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Related Experiment Videos

Cis/Trans Reactivity: Epoxy-Amine Systems

López-Quintela1, Prendes, Pazos-Pellín

  • 1Department of Physical-Chemistry, Santiago University, Spain, Department of Analytical Chemistry, La Coruña University-GAIRESA, Spain, and Department of Research, GAIRESA, 15551 Lago-Valdoviño, La Coruña, Spain.

Macromolecules
|July 29, 1998
PubMed
Summary
This summary is machine-generated.

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The reactivity of cis and trans 1,2-diaminocyclohexane isomers with epoxy resins differs. Trans isomers show higher reactivity due to less steric hindrance, impacting tertiary amine formation and material properties.

Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Organic Chemistry

Background:

  • 1,2-diaminocyclohexane (1,2-DCH) is a common curing agent for epoxy resins.
  • Understanding isomer-specific reactivity is crucial for tailoring material properties.

Purpose of the Study:

  • To investigate and compare the distinct reactivities of cis and trans 1,2-DCH isomers during epoxy resin curing.
  • To elucidate the impact of steric hindrance on reaction kinetics and final material characteristics.

Main Methods:

  • Fourier transform infrared (FTIR) spectroscopy in the near-infrared range was used to monitor reaction progress.
  • Differential scanning calorimetry (DSC) was employed to determine glass transition temperatures (Tg).

Main Results:

Related Experiment Videos

  • Primary amine hydrogen disappearance rates were similar for both cis and trans 1,2-DCH isomers.
  • Tertiary amine formation rates differed significantly, with the trans isomer exhibiting higher reactivity.
  • Steric hindrance in the cis isomer slowed secondary amine hydrogen consumption, influencing preexponential factors, Tg, and the ratio of rate constants (R).

Conclusions:

  • The stereochemistry of 1,2-DCH isomers significantly impacts epoxy resin curing kinetics and outcomes.
  • Steric hindrance in the cis isomer leads to slower secondary amine reactivity, affecting material properties like Tg.
  • These findings provide insights for designing epoxy resins with specific performance characteristics.