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Molecular Weight of Step-Growth Polymers01:08

Molecular Weight of Step-Growth Polymers

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Step growth polymerization involves bi or multifunctional monomers. Bifunctional monomers react to form linear step growth polymers, whereas multifunctional monomers react to form non-linear or branched polymers.
As the step-growth polymerization involves step-wise condensation of monomers, the molecular weight also builds up eventually. Consequently, high molecular weight polymers are obtained at the late stages of the polymerization, where 99% of monomers have been consumed.
The extent of the...
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Carbohydrate-Based Reprocessable and Healable Covalent Adaptable Biofoams.

Chandan Upadhyay1, Umaprasana Ojha1,2

  • 1Department of Sciences & Humanities, Rajiv Gandhi Institute of Petroleum Technology, Jais, Amethi, Uttar Pradesh, 229304, India.

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New biofoams offer a sustainable alternative to plastics. These self-healing and recyclable covalent adaptable biofoams (CABs) are derived from plants and show promise for solar energy applications.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Sustainable Materials

Background:

  • Growing demand for eco-friendly materials to combat plastic waste.
  • Need for self-healing and recyclable polymers in various applications.
  • Limitations of conventional isocyanate-based polyurethane foams.

Purpose of the Study:

  • To develop sustainable, bio-based covalent adaptable biofoams (CABs).
  • To provide an alternative to toxic polyurethane foams.
  • To investigate self-healing and recycling capabilities of new biofoams.

Main Methods:

  • Synthesis of polyester-based CABs from carbohydrates and bio-derived precursors.
  • Utilizing catalyst-free conditions for synthesis.
  • Characterization of mechanical properties, self-healing, and reprocessing.

Main Results:

  • Successful synthesis of CABs with dynamic β-keto carboxylate linkages.
  • Demonstrated self-healing and recyclability.
  • Achieved adequate tensile properties, including compressive strength (≤123 MPa).
  • Exhibited swift stress relaxation and reprocessability at 150 °C.
  • Showcased potential for solar photovoltaic attachment to enhance efficiency.

Conclusions:

  • Developed sustainable, self-healing, and recyclable biofoams as an alternative to conventional foams.
  • CABs possess suitable mechanical resilience and limited swellability for commodity applications.
  • Potential applications include solar energy augmentation and other uses.