scholarly journals Enhancing the self-recovery and mechanical property of hydrogels by macromolecular microspheres with thermal and redox initiation systems

RSC Advances ◽  
2017 ◽  
Vol 7 (26) ◽  
pp. 16015-16021 ◽  
Author(s):  
Chang Huang ◽  
Yifan Li ◽  
Lijie Duan ◽  
Linhui Wang ◽  
Xiuyan Ren ◽  
...  
Keyword(s):  
Mechanical Property ◽  
Mechanical Behavior ◽  
The Self ◽  
Redox Initiation ◽  
Initiation System

A redox initiation system was used to efficiently enhance the mechanical behavior of macromolecular microsphere hydrogels.

scholarly journals Redox initiation in semicontinuous polymerization to search for specific mechanical properties of copolymers

e-Polymers ◽  
2020 ◽  
Vol 20 (1) ◽  
pp. 613-623
Author(s):  
José Manuel Sandoval-Díaz ◽  
Francisco Javier Rivera-Gálvez ◽  
Marta Fernández-García ◽  
Carlos Federico Jasso-Gastinel
Keyword(s):  
Low Cost ◽  
Mechanical Analysis ◽  
Industrial Applications ◽  
Size Exclusion ◽  
Proton Nuclear Magnetic Resonance ◽  
Polymerization Reaction ◽  
Redox Initiation ◽  
Initiation System ◽  
Feeding Profile ◽  
Chain Composition

AbstractIn this work, for a semicontinuous emulsion polymerization reaction, it is shown that using a redox initiation system at 40°C, substantial modifications in copolymer chain composition with conversion can be easily obtained. To test controllable trajectories for comonomer feeding, linear and parabolic profiles were chosen to get different types of chain composition variations for the 50/50 w/w styrene/n-butyl acrylate system. For the “forced composition copolymers,” the molecular weight averages and distribution were obtained by size exclusion chromatography. The composition along conversion was followed by proton nuclear magnetic resonance to determine the weight composition distribution (WCD) of the copolymer chains. Mechanodynamic (dynamic-mechanical analysis), tensile, and hardness tests exhibited consistent results depending on the WCD that outcomes from the respective feeding profile. The results confirm that this methodology is of great potential for industrial applications when looking for synergy in copolymer properties, and low-cost processes.

Thermal and viscoelastic behaviors of nanotube-reinforced polyethylene composite

2011 ◽  
Vol 1312 ◽  
Author(s):  
Ananta Raj Adhikari ◽  
Mircea Chipara ◽  
Karen Lozano
Keyword(s):  
Mechanical Property ◽  
Thermal Stability ◽  
Mechanical Behavior ◽  
Storage Modulus ◽  
Polymer Matrix ◽  
Loss Modulus ◽  
Polyethylene Composite ◽  
Viscoelastic Behaviors ◽  
Thermal Stability Of

ABSTRACTThe effect of processing (shear) time on the mechanical behavior and thermal stability of multiwalled nanotube reinforced polyethylene was investigated. It was observed that the mechanical property (storage modulus, loss modulus) of the composites is process dependant whereas the thermal stability does not. The increase in mechanical behavior is attributed to a stronger interface between the nanotube and the polymer matrix.

Preparation of core–shell attapulgite particles by redox-initiated surface reversible addition–fragmentation chain transfer polymerization via a “graft from” approach

RSC Advances ◽  
2016 ◽  
Vol 6 (17) ◽  
pp. 14120-14127 ◽  
Author(s):  
Haicun Yang ◽  
Sheng Xue ◽  
Ji Pan ◽  
Fanghong Gong ◽  
Hongting Pu
Keyword(s):  
Polymethyl Methacrylate ◽  
Chain Transfer ◽  
Core Shell ◽  
Redox Initiation ◽  
Initiation System ◽  
System P ◽  
Reversible Addition ◽  
Chain Transfer Polymerization

Polymethyl methacrylate layer was grown uniformly from attapulgite by using surface-initiated reversible addition–fragmentation chain transfer polymerization via redox initiation system.

scholarly journals Rock Mechanical Property Influenced by Inhomogeneity

2012 ◽  
Vol 2012 ◽  
pp. 1-9 ◽  
Author(s):  
Yunliang Tan ◽  
Dongmei Huang ◽  
Ze Zhang
Keyword(s):  
Mechanical Property ◽  
Fractal Dimension ◽  
Rock Type ◽  
Fractal Dimensions ◽  
Rock Material ◽  
The Self ◽  
Self Similarity ◽  
Red Sandstone ◽  
Variation Patterns ◽  
Rock Microstructure

In order to identify the microstructure inhomogeneity influence on rock mechanical property, SEM scanning test and fractal dimension estimation were adopted. The investigations showed that the self-similarity of rock microstructure markedly changes with the scanned microscale. Different rocks behave in different fractal dimension variation patterns with the scanned magnification, so it is conditional to adopt fractal dimension to describe rock material. Grey diabase and black diabase have high suitability; red sandstone has low suitability. The suitability of fractal-dimension-describing method for rocks depends on both investigating scale and rock type. The homogeneities of grey diabase, black diabase, grey sandstone, and red sandstone are 7.8, 5.7, 4.4, and 3.4, separately; their average fractal dimensions of microstructure are 2.06, 2.03, 1.72, and 1.40 correspondingly, so the homogeneity is well consistent with fractal dimension. For rock material, the stronger brittleness is, the less profile fractal dimension is. In a sense, brittleness is an image of rock inhomogeneity in macroscale, while profile fractal dimension is an image of rock inhomogeneity in microscale. To combine the test of brittleness with the estimation of fractal dimension with condition will be an effective approach for understanding rock failure mechanism, patterns, and behaviours.

Study on the Mechanical Behavior of Self-Centering Bridge under Horizontal Loading

2014 ◽  
Vol 1049-1050 ◽  
pp. 354-356
Author(s):  
Yuan Yuan Zhao ◽  
Xiao Bo Zhang ◽  
Yan Rong Wang
Keyword(s):  
Cyclic Loading ◽  
Mechanical Behavior ◽  
Rotation Curve ◽  
Mechanical Performance ◽  
The Self ◽  
Horizontal Load ◽  
Theoretical Derivation ◽  
Elastic Range ◽  
Curve Type ◽  
Horizontal Loading

This paper presents a self-centering bridge which is simplified as a deformation body ,while mechanical performance is still in the elastic range ,considering the influence of gravity pier ,the upper structure load ,prestressed tendons and dampers, the horizontal load vs. rotation curve of the self-centering bridge is obtained by theoretical derivation . The study for the self-centering bridge presented in this paper indicates that: under the cyclic loading hysteretic curve type is flag-shaped ,the prestressed tendons provide self-centering ability and dampers provide dissipating energy.

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