Front velocity dependence on vinyl ether and initiator concentration in radical‐induced cationic frontal polymerization of epoxies

2021 ◽  
Author(s):  
Brecklyn R. Groce ◽  
Daniel P. Gary ◽  
Joseph K. Cantrell ◽  
John A. Pojman
Keyword(s):  
Vinyl Ether ◽  
Front Velocity ◽  
Frontal Polymerization ◽  
Velocity Dependence ◽  
Initiator Concentration

Interpenetrating polydicyclopentadiene/polyacrylate networks obtained by simultaneous non-interfering frontal polymerization

e-Polymers ◽  
2002 ◽  
Vol 2 (1) ◽  
Author(s):  
Stefano Fiori ◽  
Alberto Mariani ◽  
Laura Ricco ◽  
Saverio Russo
Keyword(s):  
Free Radical ◽  
Polymer Networks ◽  
Interpenetrating Polymer Networks ◽  
Front Velocity ◽  
Frontal Polymerization ◽  
Maximum Temperature ◽  
Glycol Dimethacrylate ◽  
Monomer Ratio ◽  
Free Radical Initiator

AbstractInterpenetrating polymer networks made of dicyclopentadiene and methyl methacrylate or tri(ethylene glycol) dimethacrylate have been successfully prepared by non-interfering frontal polymerization. The role of catalyst and free radical initiator relative amounts, as well as of monomer ratio, has been thoroughly studied. The conditions under which a pure frontal polymerization occurs, and the related values of both front velocity and maximum temperature reached by the reaction, are presented and discussed.

Synthesis and characterization of a polyester/styrene resin obtained by frontal polymerization

e-Polymers ◽  
2002 ◽  
Vol 2 (1) ◽  
Author(s):  
Stefano Fiori ◽  
Giulio Malucelli ◽  
Alberto Mariani ◽  
Laura Ricco ◽  
Elena Casazza
Keyword(s):  
Free Radical ◽  
Mechanical Behaviour ◽  
Unsaturated Polyester ◽  
Front Velocity ◽  
Frontal Polymerization ◽  
Maximum Temperature ◽  
Synthesis And Characterization ◽  
Free Radical Initiator ◽  
First Time

AbstractThe frontal polymerization technique has been successfully applied, for the first time, to obtain an unsaturated polyester/styrene resin. The effect of the ratio of the two aforementioned components, as well as of the type and amount of free-radical initiator on both front velocity and maximum temperature reached by the front, has been thoroughly studied. The resulting products have been characterized in terms of their thermal and dynamic-mechanical behaviour. A comparison of such products with the corresponding materials obtained by the classical batch polymerization technique has evidenced that frontal polymerization allows to reach a higher degree of crosslinking with respect to batch copolymerization and hence a better thermal and mechanical behaviour.

scholarly journals Stabilization of the front at frontal copolymerization of acrylamide with sodium acrylate in aqueous solutions

2020 ◽  
pp. 40-47
Author(s):  
Alena A. Salamevich ◽  
Yauheni V. Hryniuk ◽  
Leonid P. Krul
Keyword(s):  
Aqueous Solution ◽  
Molecular Weight ◽  
Aqueous Solutions ◽  
Water Absorption ◽  
High Molecular Weight ◽  
Frontal Polymerization ◽  
Sodium Acrylate ◽  
Initial Reaction ◽  
Initiator Concentration ◽  
Initial Reaction Mixture

The objects of research were the process of frontal copolymerization of acrylamide with sodium acrylate in aqueous solutions, as well as the copolymers and hydrogels thus obtained. It has been shown that the frontal polymerization of acrylamide with sodium acrylate in an aqueous solution of high molecular weight polyacrylamide helps to reduce the initiator concentration necessary for the process and the formation of non-crosslinked copolymers. The effect of the addition of aerosil in the initial reaction mixture on the parameters of the copolymerization process and on the properties of the products formed is studied. The values of water absorption and gel fractions of the obtained hydrogels were determined.

NIR-sensitized cationic frontal polymerization of vinyl ether and epoxy monomers

2021 ◽  
Vol 153 ◽  
pp. 106149
Author(s):  
Yangyang Xin ◽  
Shizhuo Xiao ◽  
Yulian Pang ◽  
Yingquan Zou
Keyword(s):  
Vinyl Ether ◽  
Frontal Polymerization

scholarly journals Binary frontal polymerization: Velocity dependence on initial composition

e-Polymers ◽  
2004 ◽  
Vol 4 (1) ◽  
Author(s):  
John A. Pojman ◽  
Jerry Griffith ◽  
H. Archie Nichols
Keyword(s):  
Propagation Velocity ◽  
Binary Systems ◽  
Reaction Rate ◽  
Front Propagation ◽  
Analytical Description ◽  
Frontal Polymerization ◽  
Velocity Dependence ◽  
Initial Composition ◽  
Arrhenius Dependence ◽  
Front Propagation Velocity

Abstract Frontal polymerization is a mode of polymerization in which a localized zone of reaction propagates through the coupling of thermal diffusion and the Arrhenius dependence of the reaction rate. The dependence of the front propagation velocity on the initial composition has been determined in initially miscible binary systems of a free-radically cured diacrylate and an amine- or cationically cured epoxy resin. A minimum of the velocity as a function of the monomer mole fraction is observed if the two polymerizations occur independently. Excellent agreement with an analytical description was found with the diacrylate and an amine-cured epoxy but not for a diacrylate and a cationically cured one because of the effect of HCl impurities on the peroxide.

Synthesis and characterization of unsaturated polyester resins cured by frontal polymerization

e-Polymers ◽  
2004 ◽  
Vol 4 (1) ◽  
Author(s):  
Stefano Fiori ◽  
Alberto Mariani ◽  
Simone Bidali ◽  
Giulio Malucelli
Keyword(s):  
Thermal Properties ◽  
Maleic Anhydride ◽  
Unsaturated Polyester ◽  
Front Velocity ◽  
Frontal Polymerization ◽  
Maximum Temperature ◽  
Synthesis And Characterization ◽  
Polyester Resins ◽  
Crosslinking Agents

Abstract Various crosslinking agents have been used to frontally cure the unsaturated polyester derived by the reaction of maleic anhydride and 1,2-propanediol. The effect of composition of the curing mixture on the front velocity and its maximum temperature, as well as on the thermal properties of the obtained materials, is described.

Thermal gravimetric analysis of in-situ crosslinked nanocellulose whiskers • poly(methyl vinyl ether-co-maleic acid) • polyethylene glycol

TAPPI Journal ◽  
2011 ◽  
Vol 10 (4) ◽  
pp. 29-33
Author(s):  
LEE A. GOETZ ◽  
AJI P. MATHEW ◽  
KRISTIINA OKSMAN ◽  
ARTHUR J. RAGAUSKAS
Keyword(s):  
Thermal Stability ◽  
Polyethylene Glycol ◽  
Vinyl Ether ◽  
Thermal Gravimetric Analysis ◽  
Maleic Acid ◽  
Gravimetric Analysis ◽  
Thermal Gravimetric ◽  
Methyl Vinyl ◽  
Methyl Vinyl Ether

The thermal stability and decomposition of in-situ crosslinked nanocellulose whiskers – poly(methyl vinyl ether-co-maleic acid) – polyethylene glycol formulations (PMVEMA-PEG), (25%, 50%, and 75% whiskers) – were investigated using thermal gravimetric analysis (TGA) methods. The thermal degradation behavior of the films varied according to the percent cellulose whiskers in each formulation. The presence of cellulose whiskers increased the thermal stability of the PMVEMA-PEG matrix.

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