Click Cross-Linking-Improved Waterborne Polymers for Environment-Friendly Coatings and Adhesives

Jianqing Hu, Kaimei Peng, Jinshan Guo, Dingying Shan, Gloria B. Kim, Qiyao Li, Ethan Gerhard, Liang Zhu, Weiping Tu, Weizhong Lv, Michael A. Hickner, Jian Yang

Research output: Contribution to journalArticle

37 Scopus citations

Abstract

Waterborne polymers, including waterborne polyurethanes (WPU), polyester dispersions (PED), and polyacrylate emulsions (PAE), are employed as environmentally friendly water-based coatings and adhesives. An efficient, fast, stable, and safe cross-linking strategy is always desirable to impart waterborne polymers with improved mechanical properties and water/solvent/thermal and abrasion resistance. For the first time, click chemistry was introduced into waterborne polymer systems as a cross-linking strategy. Click cross-linking rendered waterborne polymer films with significantly improved tensile strength, hardness, adhesion strength, and water/solvent resistance compared to traditional waterborne polymer films. For example, click cross-linked WPU (WPU-click) has dramatically improved the mechanical strength (tensile strength increased from 0.43 to 6.47 MPa, and Young's modulus increased from 3 to 40 MPa), hardness (increased from 59 to 73.1 MPa), and water resistance (water absorption percentage dropped from 200% to less than 20%); click cross-linked PED (PED-click) film also possessed more than 3 times higher tensile strength (∼28 MPa) than that of normal PED (∼8 MPa). The adhesion strength of click cross-linked PAE (PAE-click) to polypropylene (PP) was also improved (from 3 to 5.5 MPa). In addition, extra click groups can be preserved after click cross-linking for further functionalization of the waterborne polymeric coatings/adhesives. In this work, we have demonstrated that click modification could serve as a convenient and powerful approach to significantly improve the performance of a variety of traditional coatings and adhesives.

Original languageEnglish (US)
Pages (from-to)17499-17510
Number of pages12
JournalACS Applied Materials and Interfaces
Volume8
Issue number27
DOIs
StatePublished - Jul 13 2016

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

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