-healing
Subject
Chemistry and Materials Science, Polymers and Plastics
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
