One-Shot Synthesis of Thermoplastic Polyurethane Based on Bio-Polyol (Polytrimethylene Ether Glycol) and Characterization of Micro-Phase Separation

In this study, a series of bio-based thermoplastic polyurethane (TPU) was synthesized via the solvent-free one-shot method using 100% bio-based polyether polyol, prepared from fermented corn, and 1,4-butanediol (BDO) as a chain extender. The average molecular weight, degree of phase separation, ther...

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Bibliographic Details
Published in:Polymers 2022-10, Vol.14 (20), p.4269
Main Authors: Jung, Yang-Sook, Lee, Sunhee, Park, Jaehyeung, Shin, Eun-Joo
Format: Article
Language:English
Subjects:
Atomic force microscopy
Butanediol
Calorimetry
Diffraction
Diisocyanates
Diphenyl methane diisocyanate
Domains
Fatty acids
Fourier transforms
Glycols
Hydrogen
Hydrogen bonding
Infrared spectroscopy
Isocyanates
Liquid chromatography
Mechanical properties
Molecular weight
Morphology
Phase separation
Physical properties
Polyethylene
Polymerization
Polymers
Polyurethane resins
Polyurethanes
Segments
Spectrum analysis
Thermal analysis
Thermodynamic properties
Thermogravimetric analysis
Urethane thermoplastic elastomers
Vegetable oils
VOCs
Volatile organic compounds
X-rays
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Summary:In this study, a series of bio-based thermoplastic polyurethane (TPU) was synthesized via the solvent-free one-shot method using 100% bio-based polyether polyol, prepared from fermented corn, and 1,4-butanediol (BDO) as a chain extender. The average molecular weight, degree of phase separation, thermal and mechanical properties of the TPU-based aromatic (4,4-methylene diphenyl diisocyanate: MDI), and aliphatic (bis(4-isocyanatocyclohexyl) methane: H12MDI) isocyanates were investigated by gel permeation chromatography, Fourier transform infrared spectroscopy, atomic force microscopy, X-ray Diffraction, differential scanning calorimetry, dynamic mechanical thermal analysis, and thermogravimetric analysis. Four types of micro-phase separation forms of a hard segment (HS) and soft segment (SS) were suggested according to the [NCO]/[OH] molar ratio and isocyanate type. The results showed (a) phase-mixed disassociated structure between HS and SS, (b) hydrogen-bonded structure of phase-separated between HS and SS forming one-sided hard domains, (c) hydrogen-bonded structure of phase-mixed between HS, and SS and (d) hydrogen-bonded structure of phase-separated between HS and SS forming dispersed hard domains. These phase micro-structure models could be matched with each bio-based TPU sample. Accordingly, H-BDO-2.0, M-BDO-2.0, H-BDO-2.5, and M-BDO-3.0 could be related to the (a)—form, (b)—form, (c)—form, and (d)—form, respectively.
ISSN:2073-4360
2073-4360
DOI:10.3390/polym14204269