scholarly journals Improvement of the Strength Properties and Impact Resistance of the Cement Composite Materials by the use of Surface Modification of the Aramid Fibers

2015 ◽  
Vol 19 (1) ◽  
pp. 100-108
Author(s):  
Jeong-Soo Nam ◽  
Jae-Chul Yoo ◽  
Gyu-Yong Kim ◽  
Hong-Seop Kim ◽  
Joong-Kyu Jeon
Keyword(s):  
Surface Modification ◽  
Composite Materials ◽  
Impact Resistance ◽  
Cement Composite ◽  
Strength Properties ◽  
Aramid Fibers

Surface modification of aramid fibers via ammonia-plasma treatment

2013 ◽  
Vol 131 (10) ◽  
pp. n/a-n/a ◽  
Author(s):  
Shuang Li ◽  
Keqing Han ◽  
Huaiping Rong ◽  
Xuanzhe Li ◽  
Muhuo Yu
Keyword(s):  
Surface Modification ◽  
Plasma Treatment ◽  
Aramid Fibers ◽  
Ammonia Plasma

scholarly journals Carbon Fiber Composites of Pure Polypropylene and Maleated Polypropylene Blends Obtained from Injection and Compression Moulding

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
D. Pérez-Rocha ◽  
A. B. Morales-Cepeda ◽  
F. Navarro-Pardo ◽  
T. Lozano-Ramírez ◽  
P. G. LaFleur
Keyword(s):  
Mechanical Performance ◽  
Impact Resistance ◽  
Structural Features ◽  
Strength Properties ◽  
Favourable Effect ◽  
Carbon Fiber Composites ◽  
Compression Moulding ◽  
Scanning Calorimetry ◽  
Noticeable Effect ◽  
Maleated Polypropylene

A comparative study of the mechanical performance of PP and PP/PP-g-MAH blends reinforced with carbon fibre (CF) obtained by two different moulding techniques is presented. Three filler contents were used for fabricating the composites: 1, 3, and 5 pph (parts per hundred). The crystallisation behaviour of the composites was studied by differential scanning calorimetry. Morphological and structural features of these samples were observed by atomic field microscopy and Fourier-transform infrared spectroscopy, respectively. Mechanical properties of the injection and compression moulded composites were evaluated by means of tensile and impact resistance tests. The fracture surface of the impacted samples was observed by scanning electron microscopy. The processing method had a noticeable effect on the results obtained in these tests. Young’s modulus was enhanced up to 147% when adding 5 pph CF to a PP matrix when processed by compression moulding. Addition of PP-g-MAH and CF had a favourable effect on the tensile and impact strength properties in most samples; these composites showed improved performance as the filler content was increased.

scholarly journals SURFACE MODIFICATION OF TITANIUM DIOXIDE NANOPARTICLES WITH ACRYLIC ACID/ISOBUTYLENE COPOLYMER UNDER ULTRASONIC TREATMENT

2019 ◽  
Vol 16 (32) ◽  
pp. 338-344
Author(s):  
Nikolay A. BULYCHEV ◽  
Lev N. RABINSKIY
Keyword(s):  
Titanium Dioxide ◽  
Surface Modification ◽  
Composite Materials ◽  
Acrylic Acid ◽  
Ultrasonic Treatment ◽  
Titanium Dioxide Nanoparticles ◽  
Polymer Coatings ◽  
Pigment Surface ◽  
Electrokinetic Sonic Amplitude ◽  
Modification Of Titanium

The influence of the ultrasonic treatment of block copolymer solution on its solid-liquid interface behavior was investigated in detail. The surface modification of titanium dioxide nanoparticles in aqueous dispersions of specially tailor-made periodic acrylic acid/isobutylene copolymer by ultrasonic treatment was studied in order to get new approaches for the creation of hybrid composite materials or polymer coatings. The pigment surface modification by the above copolymer was comparatively investigated regarding conventional adsorption as contrasted to an ultrasonic treatment assisted procedure. The course and efficiency of the polymer adsorption onto the pigment surface were quantified by electrokinetic sonic amplitude measurements. The higher efficiency of the pigment surface coating by the copolymer as achieved by ultrasonic treatment in comparison to conventional adsorption is a consequence of ultrasonically induced pigment surface activation. Two perspective avenues of the utilization of the discovered effects for creation of organic-inorganic composite materials are anticipated: the nanoparticles could first be treated by ultrasound in the presence of polymers and so create a surface modifying coating and the second option is an entrainment of the nanoparticles into the monomer matrix which can be polymerized afterward yielding a polymer with immobilized nanoparticles.

scholarly journals DESIGN OF CEMENT COMPOSITES WITH INCREASED IMPERMEABILITY

Vestnik MGSU ◽  
2016 ◽  
pp. 72-81
Author(s):  
Roman Sergeevich Fedyuk
Keyword(s):  
Composite Materials ◽  
Cement Composite ◽  
Vapor Permeability ◽  
Cement Stone ◽  
Cement Composites ◽  
Hydrated Cement ◽  
Body Density ◽  
Scale Levels ◽  
Positive Effect ◽  
Improved Characteristics

The paper deals with the development of composite binders for producing concrete with improved characteristics of gas, water and vapor permeability. The authors investigate the processes of composite materials formation in order of decreasing scale levels from macro to nanostructures. The criteria for optimization of the volume of dispersed additives in concrete are offered. The authors theoretically studied the technological features of the formation of hydrated cement stone structure. A positive effect of nanodispersed additives on the structure and physico-mechanical properties of cement composite materials are predicted. Thanks to its improved features, such as good ratio of strength and body density, high density and lifetime, the modified concrete may be used when solving various practical tasks of the construction branch.

scholarly journals The effect of curing conditions on the mechanical properties of SIFCON

2021 ◽  
Vol 20 (1) ◽  
pp. 37-51
Author(s):  
Kubilay Akçaözoğlu ◽  
◽  
Adem Kıllı ◽  
Keyword(s):  
Mechanical Properties ◽  
Flexural Strength ◽  
Steel Fiber ◽  
Impact Resistance ◽  
Strength Properties ◽  
Fiber Reinforced Concrete ◽  
Curing Conditions ◽  
Accelerated Curing ◽  
Aspect Ratios ◽  
Curing Method

In this study, the effect of curing conditions on the mechanical properties of slurry infiltrated fiber reinforced concrete (SIFCON) was investigated. For this purpose, SIFCON samples containing 4% and 8% steel fiber with two different aspect ratios were produced. The samples were subjected to three different curing types, namely standard, dry and accelerated curing methods. Ultrasonic wave velocity, flexural strength, fracture toughness, compressive strength, impact resistance and capillary water absorption tests were performed on the samples. The highest flexural strength was found to be achieved in the samples with an aspect ratio of 55 and a content of 8% steel fiber. The most suitable curing method was determined as the standard curing method and the best flexural strength was achieved at the rate of 8%. According to the test results, the best strength properties were achieved in the samples exposed to the standard curing method. In addition, the samples exposed to the accelerated curing method showed satisfactory values. The accelerated curing method can be used as an alternative in SIFCON production especially in applications requiring mass production.

Innovative research carried out at the nanocenter of the NRC “Kurchatov Institute” – CRISM “Prometey”

2021 ◽  
pp. 82-108
Author(s):  
T. I. Bobkova ◽  
R. Yu. Bystrov ◽  
O. V. Vasilieva ◽  
A. F. Vasiliev ◽  
D. A. Gerashchenkov ◽  
...  
Keyword(s):  
Surface Modification ◽  
Composite Materials ◽  
Magnetron Sputtering ◽  
Alternative Energy ◽  
Technical Equipment ◽  
Structural Ceramics ◽  
Kurchatov Institute ◽  
Biological Objects ◽  
The Past ◽  
Innovative Research

This article presents the results of comprehensive innovative research carried out over the past 15 years at the Nanocenter of the NRC “Kurchatov Institute” – CRISM “Prometey” in the following areas: the creation of coatings based on quasicrystals of the Al-Cu-Fe system, laser synthesis technologies, systems electromagnetic protection of technical equipment and biological objects, structural ceramics and composite materials, technologies for surface modification and magnetron sputtering, obtaining powders by melt spraying, hydrogen and alternative energy.

Methods for Improving the Impact Resistance of Composite Materials

2009 ◽  
pp. 134-134-25 ◽  
Author(s):  
PWR Beaumont ◽  
PG Riewald ◽  
C Zweben
Keyword(s):  
Composite Materials ◽  
Impact Resistance ◽  
The Impact
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