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Titolo:
Stereocontrol in radical polymerization of N,N-dimethylacrylamide and N,N-diphenylacrylamide and thermal properties of syndiotactic poly(methyl acrylate)s derived from the obtained polymers
Autore:
Liu, WH; Nakano, T; Okamoto, Y;
Indirizzi:
Nagoya Univ, Grad Sch Engn, Dept Appl Chem, Chikusa Ku, Nagoya, Aichi 4648603, Japan Nagoya Univ Nagoya Aichi Japan 4648603 a Ku, Nagoya, Aichi 4648603, Japan Nagoya Univ, Grad Sch Engn, JCII, JRCPP,Chikusa Ku, Nagoya, Aichi 4648603,Japan Nagoya Univ Nagoya Aichi Japan 4648603 sa Ku, Nagoya, Aichi 4648603,Japan Nara Inst Sci & Technol, NAIST, Grad Sch Mat Sci, Nara 6300101, Japan NaraInst Sci & Technol Nara Japan 6300101 Mat Sci, Nara 6300101, Japan
Titolo Testata:
POLYMER JOURNAL
fascicolo: 9, volume: 32, anno: 2000,
pagine: 771 - 777
SICI:
0032-3896(2000)32:9<771:SIRPON>2.0.ZU;2-B
Fonte:
ISI
Lingua:
ENG
Soggetto:
ASYMMETRIC ANIONIC-POLYMERIZATION; STEREOCHEMISTRY; FLUOROALCOHOLS; SOLVENTS; POLY(N,N-DIMETHYLACRYLAMIDE); DERIVATIVES;
Keywords:
radical polymerization; tacticity; stereochemistry; concentration effect; solvent effect; acrylamides; poly(methyl acrylate);
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
23
Recensione:
Indirizzi per estratti:
Indirizzo: Okamoto, Y Nagoya Univ, Grad Sch Engn, Dept Appl Chem, Chikusa Ku, Nagoya,Aichi 4648603, Japan Nagoya Univ Nagoya Aichi Japan 4648603 a, Aichi 4648603, Japan
Citazione:
W.H. Liu et al., "Stereocontrol in radical polymerization of N,N-dimethylacrylamide and N,N-diphenylacrylamide and thermal properties of syndiotactic poly(methyl acrylate)s derived from the obtained polymers", POLYM J, 32(9), 2000, pp. 771-777

Abstract

Free-radical polymerizations of N,N-dimethylacrylamide (DMAA) and N,N-diphenylacrylamide (DPAA) were carried out under various conditions. DMAA gave an isotactic-rich polymer in most cases, whereas DPAA gave a syndiotactic polymer. The polymerization stereochemistry was also affected by reaction solvents including toluene, tetrahydrofuran, and fluoroalcohols. It is notable that the stereochemistry of the polymerization depended on monomer concentration: a lower monomer concentration led to a higher isotacticity for DMAA polymerization and a higher syndiotacticity for DPAA polymerization. Thiseffect was explained by assuming that there exist two types of growing radicals having different stereoselectivities. By optimizing the aforementioned reaction conditions, poly(DMAA) with diad isotacticity im) of 77% (polymerization in toluene at -78 degreesC at [M](o) = 0.1 M) and poly(DPAA) with diad syndiotacticity (r) Of 93% (polymerization in THF at -98 degreesC at [M](o) = 0.22 M) were obtained. Stereoregular poly(methyl acrylate)s were derived from the Doly(DPAA)s. Thermal property of the poly(methyl acrylate)s with different tacticities was studied by DSC.

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Documento generato il 04/12/20 alle ore 19:15:59