A novel preparation of polyimide/clay hybrid films with low coefficient of thermal expansion

Gu, Aiqin; Chang, Feng‐Chih

doi:10.1002/1097-4628(20010110)79:2<289::aid-app100>3.0.co;2-v

Cited by 59 publications

(5 citation statements)

References 24 publications

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“…46 The thermal stresses caused by these gradients can be very favorable for the fiber/matrix debonding or/and the crack initiation. 47 Increasing the susceptibility of fiber/ matrix interface to aggressive reactions and formation of microcracks in the matrix resulting from the degassing of water vapor and organic volatiles are considered as other consequences of the thermo-oxidation, having the adverse effect on the strength properties of PMCs even below the glass transition temperature, Tg. 48,49 Thus, the best explanation for the decline of surface properties such as flexural strength in GE composites can be attributed to surface degradation due to the thermal stresses-induced microcracks and/or the chemical degradation of the matrix by additional cross-linking or chain scission during the thermo-oxidative process.…”

Section: Resultsmentioning

confidence: 99%

Influence of thermal aging on mechanical properties of fiber metal laminates hybridized with nanoclay

Najafi

Ansari

Darvizeh

2019

Proceedings of the Institution of Mechanical Engineers, Part C:

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One of the main problems of polymer matrix composites in critical applications is their high sensitivity to thermal conditions. Therefore, an experimental study was performed to evaluate the thermal durability of traditional plain weave E-glass/epoxy as well as fiber metal laminates as a possible alternative in this case. In this way, both the laminate types were exposed to thermal aging at 130 ℃ for five weeks, and the plausible degradation is investigated through weight loss analyzes and mechanical testing. The possibility of improving the mechanical behavior of the studied laminates by nanoclay was also studied. The results demonstrated that the weight loss and mechanical degradation were more pronounced in thermally aged plain weave E-glass/epoxy composites. The results also indicated that nanoclay could enhance the mechanical properties of both laminates. On the basis of the results, the shielding role of aluminum layers and thermal resistance of nanoclay can synergistically offer a novel class of nano-fiber metal laminates with high thermal tolerance in thermo-oxidative conditions.

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Section: Resultsmentioning

confidence: 99%

Influence of thermal aging on mechanical properties of fiber metal laminates hybridized with nanoclay

Najafi

Ansari

Darvizeh

2019

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…N ANOCOMPOSITES ARE A particular class of composite materials where the dispersed phase has dimensions in the range of 1-100 nm [1]. Many studies have indicated that the mechanical, thermal, and other properties of a polymer matrix, such as dimensional stability, may be significantly improved by the incorporation of nanoparticles [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. Many inorganic particles have been employed to improve the mechanical performances of polymers for engineering applications [4] and previous investigations have shown that SiO 2 nanoparticles may produce a positive effect on the properties of nanocomposites [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

“…The effect of processing parameters, such as mixing temperature and speed of stirring on the level of intercalation and exfoliation of clay in clay/epoxy nanocomposites, have been recently studied and compared to a high pressure process, using a suspension of clay in acetone [26]. Thus, processing techniques able to produce complete particle dispersion in polymer matrix nanocomposites are still a technical challenge and, thus, they are of great interest [2][3][4]6,7,13,21].…”

Section: Introductionmentioning

confidence: 99%

High Energy Mill Processing of Polymer Based Nanocomposites

Melo

Almeida

Paskocimas

et al. 2008

Journal of Composite Materials

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Polymer matrix nanocomposites have attracted growing attention due to the potential for significantly improving the properties of the polymer by adding a very small amount of nanoparticles. However, the improvement in properties has been related to the degree of dispersion of the nanoparticles in the polymer matrix and, due to their enormous specific surface area, nanoparticles tend to agglomerate. Thus, processing techniques able to produce complete particle dispersion in polymer matrix are of great interest. The purpose of this work is to present a new processing technique for polymer matrix nanocomposites using a high energy mill as an effective approach to disperse ceramic nanoparticles in a polymer matrix. SiO2/epoxy nanocomposites were processed with various SiO2 contents using the proposed approach. Transmission electron microscopy (TEM) micrographs of the nanocomposites processed indicated good particle dispersion. In addition, agglomerates were not observed on the scanning electron microscopy (SEM) fractographs of the nanocomposites, up to 3wt% SiO2. The processed nanocomposites were also characterized by dynamic mechanical analysis (DMA) to investigate the effect of nanoparticles content on the viscoelastic properties and on the glass transition temperature. In summary, the technique was found promising in achieving good levels of particle dispersion in a thermoset polymer matrix.

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“…Recently polymer/layered silicate nanocomposites have received significant attention, due to their remarkably superior mechanical, thermal, optical, and physicochemical properties, by comparison with pure polymer or conventional composites (micro and macrocomposites). The enhanced mechanical properties of nanocomposites include stiffness and hardness, increased modulus, superior heat distortion temperature (HDT), gas barrier properties, superior flame retardant proporties, and dimensional stability [2][3][4][5][6][7]. Nanocomposite materials have been used commercially in a number of applications [8,9].…”

Section: Introductionmentioning

confidence: 99%

Effect of Molding Condition on Mechanical Properties of Injection Molded Nylon 6-Clay Nanocomposites

Chen

Hsu

2008

Journal of Reinforced Plastics and Composites

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In this study, the effects of varying molding conditions, including melt temperature, mold temperature, and injection speed, on the mechanical properties of injection molded nylon-6/fluoromica nanocomposite (Unitika) were investigated. A DSC test and SEM were used to examine the microstructure of material and verify the experimental results. Results showed that the addition of 5 wt% nano-fluoromica particles to pure nylon-6 increases the tensile strength over 20% and the flexural strength more than 38%, but decreases impact strength by less than 2%. Results also indicate that the tensile strength and flexural strength of the nylon-6/fluoromica nanocomposite increase with increased melt temperature, mold temperature, and injection speed. However, the impact strength of nylon-6/fluoromica nanocomposite increased with increased melt temperature, but decreased with increasing mold temperature and injection speed. The DSC measurement revealed that the crystallinity of nylon-6/fluoromica nanocomposite increases with all molding parameters. The SEM results also indicate that the nylon-6/fluoromica nanocomposite is more brittle than the pure nylon-6.

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A novel preparation of polyimide/clay hybrid films with low coefficient of thermal expansion

Cited by 59 publications

References 24 publications

Influence of thermal aging on mechanical properties of fiber metal laminates hybridized with nanoclay

Influence of thermal aging on mechanical properties of fiber metal laminates hybridized with nanoclay

High Energy Mill Processing of Polymer Based Nanocomposites

Effect of Molding Condition on Mechanical Properties of Injection Molded Nylon 6-Clay Nanocomposites

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