Structure–Glass Transition Relationships in Non-Isocyanate Polyhydroxyurethanes
Abstract
:1. Introduction
2. Results
2.1. Structure—Hydrogen Bonding
2.2. Thermal Glass Transition
2.3. Overview of Dielectric Spectra
2.4. Local Mobility—β and γ Relaxations
2.5. Dynamic Glass Transition—α Relaxation
2.6. dc Conductivity Coupling with Molecular Mobility
3. Discussion
4. Materials and Methods
4.1. Materials
4.2. Synthesis
4.3. Fourier Transform Infrared Spectroscopy (FTIR)
4.4. Differential Scanning Calorimetry (DSC)
4.5. Broadband Dielectric Spectroscopy (BDS)
5. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Code | Characteristic Amine (CA) | Polyether CC (P-CC) | Molar Fraction (P-CC:CA) | Group(s) | Tg (°C) (±1.0 °C) | ΔcP (J/gK) (±0.05 J/gK) |
---|---|---|---|---|---|---|
S1 | Priamine 1074 | PPO Mw ~460 g/mol | 3:1 | I | 10.8 | 0.63 |
S2 | IPDA | 18.0 | 0.56 | |||
S3 | TETA | 14.6 | 0.59 | |||
S4 | MBCA | I and II | 15.9 | 0.57 | ||
S5 | 2.5:1 | II | 16.9 | 0.51 | ||
S6 | 2:1 | II and III | 14.1 | 0.57 | ||
S7 | PPO Mw ~700 g/mol | III | −7.6 | 0.57 | ||
S8 | PEO Mw ~650 g/mol | −21.7 | 0.67 |
Code. | (CA) | (P-CC) | Molar Fraction P-CC:CA | Group | α Relaxation | ||
---|---|---|---|---|---|---|---|
Δε | a | b | |||||
S1 | P74 | PPO 460 | 3:1 | I | 30.9 ± 0.2 | 0.68 ± 0.01 | 0.55 ± 0.02 |
S2 | IPDA | 40.9 ± 0.4 | 0.63 ± 0.01 | 0.71 ± 0.02 | |||
S3 | TETA | 26.1 ± 0.2 | 0.60 ± 0.01 | 0.64 ± 0.02 | |||
S4 | MBCA | I, II | 27.5 ± 0.2 | 0.67 ± 0.01 | 0.54 ± 0.02 | ||
S5 | 2.5:1 | II | 20.7 ± 0.2 | 0.65 ± 0.01 | 0.53 ± 0.02 | ||
S6 | 2:1 | II, III | 32.4 ± 0.7 | 0.64 ± 0.02 | 0.67 ± 0.03 | ||
S7 | PPO 700 | III | 20.5 ± 0.3 | 0.66 ± 0.03 | 0.53 ± 0.05 | ||
S8 | PEO 650 | 20.2 ± 0.8 | 0.79 ± 0.03 | 0.30 ± 0.04 |
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Raftopoulos, K.N.; Łukaszewska, I.; Lalik, S.; Zając, P.; Bukowczan, A.; Hebda, E.; Marzec, M.; Pielichowski, K. Structure–Glass Transition Relationships in Non-Isocyanate Polyhydroxyurethanes. Molecules 2024, 29, 4057. https://doi.org/10.3390/molecules29174057
Raftopoulos KN, Łukaszewska I, Lalik S, Zając P, Bukowczan A, Hebda E, Marzec M, Pielichowski K. Structure–Glass Transition Relationships in Non-Isocyanate Polyhydroxyurethanes. Molecules. 2024; 29(17):4057. https://doi.org/10.3390/molecules29174057
Chicago/Turabian StyleRaftopoulos, Konstantinos N., Izabela Łukaszewska, Sebastian Lalik, Paulina Zając, Artur Bukowczan, Edyta Hebda, Monika Marzec, and Krzysztof Pielichowski. 2024. "Structure–Glass Transition Relationships in Non-Isocyanate Polyhydroxyurethanes" Molecules 29, no. 17: 4057. https://doi.org/10.3390/molecules29174057