Interfacial Shear Strengths of Carbon Fibers in Bisphenol-A Polycarbonate

Waterbury, Mark C.; Drzal, Lawrence T.

doi:10.1007/978-94-011-7816-7_69

Cited by 9 publications

(7 citation statements)

References 1 publication

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“…While van der Waals forces are established practically instantaneously after the intimate contact between the two phases is reached, the formation of local bonds is determined by the rates of two simultaneous opposite processes, namely, the establishment of local bonds and their fission [8,23]. This is indirectly confirmed by the fact that the bond strength in polymer-fiber and polymer-flat substrate depends on the temperature and time of the adhesive contact formation [18,24,25]. In this paper, we analyze possible physical mechanisms of the influence of electric charge on both adhesion components (van der Waals and local bonds) and propose corresponding models of these mechanisms.…”

Section: Introductionmentioning

confidence: 89%

“…The above analysis holds true for the interface with electric field present, with the difference that k 1 and k 2 from equations (28) and (29) should be substituted into equation (24), and equation (26) changes to…”

Section: S Zhandarov and E Mädermentioning

confidence: 98%

“…Here we consider 'temperature dependencies' as these are usually introduced by experimentalists [18,24], i.e. p ab (T ) functions at fixed time of adhesive contact formation, t. Explicit equations for these curves can be obtained by substituting the expressions for rate constants (equation (21)) into equation (24). Assuming…”

Section: Constant E I Valuesmentioning

confidence: 99%

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Increase in the molecular component of the adhesive pressure in polymer composites induced by electric charge

Zhandarov¹,

Mäder²

2006

Composite Interfaces

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The effect of electric charge, present at a glass fiber-polymer interface during the composite material formation, on the adhesive pressure between the components was studied. Additional electric charge was delivered to the interface by means of the deposition of charged polymer particles onto the fiber surface from a fluidized bed in an electric field. The adhesive pressure was calculated using the results of the variational mechanics analysis by Scheer and Nairn from the data obtained with a single fiber microbond test. Our experiments showed that the adhesive pressure increased by 15-20% in the case of charged polymer matrices. This can be attributed to both intensification of van der Waals forces due to extra interfacial pressure and, for polar polymers, the increase of the surface concentration of local adhesive bonds. The mechanical and kinetic models have been proposed to describe the observed behavior of the adhesive pressure; theoretical curves for the adhesive pressure as a function of the time and temperature of the contact formation, including the effect of electric factors, have been obtained. From the kinetic model, the activation energies for the process of adhesive contact formation were determined. The effect of acceleration of adhesive bonding in the presence of electric charge can be explained in terms of a decrease of the activation energy for local bond formation in an electric field.

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Section: Introductionmentioning

confidence: 89%

Section: S Zhandarov and E Mädermentioning

confidence: 98%

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Increase in the molecular component of the adhesive pressure in polymer composites induced by electric charge

Zhandarov¹,

Mäder²

2006

Composite Interfaces

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“…Most of these factors are basically determined by the microstructures of their compositions including crystallinity, spherulite size, transcrystallization at the interface and some other factors controlled by thermal histories during composites manufacturing . A great deal of studies have been performed to understand the influences of these parameters, but no apparent consensus was achieved on cooling rate and transcrystallization affecting interfacial shear strength (IFSS) or LTE for different thermoplastic composites. For example on the effect of cooling rate, Gao and Kim reported that decreasing cooling rate resulted in higher IFSS and LTE, while an increase in the IFSS was noted with increasing cooling rate for glass fiber/polypropylene (PP) and carbon fiber/polycarbonate (PC) systems .…”

Section: Introductionmentioning

confidence: 99%

“…A great deal of studies have been performed to understand the influences of these parameters, but no apparent consensus was achieved on cooling rate and transcrystallization affecting interfacial shear strength (IFSS) or LTE for different thermoplastic composites. For example on the effect of cooling rate, Gao and Kim reported that decreasing cooling rate resulted in higher IFSS and LTE, while an increase in the IFSS was noted with increasing cooling rate for glass fiber/polypropylene (PP) and carbon fiber/polycarbonate (PC) systems . For the effect of transcrystallization, it was argued that large thermal stresses might build up during the transcrystallization process, which in turn reduced the IFSS, whereas the increasing degree of crystallinity of matrix material effectively decreased the mismatch in moduli between the fiber and matrix, and thus enhancing the LTE across the interface .…”

Section: Introductionmentioning

confidence: 99%

Effects of thermal histories on carbon fiber/polyamide 6 microcomposite load transfer efficiency: Crystallization, modulus, and measurement

Zhang

Wang

et al. 2016

Polymer Composites

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In this work, load transfer efficiency (LTE) is quantitatively expressed as a specific formula and characterized through electrical resistance method. Single carbon fiber (CF) reinforced polyamide 6 (PA6) microcomposites with eight different thermal histories were prepared. Polarizing optical microscope (POM) was used to observe crystal morphologies. Tensile properties of neat PA6 with different thermal histories were tested. All the above results show that electrical resistance method is an effective way to characterize CF/PA6 microcomposite interface LTE. Water quenched CF/PA6 microcomposites have a highest LTE of 94.2%, while LTE decreased to 34.3% at the bottom for 2008C annealing treated specimens. POM results show that decreasing nonisothermal cooling rate results in larger spherulites and transcrystallites but lower nucleus density, while annealing treated samples nearly have no change and still keep quite transparent. It is also very interesting to find that there is an antisymmetric relationship between LTE and matrix modulus of nonisothermal/isothermal crystallization samples, and LTE drops more for the annealing treated specimens under the similar modulus, which ascribes to radial residual stress releasing during annealing treatment. POLYM. COMPOS., 39:102-109, 2018.

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Correlation among crystalline morphology of PEEK, interface bond strength, and in‐plane mechanical properties of carbon/PEEK composites

Gao

Kim

2002

J of Applied Polymer Sci

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ABSTRACT:The effect of the cooling rate on in-plane and interlaminar properties of carbon fiber/semicrystalline PEEK matrix composites was studied. Strengths and moduli were measured in tension, flexure, and interlaminar shear, all of which were shown to correlate, to different degrees, with the fiber-matrix interface adhesion and the bulk matrix properties. The in-plane and interlaminar properties, in general, increased with a decreasing cooling rate, which was attributed to changes in the failure mechanism from adhesive failure involving fiber-matrix interface debonding at high cooling rates to matrix-dominant cohesive failure at low cooling rates. The present study demonstrates that the mechanical properties of semicrystalline thermoplastic composites can be tailored for desired applications by controlling the processing conditions, especially the cooling rate.

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Interfacial Shear Strengths of Carbon Fibers in Bisphenol-A Polycarbonate

Cited by 9 publications

References 1 publication

Increase in the molecular component of the adhesive pressure in polymer composites induced by electric charge

Increase in the molecular component of the adhesive pressure in polymer composites induced by electric charge

Effects of thermal histories on carbon fiber/polyamide 6 microcomposite load transfer efficiency: Crystallization, modulus, and measurement

Correlation among crystalline morphology of PEEK, interface bond strength, and in‐plane mechanical properties of carbon/PEEK composites

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