Influence of flexible segment length on the phase structure and properties of poly(hexamethylene 2,5-furandicarboxylate)-block-biopolytetrahydrofuran copolymers
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Abstract Two series of biobased poly(ether‐ester)s comprised of poly(hexamethylene 2,5‐furandicarboxylate) (PHF) as the rigid segments and biopolytetrahydrofuran (pTHF) with different molecular masses (1000 and 2000 g/mol) as the flexible segments were synthesized employing polycondensation in the molten state. The study mainly focuses on comparing these two series in terms of the length of the flexible segment. The content of pTHF segments in the copolymer chains varied from 25 to 75 wt.%. The molecular structure and composition, phase structure, and thermal and mechanical properties were characterized by nuclear magnetic resonance (1H NMR) and Fourier‐transformed infrared (FTIR) spectroscopies, differential scanning calorimetry (DSC), dynamic mechanical thermal analysis (DMTA), and positron annihilation lifetime spectroscopy (PALS). In addition, mechanical performance and thermo‐oxidative and thermal stability have been investigated. Moreover, cyclic tensile properties were studied to evaluate the elastic properties. 1H NMR and FTIR spectroscopies demonstrate that the syntheses were correctly carried out, which made it possible to obtain the desired compositions of the block copolymers with high molecular masses. The decrease in Tm1, Tc1, and XcPHF values was visible, along with the increase in the flexible segment content. Moreover, the characteristic properties measured by PALS and the values of temperatures designated from TGA (inert and oxidizing atmosphere) did not vary between copolymer series PHF‐b‐F‐pTHF1000 and PHF‐b‐F‐pTHF2000. In turn, along with an increase in flexible segment content and the length of the pTHF, the values of tensile modulus, stress at break, and hardness decrease, while the value of elongation at break increases.
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The exothermic peak in the −30 °C to 15 °C range in each sample was due to crystallization of PTHF chains in PU-GT.
“which was due to the crystallization of PTHF chains in PU-GT [33].”
From A Novel Polytetrahydrofuran-Based Shape Memory Polyurethane Enhanced by Polyglycolide-Block-Polytetrahydrofuran-Block-Polyglycolide Copolymer (2024) · cites this paper as [33]
Section 3.1 and Table 2 identify crystallization peaks from a pTHF-rich phase at −27 °C to −13 °C in the PHF-b-F-pTHF2000 copolymers, within the claimed range. The paper does not identify those peaks in PU-GT or establish that they occur in each PU-GT sample. (LLM, conf=0.84)
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Miao, X., Han, R., Tian, J., Ma, Y., Müller, A. J., & Li, Z. (2025) · Angewandte Chemie International Edition · doi:10.1002/anie.202417627 · Cited by 27 · see citing works
Li, X., Mao, L., Li, W., Wu, H., Dai, S., Xiao, R., Huang, J., Liu, G., Yang, K., Bu, W., et al. (2024) · Polymers · doi:10.3390/polym16243610 · Cited by 1 · see citing works
“In the temperature range of − 30 ◦ C to 15 ◦ C, an exothermic peak emerged in each sample, which was due to the crystallization of PTHF chains in PU-GT [33]. to the cooling process.”
- Authors
- Paszkiewicz, S., Walkowiak, K., Irska, I., Rozwadowski, Z., & Dryzek, J.
- Affiliations
- West Pomeranian University of Technology in Szczecin (PL)
- Institute of Nuclear Physics, Polish Academy of Sciences (PL)
- Corresponding author
- Paszkiewicz, Sandra
- Venue
- Journal of Applied Polymer Science
- Publisher
- Wiley
- Published
- 2024-01-02
- Volume
- 141
- Issue
- 11
- ISSN
- 0021-8995 (ISSN-L)
- 1097-4628
- OpenAlex
- W4390507136
- Cited by
- 3
- References
- 59
- Citations by year
- 2024: 3
- FWCI
- 0.28
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- Journal of Applied Polymer Science (publishedVersion)
- Topics
- Physical Sciences › Materials Science › Biomaterials › biodegradable polymer synthesis and properties
- Physical Sciences › Materials Science › Polymers and Plastics › Polymer crystallization and properties
- Physical Sciences › Materials Science › Materials Chemistry › Block Copolymer Self-Assembly
- Keywords
- block copolymers, phase structure, block copolymerization, thermal stability, mechanical properties, tensile properties, bio-based polymers, positron annihilation lifetime spectroscopy
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