The effect of pendant alkyl chain length on the barrier properties of epoxy/amine crosslinked networks

The effect of pendant alkyl chain length on the barrier properties of epoxy/amine crosslinked networks

Aliphatic amido amine crosslinkers have been commercially used in epoxy coatings to enhance water barrier properties for corrosion prevention. However, there is only an empirical understanding of how these aliphatic polyamine crosslinkers affect properties of thermoset polymers, which limits our abi...

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Bibliographic Details
Published in:Polymer (Guilford) Vol. 132; pp. 133 - 142
Main Authors: Vergara, J.H., La Scala, J.J., Henry, C.K., Sadler, J.M., Yadav, S.K., Palmese, G.R.
Format: Journal Article
Language:English
Published: Kidlington Elsevier Ltd 06-12-2017
Elsevier BV
Subjects:
Aliphatic compounds
Coating effects
Corrosion mechanisms
Corrosion prevention
Crosslinking
Curing agents
Diffusion
Diffusivity
Epoxy coatings
Formulations
Glass transition temperature
Permeability
Polymers
Properties (attributes)
Solubility
Studies
Thermosetting resins
Transition temperatures
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Summary:Aliphatic amido amine crosslinkers have been commercially used in epoxy coatings to enhance water barrier properties for corrosion prevention. However, there is only an empirical understanding of how these aliphatic polyamine crosslinkers affect properties of thermoset polymers, which limits our ability to design newer and more environmentally friendly coating systems. In this work, a series of model aliphatic amido amine curing agents are synthesized and used to create model epoxy/amine networks found in commercial coating formulations. These model systems are interrogated to understand the effects of pendant alkyl chain length material properties including modulus, glass transition temperature, solubility, diffusivity, and permeability of water. This work shows that increasing the pendant aliphatic chain reduces the solubility of water while simultaneously increasing the diffusivity to water in the polymer network. [Display omitted] •Model amidoamines (AMAMn) were synthesized in high purity with varying alkyl chain length (n).•The Tg of thermosets with AMAMns were insensitive to increasing n.•Solubility and diffusivity of these thermosets were strongly correlated with inter-monomer oxygen concentration.
ISSN:0032-3861
1873-2291
DOI:10.1016/j.polymer.2017.10.042