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Title: Efficacy of clay content and microstructure of curing agents on the structure-property relationship of new-generation polyurethane nanocomposites
Authors: Maji, Pradip K.
Bhowmick A.K.
Published in: Polymers for Advanced Technologies
Abstract: The physicomechanical properties of new polyurethanes (PUs) derived from toluene diisocyanate, poly(propylene glycol), and cured by third-generation hyperbranched polyester polyol (HB3), trimethylolpropane (TMP), or glycerol and their nanocomposites have been investigated. An apparent microphase-segregated morphology of PU nanocomposites cured by HB3 has been observed by transmission electron microscopy and atomic force microscopy. Morphological studies reveal regions of mostly exfoliated and some intercalated morphology in the case of the nanocomposites, which have been further ascertained by X-ray diffraction analysis. The HB3-cured PU nanocomposite containing 8wt% of modified montmorillonite (Cloisite 30B) clay shows approximately 140% increase in tensile strength along with improvement in thermal and dynamic mechanical properties in comparison with the control hyperbranched PU. It has also been found from Fourier transform infrared spectroscopy analysis that the extent of tethering reactions between the polymer chains carrying residual -NCO groups and the reactive hydroxyl (-OH) groups of HB3 is significant, and the nanofiller has been found to preferentially react with the -NCO group of the prepolymer. Furthermore, the properties of HB3-cured PU have been compared with the glycerol and TMP-cured PUs and their nanocomposites. The physicomechanical and thermal properties for nanocomposites of HB3-cured PUs are superior to those of the conventionally cured PUs. © 2011 John Wiley & Sons, Ltd.
Citation: Polymers for Advanced Technologies (2012), 23(9): 1311-1320
Issue Date: 2012
Keywords: Cross-linking
Hyperbranched polyester polymer
ISSN: 10427147
Author Scopus IDs: 56249287900
Author Affiliations: Maji, P.K., Rubber Technology Centre, Indian Institute of Technology, Kharagpur 721302, India
Bhowmick, A.K., Rubber Technology Centre, Indian Institute of Technology, Kharagpur 721302, India, Indian Institute of Technology, Patna 800013, India
Corresponding Author: Bhowmick, A.K.; Indian Institute of Technology, Patna 800013, India; email: anilkb@rtc.iitkgp.ernet
Appears in Collections:Journal Publications [PE]

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