Thermal degradation behavior and X-ray diffraction studies of chitosan based polyurethane bio-nanocomposites using different diisocyanates

Muhammad Asif Javaid, Muhammad Rizwan, Rasheed Ahmad Khera, Khalid Mahmood Zia, Kei Saito, Muhammad Zuber, Javed Iqbal, Peter Langer

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Five different samples of chitosan based polyurethane bio-nanocomposites (PUBNCs) were synthesized by step growth polymerization technique. Five different diisocyanates were used by keeping hydroxyl terminated polybutadiene (HTPB)/1,4-butane diol (1,4-BDO)/chitosan (CS) and montmorillonite (MMT) clay ratios constant (PUR1–PUR5). For comparative studies, PUR-6 was prepared without CS and clay components. Molecular characterizations of polyurethane (PU) films were carried out by FTIR and NMR which was found to have confirmatory evidence of the proposed structures. X-ray diffraction angles (2θ), d-spacing and intensities of chitosan based samples (PUR1-PUR5) and PUR-6 indicated that crystalline behavior of PUBNCs is influenced by varying diisocyanate structures. TGA/DTA results revealed that chitosan increased thermal stability of PU samples; it also enhanced the mechanical strength and decreased the glass transition temperature (Tg) of all the samples. Based on the above mentioned facts this study suggests the best usage of PUs according to the operational and environmental conditions.

Original languageEnglish
Pages (from-to)762-772
Number of pages11
JournalInternational Journal of Biological Macromolecules
Volume117
DOIs
Publication statusPublished - 1 Oct 2018

Keywords

  • Bio-nanocomposites
  • Chitosan
  • DSC
  • Mechanical properties
  • TGA/DTA
  • XRD

Cite this

Javaid, Muhammad Asif ; Rizwan, Muhammad ; Khera, Rasheed Ahmad ; Zia, Khalid Mahmood ; Saito, Kei ; Zuber, Muhammad ; Iqbal, Javed ; Langer, Peter. / Thermal degradation behavior and X-ray diffraction studies of chitosan based polyurethane bio-nanocomposites using different diisocyanates. In: International Journal of Biological Macromolecules. 2018 ; Vol. 117. pp. 762-772.
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abstract = "Five different samples of chitosan based polyurethane bio-nanocomposites (PUBNCs) were synthesized by step growth polymerization technique. Five different diisocyanates were used by keeping hydroxyl terminated polybutadiene (HTPB)/1,4-butane diol (1,4-BDO)/chitosan (CS) and montmorillonite (MMT) clay ratios constant (PUR1–PUR5). For comparative studies, PUR-6 was prepared without CS and clay components. Molecular characterizations of polyurethane (PU) films were carried out by FTIR and NMR which was found to have confirmatory evidence of the proposed structures. X-ray diffraction angles (2θ), d-spacing and intensities of chitosan based samples (PUR1-PUR5) and PUR-6 indicated that crystalline behavior of PUBNCs is influenced by varying diisocyanate structures. TGA/DTA results revealed that chitosan increased thermal stability of PU samples; it also enhanced the mechanical strength and decreased the glass transition temperature (Tg) of all the samples. Based on the above mentioned facts this study suggests the best usage of PUs according to the operational and environmental conditions.",
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author = "Javaid, {Muhammad Asif} and Muhammad Rizwan and Khera, {Rasheed Ahmad} and Zia, {Khalid Mahmood} and Kei Saito and Muhammad Zuber and Javed Iqbal and Peter Langer",
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Thermal degradation behavior and X-ray diffraction studies of chitosan based polyurethane bio-nanocomposites using different diisocyanates. / Javaid, Muhammad Asif; Rizwan, Muhammad; Khera, Rasheed Ahmad; Zia, Khalid Mahmood; Saito, Kei; Zuber, Muhammad; Iqbal, Javed; Langer, Peter.

In: International Journal of Biological Macromolecules, Vol. 117, 01.10.2018, p. 762-772.

Research output: Contribution to journalArticleResearchpeer-review

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