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Joni I.M.,Hiroshima University | Joni I.M.,Padjadjaran University | Nishiwaki T.,Hiroshima University | Okuyama K.,Hiroshima University | And 2 more authors.
Powder Technology | Year: 2010

The use of aluminum trihydroxide (ATH) fillers as non-halogen flame retardants for polymethylmethacrylates (PMMA) creates a conflict between the mechanical properties and heat resistance of the composites. Therefore, to ensure that the PMMA mechanical properties remain satisfactory, improvements in both the filler-polymer interactions and the ability to control the size and size distribution, morphology and dispersion of the fillers are required. Thus, in the present study, bead milling was used to control both the size distribution and dispersion of ATH fillers in MMA, which had an initial average size of 0.75 μm. The dispersion was obtained by alteration of the surface characteristics of ATH fillers using a silane-based dispersing agent, (3-acryloxypropyl) trimethoxysilane (APTMS). Bead milling successfully comminuted the ATH particles and prevented the formation of ATH agglomerates. The smallest average size of the ATH particles after bead milling was 300. nm. Highly dispersed ATH filler particles were observed in the TEM images of the PMMA/ATH composites. The filler-polymer interaction, i.e. the interaction parameter (B), was calculated. The effects of volume fraction, particle size distribution, and surface modification of the fillers on the results of dynamic mechanical analysis (DMA) are discussed. The thermal stability of the PMMA/ATH composites was also investigated using thermal gravimetric analysis (TGA). © 2010 Elsevier B.V.

Yasuda H.,Ritsumeikan UniversityShiga | Sakaue Y.,Ritsumeikan UniversityShiga | Tanaka M.,Osaka Dental University | Matsushima M.,Kurary CO. | And 4 more authors.
Transactions of Japanese Society for Medical and Biological Engineering | Year: 2014

Chewing is thought to be important for normal swallowing, because it fixes the human mandible on proper place. When fulcrum of tongue movement vanishes, it becomes difficult to roll food bolus and saliva into pharynx by tongue. The purpose of this study is to develop a new swallowing measurement system focused on the movement of prominentia laryngea and mandible to estimate the swallowing mechanism. In our measurement system, a flexible polymer curvature sensor (FPCS), that converts its bending curvature into voltage, was used to measure the movement of prominentia laryngea and mandible during swallowing. FPCSs were attached on prominentia laryngea and bulging of masseter in the vicinity of mandible. The waveforms of FPCSs changed according to swallowing. Results suggest that the swallowing test focusing on movement of prominentia laryngea and mandible is possible. © 2014, Japan Soc. of Med. Electronics and Biol. Engineering. All rights reserved.

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