[article]
| Titre : |
Synthesis, application and comparison of aqueous polyurethane |
| Type de document : |
texte imprimé |
| Auteurs : |
Shuling Chai, Auteur ; Lihong Fu, Auteur ; Huimin Tan, Auteur |
| Année de publication : |
2008 |
| Article en page(s) : |
p. 191 - 199 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Index. décimale : |
675 Technologie du cuir et de la fourrure |
| Résumé : |
A series of aromatic and aliphatic cationic aqueous polyurethane dispersions were successfully prepared with polypropylene glycol, polypropylene polyol, toluene diisocyanate(TDI), and isophorone diisocyanate(IPDI) as raw materials. The structure and properties of the synthesized aqueous polyurethane dispersions were characterized with FTIR, UV spectra, TEM, DSC, TGA, electronic tensile machine, and the aliphatic and aromatic cationic aqueous polyurethane were compared. Both the aliphatic and the aromatic cationic aqueous polyurethanes are all two phase structure systems. Their two glass transitions took place in the range of-100°C to +220 °C, respectively corresponding to the glass transitions of soft segments and hard segments. Their thermal decomposition also exhibited two stages, respectively corresponding to thermal decompositions of hard segments and soft segments. The strong Pi-Pi* transition absorption peaks took place when X was in the vicinity of 220nm. With the increasing of isocyanate (NCO) group content, the tensile strengths of the films increased and their elongations at break decreased. The particle morphologies of aromatic and aliphatic dispersions both are spherical. They both could be used as the base sealing of pig leather. They also could be used in the sandwich finishing system for pig garment leathers. Compared to the aromatic cationic aqueous polyurethane, the aliphatic series is lower at the glass transition of hard segments, better at photo-resistance; greater in the elongation at break, and lower in tensile strength. The aliphatic cationic aqueous polyurethane can be used as the finishing system of shallow color pig leather or white pig leather, and its UV spectra did not show a characteristic B absorption peak. |
| En ligne : |
https://drive.google.com/file/d/1eLd_nFVJTdFoUPfEnEMuTTRqf8jnJ9B6/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2566 |
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CIII, N° 5 (05/2008) . - p. 191 - 199
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