Nonlinear Dynamics in Frontal Polymerization

Popwell, Sammy J.; Fortenberry, Dionne I.; Volpert, Vitaly; Volpert, Vladimir A.

doi:10.1021/bk-2004-0869.ch009

Cited by 14 publications

(14 citation statements)

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“…Pojman et al made a similar observation in square reactors [103]. Pojman et al studied the dependence of spin modes on viscosity with the FP of HDDA with persulfate initiator [106]. They found that the number of spins was independent of the viscosity until a critical viscosity was reached, at which point the spins vanished.…”

Section: Effect Of Buoyancymentioning

confidence: 81%

Frontal Polymerization

Pojman

2010

Nonlinear Dynamics With Polymers

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Section: Effect Of Buoyancymentioning

confidence: 81%

Frontal Polymerization

Pojman

2010

Nonlinear Dynamics With Polymers

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“…Such nonplanar modes of propagation have been the subject of much investigation. 40,[45][46][47][48][49][50][51] The complexity of the front increases with the value of the effective energy of activation. By reducing the number of propagating radicals, the transition metal reduces the contribution of the energy of activation for the termination step, which increases the effective activation energy.…”

Section: Resultsmentioning

confidence: 99%

“…By reducing the number of propagating radicals, the transition metal reduces the contribution of the energy of activation for the termination step, which increases the effective activation energy. 49,50 To increase the production of free radicals, two reductants were separately tested: benzoin and 6-O-palmitoyl-L-ascorbic acid. The reductant plays an important role in reestablishing the oxidation state.…”

Section: Resultsmentioning

confidence: 99%

Thermal frontal polymerization with a thermally released redox catalyst

Parrinello

Bounds

Liveri

2012

J. Polym. Sci. A Polym. Chem.

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We studied thermal frontal polymerization using a redox system in an attempt to lower the temperature of the frontally polymerizable system while increasing the front velocity so as to obtain a self-sustaining front in a thinner layer than without the redox components. A cobalt-containing polymer with a melting point of 63 C (Intelimer 6050X11) and cumene hydroperoxide were used with a triacrylate. The use of the Intelimer decreased the front velocity but allowed fronts to propagate in thinner layers and with more filler while still having a pot life of days. Nonplanar modes of propagation occurred. Fronts propagated faster when 6-O-palmitoyl-L-ascorbic acid was used as a reductant. Interestingly, fronts were also faster with the reductant even without the Intelimer if kaolin clay was the filler; however, the pot life was significantly reduced.

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“…The reaction accelerates itself as the polymerization proceeds as a result of a positive feedback loop generated by the increase in heat as well as in viscosity and the diffusion-controlled termination of the polymerization process [48,49]. An example is illustrated in Figure 6.5 for a mixture of a polystyrene doubly labeled with anthracene and fluorescein (PSAF) dissolved in MMA monomer [50].…”

Section: Reaction Kinetics In the Liquid State Of Polymer Mixturesmentioning

confidence: 99%

Reaction‐Induced Phase Separation of Polymeric Systems under Stationary Nonequilibrium Conditions

Nakanishi

Fujiki

Van‐Pham

et al. 2010

Nonlinear Dynamics With Polymers

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Cong-Miyata IntroductionFor most cases, materials processing is carried out under various conditions far from equilibrium where the temperature, concentration, or pressure is not constant, but is, in general, a function of time and space. Under such stationary nonequilibrium conditions, coupling among the different variables such as diffusion, concentration, temperature, density, or surface tension distribution can lead to a wide variety of instabilities such as double diffusion, Mullins-Sekerka, RayleighBenard, Rayleigh-Taylor, and so on [1-3]. As a consequence, for a physicochemical system undergoing phase separation far from thermodynamic equilibrium, one can expect the emergence of various exotic morphologies whereby functional materials can be designed and utilized.In this chapter, we will show that, by using ultraviolet (UV) irradiation to induce and maintain phase separation under stationary nonequilibrium conditions, morphologies that cannot be generated under thermal equilibrium conditions can be produced and controlled by taking advantage of the competition between phase separation and photochemical reactions. At first, theories and numerical calculation of phase separation kinetics in both nonreacting and reacting systems are briefly overviewed, together with the experimental results on reaction kinetics in polymeric mixtures. Here, the nonuniform kinetics observed for mixtures in both the bulk and liquid states containing monomers is summarized. Emphasis is particularly given for the autocatalytic behavior of the reaction and its consequence on the phase separation kinetics and the resulting morphology. By taking advantage of the gradient of light intensity in an irradiated sample, morphology with spatially graded structures is constructed and controlled. Emergence of an elastic strain field accompanying the cross-linking process in polymer mixtures is monitored and analyzed by using Mach-Zehnder interferometry. The development and relaxation of this reaction-induced strain field are described, together with its influence on the morphology of the reacting polymer mixtures. Finally, results on the temporal modulation experiments of phase separation are briefly summarized. The conclusions are provided at the end of this chapter, together with some Nonlinear Dynamics with Polymers: Fundamentals, Methods and Applications. Edited by John A. Pojman and Qui Tran-Cong-Miyata

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Nonlinear Dynamics in Frontal Polymerization

Cited by 14 publications

References 1 publication

Frontal Polymerization

Frontal Polymerization

Thermal frontal polymerization with a thermally released redox catalyst

Reaction‐Induced Phase Separation of Polymeric Systems under Stationary Nonequilibrium Conditions

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