Properties of waterborne polyurethane (WBPU) coatings: Effect of alkyl chain length of tertiary amines of carboxylic acid salt groups

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• 作者：Mohammad Mizanur Rahman (3886)
  Han Do Kim (1886)
  Ho-Hwan Chun (2886)
  Inwon Lee (2886)
  Hyun Park (2886)
  
• 关键词：Polyurethane ; Alkyl chain length ; Adhesion strength
• 刊名：Fibers and Polymers
• 出版年：2013
• 出版时间：June 2013
• 年：2013
• 卷：14
• 期：6
• 页码：886-894
• 全文大小：307KB
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• 作者单位：Mohammad Mizanur Rahman (3886)
  Han Do Kim (1886)
  Ho-Hwan Chun (2886)
  Inwon Lee (2886)
  Hyun Park (2886)
  
  3886. Center of Research Excellence in Corrosion (CoRE-C), King Fahd University of Petroleum and Minerals (KFUPM), Dhahran, 31261, Saudi Arabia
  1886. Department of Organic Material Science and Engineering, Pusan National University, Busan, 609-735, Korea
  2886. Global Core Research Center for Ships and Offshore Plants (GCRC-SOP), Pusan National University, Busan, 609-735, Korea
  

文摘

Waterborne polyurethane (WBPU) dispersions were prepared via a pre-polymer process using 4,4-dicyclohexylmethane diisocyanate (H12MDI), poly(tetramethyleneoxideglycol) (PTMG), 2,2-dimethylol propionic acid (DMPA), ethylene diamine (EDA), and tertiary amines (TAs) with varying amounts of DMPA and TAs. Three TAs with different alkyl chain lengths were used to neutralize the DMPA carboxylic group: N,N-dimethylbutylamine (DMBA, C4), N,N-dimethylhexylamine (DMHA, C6), and N,N-dimethyloctylamine (DMOA, C8). The structures of the synthesized WBPUs were determined via FT-IR and 1H NMR spectroscopic techniques. The effects of DMPA and TA content and the TA alkyl chain length on stability of dispersions and properties such as water swelling (%), glass transition temperature (T g ), tensile strength, binding energy and adhesive strength were investigated. The initial adhesive strength of the intact coatings increased with increasing DMPA and TA content and increasing alkyl chain length of TA. However, after immersion of the coatings in water, the adhesive strength decreased. The maximum adhesive strength under water was observed at a DMPA content of 20.20 mol% with 5.30 wt% DMOA, which has the longest alkyl chain.