Cationic polymerization of emulsified epoxy resins

Walker, Frederick H.; Dickenson, John B.; Hegedus, Charles R.; Pepe, Frank R.

doi:10.1016/s0300-9440(02)00107-8

Cited by 18 publications

(8 citation statements)

References 4 publications

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“…A recent paper [15] reported that epoxide polymerisation in emulsion could be catalysed by super-acids, which were found more efficient than usual inorganic acids or sulfonate ones. Particles of about 1 µm in diameter were stabilised by a non-ionic surfactant, which does not participate in the polymerisation.…”

Section: Changing the Initiating Systemmentioning

confidence: 99%

On the key role of the interface in the cationic polymerisation of p-methoxystyrene in miniemulsion

2003

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This paper presents the latest improvements, in terms of reactivity and molar masses, of the process of cationic polymerisation of p-methoxystyrene in miniemulsion, which was published previously [Cauvin et al., Macromolecules 2002, 35, 7919]. The formulation was adapted to change dramatically the specific surface and the polarity of the interface where the polymerisation takes place. Adding hexadecane permits to significantly decrease the particle diameter and thus to favour a faster polymerisation rate. In addition, droplets generated by sonication are ideally covered by the INISURF (initiator/surfactant) dodecylbenzenesulfonic acid and nucleate quantitatively (true miniemulsion polymerisation). Hexadecane addition finally ensures a better stability of the polymerised dispersion. A more hydrophobic acidic surfactant, though used at much smaller concentrations, again allowed increasing the polymerisation rate. Both systems, however, show no improvements in terms of molar masses compared to those observed previously. By separating the initiating agent (a super acid such as triflic acid) from the surfactant (a non-ionic one) an increase of molar masses is obtained but accompanied by an important drop of the polymerisation rate.

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Section: Changing the Initiating Systemmentioning

confidence: 99%

On the key role of the interface in the cationic polymerisation of p-methoxystyrene in miniemulsion

2003

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“…Then the material was crosslinked using hydroxy telechelic PDMS and a condensation catalyst like dibutyltin dilaurate to obtain reinforced siloxane elastomers. The reactions of epoxy groups in water dispersions have been studied by Walker et al [12,13] in original papers. They demonstrated that the cationic polymerization of liquid epoxy resin in suspension using superacid catalysts yields polymeric polyols.…”

Section: Communicationmentioning

confidence: 99%

Direct Synthesis of PVA‐g‐PDMS in Microsuspension

Pouget¹,

Garcia²,

Ganachaud³

2008

Macromol. Rapid Commun.

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International audienceThe synthesis of P(VA-co-VAc)-graft-PDMS copolymers has been achieved in microsuspension by direct reaction between an epoxy-terminated PDMS and some pendant alcohol groups in P(VA-co-VAc). In this synthesis, the copolymer is used both as dispersant and reactant. The hydrophilic/hydrophobic character of the final material can be varied at will by incorporating various contents of epoxy-functionalized PDMS through optimized reaction conditions. The final composition was determined by TGA and 1H NMR. Products prepared from monofunctional PDMS were easily redispersed in water whereas a film of crosslinked materials, arising from difunctional PDMS, showed the best waterproofing as shown by contact angle analysis

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“…The previous researches regarding the film formers of emulsion‐type epoxy‐sizing agents have been mainly concentrated on traditional epoxy resins. Most of the generally employed epoxy resins belong to diglycidyl ether of bisphenol A (DGEBA), such as E‐54, E‐51, and E‐44.…”

Section: Introductionmentioning

confidence: 99%

Preparation of emulsion‐type thermotolerant sizing agent for carbon fiber and the interfacial properties of carbon fiber/epoxy resin composite

Liu

2015

J of Applied Polymer Sci

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A modified resin was synthesized through the reaction between dodecylamine and tetraglycidyldiaminodiphenylmethane (TGDDM), which was used as the film former of sizing agent for carbon fiber (CF). The sizing agents were prepared through phase inversion emulsification method. Fourier transform infrared spectroscopy (FTIR) was utilized to analyze the modified resin. Particle sizes of the sizing agents were tested to evaluate their stabilities. Differential scanning calorimetry (DSC) results demonstrated that the glass transition temperature (T g ) of the modified TGDDM is much higher than the T g of the cured epoxy resin E-44. The influences of the sizing treatment on CF were investigated by abrasion resistance, fluffs, and stiffness tests. The maximum abrasion resistance increased by 172.8%, compared with the abrasion resistance of the desized CF. Interlaminar shear strength (ILSS) results of the CF/ TGDDM composites indicated that the interfacial adhesion between CF and matrix resin was greatly improved after CF was sized. The maximum ILSS value could obtain a 29.16% improvement, compared with the ILSS of the desized CF composite. V C 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 41882.

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Cationic polymerization of emulsified epoxy resins

Cited by 18 publications

References 4 publications

On the key role of the interface in the cationic polymerisation of p-methoxystyrene in miniemulsion

On the key role of the interface in the cationic polymerisation of p-methoxystyrene in miniemulsion

Direct Synthesis of PVA‐g‐PDMS in Microsuspension

Preparation of emulsion‐type thermotolerant sizing agent for carbon fiber and the interfacial properties of carbon fiber/epoxy resin composite

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