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Polymers are classified as linear or branched on the basis of their chain architecture. The polymer chains in linear polymers have a long chain-like structure with minimal to no branching at all. Even if a polymer features large substituent groups on the monomer, which appear as branches to the skeleton, it is not considered a branched polymer. A branched polymer contains secondary polymer chains that arise from the main polymer chain. The branching occurs when the polymer growth shifts from...
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Cyclic ethers are heterocyclic compounds with an oxygen atom in the ring along with carbon atoms. They are named depending on the number of carbon atoms present in their ring system. Cyclic ethers with a three-membered ring system are called “oxirane”, four-membered ring systems as “oxetane”, five-membered ring systems as “oxolane”, and six-membered ring systems as “oxane”. The cyclic structure of these rings imposes angle strain, and this strain...
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Naphthalene-Containing Epoxy Resin: Phase Structure, Rheology, and Thermophysical Properties.

Svetlana O Ilyina1,2, Irina Y Gorbunova2, Anastasiya Y Yadykova1

  • 1A.V. Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, 29 Leninsky Prospect, 119991 Moscow, Russia.

Polymers
|December 17, 2024
PubMed
Summary
This summary is machine-generated.

This study embeds naphthalene, a phase-change material and fungicide, into an epoxy matrix. This enhances its stability and thermal energy storage capabilities, creating a novel functional material.

Keywords:
calorimetrydiaminodiphenyl sulfoneepoxy curingepoxy resinfungicidesmiscibilitynaphthalenephase separationphase-change materialsrheology

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Chemical Engineering

Background:

  • Naphthalene exhibits useful phase-change properties and fungicidal activity but suffers from rapid evaporation and shape instability.
  • Incorporating naphthalene into a stable matrix can overcome these limitations, creating advanced functional materials.

Purpose of the Study:

  • To develop a stable phase-change material by embedding naphthalene into a cured epoxy matrix.
  • To investigate the miscibility, rheological, thermophysical, and morphological properties of naphthalene-epoxy blends.
  • To evaluate the thermal energy storage capacity and glass transition temperature of the resulting composite material.

Main Methods:

  • Miscibility was assessed using laser interferometry.
  • Rheological properties were measured using rotational rheometry.
  • Thermophysical properties and curing behavior were analyzed by differential scanning calorimetry.
  • Morphology was examined via transmission optical and scanning electron microscopy.

Main Results:

  • Naphthalene and epoxy resin showed miscibility above 80 °C, enabling high-concentration mixtures (up to 60% naphthalene) via high-temperature curing.
  • Naphthalene incorporation plasticized the epoxy, lowering its glass transition temperature.
  • At 60% naphthalene, the material stored 42.6 J/g of thermal energy between 62-90 °C, with a glass transition temperature of 46.4 °C.

Conclusions:

  • Embedding naphthalene in a cured epoxy matrix effectively stabilizes the phase-change material and fungicide.
  • The resulting composite demonstrates significant thermal energy storage potential and tunable thermophysical properties.
  • This approach offers a promising route for developing advanced functional materials with combined properties.