Miscibilization of low molecular weight functionalized polyethylenes in epoxy resins: Part 2. Effects of curing on morphological features and mechanical properties

Frigione, Mariaenrica; Acierno, Domenico; Mascia, L.

doi:10.1002/(sici)1098-2329(199923)18:3<237::aid-adv4>3.0.co;2-u

Cited by 7 publications

(5 citation statements)

References 41 publications

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“…Approaches to enhance the adhesive and mechanical strength of the final products have included the addition of particulate fillers, [1][2][3] reactive liquid rubbers, [4][5][6][7][8][9][10] and thermoplastic polymers. [11][12][13][14][15] Epoxy resin's properties have also been improved by using nanoparticles [16][17][18][19][20] as well as other cross-linkable polymers to form full-or semi-interpenetrating polymer networks. [21][22][23][24][25][26][27][28][29] Yilmazer and co-workers 16 have used unmodified montmorillonite (Cloisite Na + ) and organically modified Cloisite 30B as reinforcing agents for diglycidyl ether of bisphenol-A (DGEBA), Their results have shown an increase in the glass transition temperature (Tg) by more than 10°C with the addition of 9 wt% of a modified montmorillonite (MMT).…”

Section: Introductionmentioning

confidence: 99%

“…In the past few decades, a considerable amount of work has been devoted to improve the mechanical and thermal properties of epoxy resins. Approaches to enhance the adhesive and mechanical strength of the final products have included the addition of particulate fillers,1–3 reactive liquid rubbers,4–10 and thermoplastic polymers 11–15. Epoxy resin's properties have also been improved by using nanoparticles16–20 as well as other cross‐linkable polymers to form full‐ or semi‐interpenetrating polymer networks 21–29…”

Section: Introductionmentioning

confidence: 99%

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Preparation and property evaluation of nanocomposites based on polyurethane‐modified epoxy/montmorillonite systems

Bakar¹,

Kostrzewa²,

Hausnerová³

et al. 2010

Adv Polym Technol

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Montmorillonite nanoclay and polyurethanes obtained from polyethylene glycol (PUR 400) and polyoxypropylene diol (PUR 1002) were used to enhance the mechanical properties of an epoxy resin. Maximum impact strength improvement was obtained with compositions containing 2% nanoclay and 10% PUR 400 as well as that with 1% nanoclay and 15% PUR 400, corresponding to 110% and 75%, respectively, in relation to the unmodified epoxy resin. Moreover, a 10-fold increase was observed with respect to the flexural strain at break for the composition containing 15% PUR 1002 and 2% nanoclay.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Preparation and property evaluation of nanocomposites based on polyurethane‐modified epoxy/montmorillonite systems

Bakar¹,

Kostrzewa²,

Hausnerová³

et al. 2010

Adv Polym Technol

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“…For the sample containing 2.5% PANI-DBSA, the existence of the conductive salt is not visible at first (Figure 3a), and the surface strongly resembles that of a typical EP fracture surface. [19][20][21] With a closer look, a few regions (indicated by arrows) of a different structure are detected. These regions may correspond to higher local concentrations of PANI-DBSA.…”

Section: Resultsmentioning

confidence: 99%

Morphological Studies of Epoxy/Polyaniline Blends

Tsotra

Gryshchuk

Friedrich

2005

Macro Chemistry & Physics

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Summary: Polyaniline‐dodecybenzenesulfonic acid (PANI‐DBSA)/epoxy resin (EP) blends were prepared by a solution‐in‐toluene process and direct mixing of PANI‐DBSA with EP. The dispersion quality of PANI‐DBSA proved to be strongly related to the final electrical properties of the cured blends. The solution processed blends showed enhanced electrical properties with small PANI‐DBSA contents (percolation threshold determined was around 2.3 wt.‐% PANI‐DBSA). The morphologies of these blends were investigated by atomic force (AFM), scanning electron (SEM) and transmission electron (TEM) microscopy. The existence of a translucent PANI‐DBSA network exists within the EP matrix. The microscopy investigations were in agreement with the results from differential scanning calorimetry (DSC) and dynamic mechanical thermal analysis (DMTA).SEM image of the PANI‐DBSA‐rich regions (indicated by arrows) surrounded by the conductive EP/PANI‐DBSA matrix (5 wt.‐% PANI‐DBSA).magnified imageSEM image of the PANI‐DBSA‐rich regions (indicated by arrows) surrounded by the conductive EP/PANI‐DBSA matrix (5 wt.‐% PANI‐DBSA).

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“…In the past few decades, a considerable amount of work has been devoted to improving the fracture toughness and mechanical properties of EP; these include the incorporation of particulate fillers, reactive liquid rubbers, and thermoplastic polymers into the epoxy matrix . Some of the toughening approaches, such as the addition of rubber, have led to the deterioration of the mechanical and thermal properties of EP.…”

Section: Introductionmentioning

confidence: 99%

Preparation and properties of polyurethane‐modified epoxy cured in different simulated gravity environments

Wang

Liu

et al. 2015

J of Applied Polymer Sci

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Great attention has been paid to the composites with interpenetrating polymer networks (IPNs) because of their special performance. However, the influence of sedimentation and convection from different gravity environments on the formation of IPNs and the properties of IPNs blends has received little attention. To understand their influence, environments with different gravity accelerations of 0g, 1g, and 2g were simulated with a superconducting magnet, and tests, including differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA), coefficient of thermal expansion (CTE), scanning electron microscopy, and three-point bending, of the IPNs blends cured in different gravity environments were conducted and analyzed. Fourier transform infrared spectroscopy, DSC, and DMA proved the formation of IPNs during the reaction between the polyurethane prepolymer (PUP) and epoxy resin (E51). The curves of DSC also certified the differences in the curing degree between the different parts along the direction of gravity of a sample. With the increase of mass fraction of PUP, the change trends of the storage modulus presented a linear decrease when samples cured in microgravity environment, but presented a parabolic trend when samples were cured in terrestrial environment. The damping properties of samples cured in simulated microgravity environments are better than those cured in terrestrial environment. With the increase in the simulated acceleration of gravity, the diameter of dispersed phase in a sea-island structure increased, but their number decreased and the bending stress and CTE of the IPN blends all decreased. These results show the formation of IPNs was affected by different gravity values, and the thermal and mechanical properties of the IPN composites were influenced by the changed IPN components.

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Miscibilization of low molecular weight functionalized polyethylenes in epoxy resins: Part 2. Effects of curing on morphological features and mechanical properties

Cited by 7 publications

References 41 publications

Preparation and property evaluation of nanocomposites based on polyurethane‐modified epoxy/montmorillonite systems

Preparation and property evaluation of nanocomposites based on polyurethane‐modified epoxy/montmorillonite systems

Morphological Studies of Epoxy/Polyaniline Blends

Preparation and properties of polyurethane‐modified epoxy cured in different simulated gravity environments

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