Journal
JOURNAL OF POLYMER RESEARCH
Volume 18, Issue 6, Pages 2425-2433Publisher
SPRINGER
DOI: 10.1007/s10965-011-9656-9
Keywords
Waterborne polyurethanes; Crosslinking; Mechanical properties; Water absorption; Thermal stability
Categories
Funding
- Shaanxi university of science technology [BJ11-04]
- natural science foundation of Shaanxi university of science technology [ZX10-15]
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Self-crosslinkable polyurethane emulsion containing active carbonyl group was obtained using dihydroxyketon N-[(1,1-dimethyl-2-acetyl)ethyl]-beta-dihydroxyethylamino propanamide(DDP) and 1,4-butanediol as chain extenders, isophorone diisocyanate (IPDI), polyether polyol (PTMG1000), dimethylol propionic acid (DMPA) and trimethylol propane (TMP) as main materials, gamma-aminopropyltriethoxysilane (APTES) as end capping agent. Then adipic dihydrazide was added into the emulsion. The structure and composition of DDP and the films were confirmed by means of FTIR and H-1 nuclear magnetic resonance (H-1-NMR) spectrometer, the test results indicated that the reaction between ketone carbonyl and hydrazine has happened during the film curing. The effects of n(NH2NH-)/n(C=O) and DDP content on the properties of the films were studied. The results show that water absorption of the films decreases from 39.3% to 18.9%, crosslinking degree increases from 51.5% to 90.2%, tensile strength increases from 20.1 MPa to 28.3 MPa and pencil hardness is 2H when the DDP content increases from 0% to 6.13%. TGA analysis indicates that the Ketone-Hydrazide crosslinking structure can improve thermal stability of the films.
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