✦ LIBER ✦

A study on the properties of epoxy resin toughened by a liquid crystal-type oligomer

✍ Scribed by Bao-Long Zhang; Guang-Liang Tang; Ke-Yu Shi; Ying-Cai You; Zong-Jie Du; Ji-Fu Huang

Publisher: John Wiley and Sons
Year: 1999
Tongue: English
Weight: 271 KB
Volume: 71
Category: Article
ISSN: 0021-8995
DOI: 10.1002/(sici)1097-4628(19990103)71:1<177::aid-app20>3.0.co;2-p

No coin nor oath required. For personal study only.

✦ Synopsis

A series of novel reactive toughening agents (LCEU PPG ) containing both a flexible spacer and rigid liquid crystalline unit were synthesized to modify the bisphenol epoxy resin/dicyandiamide curing system. The curing reactivity, apparent activation energy, curing mechanism, dynamic mechanical behavior, and impact strength of the modified system were systematically studied. Compared with the unmodified system, the results indicate that LCEU PPG have greatly accelerated the curing reaction between epoxy resin and dicyandiamide, reduced the apparent activation energy of the curing reaction, enhanced the impact strength 3-7 times, and maintained high dynamic modulus and good thermal properties. In addition, SEM observation of the fracture surfaces showed a two-phase microstructure in the modified systems.

📜 SIMILAR VOLUMES

Influence of curing conditions on the mo

Influence of curing conditions on the morphology and physical properties of epoxy resins modified with a liquid polyamine

✍ M. Franco; M. A. Corcuera; Jna. Gavaldà; A. Valea; I. Mondragon 📂 Article 📅 1997 🏛 John Wiley and Sons 🌐 English ⚖ 223 KB 👁 1 views

A diglycidyl ether of bisphenol-A ( DGEBA ) epoxy resin has been stoichiometrically cured with cycloaliphatic amine 4,4-diamino-3,3-dimethylcyclohexylmethane (3DCM) and modified with an amine terminated oligomer polyoxypropylenetriamine (POPTA) at a concentration of 15 wt %. Mixtures, postcured at t

Epoxy networks toughened by core–Shell p

Epoxy networks toughened by core–Shell particles: Influence of the particle structure and size on the rheological and mechanical properties

✍ L. Bécu-Longuet; A. Bonnet; C. Pichot; H. Sautereau; A. Maazouz 📂 Article 📅 1999 🏛 John Wiley and Sons 🌐 English ⚖ 193 KB 👁 1 views

The core-shell particles considered were poly(butyl acrylate) core/epoxy groups functionalizing the poly(methyl methacrylate) shell. Physical and thermomechanical properties of benzyl dimethylamine (BDMA)-catalyzed diglycidyl ether of bisphenol A (DGEBA)/dicyandiamine epoxy networks toughened with c

Studies on new type of phenolic resin (I

Studies on new type of phenolic resin (IX) curing reaction of bisphenol A-based benzoxazine with bisoxazoline and the properties of the cured resin. II. Cure reactivity of benzoxazine

✍ Hajime Kimura; Shuuichi Taguchi; Akihiro Matsumoto 📂 Article 📅 2001 🏛 John Wiley and Sons 🌐 English ⚖ 215 KB 👁 1 views

Bisphenol A-based benzoxazine that contained oligomers (oligo-Ba) was prepared from bisphenol A, formaline, and aniline. Curing reaction of oligo-Ba with bisoxazoline and the properties of the cured resin were investigated. Consequently, the ring-opening reaction of benzoxazine ring occurred, and th