scholarly journals Magnetorheological Response for Magnetic Elastomers Containing Carbonyl Iron Particles Coated with Poly(methyl methacrylate)

Polymers ◽  
2021 ◽  
Vol 13 (3) ◽  
pp. 335
Author(s):  
Daichi Takahashi ◽  
Annadanam Venkata Sesha Sainath ◽  
Junko Ikeda ◽  
Kulisara Budpud ◽  
Tatsuo Kaneko ◽  
...  
Keyword(s):  
Methyl Methacrylate ◽  
Carbonyl Iron ◽  
Density Measurement ◽  
Number Density ◽  
Iron Particles ◽  
Sem Images ◽  
Pmma Layer ◽  
Poly Methyl Methacrylate ◽  
Fourier Transformed Infrared Spectroscopy ◽  
Magnetic Elastomers

The magnetorheological response for magnetic elastomers containing carbonyl iron (CI) particles with a diameter of 6.7 μm coated with poly(methyl methacrylate) (PMMA) was investigated to estimate the diameter of secondary particles from the amplitude of magnetorheological response. Fourier-transformed infrared spectroscopy revealed that the CI particles were coated with PMMA, and the thickness of the PMMA layer was determined to be 71 nm by density measurement. The change in the storage modulus for magnetic elastomers decreased by coating and it was scaled by the number density of CI particles as ΔG~N2.8. The diameter of secondary particle of CI particles coated with PMMA was calculated to be 8.4 μm. SEM images revealed that the CI particles coated with PMMA aggregated in the polyurethane matrix.

Poly(methyl methacrylate)-coated carbonyl iron particles and their magnetorheological characteristics

2010 ◽  
Vol 59 (7) ◽  
pp. 879-883 ◽  
Author(s):  
Wanquan Jiang ◽  
Hong Zhu ◽  
Chaoyang Guo ◽  
Jianfeng Li ◽  
Qun Xue ◽  
...  
Keyword(s):  
Methyl Methacrylate ◽  
Carbonyl Iron ◽  
Iron Particles ◽  
Poly Methyl Methacrylate

scholarly journals Mechanical Improvement of Multi-Walled Carbon Nanotube/Poly (Methyl Methacrylate) Composites

2005 ◽  
Vol 297-300 ◽  
pp. 2545-2550 ◽  
Author(s):  
Hyun Chul Kim ◽  
Sang Eui Lee ◽  
Chun Gon Kim ◽  
Jung Ju Lee
Keyword(s):  
Carbon Nanotube ◽  
Methyl Methacrylate ◽  
Fiber Composites ◽  
Short Fiber ◽  
Reinforced Composites ◽  
Short Fibers ◽  
Sem Images ◽  
Poly Methyl Methacrylate ◽  
Multi Walled Carbon Nanotube ◽  
Loading Tests

Multi-walled carbon nanotube (MWNT)/poly (methyl methacrylate) composites were fabricated with the variation of the concentration rate of nanotubes by the solution casting. SEM images showed that the nanotubes were dispersed well throughout PMMA. Assuming that MWNTs in MWNT/PMMA composites were randomly oriented, the Tsai-Pagano equation, which can give the moduli of short fiber reinforced composites, was used to evaluate that of the MWNT/PMMA composite. For investigating mechanical properties of the MWNT/PMMA composite, tensile loading tests were performed, varying the concentration rate of the MWNTs. For each concentration rate of the MWNTs, at least 5 specimens of MWNT/PMMA composites were made and tested. As the concentration rate of the MWNTs increased from 0 to 0.15wt%, tensile strength and modulus of the MWNT/PMMA composites were improved by about 20% and 32%, respectively. However, the experimental results were not in agreement with what we estimated. Here are two reasons supposed. First, the MWNTs used in this research were not stretched straightly but entangled. It means that MWNTs cannot be assumed to be short fibers. Second, the concentration rate of the MWNTs is too small to be considered as short fiber composites.

Synthesis of Poly(Methyl Methacrylate) Reinforced by Graphene Nanoplates

2021 ◽  
Vol 897 ◽  
pp. 63-70
Author(s):  
Elif Kocacinar ◽  
Nilgun Baydogan
Keyword(s):  
Mechanical Properties ◽  
Methyl Methacrylate ◽  
In Situ Polymerization ◽  
Technical Problem ◽  
Test Method ◽  
X Ray Diffraction ◽  
Sem Images ◽  
Poly Methyl Methacrylate ◽  
Superior Mechanical Properties ◽  
Dispersion Problem

Graphene nanoplatelets (GNPs) was used as a nanofiller in Poly(methyl methacrylate) (PMMA) synthesized by the Atom Transfer Radical Polymerization (ATRP) method. The first step in the synthesis of the PMMA/GNPs was the dispersion of GNPs in the PMMA liquid monomers by combining the solutions so that GNPs had superior mechanical properties, thermal stability, and electrical conductivity also lower density of mass. Then the crosslinked PMMA/GNPs nanocomposite samples were synthesized by using the in-situ polymerization method. However, there was a challenging technical problem in the application of GNPs (at a large amount) in the polymer. For the purpose of benefiting from the advantageous properties of GNPs (especially in bulk quantities) at PMMA, the major problem at the synthesis of PMMA/GNPs nanocomposite was the GNPs dispersion in the polymer matrix. This research has focused on solving that dispersion problem with the aim of enhancing the mechanical properties of the nanocomposite by utilizing the ATRP method as the effective production technic. The structural characterization of PMMA/GNPs nanocomposite was performed for the examination of the integration of GNPs in PMMA. The surface morphology of the nanocomposite was analyzed using SEM images. X-Ray Diffraction (XRD) as a non-destructive test method was used to examine the changes in the crystalline properties of the nanocomposite structure with the rise of the GNPs amount in PMMA. The bonding interactions with each other were investigated by using Raman analysis.

Density Measurements of Annealed Amorphous Polymers

1995 ◽  
Vol 60 (11) ◽  
pp. 1935-1940 ◽  
Author(s):  
František Lednický
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Methyl Methacrylate ◽  
Density Measurement ◽  
Amorphous Polymers ◽  
Sufficient Accuracy ◽  
Density Measurements ◽  
Poly Methyl Methacrylate ◽  
Flotation Method

The flotation method of the density measurement was adapted to reach sufficient accuracy with which the differences due to annealing amorphous polymers above their glass transition temperature can be traced. The densities of amorphous poly(methyl methacrylate) and polystyrene increase logarithmically in the course of the annealing, which suggests that some arrangement or ordering takes place. However, the changes are not stable.

Properties and Characterization of Chitosan/Collagen/PMMA Composites Containing Hydroxyapatite

2016 ◽  
Vol 672 ◽  
pp. 247-256 ◽  
Author(s):  
Alina Sionkowska ◽  
Beata Kaczmarek ◽  
Paulina Trokowska ◽  
Iulian Vasile Antoniac
Keyword(s):  
Mechanical Properties ◽  
Thermal Analysis ◽  
Methyl Methacrylate ◽  
Polymer Blends ◽  
New Materials ◽  
Sem Images ◽  
Poly Methyl Methacrylate ◽  
Properties And Characterization ◽  
Properties Of Composites

In this paper several properties of new materials based on polymer blends were studied. The properties of composites made of the blends of chitosan and collagen with addition of poly (methyl methacrylate) and hydroxyapatite were investigated. Mechanical properties, thermal analysis, FTIR spectra and SEM images were obtained for different blends of chitosan/collagen in weight ratios 75/25, 50/50, 25/75. Poly (methyl methacrylate) was used in ratios 15, 50 and 85 wt% based on chitosan. The influence of the addition of hydroxyapatite to the polymer blends on their properties was tested. The results showed that the amount of components can influence on the mechanical properties observed for obtained materials.

Synthesis of Poly(methyl Methacrylate)-Silica Hybrid Materials through Activators Generated by Electron Transfer

2011 ◽  
Vol 233-235 ◽  
pp. 2185-2188
Author(s):  
Shi Xin Du ◽  
Guo Wei Zhou ◽  
Xi Liang Wang ◽  
Lei Zhang
Keyword(s):  
Electron Transfer ◽  
Ascorbic Acid ◽  
Methyl Methacrylate ◽  
Hybrid Materials ◽  
Pmma Layer ◽  
Aget Atrp ◽  
Poly Methyl Methacrylate ◽  
Silica Surfaces ◽  
Silica Core ◽  
Silica Hybrid

Activators generated by electron transfer for atom transfer radical polymerization (AGET ATRP) of methyl methacrylate (MMA) on silica nanoparticles were conducted to create controllable shell on silica surfaces. SiO2–Br, the macroinitiator, was prepared by the reaction of amido groups previously indroduced on silica with 2-bromoisobutyryl bromide, followed by the ATRP of MMA using CuBras the catalyst and ascorbic acid (VC) as the reducing agent in the presence of a limited amount of air. The resulting particles were examined by SEM and TEM. The results indicated that the particles were composed of a silica core and a densely grafted outer poly(methyl methacrylate) (PMMA) layer.

Sign in / Sign up

Export Citation Format

Share Document