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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.
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For any given polymer, the weight average molecular weight (Mw) is higher than, if not equal to, the number average molecular weight (Mn). The only situation in which the weight average molecular weight and the number average molecular weight are equal is when a polymer consists only of chains with equal molecular weight. However, this never happens in a synthetic polymer, since it is difficult to control the polymerization process up to a molecular level with accuracy to a hundred percent.
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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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Thermodynamic potentials are state functions that are extremely useful in analyzing a thermodynamic system. They have dimensions of energy. The four important thermodynamic potentials are internal energy, enthalpy, Helmholtz free energy, and Gibbs free energy. These thermodynamic potentials can be expressed using two of the following variables: pressure, volume, temperature, and entropy. These two variables are expressed as the rate of change of the thermodynamic potential with respect to other...
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Thermopower scaling in conducting polymers.

Morgan Lepinoy1,2, Patrice Limelette3, Bruno Schmaltz2

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Thermoelectric materials like poly(3,4-ethylenedioxythiophene) (PEDOT-Tos) convert heat to electricity. This study reveals their transport properties are governed by Dirac fermions, offering new optimization pathways.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Energy Harvesting

Background:

  • Thermoelectric effects enable direct heat-to-electricity conversion, crucial for waste heat recovery.
  • Optimizing thermoelectric materials requires deep understanding of charge transport phenomena, specifically thermopower (α) and electrical conductivity (σ).
  • Conducting polymers show promise for thermoelectric applications, but their transport mechanisms remain incompletely understood.

Purpose of the Study:

  • To investigate the charge transport mechanisms governing the thermoelectric properties of poly(3,4-ethylenedioxythiophene) doped with tosylate ions (PEDOT-Tos).
  • To elucidate the underlying physics behind the observed scaling relationship between thermopower and electrical conductivity in PEDOT-Tos.

Main Methods:

  • Experimental characterization of thermoelectric properties (α and σ) of PEDOT-Tos.
  • Theoretical analysis of transport phenomena, comparing experimental data with existing and novel theoretical models.

Main Results:

  • The thermoelectric properties of PEDOT-Tos exhibit a universal scaling relation: α ∝ σ-1/4.
  • Conventional transport theories fail to explain this specific scaling exponent.
  • The observed behavior is consistent with charge transport mediated by massless pseudo-relativistic quasiparticles (Dirac fermions) scattered by unscreened ionized impurities.

Conclusions:

  • The charge transport in PEDOT-Tos is dominated by Dirac fermions, a finding that challenges conventional understanding.
  • This discovery provides critical insights into optimizing thermoelectric performance in conducting polymers.
  • The identification of Dirac fermion transport opens new avenues for designing advanced thermoelectric materials.