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XRD studies of polyurethane elastomers based on chitin/1,4-butane diol blends
Authors:Khalid Mahmood Zia  Ijaz Ahmad Bhatti  Mehdi Barikani  Mohammad Zuber  Haq Nawaz Bhatti
Affiliation:1. Department of Chemistry, University of Agriculture, Faisalabad 38040, Pakistan;2. Iran Polymers and Petrochemicals Institute, P.O. Box 14965/115, Tehran, Iran;3. Department of Textile Chemistry, National Textile University, Faisalabad 37610, Pakistan
Abstract:Chitin based polyurethane elastomers (PUEs) were synthesized by step growth polymerization techniques using poly (ε-caprolactone) (PCL), 4, 4′- diphenylmethane diisocyanate (MDI) and blends of chitin and 1,4-butanne diol (BDO). The conventional spectroscopic characterization of the samples with FT-IR, 1H NMR and 13C NMR were in accordance with proposed PUEs structure. The crystalline behavior of the synthesized polymers were investigated by X-ray diffraction (XRD), differential scanning calorimetery (DSC), optical microscopic technique and loss tangent curves (tan δ peaks). Results showed that crystallinity of the synthesized PUEs samples was affected by varying the chitin contents used as chain extender. The contents of chitin favors the formation of more ordered structure, as higher peak intensities were obtained from the PU extended with chitin than 1,4-butane diol (BDO). X-ray diffraction experiments results correlates with optical microscopy findings. The higher ΔH value; 41.57 (J g?1) was found in the samples extended with chitin than BDO (31.32 J g?1).
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