Frontal polymerization with encapsulated initiator

Urdiales, E.; Volpert, Vladimir A.

doi:10.1007/s10665-009-9322-y

Cited by 3 publications

(2 citation statements)

References 15 publications

(23 reference statements)

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“…The parameter γ is inversely proportional to the Zeldovich number Z which can be regarded as the nondimensional activation energy of the reaction. Typical values of β and γ in free-radical polymerization are near 0.05 and 0.14, respectively [16].…”

Section: Mathematical Modelmentioning

confidence: 99%

Linear stability analysis of spherically propagating thermal frontal polymerization waves

Urdiales¹,

Volpert²

2010

J Eng Math

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Spherically propagating frontal polymerization (FP) waves were observed for the first time in condensed media. After a brief period of ignition in a spherical domain by an external UV source, the front began to expand radially. Once the front attained a critical size, it became unstable, resulting in so-called 'spin modes'. These spin modes are manifested as slightly raised regions that travel on the surface of the expanding spherical front. The onset of these instabilities from a stable, uniformly propagating spherical front can be described by a linear stability analysis. The bifurcation parameter is the Zeldovich number which is related to the activation energy of the reaction. A basic solution was constructed which describes a spherically symmetric outward propagating front of radius R. An asymptotic analysis was then employed under the assumption that R is large. This corresponds to the case where the conditions of ignition do not affect front propagation. It was found to leading order that the front propagates at a constant velocity and corrections to velocity due to curvature have been determined. The linear stability analysis shows that for the Zeldovich number in a certain range, there exists a situation in which the sphere will be unstable but will recover its stability in time as it expands.

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Section: Mathematical Modelmentioning

confidence: 99%

Linear stability analysis of spherically propagating thermal frontal polymerization waves

Urdiales¹,

Volpert²

2010

J Eng Math

Self Cite

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“…(i.e., without exploding if adiabatically polymerized) (2) Energy saving: the reaction is maintained by heat released by the reaction itself. (3) It can reduce waste production and maintain the unique morphology of the product . So far, FP has been used to develop various robust materials, such as thermochromic materials , functionally gradient materials and epoxy resins/polyurethane .…”

Section: Introductionmentioning

confidence: 99%

Frontal polymerization of superabsorbent polymers based on vermiculite with slow release of urea

Yuan

Qiu

et al. 2016

Polymer Engineering & Sci

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Poly(acrylic acid-co-acrylamide)/sodium carboxymethyl cellulose/vermiculite (VMT) superabsorbent polymers (SAPs) were prepared by frontal polymerization (FP), a kind of polymerization model characterized by short reaction times and low-energy consumption. The effects of VMT content and monomer ratios on frontal parameters and water absorbency were investigated. Due to the good heat insulation property of VMT, the propagating front still sustained at high VMT concentrations (over 30%). The preparation of SAPs with high VMT-loading via FP has advantages of low energy consumption and low materials prices, decreasing the cost of SAPs effectively. SAPs with slow-release fertilizer (SSRF) were obtained by embedding urea into their networks during the FP process. The addition of urea not only endows SAPs with slow release function of urea (more than 30 days in soil), but also increases their water absorbency (by 17.4%). The effects of obtained SSRF on tall fescue seeds germination and growth were studied. Compared with the control group, the germination rate and vigor index of tall fescue seeds applied SSRF with 10% urea increased by 17.5 and 80.2%, respectively. POLYM. ENG. SCI., 57:69-77, 2017.

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Frontal polymerization with encapsulated monomer

Urdiales¹,

Volpert²

2009

J Math Chem

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Frontal polymerization with encapsulated initiator

Cited by 3 publications

References 15 publications

Linear stability analysis of spherically propagating thermal frontal polymerization waves

Linear stability analysis of spherically propagating thermal frontal polymerization waves

Frontal polymerization of superabsorbent polymers based on vermiculite with slow release of urea

Frontal polymerization with encapsulated monomer

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