期刊
INTERNATIONAL JOURNAL OF POLYMER ANALYSIS AND CHARACTERIZATION
卷 21, 期 8, 页码 708-717出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/1023666X.2016.1207129
关键词
Blocked isocyanate; deblocking temperature; pyridinol; thermal dissociation; waterborne polyurethane
资金
- Key Project of Department of Education of Guangdong Province [NO2012CXZD0007]
A series of pyridinol-blocked isophorone isocyanates were synthesized through esterification reaction, Fries rearrangement, and blocking reaction and characterized by H-1-NMR, C-13-NMR, and Fourier transform infrared spectra. Based on the synthesized blocked isocyanates, the blocked waterborne polyurethane (BWPU) was prepared by the self-emulsification method. The deblocking studies revealed that the deblocking temperature reduces with electron-withdrawing and steric hindrance substituents on the ortho position of pyridinol. The stability, molecular weight (M-w), particle size, viscosity, and hydrophilicity of BWPU were studied and compared. The results showed that with an increased amount of blocking agents, molecular weight, particle size, and viscosity decrease and the hydrophilicity increases.
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