Toughening of an epoxy thermoset with poly[styrene-alt-(maleic acid)]-block-polystyrene-block-poly(n-butyl acrylate) reactive core–shell particles

RSC Advances ◽  
2016 ◽  
Vol 6 (42) ◽  
pp. 35621-35627 ◽  
Author(s):  
Ren He ◽  
Xiaoli Zhan ◽  
Qinghua Zhang ◽  
Fengqiu Chen
Keyword(s):  
Emulsion Polymerization ◽  
Maleic Acid ◽  
Butyl Acrylate ◽  
Chain Transfer ◽  
Core Shell ◽  
Reversible Addition ◽  
Raft Agent ◽  
Shell Particles

Reactive core–shell particles for epoxy toughening were synthesized via reversible addition–fragmentation chain transfer emulsion polymerization mediated by an amphiphilic macro-RAFT agent followed by core-crosslinking to increase stability.

Preparation of Self-Crosslinking Core-Shell Latex at Ambient Temperature

2010 ◽  
Vol 174 ◽  
pp. 466-469
Author(s):  
Tang Wei Wang ◽  
Song Ya Zhang ◽  
Zhong Xiao Li ◽  
Jia Ling Pu
Keyword(s):  
Butyl Acrylate ◽  
Chain Transfer ◽  
Average Diameter ◽  
Degree Of Polymerization ◽  
Latex Film ◽  
Cross Linking ◽  
Core Shell ◽  
Reversible Addition ◽  
Raft Agent ◽  
Calculated Average

A reversible addition fragmentation chain transfer (RAFT) agent, 2- (dodecylthiocarbonothioylthio)propanoic acid (RAFT-1), was synthesized and characterized. Equimolar doses of acrylic acid (AA) and n-butyl acrylate were successively polymerized in the presence of RAFT-1 to give an amphiphilic macro RAFT agent (RAFT-2), which had a calculated average degree of polymerization of ten. Core-shell poly (butyl acrylate-co-diacetoneacrylamide) latex was prepared by using RAFT-2 as a reactive surfactant. The latex was narrowly distributed and very stable, which had a solid concentration as high as 45 wt.% and an average diameter of about 50 nm, Latex films were prepared with the core-shell emulsion and small amount of cross-linking agent, adipic dihydrazide. Results showed that cross-linking reaction occurred with the evaporation of water. The resulting cross-linked latex film was tough and transparent.

Grafting of n-Butyl Acrylate and N,N'-Dimethyl Acrylamide from Poly(divinylbenzene) Microspheres by RAFT Polymerization

2005 ◽  
Vol 58 (6) ◽  
pp. 468 ◽  
Author(s):  
Raymond Joso ◽  
Martina H. Stenzel ◽  
Thomas P. Davis ◽  
Christopher Barner-Kowollik ◽  
Leonie Barner
Keyword(s):  
Butyl Acrylate ◽  
Chain Transfer ◽  
Raft Polymerization ◽  
Total Reflection ◽  
Attenuated Total Reflection ◽  
Weight Increase ◽  
Reversible Addition ◽  
Raft Agent ◽  
Grafting From ◽  
Particle Weight

N,N´-Dimethyl acrylamide and n-butyl acrylate have been grafted from crosslinked poly(divinylbenzene) core microspheres by both reversible addition–fragmentation chain transfer (RAFT) polymerization and conventional free radical polymerization. The microspheres were prepared by precipitation polymerization utilizing 55 and 80 wt. % divinylbenzene (DVB), respectively. The RAFT agent cumyl dithiobenzoate (CDB) was utilized and grafting was performed in toluene at 80°C with 2,2´-azoisobutyronitrile (AIBN) as thermal initiator. Particle weights increased up to 6% for poly(n-butyl acrylate) and up to 15% for poly(N,N´-dimethyl acrylamide). Grafting from poly(DVB-55) microspheres results in a higher particle weight increase than grafting from poly(DVB-80) microspheres while using the same RAFT agent concentrations. The particle weight increase is approximately higher by a factor of two. The grafted microspheres were characterized by attenuated total reflection (ATR) IR spectroscopy and scanning electron microscopy.

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