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Photopolymerization of Acrylated Epoxidized Soybean Oil: A Photocalorimetry-Based Kinetic Study
journal contribution
posted on 2019-12-13, 19:22 authored by Adhimoolam
Bakthavachalam Kousaalya, Beshah Ayalew, Srikanth PillaPhotocure kinetics of acrylated epoxidized soybean oil
(AESO) was
studied via photocalorimetry without adding any diluent/comonomer,
in the presence of two different photoinitiators, namely, 2,2-dimethoxy
phenylacetophenone and 1-hydroxycyclohexyl phenyl ketone. The effect
of varying photoinitiator concentration, light intensity, and temperature
on the extent of crosslinking was calculated from the ratio of experimentally
measured reaction enthalpy to the theoretical enthalpy of reaction
(ΔHtheoretical). Photocuring of
AESO was observed to be a second-order reaction exhibiting autocatalytic
behavior. Nevertheless, due to the occurrence of vitrification, incomplete
crosslinking (α ≠ 1) was observed in most curing conditions.
Rate constants and activation energies were determined using both
nonlinear model-fitting and model-free isoconversional methods. Activation
energy, as determined from the model-free isoconversional method,
was observed to increase as the reaction proceeded, indicating the
shift in cure mechanism from kinetic-controlled to diffusion-controlled.
Finally, the reaction termination mechanism was observed to be a combination
of second-order and primary radical termination mechanisms.
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nonlinear model-fittingreaction enthalpyrate constantscure mechanismPhotocalorimetry-Based Kinetic Study Photocure kineticsActivation energyphotoinitiator concentrationautocatalytic behaviorAcrylated Epoxidized Soybean Oiltermination mechanismslight intensityacrylated epoxidized soybean oilAESOcrosslinkingactivation energiesreaction termination mechanismmodel-free isoconversional method1- hydroxycyclohexyl phenyl ketonemodel-free isoconversional methods
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