Effect of the introduction of methoxy branches on low-temperature relaxations and fracture toughness of epoxide resins

Ochi, Mitsukazu; Shiba, Takuma; Takeuchi, Hidenao; Yoshizumi, Makoto; Shimbo, Masaki

doi:10.1016/0032-3861(89)90084-0

Cited by 26 publications

(21 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…When using PCP, the α ′ relaxation peaks based on the modifiers were observed in the region of T g of PCP by dynamic viscoelastic analysis. It is reported that the presence of the relaxation peak near room temperature was effective in improving the toughness of the epoxy resin because of the increase in the plastic deformation zone attributed to the increase in temperature at the crack front 27. 28 We also reported that several relaxations at temperatures higher than 50 °C contribute to the toughening of epoxies in the modification of the DDS‐cured DGEBA resins with butyl acrylate–glycidyl acrylate copolymers 29…”

Section: Discussionmentioning

confidence: 82%

Preparation of poly(1,4-cyclohexylenedimethylene phthalate)s and their use as modifiers for aromatic diamine-cured epoxy resin

2000

View full text Add to dashboard Cite

Section: Discussionmentioning

confidence: 82%

Preparation of poly(1,4-cyclohexylenedimethylene phthalate)s and their use as modifiers for aromatic diamine-cured epoxy resin

2000

View full text Add to dashboard Cite

“…Ochi et al reported that the presence of the ␤-relaxation peak near room temperature was effective in improving the toughness of epoxies because the increase in the plastic deformation zone contributed to the increase in temperature at the crack front. 38,39 We also reported that several relaxations at more than 50°C contribute to toughening of epoxies in the modification of the DDScured DGEBA resins with butyl acrylate-glycidyl acrylate copolymers. 40 Recently, we reported that the existence of the relaxations near room temperature is important to improve the brittleness of epoxies in the modification of the DDS-cured DGEBA resins with PEP, PBP, and related copolyesters.…”

Section: Toughening Mechanismmentioning

confidence: 93%

Modification of cyanate ester resin by poly(ethylene phthalate) and related copolyesters

Iijima

Katsurayama

Fukuda

et al. 2000

J. Appl. Polym. Sci.

View full text Add to dashboard Cite

Aromatic polyesters were prepared and used to improve the brittleness of the cyanate ester resin. The aromatic polyesters include poly(ethylene phthalate) (PEP) and poly(ethylene phthalate-co-1,4-phenylene phthalate). The polyesters were effective modifiers for improving the brittleness of the cyanate ester resin. For example, inclusion of 20 wt % PEP (MW 19,800) led to a 120% increase in the fracture toughness (K IC ) with retention in flexural properties and a slight loss of the glass transition temperature compared to the mechanical and thermal properties of the unmodified cured cyanate ester resin. The microstructures of the modified resins were examined by scanning electron microscopy and dynamic viscoelastic analysis. The thermal stability of the modified resins was lower than that of the unmodified resin as determined by thermogravimetric analysis. The water absorptivity of the modified resin increased significantly, compared to that of the unmodified cured cyanate ester resin. The toughening mechanism was discussed in terms of the morphological and dynamic viscoelastic behaviors of the modified cyanate ester resin system.

show abstract

“…The α′‐relaxation peak was also observed in the present modification. It is reported that the presence of the relaxation peak near room temperature was effective in improving the toughness of the epoxy resin because of the increase in the plastic deformation zone attributed to the increase in temperature at the crack front 33, 34. We also reported that several relaxations at >50°C contribute to toughening of epoxies in the modification of the DDS‐cured DGEBA resins with butyl acrylate‐glycidyl acrylate copolymers 35…”

Section: Discussionmentioning

confidence: 68%

Toughening of cycloaliphatic epoxy resins by poly(ethylene phthalate) and related copolyesters

Iijima

Fujimoto

Tomoi

2002

J of Applied Polymer Sci

View full text Add to dashboard Cite

Poly(ethylene phthalate) (PEP) and poly(ethylene phthalate-co-ethylene terephthalate) were used to improve the brittleness of the cycloaliphatic epoxy resin 3,4-epoxycyclohexylmethyl 3,4-epoxycyclohexane carboxylate (Celoxide 2021™), cured with methyl hexahydrophthalic anhydride. The aromatic polyesters used were soluble in the epoxy resin without solvents and effective as modifiers for toughening the cured epoxy resin. For example, the inclusion of 20 wt % PEP (MW, 7400) led to a 130% increase in the fracture toughness (K IC ) of the cured resin with no loss of mechanical and thermal properties. The toughening mechanism is discussed in terms of the morphological and dynamic viscoelastic behaviors of the modified epoxy resin system.

show abstract

Effect of the introduction of methoxy branches on low-temperature relaxations and fracture toughness of epoxide resins

Cited by 26 publications

References 13 publications

Preparation of poly(1,4-cyclohexylenedimethylene phthalate)s and their use as modifiers for aromatic diamine-cured epoxy resin

Preparation of poly(1,4-cyclohexylenedimethylene phthalate)s and their use as modifiers for aromatic diamine-cured epoxy resin

Modification of cyanate ester resin by poly(ethylene phthalate) and related copolyesters

Toughening of cycloaliphatic epoxy resins by poly(ethylene phthalate) and related copolyesters

Contact Info

Product

Resources

About