Effect of new hyperbranched polyester of varying generations on toughening of epoxy resin through interpenetrating polymer networks using urethane linkages

Dhevi, D. Manjula; Jaisankar, Sellamuthu N.; Pathak, Madhvesh

doi:10.1016/j.eurpolymj.2013.06.041

Cited by 74 publications

(27 citation statements)

References 35 publications

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“…However, epoxy resins suffer from a few drawbacks, the most important being the brittleness caused by their highly crosslinked structure. To fix this brittleness, toughening modification is performed and remains a major target for epoxy resin research [1][2][3][4][5][6][7][8]. Low viscosity is a requirement for a toughener to maintain good processability of the epoxy resin.…”

Section: Introductionmentioning

confidence: 99%

“…Hyperbranched polymers are considered ideal candidates to meet both the toughening and processability requirements [9]. Unfortunately, the incorporation of tougheners with flexible chain segments usually results in a decreased glass transition temperature of the epoxy resin, which decreases their performance, i.e., thermal resistance of final materials [7,10].…”

Section: Introductionmentioning

confidence: 99%

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Epoxy-functionalized star-shaped polymers as novel tougheners for epoxy resin

et al. 2015

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A novel epoxy resin toughener based on star-shaped copolymer of butyl acrylate (BA) and glycidyl methacrylate (GMA) [poly (BA-co-GMA)] with low viscosity was developed. The star polymers were synthesized by initiators for continuous activator regeneration atom transfer radical polymerization (ICAR ATRP) using tri, tetra and hexa-functional initiators. The branching parameters of star poly (BA-co-GMA) were characterized by gel permeation chromatography with a laser light scattering-viscometry triple detection system. Copolymer composition and glass transition temperatures of the copolymers were analyzed by proton nuclear magnetic resonance ( 1 H-NMR) and differential scanning calorimetry (DSC), respectively. The results showed that the branching ratio decreased as the number of arms increased. The epoxide groups of the GMA units were kept intact during ICAR ATRP. Rheological, mechanical tests and dynamic mechanical analysis revealed that star poly (BA-co-GMA)/diglycidyl ether of bisphenol A (DGEBA) epoxy resin formulation exhibited better processability, higher impact resistance and thermal resistance than those of linear poly (BA-co-GMA)/DGEBA epoxy resin formulation.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Epoxy-functionalized star-shaped polymers as novel tougheners for epoxy resin

et al. 2015

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“…14 However, these materials have demonstrated poor resistance at moderate temperatures (30-80 8C) and a low mechanical strength; therefore, it is limited for applications with certain required conditions. 15,16 To improve the usability of PU in damping conditions, in recent years, researchers have tried to increase PU's content of soft segments by introducing polyester or polyether oligomers and by means of interpenetrating polymer networks. [17][18][19][20][21][22] However, increases in the soft segment result in poor mechanical strength, a weakened usability of PU under higher temperature conditions, and a more complex preparation process because of the introduction of interpenetrating polymer networks.…”

Section: Introductionmentioning

confidence: 99%

“…[17][18][19][20][21][22] However, increases in the soft segment result in poor mechanical strength, a weakened usability of PU under higher temperature conditions, and a more complex preparation process because of the introduction of interpenetrating polymer networks. [14][15][16][23][24][25] Lili et al 13 modified PU with polyhydric alcohols, and their results show that the damping capacity and volume shrinkage of the material were enhanced; this was accompanied by decreased thermodynamics and pencil hardness. Bakhshi et al 14 and Jin et al 10 also found that the mechanical strength and hardness of PU modified with soybean oil was obviously weakened at higher temperatures.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of a novel polyurethane curing agent modified by a diazafluorene derivative

Zhou

Chen

et al. 2018

J of Applied Polymer Sci

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In this study, we synthesized a novel polyurethane (PU) curing agent (CA) modified by the diazafluorene derivative, 9,9′‐di(4‐hydroxyphenyl)‐9‐1H‐4,5‐diazafluorene, at different hydroxyl ratios. The results of 1H‐NMR and Fourier transform infrared spectroscopy proved the structure of the fluorine derivative and the modification of CAs. Differential scanning calorimetry and dynamic mechanical analysis showed that the glass‐transition temperature of the PU increased with the addition of the diazafluorene derivative, and the PU cured in the novel CA had more stable and better damping properties under moderate‐temperature conditions (30–80 °C) than the PU cured in the N75 CA. Tan δ was maintained in a relatively lower range shift in the moderate‐temperature range. The average adhesion values of the PU coating cured in the novel CA increased. The scanning electron microscopy morphologies of the PU film and the average adhesion of the coatings showed that the PU cured in the novel CA had good mechanical properties. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46591.

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“…Epoxy resin, which is one of the most important thermosetting polymers, demonstrates many excellent properties, such as high strength and modulus, good electrical insulation, etc. However, epoxy resin is generally brittle due to its highly cross‐linked structure and how to improve the toughness of epoxy thermosets has been a hot spot for researchers both from academic and industry …”

Section: Introductionmentioning

confidence: 99%

The preparation and properties study of methoxy functionalized silicone‐modified epoxy resins

Ren

Zou

Liang

2013

J of Applied Polymer Sci

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In this work, a series of siloxane epoxy resins (E3074) were synthesized through reaction of poly(methylphenylsiloxane) (DC-3074) with epoxy resin. The chemical structure of the resultant epoxy resin was determined by FTIR, GPC, and epoxy equivalent weight (EEW) tests. The mechanical measurements indicated that the tensile strength of E3074 was lower than that of neat epoxy resin after modification, while their elongations at break improved markedly when compared with that of epoxy resin. SEM revealed that the particle size of silicone had a significant effect on the mechanical properties of the modified epoxy resin. TGA results showed that the thermal stability of E3074 serials was better than that of epoxy resin. The char residue of E3074 at 600 C increased with the incremental content of silicone. DMA tests displayed that the addition of silicone effectively enhanced the damping properties of epoxy resin.

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Effect of new hyperbranched polyester of varying generations on toughening of epoxy resin through interpenetrating polymer networks using urethane linkages

Cited by 74 publications

References 35 publications

Epoxy-functionalized star-shaped polymers as novel tougheners for epoxy resin

Epoxy-functionalized star-shaped polymers as novel tougheners for epoxy resin

Synthesis and characterization of a novel polyurethane curing agent modified by a diazafluorene derivative

The preparation and properties study of methoxy functionalized silicone‐modified epoxy resins

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