期刊
EUROPEAN POLYMER JOURNAL
卷 115, 期 -, 页码 384-390出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.eurpolymj.2019.03.054
关键词
Precipitation polymerization; Polyurea; Functional microspheres; DMF catalysis; Monomer concentration
资金
- National Nature Science Foundation of China (NSFC) [21274054, 21304038, 51473066]
- Natural Science Foundation [ZR2018MB021, ZR2018BB049]
- Science & Technology Development Plans of Shandong Province [2017GGX202009]
- Research Foundation of University of Jinan [XKY1604]
Highly uniform polymer microspheres are widely used for a variety of applications. Uniform polyurea (PU) microspheres have been prepared by precipitation polymerization of isophorone diisocyanate (IPDI) in a binary mixture of H2O-acetone (AT). With AT replaced by N,N'-dimethylformamide (DMF) in the binary mixture, a significant acceleration effect is observed. Through measurements of the solubility of IPDI and its polymer in the binary solvents of different composition, catalytic effect of DMF is confirmed, and a mechanism of catalysis is proposed. The polymerization is carried out at different temperature with varied IPDI concentration in H2O/DMF or H2O/AT/DMF of different composition, with objective to optimize the preparation of PU microspheres. The results demonstrate that, with the polymerization done at 60 degrees C in a ternary mixture of H2O-DMF-AT, highly uniform PU microspheres are well formed with IPDI concentration of up to 13.0 wt%, which represents an increase of 3 wt% compared to the highest IPDI concentration allowed to have these microspheres in the binary solvent of H2O-AT. This is also accomplished in an obviously shortened time. PU structure and properties are briefly discussed. This work provides a simple and fast protocol for large-scale production of uniform and functional PU microspheres with DMF as a cosolvent and catalyst.
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