Nanocomposites based on a combination of epoxy resin, hyperbranched epoxy and a layered silicate

Ratna, Debdatta; Becker, O.; Krishnamurthy, R.; Simon, George P; Varley, Russell J.

doi:10.1016/j.polymer.2003.08.035

Cited by 156 publications

(87 citation statements)

References 31 publications

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“…8, it is observed that the 001 reflections of organoclay is present in the cured product indicating the regular insertion of CMDI-toughened epoxy resin in between the silicate layers and disrupting the crystalline structure of the clay particles. This in turn confirms the formation of intercalated nanocomposites [40,42]. The above data clearly explains that the incorporation of organoclay influence the formation of CMDI-toughened epoxy-clay nanocomposites.…”

Section: X-ray Diffraction Studiessupporting

confidence: 70%

“…The clay addition has a considerable effect in the stiffness behavior of the nanocomposites which affects the dynamic mechanical properties of the nanocomposites. The clay addition increased the storage modulus (E 0 ) [39,40]. When compared with the unmodified epoxy system, the storage modulus of the CMDI-toughened epoxy clay nanocomposites system was increased by 11% (from 6215 to 6873 MPa).…”

Section: Mechanical Propertiesmentioning

confidence: 99%

“…The XRD patterns of organoclay-filled CMDItoughened epoxy systems suggest the formation of intercalated nanohybrids. This is due to the compatibility of epoxy resin with the layered silicates, and the epoxy chain penetrates into the gallery and expands the nanosize to some extent [40,41,42]. When 2y ¼ 0.5-108, (the angle between the diffracted and incoming X-ray waves), the d 001 spacing of the CMDI-toughened epoxy nanocomposites is in nanolevel.…”

Section: X-ray Diffraction Studiesmentioning

confidence: 99%

See 2 more Smart Citations

Organoclay‐filled caprolactam‐blocked methylenediphenyl diisocyanate‐toughened epoxy interpenetrating network matrices

Premkumar

Chozhan

Alagar

2009

Polymer Engineering & Sci

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An interpenetrating networks of varying weight percentages (5, 10, and 15%) of caprolactam-blocked methylenediphenyl diisocyanate(CMDI)-toughened epoxy matrices were developed and characterized. The toughened epoxy system was further modified with 1, 3, and 5% (by wt) of organophilic montmorillonite (MMT) clay. Organoclay-filled hybrid CMDI-epoxy matrices, developed in the form of castings, were characterized for their thermomechanical properties. The data obtained from differential scanning calorimetry and dynamic mechanical analysis showed that there was a significant loss in the values of glass transition temperatures (T g ) of organoclay-filled hybrid epoxy systems when compared with that of neat epoxy resin, whereas increasing trend in thermal stability was observed. The values obtained from mechanical studies indicated that the CMDI-toughened epoxy and organoclay-filled CMDI-epoxy systems were improved the mechanical properties according to its percentage concentration. From X-ray diffraction analysis, it was observed that the presence of d 001 reflections of the organophilic MMT clay in the CMDI-toughened epoxy systems indicated the development of intercalated clay structure which in turn confirmed the formation of intercalated nanocomposites. Homogeneous surface morphologies of CMDI-toughened epoxy and organoclay-filled CMDItoughened epoxy systems were ascertained from scanning electron microscope. POLYM. ENG. SCI., 49:747-755, 2009. ª

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Section: X-ray Diffraction Studiessupporting

confidence: 70%

Section: Mechanical Propertiesmentioning

confidence: 99%

Section: X-ray Diffraction Studiesmentioning

confidence: 99%

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Organoclay‐filled caprolactam‐blocked methylenediphenyl diisocyanate‐toughened epoxy interpenetrating network matrices

Premkumar

Chozhan

Alagar

2009

Polymer Engineering & Sci

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“…Ratna et al reported the preparation of epoxy nanocomposites using the diglycidyl ether of bisphenol A (DGEBA) epoxy resins, functionalized hyperbranched polymer, and clay. 7 These nanocomposites exhibited higher impact strength than neat DGEBA. Li et al prepared and characterized epoxy resin composites modified with SiO 2 nanoparticles and silane.…”

Section: -6mentioning

confidence: 95%

Thermal Stability and Fracture Toughness of Epoxy Resins Modified with Epoxidized Castor Oil and Al₂O₃Nanoparticles

Zhu¹,

Jin

Park

2012

Bulletin of the Korean Chemical Society

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This study examined the effects of the epoxidized castor oil (ECO) and Al 2 O 3 content on the thermal stability and fracture toughness of the diglycidylether of bisphenol-A (DGEBA)/ECO/Al 2 O 3 ternary composites using a range of techniques. The thermal stability of the composites was decreased by the addition of ECO and Al 2 O 3 nanoparticles. The fracture toughness of the composites was improved significantly by the addition of ECO and Al 2 O 3 nanoparticles. The composite containing 3 wt % Al 2 O 3 nanoparticles showed the maximum flexural strength. Scanning electron microscopy (SEM) revealed tortuous cracks in the DGEBA/ECO/Al 2 O 3 composites, which prevented deformation and crack propagation.

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“…[8][9][10] Moreover, only in some of these the HBP has been employed as the main organic phase and not only as an additive in combination with other linear polymers. [11][12][13][14] HBPs belong to a group of macromolecules known as dendritic polymers.…”

Section: Introductionmentioning

confidence: 99%

Hyperbranched Polymer/TiO₂ Hybrid Nanoparticles Synthesized via an In Situ Sol‐Gel Process

Gianni

Trabelsi

Rizza

et al. 2007

Macro Chemistry & Physics

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Two different kinds of HBPs were used in the preparation of nanocomposite materials based on TiO 2 nanoparticles. One of the HBPs was characterized by the presence of free OH end groups in its structure, while the other one was obtained via a partial modification reaction which allowed to introduce some alkoxysilane functional groups. The TiO 2 particles were prepared in situ in the polymer solution by means of a sol-gel process starting from Ti(iOPr) 4 as precursor. The polymer/TiO 2 mixture, subsequently coated and cured in the presence of diisocyanate, gave rise to a hard coating. TiO 2 was found to be dispersed on nanometer scale inside the final coatings obtained from both the polymers, and the TiO 2 nanocomposite coatings were also characterized by improved thermal and hardness properties compared to TiO 2 free systems. Still the two different kinds of HBPs showed a different interaction with the TiO 2 particles, and it has been evidenced that the modification is required to achieve a better dispersion of the particles in the matrix and better properties for the final coating. Thus, by applying the modified HBP, TiO 2 could be dispersed and stabilized in the polymer matrix as individual nanoparticles of only 6 nm in diameter.

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Nanocomposites based on a combination of epoxy resin, hyperbranched epoxy and a layered silicate

Cited by 156 publications

References 31 publications

Organoclay‐filled caprolactam‐blocked methylenediphenyl diisocyanate‐toughened epoxy interpenetrating network matrices

Organoclay‐filled caprolactam‐blocked methylenediphenyl diisocyanate‐toughened epoxy interpenetrating network matrices

Thermal Stability and Fracture Toughness of Epoxy Resins Modified with Epoxidized Castor Oil and Al₂O₃Nanoparticles

Hyperbranched Polymer/TiO₂ Hybrid Nanoparticles Synthesized via an In Situ Sol‐Gel Process

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Nanocomposites based on a combination of epoxy resin, hyperbranched epoxy and a layered silicate

Cited by 156 publications

References 31 publications

Organoclay‐filled caprolactam‐blocked methylenediphenyl diisocyanate‐toughened epoxy interpenetrating network matrices

Organoclay‐filled caprolactam‐blocked methylenediphenyl diisocyanate‐toughened epoxy interpenetrating network matrices

Thermal Stability and Fracture Toughness of Epoxy Resins Modified with Epoxidized Castor Oil and Al2O3Nanoparticles

Hyperbranched Polymer/TiO2 Hybrid Nanoparticles Synthesized via an In Situ Sol‐Gel Process

Contact Info

Product

Resources

About

Thermal Stability and Fracture Toughness of Epoxy Resins Modified with Epoxidized Castor Oil and Al₂O₃Nanoparticles

Hyperbranched Polymer/TiO₂ Hybrid Nanoparticles Synthesized via an In Situ Sol‐Gel Process