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Network Covalent Solids02:18

Network Covalent Solids

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Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
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Silicone-Containing Biodegradable Smart Elastomeric Thermoplastic Hyperbranched Polyurethane.

Tuhin Ghosh1, Niranjan Karak1

  • 1Advanced Polymer and Nanomaterial Laboratory, Center for Polymer Science and Technology, Department of Chemical Sciences, Tezpur University, Tezpur 784028, India.

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Summary
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New silicone-containing biobased hyperbranched polyurethane thermoplastic elastomers exhibit excellent self-healing, self-cleaning, and shape recovery. These sustainable materials show promise for advanced applications due to their unique properties and biodegradability.

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Biomaterials

Background:

  • Development of advanced thermoplastic elastomers (TPEs) is crucial for innovative material applications.
  • Biobased and sustainable polymers are gaining importance due to environmental concerns.
  • Hyperbranched polymers offer unique properties like low viscosity and high solubility.

Purpose of the Study:

  • To synthesize and characterize novel silicone-containing biobased hyperbranched polyurethane thermoplastic elastomers.
  • To evaluate the self-healing, self-cleaning, shape memory, and mechanical properties of these new materials.
  • To assess the sustainability of these polymers through biodegradation studies.

Main Methods:

  • Synthesis of silicone-containing biobased hyperbranched polyurethane TPEs.
  • Structural analysis using Fourier transform infrared spectroscopy, NMR, X-ray diffraction, and energy-dispersive X-ray spectroscopy.
  • Evaluation of thermal, mechanical, self-healing, self-cleaning, shape memory, and biodegradation properties.

Main Results:

  • Polymers possess high molecular weight (1.11-1.38 × 10^5 g·mol^-1) and low glass transition temperature (-40.0 to -27.3 °C).
  • Achieved 100% repeatable self-healing and shape recovery, 102°-107° contact angle for self-cleaning.
  • Demonstrated exceptional elongation at break (2834-3145%), high toughness, good impact resistance, and adequate tensile strength.
  • Exhibited high thermal stability (253-263 °C), excellent UV and chemical resistance.
  • Showed controlled bacterial biodegradation by Pseudomonas aeruginosa, indicating sustainability.

Conclusions:

  • The novel silicone-containing biobased hyperbranched polyurethane TPEs exhibit a unique combination of desirable properties.
  • These materials demonstrate excellent self-healing, self-cleaning, shape memory, mechanical, and thermal characteristics.
  • The biodegradability of these polymers highlights their potential as sustainable materials for diverse advanced applications.