Effect of content of crosslinking agent on the porous structure and properties of the carboxylic cation exchangers solose K

1987 ◽  
Vol 29 (5) ◽  
pp. 1064-1069 ◽  
Author(s):  
Ye.I. Mal'ko ◽  
A.A. Tager ◽  
V.P. Vorob'ev ◽  
K.S. Pozhivilko ◽  
Yu.Ya. Dumpis ◽  
...  
Keyword(s):  
Porous Structure ◽  
Crosslinking Agent ◽  
Structure And Properties ◽  
Cation Exchangers

Processes of the Foaming Mixture’ Components Interaction during the Foam Glass Synthesis

2020 ◽  
Vol 992 ◽  
pp. 271-276
Author(s):  
B.M. Goltsman ◽  
L.A. Yatsenko ◽  
Elena A. Yatsenko
Keyword(s):  
Porous Structure ◽  
Internal Structure ◽  
Foam Glass ◽  
Combustion Process ◽  
Structure And Properties ◽  
Stabilizing Agent

The prospects for the use of foam glass in construction were described. The modern compositions of foaming mixtures for foam glass synthesis were considered. Compositions for studying the influence of the foaming mixture components on the formation of foam glass porous structure were developed, their internal structure and properties were studied. The role of each component of the mixture on its foaming was revealed. Glycerol is a pore-forming agent, which decomposes and produces foaming gases. Waterglass is a stabilizing agent reducing glycerol combustion process. Recommendations on the application of the described patterns in the foam glass synthesis were given.

Influence of the length of the molecule of crosslinking agent and its nature on the value of the parameters of the porous structure of polymeric sorbents

1990 ◽  
Vol 32 (4) ◽  
pp. 666-670
Author(s):  
A.A. Tager ◽  
M.V. Tsilipotkina ◽  
L.C. Kolmakova ◽  
E.V. Morozov ◽  
V.M. Balakin ◽  
...  
Keyword(s):  
Porous Structure ◽  
Crosslinking Agent ◽  
Polymeric Sorbents

The structure and properties of porous copper produced by powder metallurgy using NaCl as space holder agent

2021 ◽  
Vol 94 ◽  
pp. 2-7
Author(s):  
Trung Tran Bao ◽  
◽  
Phuong Doan Dinh ◽  
Toan Nguyen Van ◽  
Hoan Trinh Minh ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Powder Metallurgy ◽  
Porous Structure ◽  
Distilled Water ◽  
Structure And Properties ◽  
Space Holder ◽  
Hydrogen Environment ◽  
Porous Copper ◽  
Ultrasonic Process ◽  
Porosity And Permeability

In this work, the porous copper samples were produced via the powder metallurgy using NaCl as the space holder. Cu and NaCl powders were mixed by a double-cone mixing machine and then pressed into the cylindrical pellets (12 mm in diameter) at the pressure of 100 MPa. The sintering was done in a tube furnace using hydrogen environment at 900 oC for 1h. After sintering, the samples were subjected to vibration in water for 3h to remove the NaCl particles. The results showed that the porous copper has been produced and NaCl has been completely removed after the ultrasonic process in distilled water. Using NaCl space holder, the porous structure has two types of pores: the macropore induced by the removement of NaCl and the micro-pore induced by the partial sintering of Cu powders. With increase of NaCl content from 0 to 20 wt.%, the porosity and permeability of the samples increased from 24 to 58 % and from 1.53×10-13 to 12.46×10-13 m2, respectively. However, the compressive strength of the samples has a decrease with the increase of porosity resulted from the increase of NaCl content.

Comprehensive insight of crosslinking agent concentration influence on starch‐based aerogels porous structure

2021 ◽  
pp. 50863
Author(s):  
Paulo H. Camani ◽  
Maria G. M. Gonçalo ◽  
Rennan F. S. Barbosa ◽  
Derval S. Rosa
Keyword(s):  
Porous Structure ◽  
Crosslinking Agent

scholarly journals Structure and properties of fine concretes based on composite binders

Vestnik MGSU ◽  
2019 ◽  
pp. 322-331 ◽  
Author(s):  
Aleksey I. Kharchenko ◽  
Vyacheslav A. Alekseev ◽  
Igor’ Ya. Kharchenko ◽  
Dmitriy A. Bazhenov
Keyword(s):  
Moisture Content ◽  
Portland Cement ◽  
Porous Structure ◽  
Crack Resistance ◽  
Chemical Activation ◽  
Silica Sand ◽  
Structure And Properties ◽  
Strength Performance ◽  
Technical Properties ◽  
Performance Results

Introduction. Wide introduction of fine concretes in the practice of monolithic building construction is limited by their low crack resistance due to considerable shrinkage. To reduce the shrinkage adverse effect on structure and properties of the fine concretes, it is suggested to use for their preparation composite binders, including expanding sulphoaluminate-based cements. Using the fine concrete with enhanced physical and technical properties improves produceability of construction, reduces labor input of concrete casting and allows building installations of complicated architectural forms. Material and methods. To study processes of fine concrete structure formation and properties, concrete mixes were prepared on the base of medium silica sand, dispersed ash entrainment and expanding additive. Activity of the ash entrainment increased at the expense of mechanical and chemical activation. Dispersity of the particles was monitored by means of laser granulometry. The composite binder was prepared by means of thorough homogenization of the basic CEM 42.5 Portland cement and different sorts of mineral aggregates, including an expanding additive based on calcium sulphoaluminate. Maturing conditions at a certain moisture content were simulated for every composition with subsequent evaluation of concrete performance. Results. Results of the study include effect of different mineral additives distinguishing in mineral composition, dispersivity and degree of hydraulic activity on shrinkage amount and kinetics, fine concrete porous structure parameters and strength. It is understood that amount of expansion has an effect on porous structure characteristics of the fine concrete and its strength performance. The study assessed an influence of maturing conditions on the various-composition fine concrete. A considerable influence of maintaining optimal moisture content during hydration on fine concrete technical properties is committed. Conclusions. It is understood that introduction of up to 10 % of expanding sulphoaluminate-based component in basic Portland cement allows to obtain fine concrete with enhanced crack resistance, impenetrability and longevity.

scholarly journals Trends of Joining Composite AlSi-SiC Foams

2019 ◽  
Vol 19 (1) ◽  
pp. 70-82 ◽  
Author(s):  
J. Nowacki ◽  
A. Sajek
Keyword(s):  
Surface Roughness ◽  
Porous Structure ◽  
Surface Preparation ◽  
Structure And Properties ◽  
Numerous Application ◽  
Joint Structure ◽  
Composite Foams ◽  
Structure Properties

AbstractThe paper consist of characterization of the essence of structure, properties and application of AlSi-SiC composite foams as well as limitations and possibilities of their joining. Porous structure with porosity up to 80% and exceptional properties of aluminium foams are the reason of their numerous application and interest of their joining. Consideration of methods of welding, soldering and gluing AlSi9-SiC10 composite foams, the joint structure, and properties. Recommendations for surface preparation of foam, and different joining procedures aimed at control the porosity of the foam and glued surface roughness were established. Result of EDS and XRD investigations of the AlSi9-SiC10 composite foams joint were considered.

Structure and Properties of Vulcanized Rubbers from Oligomers

1972 ◽  
Vol 45 (6) ◽  
pp. 1597-1603
Author(s):  
A. S. Lykin ◽  
Yu G. Sbytov ◽  
I. M. Tunkel
Keyword(s):  
Maximum Degree ◽  
Structural Parameters ◽  
Crosslinking Agent ◽  
Structure And Properties ◽  
Equimolar Ratio ◽  
Good Balance ◽  
Rubber Compounds ◽  
Reactive Groups

Abstract Structural parameters of the vulcanization network of oligomer rubber compounds depend to a much greater degree on the extent of crosslinking than those for rubber compounds based on conventional rubbers. A condition necessary for obtaining oligomer rubber compounds exhibiting a good balance of properties is the maximum possible extent of crosslinking which is determined by the maximum degree of oligomer and crosslinking agent functionalities and the equimolar ratio of their reactive groups.

Structure of second phases in TiAl alloys containing Cr and B

1991 ◽  
Vol 49 ◽  
pp. 576-577
Author(s):  
Ernest L. Hall ◽  
Shyh-Chin Huang
Keyword(s):  
Grain Size ◽  
Second Phase ◽  
Structure And Properties ◽  
Tial Alloys ◽  
Second Phases ◽  
Interstitial Elements

Addition of interstitial elements to γ-TiAl alloys is currently being explored as a method for improving the properties of these alloys. Previous work in which a number of interstitial elements were studied showed that boron was particularly effective in refining the grain size in castings, and led to enhanced strength while maintaining reasonable ductility. Other investigators have shown that B in γ-TiAl alloys tends to promote the formation of TiB2 as a second phase. In this study, the microstructure of Bcontaining TiAl alloys was examined in detail in order to describe the mechanism by which B alters the structure and properties of these alloys.

Relationships between hierarchical structure and properties in macromolecular systems

1987 ◽  
Vol 45 ◽  
pp. 440-443
Author(s):  
E. Baer
Keyword(s):  
Uniaxial Tension ◽  
Hierarchical Structure ◽  
Inorganic Material ◽  
Hierarchical Structures ◽  
Bone Collagen ◽  
Structure And Properties ◽  
Connective Tissues ◽  
Scale Level ◽  
Fibrous Protein ◽  
Macromolecular Systems

The most advanced macromolecular materials are found in plants and animals, and certainly the connective tissues in mammals are amongst the most advanced macromolecular composites known to mankind. The efficient use of collagen, a fibrous protein, in the design of both soft and hard connective tissues is worthy of comment. Very crudely, in bone collagen serves as a highly efficient binder for the inorganic hydroxyappatite which stiffens the structure. The interactions between the organic fiber of collagen and the inorganic material seem to occur at the nano (scale) level of organization. Epitatic crystallization of the inorganic phase on the fibers has been reported to give a highly anisotropic, stress responsive, structure. Soft connective tissues also have sophisticated oriented hierarchical structures. The collagen fibers are “glued” together by a highly hydrated gel-like proteoglycan matrix. One of the simplest structures of this type is tendon which functions primarily in uniaxial tension as a reinforced elastomeric cable between muscle and bone.

The Structure and Properties of MoSi2 Thin Film in Mos Process

1980 ◽  
Vol 38 ◽  
pp. 326-327
Author(s):  
C.K. Wu ◽  
P. Chang ◽  
N. Godinho
Keyword(s):  
Thin Film ◽  
Integrated Circuits ◽  
High Performance ◽  
Large Scale ◽  
Process Development ◽  
Structure And Properties ◽  
Metal Silicides ◽  
High Oxidation ◽  
Important Approach ◽  
High Oxidation Resistance

Recently, the use of refractory metal silicides as low resistivity, high temperature and high oxidation resistance gate materials in large scale integrated circuits (LSI) has become an important approach in advanced MOS process development (1). This research is a systematic study on the structure and properties of molybdenum silicide thin film and its applicability to high performance LSI fabrication.

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