Diperoxides with differing thermal stabilities of the peroxide groups as initiators of radical polymerization and block copolymerization

1970 ◽  
Vol 12 (2) ◽  
pp. 514-524 ◽  
Author(s):  
A.I. Prisyazhnyuk ◽  
S.S. Ivanchev
Keyword(s):  
Radical Polymerization ◽  
Block Copolymerization ◽  
Thermal Stabilities

Synthesis and Self-Assemble Behavior of Block Copolymerization of Vinyl Acetate and N-Vinylacetamide

2013 ◽  
Vol 645 ◽  
pp. 10-14
Author(s):  
Yu Lou ◽  
Dong Jian Shi ◽  
Wei Fu Dong ◽  
Ming Qing Chen
Keyword(s):  
Block Copolymer ◽  
Radical Polymerization ◽  
Vinyl Acetate ◽  
Microphase Separation ◽  
Molar Ratio ◽  
Block Copolymerization ◽  
Bulk State ◽  
Self Assembled

Polymerizations of VAc was carried out using AIBN as the initiator and DIP as the MADIX agent precursor. Then, block copolymer PVAc-b-PNVA had been synthesized by RAFT radical polymerization in the presence of PVAc-DIP as macro CTA. The length of blocks could be tuned by changing the molar ratio of NVA and VAc. Block copolymer PVAc-b-PNVA self-assembled into micelles in solution, and underwent microphase separation in bulk state.

scholarly journals Polymers Based on Methacrylate Bearing Coumarin Side Group: Synthesis via Free Radical Polymerization, Monomer Reactivity Ratios, Dielectric Behavior, and Thermal Stabilities

2012 ◽  
Vol 2012 ◽  
pp. 1-13 ◽  
Author(s):  
Nursel Ayaz ◽  
Feride Bezgin ◽  
Kadir Demirelli
Keyword(s):  
Free Radical ◽  
Radical Polymerization ◽  
Free Radical Polymerization ◽  
Reactivity Ratio ◽  
Dielectric Behavior ◽  
Reactivity Ratios ◽  
Monomer Reactivity Ratios ◽  
Thermal Stabilities ◽  
Dichloromethane Solution ◽  
H Nmr

Copolymerization and homopolymerization of 7-methacryloyloxy coumarin (MAOC) and its copolymers with benzyl methacrylate (BMA), methyl methacrylate (MMA), ethyl methacrylate (EMA), and isobuthyl methacrylate (IBMA) were performed by the free radical polymerization method (FRP) at low conversions (<15%). The resulting polymers were characterized by FTIR, 1H NMR, GPC, DSC, and TGA. The monomer reactivity ratios of MAOC and BMA were computed using Kelen-Tüdös (K-T) and Fineman-Ross (F-R) methods and were found to be r1=0.45, r2=1.29; r1=0.46; r2=1.33, respectively (r1 is monomer reactivity ratio of MAOC). Blends of poly(MAOC) and poly(BMA) obtained via FRP method were prepared by casting films from dichloromethane solution and were characterized by DTA and TGA techniques. Dielectric measurements for MAOC homopolymer and its copolymers with EMA, MMA, and IBMA were carried out by means of an impedance analyzer as a function of temperature and frequence. Dielectric properties of polymer samples prepared in a plate form were measured at room temperature over the frequency range 0.1 kHz–2 MHz and given as compared with each other.

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