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Radical copolymerization of acrylonitrile with 2,2,2-trifluoroethyl acrylate for dielectric materials: Structure and characterization
- Source :
- Journal of Polymer Science Part A: Polymer Chemistry, Journal of Polymer Science Part A: Polymer Chemistry, Wiley, 2013, 51, pp.3856-3866. ⟨10.1002/pola.26783⟩
- Publication Year :
- 2013
- Publisher :
- Wiley, 2013.
-
Abstract
- Radical copolymerization based on acrylonitrile (AN) and 2,2,2-Trifluoroethyl acrylate (ATRIF) initited by AIBN was investigated in acetonitrile solution. The resulting pol- y(AN-co-ATRIF) copolymers were characterized by 1 H, 13 C, and 19 F NMR and IR spectroscopy, and size exclusion chromatogra- phy (SEC). Their compositions were assessed by 1 H NMR. The kinetics of radical copolymerization of AN with ATRIF was investigated from sereval experiments achieved at 70 � C from initial (AN)0/(ATRIF)0 molar ratios ranging between 20/80 and 80/20 and was enabled to determine the reactivity ratios of both comonomers. From the monomer—polymer copolymer- ization curve, the Fineman-Ross and Kelen-T€ laws enabled to assess the reactivity ratios (rAN5 r1 5 1.25 6 0.04 and rATRIF 5 r2 5 0.93 6 0.05 at 70 � C) while the revised pat- terns scheme led to r12 5 rAN 5 1.03, and r21 5 rATRIF 5 0.78 at 70 � C. In all cases, rAN x rATRIF product was close to unity, which indicates that poly(AN-co-ATRIF) copolymers exhibit a random structure. This was also confirmed by the Igarashi's and Pyun's laws which revealed the presence of AN-ATRIF, AN-AN, and ATRIF-ATRIF dyads. The Q and e values for ATRIF were also assessed (Q2 5 0.62 and e2 5 0.93). The glass transi- tion temperature values, Tg, of these copolymers increased from 17 to 61 � C as the molar percentage of ATRIF decreased from 77 to 16% in the copolymer. Thermogravimetry analysis of poly(AN-co-ATRIF) copolymers showed a good thermal sta- bility compared to that of poly(ATRIF) homopolymer due to incorporation of AN comonomer. V C 2013 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2013, 51, 3856-3866
- Subjects :
- Polymers and Plastics
reactivity ratio
microstructure
02 engineering and technology
010402 general chemistry
01 natural sciences
fluorocopolymer
chemistry.chemical_compound
Polymer chemistry
Materials Chemistry
Copolymer
Reactivity (chemistry)
radical copolymerization
Acetonitrile
Acrylate
Comonomer
thermal properties
Organic Chemistry
acrylonitrile
021001 nanoscience & nanotechnology
0104 chemical sciences
Thermogravimetry
[CHIM.POLY]Chemical Sciences/Polymers
chemistry
2- trifluoroethyl acrylate
Proton NMR
Acrylonitrile
0210 nano-technology
Subjects
Details
- ISSN :
- 0887624X and 10990518
- Volume :
- 51
- Database :
- OpenAIRE
- Journal :
- Journal of Polymer Science Part A: Polymer Chemistry
- Accession number :
- edsair.doi.dedup.....014309ecabe055963dfe3e7118cb7ed9