TY - JOUR
T1 - Isothermal frontal polymerization
T2 - Confirmation of the mechanism and determination of factors affecting the front velocity, front shape, and propagation distance with comparison to mathematical modeling
AU - Lewis, Lydia L.
AU - DeBisschop, Cynthia S.
AU - Pojman, John A.
AU - Volpert, Vladimir A.
PY - 2005/12/1
Y1 - 2005/12/1
N2 - Isothermal frontal polymerization (IFP) is a directional polymerization that uses the Trommsdorff, or gel, effect to produce gradient materials for optical applications. When a solution of methyl methacrylate and a thermal initiator contacts a polymer seed (a small piece of polymer), a viscous region is formed in which the polymerization rate is faster because of the Trommsdorff effect. Using the optical techniques of laser line deflection (Weiner's method) and shadowgraphy along with controls, we obtained definitive experimental evidence of IFP. Moreover, we were able to measure accurately and precisely the front position and front concentration profile as a function of time by monitoring IFF systems and controls of various initiator concentrations and cure temperatures. The experimental data were compared with theoretical predictions from a model using mass-diffusion and radical polymerization kinetics. The model reproduced the decrease of the propagation time and showed an increase in the propagation velocity for an increase in the initiator concentration and/or cure temperature.
AB - Isothermal frontal polymerization (IFP) is a directional polymerization that uses the Trommsdorff, or gel, effect to produce gradient materials for optical applications. When a solution of methyl methacrylate and a thermal initiator contacts a polymer seed (a small piece of polymer), a viscous region is formed in which the polymerization rate is faster because of the Trommsdorff effect. Using the optical techniques of laser line deflection (Weiner's method) and shadowgraphy along with controls, we obtained definitive experimental evidence of IFP. Moreover, we were able to measure accurately and precisely the front position and front concentration profile as a function of time by monitoring IFF systems and controls of various initiator concentrations and cure temperatures. The experimental data were compared with theoretical predictions from a model using mass-diffusion and radical polymerization kinetics. The model reproduced the decrease of the propagation time and showed an increase in the propagation velocity for an increase in the initiator concentration and/or cure temperature.
KW - Imaging
KW - Isothermal frontal polymerization
KW - Laser line deflection (Weiner's method)
KW - Radical polymerization
KW - Refractive index
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U2 - 10.1002/pola.21019
DO - 10.1002/pola.21019
M3 - Article
AN - SCOPUS:30544452169
SN - 0887-624X
VL - 43
SP - 5774
EP - 5786
JO - Journal of Polymer Science, Part A: Polymer Chemistry
JF - Journal of Polymer Science, Part A: Polymer Chemistry
IS - 23
ER -