Elastomeric magnetic composites - physical properties and network structure

Polimery ◽  
2012 ◽  
Vol 57 (1) ◽  
pp. 25-32 ◽  
Author(s):  
JAN KRUZELAK ◽  
IVAN HUDEC ◽  
RASTISLAV DOSOUDIL
Keyword(s):  
Physical Properties ◽  
Network Structure ◽  
Magnetic Composites

Studies of Polymer-Filler Interaction, Network Structure, Physical Properties, and Fracture of Silica-and Clay-Filled EPDM Rubber in the Presence of a Silane Coupling Agent

1983 ◽  
Vol 56 (4) ◽  
pp. 737-773 ◽  
Author(s):  
P. K. Pal ◽  
S. K. De
Keyword(s):  
Physical Properties ◽  
Network Structure ◽  
Coupling Agent ◽  
Crosslink Density ◽  
Silane Coupling Agent ◽  
Interaction Network ◽  
Epdm Rubber ◽  
Polymer Filler ◽  
Silane Coupling ◽  
Tear Properties

Abstract 1. A silane coupling agent (Si-69) reduces the viscosity and increases the scorch lime in silica- and clay-filled EPDM. The cure lime of silica-filled mixes remained unchanged and that of clay-filled mixes increased on addition of Si-69. 2. In the presence of Si-69, the silica-EPDM system exhibits higher polymer-filler interaction than the clay-EPDM system. 3. Vulcanizates containing Si-69 exhibit higher apparent crosslink density and a higher proportion of polysulfidic crosslinks than the control vulcanizates. 4. Vulcanizates containing Si-69 show improved physical properties. Lower tensile and tear properties in vulcanizates with Si-69 at higher filler loadings is explained via a slippage mechanism. 5. SEM studies of fractured surfaces created under tension, tear, flexing, and abrasion have been made, and changes in the strength of the vulcanizates have been correlated with the fractographs.

scholarly journals Magnetic Composites with Embedded Magnetite Nanoparticles: Preparation, Control of Physical Properties, Applications

2013 ◽  
Vol 13 (2) ◽  
pp. 50-54
Author(s):  
Denis Viktorovich Voronin ◽  
◽  
Alexander Vladimirovich Sadovnikov ◽  
Evgeny Nikolaevich Beginin ◽  
Dmitry Georgievich Shchukin ◽  
...  
Keyword(s):  
Physical Properties ◽  
Magnetite Nanoparticles ◽  
Magnetic Composites

Further Electron Microscope Studies on Colloidal Carbon, and the Role of Surface in Rubber Reenforcement

1942 ◽  
Vol 15 (3) ◽  
pp. 657-663
Author(s):  
W. B. Wiegand
Keyword(s):  
Electron Microscope ◽  
Physical Properties ◽  
Network Structure ◽  
Chemical Compositions ◽  
Microscope Analysis ◽  
Carbon Blacks ◽  
Colloidal Properties ◽  
Electron Microscope Analysis ◽  
Acetylene Carbon

Abstract (1) Based on preliminary electron microscope analysis, rubber carbons are assigned tentative surface values, ranging from one to upward of 12 acres per pound. (2) In all cases particles are of essentially spherical habit. (3) Indications of chain and network structure have appeared in acetylene carbon and lampblack plates (conclusion not final). (4) Physical properties of carbons in rubber are reviewed, and the advantages of “soft” carbons enumerated. (5) Differences in chemical compositions are found not to square with reënforcing differences in rubber. (6) When colloidal properties, tinctorial properties, and rubber properties are plotted against acres per pound, it is found, as anticipated, that surface is, in general, the dominating influence; subject, however, to important and sometimes controlling anomalies. (7) These anomalies appear to be largely resolved on the assumption that three broad types of carbon behavior exist. (I) Carbon-rubber complexes (reënforced rubber) are formed (examples— semireënforcing carbons, Statex and carbon blacks). (II) Carbon-carbon complexes or networks are formed in addition to (I). Examples, acetylene carbon and lampblack. (III) Carbons are inert—neither (I) nor (II) occurs. Examples—thermal carbons. These relations are brought together in Table 1.

Nucleobase-functionalized supramolecular polymer films with tailorable properties and tunable biodegradation rates

2017 ◽  
Vol 8 (9) ◽  
pp. 1454-1459 ◽  
Author(s):  
Chih-Chia Cheng ◽  
Jyun-Jie Huang ◽  
Zhi-Sheng Liao ◽  
Shan-You Huang ◽  
Duu-Jong Lee ◽  
...  
Keyword(s):  
Physical Properties ◽  
Network Structure ◽  
Polymer Films ◽  
Three Dimensional ◽  
Supramolecular Polymer ◽  
Dimensional Network

Nucleobase-functionalized supramolecular films can directly self-assemble into a non-covalently cross-linked three-dimensional network structure with tuned physical properties and biodegradation rates.

scholarly journals The Influence Of The Temperature Of Liquid Nitrogen On The Physical Properties Of Powder Magnetic Composites

2015 ◽  
Vol 60 (2) ◽  
pp. 1323-1326 ◽  
Author(s):  
D. Kapelski ◽  
B. Jankowski ◽  
M. Przybylski ◽  
B. Ślusarek
Keyword(s):  
Physical Properties ◽  
Liquid Nitrogen ◽  
Permanent Magnets ◽  
Liquid Nitrogen Temperature ◽  
Powder Materials ◽  
Soft Magnetic ◽  
Compression Moulding ◽  
Magnetic Composites ◽  
Materials Research

Abstract The paper presents the physical properties of soft magnetic iron composites and Nd-Fe-B bonded permanent magnets measured at room temperature and at liquid nitrogen. The objective of research was a determination of influence of liquid nitrogen temperature on the magnetic properties, resistivity and mechanical properties of different powder magnetic materials. Research was carried out for three powder materials: soft magnetic, i.e. Somaloy 700, AncorLam and hard magnetic powder MQP-B used for production of bonded magnets. Composite specimens were prepared by compression moulding technology.

The Formation and Structure of Vulcanizates

1949 ◽  
Vol 22 (1) ◽  
pp. 96-104
Author(s):  
J. Bardwell ◽  
C. A. Winkler
Keyword(s):  
Mechanical Properties ◽  
Molecular Weight ◽  
Physical Properties ◽  
Network Structure ◽  
Weight Distribution ◽  
Elastic Behavior ◽  
Cross Linking ◽  
Structural Factors ◽  
Experimental Proof ◽  
Vulcanized Rubber

Abstract The characteristic mechanical properties of vulcanized rubber are believed to result from a network structure made up of chainlike molecules bonded together by occasional cross-linkages. In relating the physical properties of the vulcanizate to the structure of the network, it is therefore necessary to consider the concentration of cross-linkages and the molecular-weight distribution of the rubber molecules before cross-linking. Various theories have been proposed for the dependence of elastic properties on these structural factors, but experimental proof of the suggested relations has been meager, largely because of the complexities met with in, vulcanization reactions. In the present investigation some of these difficulties have been overcome, and the quantitative relations between the elastic behavior of GR-S and its network structure have thereby been revealed.

scholarly journals Precise control of synthetic hydrogel network structure via linear, independent synthesis-swelling relationships

2021 ◽  
Vol 7 (7) ◽  
pp. eabe3245
Author(s):  
N. R. Richbourg ◽  
M. Wancura ◽  
A. E. Gilchrist ◽  
S. Toubbeh ◽  
B. A. C. Harley ◽  
...  
Keyword(s):  
Physical Properties ◽  
Network Structure ◽  
A Priori ◽  
Polymer Concentration ◽  
Polymer Network ◽  
Network Models ◽  
Poly Vinyl Alcohol ◽  
Glycol Diacrylate ◽  
Synthesis Conditions ◽  
Precise Control

Hydrogel physical properties are tuned by altering synthesis conditions such as initial polymer concentration and polymer–cross-linker stoichiometric ratios. Traditionally, differences in hydrogel synthesis schemes, such as end-linked poly(ethylene glycol) diacrylate hydrogels and cross-linked poly(vinyl alcohol) hydrogels, limit structural comparison between hydrogels. In this study, we use generalized synthesis variables for hydrogels that emphasize how changes in formulation affect the resulting network structure. We identify two independent linear correlations between these synthesis variables and swelling behavior. Analysis through recently updated swollen polymer network models suggests that synthesis-swelling correlations can be used to make a priori predictions of the stiffness and solute diffusivity characteristics of synthetic hydrogels. The same experiments and analyses performed on methacrylamide-modified gelatin hydrogels demonstrate that complex biopolymer structures disrupt the linear synthesis-swelling correlations. These studies provide insight into the control of hydrogel physical properties through structural design and can be used to implement and optimize biomedically relevant hydrogels.

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