Chem. J. Chinese Universities ›› 2013, Vol. 34 ›› Issue (12): 2871.doi: 10.7503/cjcu20130789

• Polymer Chemistry • Previous Articles     Next Articles

Synthesis and Properties of Intermolecular Self-crosslinking Organic-inorganic Hybrid Waterborne Polyurethane Based on CuAAC Reaction

LI Xing-Jian, HU Jing, SUN Dao-Xing, ZHANG Yi-Heng   

  1. Department of Environment and Safety Engineering, Qingdao University of Science & Technology, Qingdao 266042, China
  • Received:2013-08-15 Online:2013-12-10 Published:2013-10-23

Abstract:

A series of waterborne polyurethane(WPU) bearing the varying quantities of alkyne functions as pendant groups located along the backbone was synthesized via the 4,4'-bis(hydroxymethyl)-1,4-heptadiyne functional monomer as a chain extender. The room temperature intermolecular self-crosslinking organic-inorganic hybrid WPU was prepared based on the Cu(Ⅰ)-catalyzed azide-alkyne cycloaddition(CuAAC) reaction between alkyne-functionalized WPU and azide propyltriethoxysilane(APTES-N3). The self-crosslinking organic-inorganic hybrid WPU was prepared, which was confirmed by FTIR and 1H NMR. The influences of the grafting amount of APTES-N3 on properties of the WPU films and the emulsion particle morphology of WPU were studied. The results indicate that with the increase of APTES-N3, crystallinity of the WPU films decreased and resistance to water, solvent resistance and thermal stability of the WPU films increased, and the degree of mutual adhesion of emulsion particles enhanced. As the mass fraction of APTES-N3 increases from 0 to 12%, the tensile strength of the WPU film increases from 14.3 MPa to 28.6 MPa. Synthetically taking into account the emulsion stability, water resistance and mechanical properties of WPU, when the mass fraction of APTES-N3 is 12%, the integrative performances of WPU is the best.

Key words: Copper catalyzed 1,3-dipolar cycloaddition reaction, Organic-inorganic hybrid waterborne polyurethane, Room temperature intermolecular self-crosslinking

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