Polar–polar interaction between the reinforcement and matrix for kevlar fiber‐reinforced composite: Effect of using the blend of polar polymers as matrix

Kodama, Minekazu; Karino, Isamu

doi:10.1002/app.1986.070320609

Cited by 17 publications

(10 citation statements)

References 8 publications

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“…The clearly defined increasing trend with φ w of the apparent activation energy must be related to increased hindering of the microbrownian motion of the PMMA chain segments originating the α relaxation. This hindrance may arise as a consequence of adsorption 26 of the PMMA molecules onto the microfibril mesh or as consequence of electrostatic interaction between the polar groups of the PMMA and PPTA molecules. , This kind of interfacial interaction has been observed also between the Kevlar filament and Nylon 6 in ref . Besides these local restrictions due to specific molecular interactions, the increased motional difficulties for the PMMA main chain segments could also have a nonlocal nature, due to steric confinement of some portions of the PMMA phase in the cavities of the PPTA network.…”

Section: Discussionmentioning

confidence: 89%

PMMA/PPTA Microcomposites

et al. 1997

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Polymer composites of several concentrations of poly(methyl methacrylate) and poly(pphenyleneterephthalamide) microfibrils have been prepared by blending a solution of the matrix polymer and a suspension of microfibrils obtained from a solution of commercial Kevlar fiber in H2SO4. Scanning electron microscopy shows that a continuous network of fibrils with dimensions in the range 30-70 nm builds up starting at very low PPTA concentrations and that these fibrils tend to form larger globular aggregates at higher PPTA concentrations. The high connectivity of the network is reflected in the good reinforcing effect as shown by the values of the dynamic-mechanical storage modulus. Increased interaction between the constituent phases as the fiber content grows is revealed by an increase of the calorimetric glass transition temperature and by thermogravimetric analysis, as well as by the growth of the slope of the Arrhenius plot of the main relaxation. The induced modifications of the matrix polymer's dynamic-mechanical spectrum are discussed with the help of predictions of a modified block model. A consistent interpretation of the temperature shifts of the glass transition and the main dynamic-mechanical dispersion can be gained on this basis. The numerical values of the model parameters that fit the experimental behavior correlate well with the buildup of structure revealed in the micrographs.

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Section: Discussionmentioning

confidence: 89%

PMMA/PPTA Microcomposites

et al. 1997

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“…These are more commonly used in fibers reinforcement plastics for engineering structures, Stress skin panels, and other high tensile strength applications. Kevlar and Technora are commercially important para-aramid fibers [28][29][30][31]. Table 7 gives a comparative account on different grades (kevlar 29, kevlar 49, and kevlar 149) of commercially important kevlar fibers and their innate mechanical properties.…”

Section: Meta-aramidsmentioning

confidence: 99%

Fiber Reinforced Composites - A Review

Prashanth¹,

Km²,

Nithin³

et al. 2017

J Material Sci Eng

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Fiber-reinforced composites are essentially axial particulates embedded in fitting matrices. The primary objective of fiber-reinforced composites it to obtain materials with high strength in conjunction with higher elastic modulus. The strength elevation is however affected with applied load transiting from matrix to fibers, interfacial bonding between fiber-matrix, their relative alignment and nature of fiber scheming the overall material behaviors. The alignment of fibers may however be continuous or random depending on the end applications. The choice of the fiber reinforcement and its fitting matrix also depends on application requirements. In recent years, the advent of composite technology has led to the development of different fiber reinforced composite systems via varying manufacturing methodologies to obtain advanced material behaviors. Herein, we present a comparative account on various kinds of synthetic fibers and their significance as potential reinforcements with special emphasis on carbon fibers.

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“…It is well known that aramid fibers present exceptional physical and technical characteristics, therefore, they are used extensively as reinforcing agents nowadays. Thus, many researchers studied the properties and performance of aramid fibers as reinforcement not only for thermo~etting,'-~ but also for thermoplastic matrices4- 12 The composites based on thermosetting materials reinforced with aramid fibers have of course some limitations due to the brittleness of the matrix. Moreover, the preparation of such composites is often characterized by slow production cycles.…”

Section: Introductionmentioning

confidence: 99%

Elastomeric polyurethanes reinforced with aramid fibers

Andreopoulos¹,

Konstantinidou²,

Petsalas³

1989

J of Applied Polymer Sci

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SynopsisThermoplastic polyurethane is a relatively new development in the elastomers field, combining elastomeric behavior with thermoplastic processing characteristics. Thus, high production rates and reduced scrap can be achieved but, increased versatility for the incorporation of additives is also possible. In this work, thermoplastic polyurethane matrices were prepared and Kevlar pulp w a s dispersed as a reinforcing agent. Since good dispersion and appropriate filler volume fraction are critical factors for a reinforcing effect, special attention was paid to the optimization of these parameters. Thermoplastic polyurethanes were prepared by mixing a low melting polyol with a low melting diisocyanate and the subsequent addition of small amounts of a chain extender, namely, a low molecular weight diol such as 1,4 butanediol. The Kevlar pulp was added under stimng either in the polyol or the diisocyanate melt. This incorporation technique allows the dispersion of small fiber percentages. Thus, calendering of the materials prepared was also performed and additional fibers were incorporated. Changes in the properties of the specimens prepared as a function of the filler volume fraction and the dispersion technique were determined, taking into consideration the possibilities of chemical interaction between fibers and matrix.

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Polar–polar interaction between the reinforcement and matrix for kevlar fiber‐reinforced composite: Effect of using the blend of polar polymers as matrix

Cited by 17 publications

References 8 publications

PMMA/PPTA Microcomposites

PMMA/PPTA Microcomposites

Fiber Reinforced Composites - A Review

Elastomeric polyurethanes reinforced with aramid fibers

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