期刊
PROGRESS IN ORGANIC COATINGS
卷 74, 期 1, 页码 134-141出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.porgcoat.2011.11.027
关键词
Hyperbranched polyester; Polyurethane coatings; FTIR; DMTA
资金
- Council of Scientific and Industrial Research (CSIR, New Delhi, India)
- CSIR [21(0760)/09/EMR-II]
Effect of chain extender and NCO/OH ratio on the properties of hyperbranched polyurethane (HBPU)-urea and HBPU-imide coatings were examined. The NCO terminated pre-polymers were prepared by reacting the first (G1) and the second (G2) generation hyperbranched polyester polyols (HBP-G1 and HBP-G2) with excess diisocyanate. The excess NCO content of the prepolymer was reacted with different chain extenders viz 3-aminopropyl triethoxysilane (APTES), pyromellitic dianhydride (PMDA) and N-hydroxyphthalimide (NHTM) to obtain HBPU-urea or HBPU-imide coatings. The structure-property relationships of the different coatings were investigated by FTIR peak deconvolution, and these data suggests the highest extent of hydrogen bonding interaction for PMDA-based coatings, which increases with increasing NCO/OH ratio. Film properties were evaluated by TGA, DMTA, UTM and contact angle measurements; these results were supported by FTIR deconvolution results. As per contact angle measurements, hydrophobicity of coatings increased by increasing NCO/OH ratio. The adhesive strength, abrasion resistance, alkali resistance, and gel content of the coatings were also evaluated. (C) 2011 Elsevier B.V. All rights reserved.
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