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Applied Polymer Composites

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Title: Investigations on the 3D laser cutting of CFRP using a nanosecond pulse fibre laser
Page Range: p.177-192
Author(s): Herzog D; Canisius M; Schmidt-Lehr M; Hergoss P; Daniel C; Sina Hallmann; Emmelmann C; Scherner M V
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Journal: Applied Polymer Composites
Issue Year: apc
Volume: 2
Issue No: No.4

Abstract
Laser cutting of carbon fibre reinforced plastics (CFRP) has proven to be a wear-free alternative especially for cutting thinner laminates up to 2-3 mm. Laser cutting of CFRP currently requires a trade-off between manufacturing speed and quality. This study deals with an intermediate laser cutting approach using a nanosecond short pulse laser with high average power to find a compromise between manufacturing speed and quality. Experiments have shown that the material removal rate is directly proportional to the average power for intensities above the ablation threshold. It is also demonstrated that for a certain average power the ablation rate stays constant, regardless of the combinations of pulse frequency and pulse energy. The process has been found to yield acceptable effective cutting speeds while at the same time the heat affected zone is in the range of less than 10 (mu)m for laminates of 1 mm thickness. After understanding the 2D process, it has been transferred to a CFRP bottle cage which was chosen as a reference 3D application. For this purpose, the effect of the angle of incidence on the cutting process has been investigated, to show what kind of curvatures can be tolerated within the processing plane and when a repositioning of the part is necessary. It has been demonstrated that the process itself is fully suitable for 3D cutting, and that a cost-efficient process can be achieved when not only the process but also interdependencies with the machine system, material and part design are taken into account. 21 Refs.

Title: Characterization of polydimethyl siloxane-colemanite composite pastes
Page Range: p.193-212
Author(s): Pinar Turan Beyli; Mehmet Dogan; Mahir Alkan
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Journal: Applied Polymer Composites
Issue Year: apc
Volume: 2
Issue No: No.4

Abstract
Composite pastes have been prepared with colemanite powders and linear, nonreactive polydimethyl siloxane. Solid:liquid ratio, particle size and temperature effects on the rheological properties of composite pastes have been studied using Rosand RH10 capillary rheometer. The resulting ceramic composites have been characterised by DTA/TG, Scanning Electron Microscope (SEM) and XRD. The paste exhibited a non-Newtonian and a pseudoplastic rheological behaviour. At a certain particle size distribution the shear viscosity of paste increased with increasing solid concentration. It was found that pastes behave as a shear thinning fluid in the temperature range of 30-75 deg C and was successfully described by the Power-law model. Power law index n was approx. 0.5 which means the paste is a non-Newtonian material. The consistency coefficient of pastes increased with increasing solid level and decreasing temperature. All solid colemanite particles were covered with polydimethyl siloxane and a homogenous composite material was obtained. 19 Refs.

Title: Poly(vinylpyrrolidone) coated multiwalled carbon nanotubes reinforced BisGMA nanocomposites
Page Range: p.213-228
Author(s): Praharaj A P; Dibakar Behera; Bastia T K; Arun Kumar Rout
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Journal: Applied Polymer Composites
Issue Year: apc
Volume: 2
Issue No: No.4

Abstract
Polyvinylpyrrolidone (PVP)-coated multiwalled carbon nanotubes (MWCNTs), prepared via solvent-casting method have been used for the fabrication of BisGMA (Bisphenol-A glycidyldimethacrylate) nanocomposites with PVP-coated MWCNT contents of 2, 5, 7, 10, 12 weight per cent. Fourier transform infrared spectroscopy indicates successful coating of PVP onto MWCNTs and scanning electron microscopy shows the dispersion of nanofillers in the matrix. 45% increase in tensile strength, 25% increase in Young's Modulus and improved thermal conductivity, dielectric strength and dielectric constant is observed for 10 wt% nanofiller loading. The volume conductivity and surface conductivities increased by 1.0 E-10 S/cm and 1.0 E-9 S for the same level of filler loading. The corrosive and water absorption properties of the composites are also reported. 18 Refs.

Title: Effect of water absorption on coconut fibre reinforced functionalized polyethylene composites developed by palsule process
Page Range: p.229-238
Author(s): Anshu Anjali Singh; Sanjay Palsule
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Journal: Applied Polymer Composites
Issue Year: apc
Volume: 2
Issue No: No.4

Abstract
10/90, 20/80 and 30/70 CNF/CF-HDPE - Coconut fibre (CNF) reinforced chemically functionalised high density polyethylene composites developed by Palsule process were immersed in distilled water at room temperature for 6600 hours. The amount of water absorbed by the CNF/CF-HDPE composites immersed in the water, increases with increasing amounts of the reinforcing coconut fibres in the composites. Tensile modulus and tensile strength of the water absorbed wet CNF/CF-HDPE composites are lower than those of the dry composites; but are higher than the dry and wet CF-HDPE matrix. 9 Refs.

Title: Effect of TiO2 as particulate reinforcement on mechanical properties of coir fibre reinforced epoxy composites
Page Range: p.239-244
Author(s): Sankalp Dixit; Savita Dixit
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Journal: Applied Polymer Composites
Issue Year: apc
Volume: 2
Issue No: No.4

Abstract
Effect of titanium dioxide (TiO2) as particulate reinforcement on some properties of coir fibre reinforced epoxy composite is investigated. This study reveals that incorporation of titania (TiO2) particulates as reinforcement results in enhancement of mechanical properties of coir-epoxy composites that decrease upon exposure of the composites to UV radiations. 1 Refs.

Title: beta silicon carbide coated MWCNTs reinforced polyetherimide nanocomposites
Page Range: p.245-252
Author(s): Nitin Nagar; Pandey K N; Pratibha Singh; Vishal Verma; Mishra R M
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Journal: Applied Polymer Composites
Issue Year: apc
Volume: 2
Issue No: No.4

Abstract
Polycarbosilane derived beta silicon carbide coated multi wall carbon nanotubes (MWCNTs) reinforced polyetherimide (PEI) nano-composites (with 0.1 to 0.3 phr coated MWCNTs reinforcements) have been fabricated by a sigma high temperature internal mixer followed by compression. Scanning electron microscopy (SEM) shows uniform and homogeneous dispersion of the coated MWCNTs in polyetherimide matrix, due to interfacial adhesion between the coated MWCNTs and the PEI matrix. Increasing mechanical properties of coated MWCNT/PEI nanocomposites with increasing amounts of coated MWCNTs in their compositions, confirm reinforcing effect of MWCNTs in PEI matrix in coated MWCNT/PEI nanocomposites. Thermo gravimetric analysis shows that the thermal stability of coated MWCNT/PEI nanocomposites is same as of PEI. 9 Refs.

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