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Start Over Topic materials science Journal advanced materials research Publisher trans tech publications
2 results

1. Surface characteristics and water absorption of sol-gel coated impregnated paper pressed onto plywood

Author

Juha Nikkola, Anne Christine Ritschkoff, Shaoxia Wang, Juha Mannila, Jouko Peltonen, Saila Jämsä, and Riitta Mahlberg

Subjects
Coated paper, Materials science, Absorption of water, impregnated paper, Atomic force microscopy, General Engineering, Silane, Surface energy, Contact angle, chemistry.chemical_compound, sol-gel hybrid coatings, chemistry, X-ray photoelectron spectroscopy, water absorption, XPS, plywood, Composite material, AFM, Sol-gel
Abstract

Two silane-based hybrid coatings were developed to modify the surface energy of phenolic resin impregnated paper. The coated paper samples were further pressed onto surfaces of plywood. The surface properties and water repellence of coated paper were investigated by AFM, XPS and water contact angle measurements. The water absorption of plywood with pressed paper was studied by water uptake tests. It was found that the sol-gel coatings had slightly improved the water repellence of the impregnated paper. The water absorption of plywood was also slightly decreased.

Published
2011

2. Evaluation and Characterization of Plastics-Made Sheet Type Components under Impact

Author

M. Nizar Machmud, Kikuo Kishimoto, Hirotsugu Inoue, and Masaki Omiya

Subjects
Core (optical fiber), Brittleness, Materials science, Scanning electron microscope, visual_art, General Engineering, Perpendicular, Fracture (geology), visual_art.visual_art_medium, Composite material, Polycarbonate, Layer (electronics), Finite element method
Abstract

Experimental works using a drop weight impact test method have been performed on a circular sheet specimen to evaluate and to characterize the impact resistance of the sheet-type plastic components designed for automotive wheel covers. Evaluation has been conducted for a set of engineering plastics: polycarbonate (PC), acrylonitrile-butadiene-styrene (ABS) and their blend (PC/ABS). The testing results showed that the PC/ABS blend specimens failed in brittle manner under higher impact speeds with very few of whitening zones. Secondary cracks captured perpendicular to fracture surface were also found in the mid-plane of the scattered PC/ABS blend specimens. Investigation is then focused on this blend and the testing results describe that impact resistance of the specimen made of this alternative material is determined by ABS not by PC. Combination of structures between PC and ABS through the thickness in the core due to their immiscibility was observed by scanning electron microscope (SEM) on the etched PC/ABS specimen. This latter result well correlates the results obtained from the testing. It therefore reveals that immiscibility between PC and ABS in the blend plays an important role in determining the impact resistance of the components. This paper also presents simulative results of the test obtained from a FEA work by introducing a 3D- layered finite element (FE) model of the PC/ABS specimen to take into account effect of a layer in the core on the behavior of the blend.

Published
2008