Copolymerization of Benzylidene malononitrile with methyl methacrylate and spectroscopic studies before and after irradiation with gamma rays of the obtained copolymer

Sayyah, S. M.; El-Shafiey, Z. A.; El‐Sockary, Maher A.; Kandil, Usama F.

doi:10.1080/00914030213036

Cited by 36 publications

(13 citation statements)

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“…The clear indication of the metal complex intervention with the PMMA is also confirmed by the appearance of a multiplet signal at d ¼ 7.166 in case of the Cr (III) Salen, and d ¼ 7.160, 7.225, and 7.248 for Ni (II) salen, which could be due to the phenyl ring protons, and the characteristic methylene proton spectrum at 1.866 for Cr (III), slightly shifted to 1.884 as exhibited by the blank and Ni (II) PMMA samples; see Figure 6(a and b). The aforementioned facts could assist in confirming the postulation of double bond delocalization that is enhanced due to its attachment to the phenyl ring as similarly suggested by Sayyah et al [28]. In general, both PMMA prepared in presence of the Ni (II) and Cr (III) Salen complexes can be described as of distinguished syndiotactic structure due to the structural interaction of both Ni (II) and Cr (III) Salen complex molecules.…”

Section: Structural Aspectssupporting

confidence: 69%

Salen Transition Metal Complexes as Catalysts for the Synthesis of Photostable Poly(methylmethacrylate)

Mekewi

2005

International Journal of Polymeric Materials

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Polymethylmethacrylate (PMMA) was prepared in presence of Cr (III) and Ni (II) Salen complex compounds as catalysts for the controlled radical polymerization of the methylmethacrylate monomer. The PMMA structure was examined through FT-IR analysis in which characteristic bands of structural tacticity were observed. The PMMA order of tacticity was also identified using 1 HNMR where clear indications of increased polymer tacticity and metal complex intervention with the PMMA growing chains were identified. PMMA samples, prepared in presence of Ni (II) and Cr (III) Salen complex compound, were subjected to various doses of UV light and significant resistance to degradation was noticed. The weight average molecular weight values, using GPC technique, were monitored as the measuring parameter for the PMMA photostability. The results of the present work strongly recommend the use of transition metal Salen complexes as promising catalysts for polymerization of PMMA due to their characteristic activity and the sound resistance toward UV photodegradation the polymer exhibited.

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Section: Structural Aspectssupporting

confidence: 69%

Salen Transition Metal Complexes as Catalysts for the Synthesis of Photostable Poly(methylmethacrylate)

Mekewi

2005

International Journal of Polymeric Materials

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“…Ring-unsubstituted 2-phenyl-1,1-dicyanoethylene was copolymerized with styrene (6), vinyl ethers (7), methyl methacrylate (8), and N-vinyl-2-pyrrlidone (9). In relation to applications, piezoelectric activity was observed in copolymer of 1,1-dicyanoethylene (vinyledene cyanide) and vinyl acetate (10).…”

Section: Introductionmentioning

confidence: 97%

Novel Copolymers of Vinyl Acetate and Halogen Ring‐Disubstituted 2‐Phenyl‐1,1‐dicyanoethylenes

Kharas

Russell

Cisler

et al. 2008

Journal of Macromolecular Science, Part A

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Electrophilic trisubstituted ethylene monomers, halogen ring-disubstituted 2-phenyl-1,1-dicyanoethylenes, RC 6 H 3 CH5 5C(CN) 2 (where R is 2,3-diCl, 2,4-diCl, 2,6-diCl, 3,4-diCl, 3,5-diCl, 2,4-diF, 2,5-diF, 2,6-diF, 3,4-diF, 3,5-diF, 2-Cl, 6-F) were synthesized by piperidine catalyzed Knoevenagel condensation of ring-substituted benzaldehydes and malononitrile, and characterized by CHN elemental analysis, IR, 1 H-and 13 C-NMR. Novel copolymers of the ethylenes and vinyl acetate were prepared at equimolar monomer feed composition by solution copolymerization in the presence of a radical initiator (ABCN) at 708C. The composition of the copolymers was calculated from nitrogen analysis, and the structures were analyzed by IR, 1 H and 13 C-NMR, GPC, DSC, and TGA. High T g of the copolymers, in comparison with that of polyvinyl acetate, indicates a substantial decrease in chain mobility of the copolymer due to the high dipolar character of the trisubstituted ethylene monomer unit. The gravimetric analysis indicated that the copolymers decompose in the 220-8008C range.

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“…Copolymerization of TSE having double bonds substituted with halo, cyano, and carbonyl groups and electron-rich monosubstituted ethylenes such as styrene, N-vinylcarbazole, and vinyl acetate (3 -5) show a tendency toward the formation of alternating copolymers. Ring -unsubstituted 2-phenyl-1,1-dicyanoethylene was copolymerized with styrene (6), vinyl ethers (7), methyl methacrylate (8), and N-vinyl-2-pyrrlidone (9). In relation to applications, piezoelectric activity was observed in copolymer of 1,1-dicyanoethylene (vinyledene cyanide) and vinyl acetate (10).…”

Section: Introductionmentioning

confidence: 97%

Novel Copolymers of Vinyl Acetate and Halogen Ring‐Substituted 2‐Phenyl‐1,1‐dicyanoethylenes

Kharas

Russell

Ward

et al. 2007

Journal of Macromolecular Science, Part A

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Electrophilic trisubstituted ethylene monomers, some ring-substituted 2-phenyl-1,1-dicyanoethylenes, RC 6 H 4 CH5 5C(CN) 2 (where R is 2-Br, 3-Br, 4-Br, 2-Cl, 3-Cl, 4-Cl, 2-F, 3-F, 4-F) were synthesized by piperidine catalyzed Knoevenagel condensation of ring-substituted benzaldehydes and malononitrile, and characterized by CHN elemental analysis, IR, 1 H-and 13 C-NMR. Novel copolymers of the ethylenes and vinyl acetate were prepared at equimolar monomer feed composition by solution copolymerization in the presence of a radical initiator (ABCN) at 708C. The composition of the copolymers was calculated from nitrogen analysis, and the structures were analyzed by IR, 1 H and 13 C-NMR, GPC, DSC, and TGA. High T g of the copolymers, in comparison with that of polyvinyl acetate, indicates a substantial decrease in chain mobility of the copolymer due to the high dipolar character of the trisubstituted ethylene monomer unit. The gravimetric analysis indicated that the copolymers decompose in the 220-8008C range.

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Copolymerization of Benzylidene malononitrile with methyl methacrylate and spectroscopic studies before and after irradiation with gamma rays of the obtained copolymer

Cited by 36 publications

References 0 publications

Salen Transition Metal Complexes as Catalysts for the Synthesis of Photostable Poly(methylmethacrylate)

Salen Transition Metal Complexes as Catalysts for the Synthesis of Photostable Poly(methylmethacrylate)

Novel Copolymers of Vinyl Acetate and Halogen Ring‐Disubstituted 2‐Phenyl‐1,1‐dicyanoethylenes

Novel Copolymers of Vinyl Acetate and Halogen Ring‐Substituted 2‐Phenyl‐1,1‐dicyanoethylenes

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