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 language | English |
|---|---|
| Pages (from-to) | 762-772 |
| Number of pages | 11 |
| Journal | International Journal of Biological Macromolecules |
| Volume | 117 |
| DOIs | |
| Publication status | Published - 1 Oct 2018 |
Keywords
- Bio-nanocomposites
- Chitosan
- DSC
- Mechanical properties
- TGA/DTA
- XRD
Cite this
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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 journal › Article › Research › peer-review
TY - JOUR
T1 - Thermal degradation behavior and X-ray diffraction studies of chitosan based polyurethane bio-nanocomposites using different diisocyanates
AU - Javaid, Muhammad Asif
AU - Rizwan, Muhammad
AU - Khera, Rasheed Ahmad
AU - Zia, Khalid Mahmood
AU - Saito, Kei
AU - Zuber, Muhammad
AU - Iqbal, Javed
AU - Langer, Peter
PY - 2018/10/1
Y1 - 2018/10/1
N2 - 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.
AB - 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.
KW - Bio-nanocomposites
KW - Chitosan
KW - DSC
KW - Mechanical properties
KW - TGA/DTA
KW - XRD
UR - http://www.scopus.com/inward/record.url?scp=85048557110&partnerID=8YFLogxK
U2 - 10.1016/j.ijbiomac.2018.05.209
DO - 10.1016/j.ijbiomac.2018.05.209
M3 - Article
VL - 117
SP - 762
EP - 772
JO - International Journal of Biological Macromolecules
JF - International Journal of Biological Macromolecules
SN - 0141-8130
ER -