Based on polyoxyethylated amines ( M n Γ 600, 1,200) derived from n-butyl amine and ethylene oxide, 4,4 -diphenylmethane diisocyanate, and different chain extenders, two series of polyether-polyurethane (PU) ionomers with reasonable mechanical properties were synthesized. Chain-extended by 1,4-butan
Synthesis and properties of polyurethane ionomers based on carboxylated polycaprolactone
β Scribed by Hong Chen; Dongzhong Chen; Quli Fan; Xuehai Yu
- Publisher
- John Wiley and Sons
- Year
- 2000
- Tongue
- English
- Weight
- 173 KB
- Volume
- 76
- Category
- Article
- ISSN
- 0021-8995
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β¦ Synopsis
Polycaprolactone containing carboxyl groups (CPCL, M n Ο 1200) was prepared from caprolactone (CL) and dimethylol propionic acid (DMPA). Based on the CPCL, 4,4Π-diphenylmethane diisocyanate (MDI) and 1,4-butanediol (BD), a novel series of polyurethane ionomers could be synthesized with ions in the soft segment. The tensile modulus and ultimate elongation of the ionomer cast films increased, and the glass transition temperature of the CPCL-rich phase moved to a higher temperature after ionization. Moreover, this kind of ionomers showed small amounts of hard segment crystallinity by DSC. WAXD shows an ionic peak at 2 Ο 8.6Β°for the ionomer with carboxylate in the hard segment, which is not present in the ionomer with carboxylate in the soft segment.
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Fire-resistant polyurethane ionomers successfully synthesized at our laboratory have been proved by infrared spectra. In aqueous solution, the surface tension for fire-resistant polyurethane ionomers made by toluene diisocyanate or isophorone diisocyanate was found to decrease substantially with inc