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Molecular engineering and morphology of polyurethane elastomers containing various molecular weight of macrodiol

Naheed, S ; Sharif University of Technology | 2021

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  1. Type of Document: Article
  2. DOI: 10.1016/j.mseb.2020.114960
  3. Publisher: Elsevier Ltd , 2021
  4. Abstract:
  5. A series of polyurethane elastomers (PUEs) based on 4,4′-cyclohexamethylene diisocyanate (H12MDI)/1,2-ethanediol as hard segment with the soft segments having different molecular weights of polycaprolactone diols, were effectively polymerized by two step technique. The structural characterization was performed by FT-IR spectroscopy. The X-ray diffraction (XRD) technique was used to study the crystallinity and hydrophilicity of the prepared polymer films. It was found that crystallinity and hydrophilicity increased with increasing the chain length of soft segments. The effect of molecular weight of polyols on the contact angle, water absorption (%) and swelling behavior of the synthesized polyurethanes were also studied. Moreover, the scanning electron microscopy (SEM) and atomic force microscopy (AFM) techniques revealed that the degree of micro-phase separation increases with increasing molecular weight of polyol which confirmed the results pattern shown by XRD diffractogram. © 2020 Elsevier B.V
  6. Keywords:
  7. Alcohols ; Atomic force microscopy ; Contact angle ; Crystallinity ; Elastomers ; Hydrophilicity ; Morphology ; Phase separation ; Polymer films ; Polyurethanes ; Scanning electron microscopy ; Water absorption ; X ray diffraction ; Diffractograms ; FTIR spectroscopy ; Molecular engineering ; Polycaprolactone diols ; Polyurethane elastomers ; Structural characterization ; Swelling behavior ; Two-step technique ; Molecular weight
  8. Source: Materials Science and Engineering B: Solid-State Materials for Advanced Technology ; Volume 264 , 2021 ; 09215107 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S0921510720304670