Free radical-scavenging dyes as indicators of frontal polymerization dynamics

Masere, Jonathan

doi:10.1039/a707270h

Cited by 29 publications

(39 citation statements)

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“…In fact, if an inert diluent, such as DMSO is added, the spins modes are more apparent even though the front temperature is reduced. Masere and Pojman found spin modes in the FP of a diacrylate at ambient conditions [98]. Thus, although the mechanical quality of the resultant polymer material can be improved by using multifunctional acrylates, spin modes may appear and a nonuniform product may result.…”

Section: Effect Of Complex Kineticsmentioning

confidence: 99%

Frontal Polymerization

Pojman

2010

Nonlinear Dynamics With Polymers

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Section: Effect Of Complex Kineticsmentioning

confidence: 99%

Frontal Polymerization

Pojman

2010

Nonlinear Dynamics With Polymers

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“…Spin modes at room temperature were first observed by Masere and Pojman in the frontal polymerization of a diacrylate. 18 The number of hot spots was effected by the front temperature, which was controlled by an inert diluent, and by the degree of crosslinking, which was controlled by varying the ratio of a monoacrylate to a multifunctional acrylate. Masere et al experimentally showed how a change in the front behavior occurred when the percentage of a reactive diluent is varied while keeping T max constant.…”

Section: ͑1͒mentioning

confidence: 99%

The effect of reactor geometry on frontal polymerization spin modes

Pojman

Masere

Petretto

et al. 2002

Chaos: An Interdisciplinary Journal of Nonlinear Science

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Using reactors of different sizes and geometries the dynamics of the frontal polymerization of 1,6-hexanediol diacrylate (HDDA) and pentaerythritol tetraacrylate (PETAC), with ammonium persulfate as the initiator were studied. For this system, the frontal polymerization exhibits complex behavior that depends on the ratio of the monomers. For a particular range of monomers concentration, the polymerization front becomes nonplanar, and spin modes appear. By varying the reactor diameter, we experimentally confirmed the expected shift of the system to a greater number of "hot spots" for larger diameters. For square test tubes a "zig-zag" mode was observed for the first time in frontal polymerization. We confirmed the viscosity-dependence of the spin mode instabilities. We also observed novel modes in cylinder-inside-cylinder reactors. Lastly, using a conical reactor with a continuously varying diameter, we observed what may be evidence for bistability depending on the direction of propagation. We discuss these finding in terms of the standard linear stability analysis for propagating fronts. (c) 2002 American Institute of Physics.

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“…Masere and Pojman studied the frontal polymerization of multifunctional acrylates using Lupersol and did not have the problem of bubbles in plastic-capped test tubes. 8 No explosions occurred because of the low volatility of the monomer and the low amount of gas evolved from the Luperox 231. The other alternative is the use of initiators that do not produce gaseous byproducts.…”

Section: Introductionmentioning

confidence: 99%