Synthesis and properties of biodegradable network poly(ether-urethane)s fromL -lysine triisocyanate and poly(alkylene glycol)s
| Autor: | Wataru Sakai, Minoru Nagata, Akito Oi, Naoto Tsutsumi |
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| Rok vydání: | 2012 |
| Předmět: |
Materials science
Polymers and Plastics Ether General Chemistry Dynamic mechanical analysis Toluene Surfaces Coatings and Films chemistry.chemical_compound Differential scanning calorimetry chemistry Polymer chemistry PEG ratio Materials Chemistry Fourier transform infrared spectroscopy Ethylene glycol Tetrahydrofuran |
| Zdroj: | Journal of Applied Polymer Science. 126:E358-E364 |
| ISSN: | 0021-8995 |
| DOI: | 10.1002/app.36481 |
| Popis: | Biodegradable network poly(ether-urethane) films with different hydrophilicity were prepared from L-lysine triisocyanate (LTI) and poly(ethylene glycol) (PEG), poly(1,4-tetramethylene glycol) (PTMG) or poly (propyrene glycol) (PPG) with the molecular weights of 250–2000 g mol−1. Prepolymers prepared by a melt-polycondensation were cast from tetrahydrofuran solution and heated at 65–80°C for 9 h, then postpolymerized at 150–180°C for 10–20 min to form a network. The resultant films were transparent to opaque and insoluble in water and organic solvents. These network films were fully characterized by FTIR, density measurement, wide-angle X-ray scattering (WAXS), differential scanning calorimetry, dynamic mechanical analysis, and tensile tests. WAXS intensity curves of LTI/PEG-1000 and LTI/PEG-2000 exhibited crystalline peaks due to PEG segments, while those of all other network films did amorphous halos. The molecular weights (Mw) between cross-links increased, while the cross-linking density decreased with increasing the Mws of the poly(alkylene glycol)s. Mechanical properties were strongly affected by the type and molecular weights of poly(alkylene glycol)s used. The weight losses of the LTI/PEG series network films that were degraded in a phosphate buffer solution (pH 7.2) at 37°C and the equilibrium water content in distilled water at 20°C were much larger than those of LTI/PTMG and LTI/PPG series ones. In contrast, LTI/PTMG-1000 and LTI/PPG-1000 network films absorbed 150–216% of organic solvents such as benzene and toluene under equilibrium state at 20°C. The use of poly(alkylene glycol)s with different types and the MWs allowed the preparation of novel network poly(ether-urethane) films with a broad range of properties. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012 |
| Databáze: | OpenAIRE |
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