Influence of network structure on the viscoelastic properties of dynamically vulcanized rubber/plastic blends: An alternative approach to understand the microstructure evolution

2014 ◽  
Vol 1 (1-2) ◽  
pp. 19-33 ◽  
Author(s):  
Pranab Dey ◽  
Kinsuk Naskar ◽  
Biswaranjan Dash ◽  
Sujith Nair ◽  
G. Unnikrishnan ◽  
...  
Keyword(s):  
Microstructure Evolution ◽  
Network Structure ◽  
Viscoelastic Properties ◽  
Vulcanized Rubber ◽  
Alternative Approach

Viscoelastic Properties of Multiple Network Polymers. IV. Copolymers of Styrene and Divinylbenzene

1967 ◽  
Vol 40 (2) ◽  
pp. 476-483 ◽  
Author(s):  
Kyoichi Shibayama ◽  
Yasukira Suzuki
Keyword(s):  
Network Structure ◽  
Viscoelastic Properties ◽  
Network Structures ◽  
Monomer Mixture ◽  
Network Polymer ◽  
Network Polymers ◽  
Composite Polymers ◽  
Degree Of Swelling ◽  
Multiple Network ◽  
Typical Method

Abstract Copolymerization of vinyl and divinyl monomer is a typical method for preparing a network polymer. A multiple network structure, in which one network entangles with another, is supposed to be produced when a network polymer is swollen in the monomer mixture and then polymerization of absorbed monomer is carried out so as to superpose the second network on the first. Viscoelastic properties and degree of swelling in solvents were investigated for composite polymers prepared from styrene and divinylbenzene. Results were consistent with presumed characteristics of multiple network structures.

scholarly journals Self-Healing Behavior of Polymer/Protein Hybrid Hydrogels

Polymers ◽  
2021 ◽  
Vol 14 (1) ◽  
pp. 130
Author(s):  
Maria Bercea
Keyword(s):  
Bovine Serum Albumin ◽  
Network Structure ◽  
Viscoelastic Properties ◽  
Reduced Glutathione ◽  
Viscoelastic Behavior ◽  
The Self ◽  
Poly Vinyl Alcohol ◽  
Self Healing ◽  
Porous Network ◽  
Hybrid Hydrogels

The paper presents the viscoelastic properties of new hybrid hydrogels containing poly(vinyl alcohol) (PVA), hydroxypropylcellulose (HPC), bovine serum albumin (BSA) and reduced glutathione (GSH). After heating the mixture at 55 °C, in the presence of GSH, a weak network is formed due to partial BSA unfolding. By applying three successive freezing/thawing cycles, a stable porous network structure with elastic properties is designed, as evidenced by SEM and rheology. The hydrogels exhibit self-healing properties when the samples are cut into two pieces; the intermolecular interactions are reestablished in time and therefore the fragments repair themselves. The effects of the BSA content, loaded deformation and temperature on the self-healing ability of hydrogels are presented and discussed through rheological data. Due to their versatile viscoelastic behavior, the properties of PVA/HPC/BSA hydrogels can be tuned during their preparation in order to achieve suitable biomaterials for targeted applications.

A Study of the Increase in Tensile Strength of Vulcanized Rubber when it Begins to Age

1949 ◽  
Vol 22 (4) ◽  
pp. 1028-1035
Author(s):  
Robert Judeinstein
Keyword(s):  
Tensile Strength ◽  
Network Structure ◽  
The State ◽  
Maximum Tensile Strength ◽  
Vulcanized Rubber

Abstract In conclusion, the present study confirms the phenomenon of an increase in tensile strength at the beginning of aging. The magnitude of this increase depends on the nature of the acceleration and the state of cure; the tensile strength of an undercured sample increases much more than that of a sample vulcanized to its optimum state of cure, and the maximum tensile strength reached by the former is definitely higher than the maximum tensile strength reached by the latter. The phenomenon is therefore not simply postvulcanization. This increase in tensile strength takes place in the presence of oxygen and also in a vacuum as high as 10−3 mm. In the latter case, measurements of the T-50 value and combined sulfur give indications of an increase in network structure for a given percentage of combined sulfur. Oxygen is a contributing factor in increasing the network structure, but, in its presence, combination of sulfur is not so great and the maximum tensile strength attained is lower.

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.

Application of NR-Based Latex Reclaim: The Link Between Structure and Properties

2007 ◽  
Vol 80 (1) ◽  
pp. 40-60 ◽  
Author(s):  
W. K. Dierkes ◽  
V. V. Rajan ◽  
J. W. M. Noordermeer ◽  
R. Joseph
Keyword(s):  
Viscoelastic Properties ◽  
Crosslink Density ◽  
Virgin Material ◽  
Structure And Properties ◽  
Elongation At Break ◽  
Rubber Blends ◽  
Compression Set ◽  
Vulcanized Rubber ◽  
The Matrix ◽  
Property Profile

Abstract Natural rubber based waste latex rubber (WLR) that is reclaimed with diphenyldisulphide by a thermo-mechanical process is blended with virgin rubber in different proportion to study the change in mechanical and viscoelastic properties. Two types of WLR differing mainly in the amount of polysulfidic linkages are reclaimed and blended with a virgin rubber compound with and without adjustment of the curing system, the former in order to compensate for the extra input of sulfur and accelerators due to the addition of reclaim. The cure behavior, final crosslink density and distribution, mechanical properties and dynamic viscoelastic properties of the blends with reclaimed WLR are compared to the property profile of the virgin material. The morphology of the blends as well as sulfur distribution between the matrix and the reclaim particle is analyzed. With increasing concentrations of WLR reclaim, tensile strength, tear strength and elongation at break decrease, whereas modulus at 100% elongation, compression set and hardness show an increase. The storage modulus of the vulcanized rubber blends decreases with increasing WLR reclaim content in the blend. Swelling measurements show that the crosslink density is reduced for the adjusted cure system but increased for a fixed cure system. These influences of reclaimed WLR on the property profile of a virgin compound will be discussed fundamentally in terms of morphology and crosslink distribution.

Photochemical control of network structure in gels and photo-induced changes in their viscoelastic properties

2007 ◽  
Vol 56 (1-2) ◽  
pp. 285-289 ◽  
Author(s):  
Nobuhiko Hosono ◽  
Hidemitsu Furukawa ◽  
Yuichi Masubuchi ◽  
Toshiyuki Watanabe ◽  
Kazuyuki Horie
Keyword(s):  
Network Structure ◽  
Viscoelastic Properties ◽  
Induced Changes

Viscoelastic Properties of Constant Viscosity Natural Rubber with Mercaptan

2014 ◽  
Vol 884-885 ◽  
pp. 353-358
Author(s):  
Zong Qiang Zeng ◽  
He Ping Yu ◽  
Qi Fang Wang ◽  
Fei Yun Wei ◽  
Hong Chao Liu
Keyword(s):  
Natural Rubber ◽  
Viscoelastic Properties ◽  
Response Curve ◽  
Viscoelastic Behavior ◽  
Rubber Compound ◽  
Vulcanized Rubber ◽  
Frequency Scanning ◽  
Constant Viscosity

2-mercaptobenzothiazole was used to deal with natural rubber (NR) latex to prepare constant viscosity natural rubber (CV-NR) in this research. The dynamic viscoelastic behavior of CV-NR of raw rubber, rubber compound and vulcanized rubber was studied through strain and frequency scanning on rubber processing analyzer, and then it was compared with the response curve of NR.

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