Preparation and properties of crosslinkable waterborne polyurethane and polyurethane-acrylic hybrid emulsions and their crosslinked polymers

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• 作者：Kim HyeLin ; Lee YoungHee ; Kim JungSoo ; Park ChaCheol…
• 关键词：Crosslinkable waterborne polyurethane ; Polyurethane ; acrylic hybrid ; Crosslinked polymers ; High performance antifouling coating materials
• 刊名：Journal of Polymer Research
• 出版年：2016
• 出版时间：December 2016
• 年：2016
• 卷：23
• 期：12
• 全文大小：1,433 KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Polymer Sciences
  Industrial Chemistry and Chemical Engineering
  Characterization and Evaluation Materials
  
• 出版者：Springer Netherlands
• ISSN：1572-8935
• 卷排序：23

文摘

Stable emulsions of crosslinkable waterborne polyurethanes (CWPU) and waterborne polyurethane-acrylic (CWPU/AC) hybrid with various contents of trifunctional monomer (trimethylolpropane, TMP) and acrylic monomers were successfully prepared in this study. This study focused on the effects of crosslinkable TMP and acrylic monomer contents on the stability/average particle size/viscosity of CWPU and CWPU/AC hybrid emulsions, the mechanical/dynamic mechanical thermal properties, surface contact angle/tension and hardness/water swelling of CWPU and CWPU/AC hybrid film materials. The as-polymerized CWPU emulsion containing 0.06 mol (4.11 mol%) of TMP and CWPU/AC hybrid emulsion containing 60 wt% of acrylic monomer were found to be unstable, indicating that these contents were beyond the limit value of the self-emulsifying ability of dimethylol propionic acid (18.26 mol%). By XPS analysis, CWPU and CWPU/AC film samples were found to have silicone/fluorine enriched surface. The tensile strength/modulus/hardness of the film samples increased markedly with increasing crosslinkable TMP/acrylic monomer up to 0.04 mol/50 wt%, respectively. Meanwhile the elongation at break and water swelling % decreased significantly. The water/ethylene glycol contact angles increased/the surface tension decreased significantly with increasing crosslinkable TMP/acrylic monomer contents up to 0.04 mol/50 wt%. Thus, the optimum TMP/acrylic monomer contents were found to be about 0.04 mol/50 wt% to obtain high performance antifouling coating materials.