Polystyrene/attapulgite nanocomposites prepared viain sitususpension polymerization with redox initiation system

2014 ◽  
pp. n/a-n/a ◽  
Author(s):  
Haicun Yang ◽  
Liu Zhang ◽  
Wenzhong Ma ◽  
Hongting Pu ◽  
Fanghong Gong
Keyword(s):  
Redox Initiation ◽  
Initiation System

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.

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.

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.

Preparation of core-shell polymeric nanocapsules containing liquid cores via redox interfacial-initiated microemulsion polymerization

e-Polymers ◽  
2010 ◽  
Vol 10 (1) ◽  
Author(s):  
Liu Weijun
Keyword(s):  
Electron Microscopy ◽  
Cumene Hydroperoxide ◽  
Water Soluble ◽  
Core Shell ◽  
Microemulsion Polymerization ◽  
Redox Initiation ◽  
One Stage ◽  
Initiation System ◽  
Transmission Electron ◽  
Micro Emulsion

AbstractIn this work, polystyrene (PSt) nanocapsules were successfully prepared by one-stage redox Interfacial-initiated inversed micro-emulsion polymerization of styrene (St), the cumene hydroperoxide (CHPO) and tetraethylenepentamine (TEPA) as the redox initiation pairs. The water-soluble TEPA acted as the reducing component and the oil-soluble CHPO as the oxidant component of the redox initiation system. The primary radicals were produced mainly at the oil/water interface to initiate the polymerization of styrene (St). Core-shell polymeric PSt nanocapsules were obtained by one-stage polymerization via this method, which was supported by the techniques of transmission electron microscopy (TEM) and field emission scanning electron microscopy (FESEM). The particle size and polydispersity index (PDI) of nanocapsules were determined by dynamic light scattering (DLS). The results demonstrated that interfacial-initiated inversed microemulsion polymerization to form core-shell nanocapsules containing liquid cores by one-stage is successful.

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