نتایج جستجو برای: alal2o3 composites

تعداد نتایج: 45835  

Journal: :Bioresource technology 2008
John Z Lu Xinfang Duan Qinglin Wu Kun Lian

Wood-polymer composites (WPC) have been extensively used for building products, outdoor decking, automotive, packaging materials, and other applications. WPC is subject to fungal and termite attacks due to wood components enveloped in the thermoplastic matrix. Much effort has been made to improve decay resistance of WPC using zinc borate and other chemicals. In this study, chitosan copper compl...

2015
Krishnan A. Iyer John M. Torkelson

Biocomposites of low-density polyethylene (LDPE) and polypropylene (PP) with 5–40wt% soy flour (SF) are produced by two-step single-screw extrusion (SSE) followed by solid-state shear pulverization (SSSP). The SSE-SSSP approach overcomes limitations with melt mixing, e.g poor SF dispersion and degradation, and limitations with single-step SSSP. Microscopy shows that SF is well dispersed in SSE-...

2015
Chern Chiet Eng Nor Azowa Ibrahim Norhazlin Zainuddin Hidayah Ariffin Wan Md Zin Wan Yunus

Effects of modifying oil palm mesocarp fibers (OPMF) by methacrylate silane on polylactic acid (PLA)/ polycaprolactone (PCL)/clay/OPMF hybrid composites were investigated. The composites were prepared by a melt blending technique and characterized by dynamic mechanical analysis (DMA) and scanning electron microscopy (SEM). The silane-treated OPMF hybrid composites showed better tensile strength...

Journal: :avicenna journal of dental research 0
sohrab asefi department of orthodontic, shahid beheshti university of medical sciences, tehran, ir iran; department of orthodontic, shahid beheshti university of medical sciences, tehran, ir iran. tel: +98-2177794887, fax: +98-219124265985سازمان اصلی تایید شده: دانشگاه علوم پزشکی شهید بهشتی (shahid beheshti university of medical sciences) solmaz eskandarion dental material department, dentistry school, shahid beheshti university of medical sciences, tehran, ir iranسازمان اصلی تایید شده: دانشگاه علوم پزشکی شهید بهشتی (shahid beheshti university of medical sciences) farhad shafiei dental material department, dental school, tehran university of medical sciences, tehran, ir iranسازمان اصلی تایید شده: دانشگاه علوم پزشکی تهران (tehran university of medical sciences) mohammad javad kharazifard deputy of research, school of dentistry, tehran university of medical sciences, tehran, ir iranسازمان اصلی تایید شده: دانشگاه علوم پزشکی تهران (tehran university of medical sciences)

conclusions estelite sigma quick composite had wear resistance similar to that of nano- and microfilled composites. estelite flowable composites demonstrated similar wear resistance to that of a posterior composite. results the wear amounts of the composites are as follows in order: estelite sigma quick (1886.9 ± 518.5 μm2), estelite flow quick (2708.9 ± 578.1 μm2), estelite high flow (3206 ± 2...

Journal: :علوم و تکنولوژی پلیمر 0
هدایت اله صادقی قاری اعظم جلالی آرانی زهرا شکوری

the transport properties of liquids and gases through polymeric materialsplay a very important role in some areas of industrial applications. in thisstudy, natural rubber (nr)/caco3 composites were prepared by melt mixingmethod. by equilibrium swelling test, the transport process of toluene in the prepared natural rubber composites was investigated. the diffusion and transport of toluene throug...

1996
S. TORQUATO

-For isotropic two-phase composites, we derive phase-interchange inequalities for the bulk and shear moduli in two and three space dimensions. We find optimal microstructures that realize part of the bulb: and shear moduli bounds in two dimensions. Geometrical-parameter bounds and the translation method are used to prove the results. The phase-interchange relations are applied to composites wit...

Journal: :Dental materials journal 1985
M Nakamura K Imai H Oshima T Kudo S Yoshioka H Kawahara

The in vitro cytctoxicity to HeLa S3 cells of set specimens of five commercially available light-cured composites was examined by the cell colony-forming method for 6 weeks. Both visible and ultraviolet light-cured composites showed moderate to strong cytotoxicity in the early stage of the experiment, followed by rapid disappearance of cytotoxicity. The light-cured composites showed in vitro bi...

2016
R Shanmugavel M Jayamani R Nagarajan S Irullappasamy F Cardona M T H Sultan

In this work, the redmud reinforced polypropylene composites were fabricated by compression molding setup. The effects of the redmud content on the mechanical, melting and crystalline behavior of the composites was investigated. The melting and crystalline behavior of the composites were investigated using Digital Scanning Calorimeter. The test results show that hardness of the composites incre...

Journal: :international journal of advanced design and manufacturing technology 0
s. mohammad reza khalili k.n. toosi university of technology south tehran branch, islamic azad university r. eslami farsani k.n. toosi university of technology v. daghigh islamic azad university

changes in moisture content and temperature can perturb both stiffness and strength and as such the impact resistance of composite structures. in this paper, the pre-notched basalt fibre reinforced epoxy (bfre) composite specimens are studied under charpy impact loads in order to investigate the changes in impact energy absorption (fracture toughness) with different kinds of aging conditions. t...

In this research, the influence of adding micro- and nano- sized calcium carbonate powders to nylon-66 was investigated. Mechanical properties of micro and nano- composites, including tensile strength, elongation, and Young’s modulus, before and after ageing, were determined and analyzed. For this purpose, micro- and nano-sized CaCO3 particles were used as fillers to prepare micro-composites (c...

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