Study of the influence of thermal history on the load transfer efficiency and fibre failure in carbon/polypropylene microcomposites using Raman spectroscopy

Nielsen, A. S.; Pyrz, Ryszard

doi:10.1163/156855499x00152

Cited by 19 publications

(12 citation statements)

References 23 publications

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“…In this paper, LTE is defined as ratio of fiber strain in the microcomposite and strain applied on the microcomposite, which is quantitatively expressed as a specific formula ( Eq . ) and different from the previously reported statements that mostly evaluated by interfacial shear strength or interfacial adhesion strength in a qualitative way. This definition and the corresponding investigations are more representative of practical composite applications that fibers bear stress continuously rather than continually.…”

Section: Methodscontrasting

confidence: 98%

“…However, it was believed by others that the transcrystalline interface relieved the thermal residual stresses due to preferred orientation of the crystallites with respect to the fiber. Nielsen also deemed that for semicrystalline polymers like PP and PEEK, the transcrystallization occurs as a result of heterogeneous nucleation on the fiber surface may affect the interfacial friction parameter or may even result in a more effective stress transfer mechanism. These disputes probably result from the differences of fiber/polymer systems and processing conditions and warrant a systematic study to clarify the relationship between thermal histories and LTE of fiber reinforced PA6.…”

Section: Introductionmentioning

confidence: 99%

“…As for measurement, unfortunately, there is not a clear and specific definition and test method for LTE yet. People usually characterized it by IFSS indirectly and qualitatively like fiber fragmentation , fiber pull‐out and micro‐debonding methods. But it cannot represent practical composite applications because fiber is usually break into numerous sections or the interphase is wholly debonded during IFSS test.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Methodscontrasting

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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“…Ye et al [8] reported that for the carbon fibre/PPS and carbon fibre/PET systems slower cooling resulted in a higher interfacial strength. Similar results to Ye et al were reported by Nielsen and Pyrz [9] for carbon fibre/iPP. Nielsen and Pyrz studied the effect of four different cooling rates (1, 2.5, 25, and 130°C/min) through Raman monitored fibre fragmentation, and showed that the slower the cooling the better was the interfacial strength.…”

Section: Introductionsupporting

confidence: 92%

An Investigation of the Effect of Processing Conditions on the Interface of Flax/Polypropylene Composites

Zafeiropoulos

Baillie

Matthews

2001

Advanced Composites Letters

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In recent years there has been an increasing interest in using natural fibres as potential reinforcements for polymers. It is well known that the properties of composite materials are controlled by the properties of the matrix and the fibre, as well as of the interface. The most usual methods of strengthening the interface involve the application of surface modification methods on the fibres, or the application of compatibilisers in the matrix. However, it may be possible that one may achieve similar results just by simply controlling the processing conditions, and thus avoiding the application of chemicals that tend to increase the cost. In the present study the effect of cooling rates upon the interface in flax fibre/iPP composites was investigated by means of fragmentation tests. It was found that slower cooling leads to a stronger interface for two different grades of flax fibres; dew retted and green flax.

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“…It can induce outstanding properties when adequately dispersed in polymeric matrix, such as rigidity increases without important losses in ductility, enhancement in electrical conductivity, nucleate crystallinity and thermal properties [8][9][10][11][12][13][14]. Unfortunately, carbon nanotubes have a trend of spontaneous aggregation because of their large surface area and high surface energy, which further limits their use [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Effect of multiwalled carbon nanotubes on the crystallization and dielectric properties of BP-PEN nanocomposites

Zheng

Yang

et al. 2014

J Mater Sci: Mater Electron

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In this work, polymer-based nanocomposite films formed from biphenol poly(arylene ether nitrile) (BP-PEN) and multiwalled carbon nanotubes (MWCNTs) were successfully prepared by the solution casting method combined with continuous ultrasonic dispersion technology. The micromorphology, thermal, mechanical and dielectric properties of the nanocomposite films were investigated in detail. Non-isothermal crystallization behavior studies indicate that the presence of MWCNTs enhances the crystallization of BP-PEN in the nanocomposites, which is consistent with the XRD analysis. Most importantly, it could be observed that the film containing 0.8 wt% MWCNTs reached the maximum crystallinity. Although, incorporation of MWCNTs did not obviously increase the mechanical of the films, all the nanocomposite films still exhibited excellent mechanical strength. The SEM micrographs of the nanocomposite films showed that the MWCNTs were uniformly coated by BP-PEN crystals, and indicating significantly improved nucleation ability of MWCNTs for polymer crystallization.

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Study of the influence of thermal history on the load transfer efficiency and fibre failure in carbon/polypropylene microcomposites using Raman spectroscopy

Cited by 19 publications

References 23 publications

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

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

An Investigation of the Effect of Processing Conditions on the Interface of Flax/Polypropylene Composites

Effect of multiwalled carbon nanotubes on the crystallization and dielectric properties of BP-PEN nanocomposites

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