Properties of Waterborne Polyurethane Adhesives with Aliphatic and Aromatic Diisocyanates

A series of waterborne polyurethane (WBPU) adhesives were prepared with various ratios of aliphatic/aromatic diisocyanates, namely 4,4′-dicyclohexylmethane diisocyanate (H 12 MDI) as an aliphatic diisocyanate and 4,4′-diphenylmethane diisocyanate (MDI) as an aromatic diisocyanate with poly(tetrameth...

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Bibliographic Details
Published in:Journal of adhesion science and technology 2011-01, Vol.25 (16), p.2051-2062
Main Authors: Rahman, Mohammad Mizanur, Hasneen, Aleya, Jo, Nam Ju, Kim, Hea In, Lee, Won-Ki
Format: Article
Language:English
Subjects:
ADHESIVE STRENGTH
Applied sciences
DIISOCYANATE
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Polymers with particular properties
POLYURETHANE
Preparation, kinetics, thermodynamics, mechanism and catalysts
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Summary:A series of waterborne polyurethane (WBPU) adhesives were prepared with various ratios of aliphatic/aromatic diisocyanates, namely 4,4′-dicyclohexylmethane diisocyanate (H 12 MDI) as an aliphatic diisocyanate and 4,4′-diphenylmethane diisocyanate (MDI) as an aromatic diisocyanate with poly(tetramethyleneoxideglycol) (PTMG), ethylene diamine (EDA) and dimethylol propionic acid (DMPA). 1 H-NMR spectroscopy was utilized to investigate the side reaction at the dispersion step during synthesis of WBPU dispersions with respect to aliphatic, aromatic and mixed diisocyanates. The tensile strength, Young's modulus, elongation at break (%), storage modulus, glass transition temperature and adhesive strength were measured with respect to aliphatic/aromatic diisocyanate contents. The adhesive strength was maximum using mixed diisocyanates containing 25 mol% MDI in WBPU adhesives.
ISSN:0169-4243
1568-5616
DOI:10.1163/016942410X544857