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Sulfides are the sulfur analog of ethers, just as thiols are the sulfur analog of alcohol. Like ethers, sulfides also consist of two hydrocarbon groups bonded to the central sulfur atom. Depending upon the type of groups present, sulfides can be symmetrical or asymmetrical. Symmetrical sulfides can be prepared via an SN2 reaction between 2 equivalents of an alkyl halide and one equivalent of sodium sulfide.
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Step-growth or condensation polymerization is a stepwise reaction of bi or multifunctional monomers to form long-chain polymers. As all the monomers are reactive, most of the monomers are consumed at the early stages of the reaction to form small chains of reactive oligomers, which then combine to form long polymer chains in the late stages. Hence, the reaction has to proceed for a long time to achieve high molecular weight polymers.
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Precise Sulfite Functionalization of Polyolefins via ADMET Polymerization.

Taylor W Gaines1, Tatsuya Nakano1,2, Yoshiki Chujo2

  • 1Butler Polymer Research Laboratory, Department of Chemistry, University of Florida, Gainesville, Florida 32611-7200, United States.

ACS Macro Letters
|May 21, 2022
PubMed
Summary
This summary is machine-generated.

Novel polysulfites with precisely placed sulfite groups were synthesized. Polymers with longer carbon chains exhibited enhanced crystallinity and thermal stability, with functional groups self-assembling into layers.

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Area of Science:

  • Polymer Chemistry
  • Materials Science

Background:

  • Synthesis of novel polymers with specific functionalities is crucial for advanced material development.
  • Precisely placed functional groups within polymer chains can dictate material properties and self-assembly behavior.

Purpose of the Study:

  • To synthesize novel copolymers containing precisely placed sulfite functionalities.
  • To investigate the structural, thermal, and morphological properties of these unique polysulfites.

Main Methods:

  • Ring-opening metathesis polymerization via acyclic diene metathesis (ADMET) polymerization.
  • Characterization using Nuclear Magnetic Resonance (NMR) spectroscopy (¹H, ¹³C), Infrared (IR) spectroscopy, Thermogravimetric Analysis (TGA), Differential Scanning Calorimetry (DSC), and X-ray scattering.
  • Synthesis of polymers with varying methylene unit lengths (8, 14, and 20) between sulfite groups.

Main Results:

  • Successfully synthesized polysulfites with controlled sulfite placement and weight-average molecular weights up to 40,500 g/mol.
  • Characterized polymer structures confirming precise placement of sulfite functionalities.
  • Observed thermal degradation temperatures up to 310 °C and typical melting points for unsaturated ADMET polymers.
  • X-ray scattering revealed self-assembly of functional groups into layers for polymers with 20 carbons between sulfites.
  • Demonstrated increased crystallinity and thermal stability with higher carbon content.

Conclusions:

  • Achieved synthesis of unprecedented polymer structures with precisely incorporated sulfite groups.
  • Established a correlation between carbon chain length, crystallinity, thermal stability, and self-assembly behavior in these polysulfites.
  • Highlighted the potential of these novel polysulfites for advanced material applications requiring tailored thermal and structural properties.