Investigation of the charge transfer complexes between N‐aryl maleimides and styrene. II

Mohamed, A. A.

doi:10.1002/actp.1986.010370812

Acta Polymerica

1986

DOI: 10.1002/actp.1986.010370812

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Investigation of the charge transfer complexes between N‐aryl maleimides and styrene. II

A. A. Mohamed¹

Abstract: The interaction between some N‐substituted maleimides and styrene in chloroform and acetone is studied by the 1H‐NMR technique. The strength of the complex formed in chloroform depends on the used maleimide, while in acetone no considerable chemical shift is observed. The stability of the complexes is explained on the basis of the steric effects arising between the interaction species, as well as the dielectric constant of the solvents.

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Cited by 8 publications

References 16 publications

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Copolymerization of maleic anhydride, N‐2‐chlorophenyl maleimide and N‐α‐naphthyl maleimide with styrene

1988

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The copolymerization of maleic anhydride (MA), N‐2‐chlorophenyl maleimide (2‐CMI) and N‐α‐naphthyl maleimide (α‐NMI) with styrene (ST) initiated by α‐radiation has been studied. The initial rate of copolymerization depends on the total concentration of the comonomers, and the rate decreases in the series ST/MA > ST/α‐NMI > ST/2‐CMI. The maximum rate occurred at a ratio for which [M2] > [ST]. The rate of formation and the reaction of m 1˙ is greater than m 2˙. The monomer reactivity ratios indicate that the ratio of alternating units decreases in the order ST/MA > ST/α‐NMI > ST/2‐CMI.

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Copolymerization of maleic anhydride, N‐2‐chlorophenyl maleimide and N‐α‐naphthyl maleimide with styrene

1988

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The molecular interaction of N‐chlorophenyl maleimides with styrene and methyl methacrylate

Mohamed

Ahmed

1991

Acta Polymerica

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Acta Polymericr 42 (1W1) Nr. 5 210 MOHAMED ;itid AHMED: Tha molecular int.eract.ion of N-cliloroplienyl ninleimiilcs with styrcne and nict.liyl rnetliacryla tcThe molecular interactions of N-2-, N-3-, and N-4-chlorophenyl maleimidus with styrcne and mcthyl niethacrylate, respectively, were investigated by 1H-NMR spectroscopy. A considerable upfield shift in the maleimide-styrene systems and a small downfield shift in the maleimide-methyl methacrylate systems are found. The results are discussed with respect to the stability of the monomer complexes. Die mvlekularen VVechselwirkungen vvn N-Chlvrphenylmaleinirniden mil Styren und Melhylrnethacnjlal Die molekularen Ivechselwirkungen von N-2-, N-3-sowie N-4-Chlorphenylmaleinimiden mit Styren beziehungsweiseMethylmethacrylat wurden mit der 'H-NMR-Spektroskopie untersucht. Bei den Maleinimid-Styren-Systemen wurde eine betrachtliche Verschiebung zu hoherem Feld und bei den Maleinimid-Mcthylmethacrylat-Systemen eine geringe Verscliiebung zu niedrigerem Feld gefunden. Die Ergebnisse werden hinsiclitlich der Stabilittit der Monomerkomplese diskuticrt.

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Copolymerization of N‐phenyl maleimide with methyl acrylate, ethyl acrylate, methyl methacrylate, and butyl methacrylate

Mohamed

Hasan

1991

Acta Polymerica

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N-phenyl maleimide (NPMI) was copolymerized with methyl acrylate (MA), ethyl acrylate (EA), methyl methacrylate (MMA), and butyl methacrylate (BMA). The composition diagrams for the copolymerization were determined. An azeotropic monomer composition was found in the range 0.55 to 0.65 of the acrylate feed ratio for the systems MA, EA, and MMA with NPMI with a maximum initial rate ofcopolymerization at 10 mole-% acrylate, whereas neither an azeotropic composition nor a maximum rate was found with the system BMA-NPMI. High concentration of maleimide in the monomer feed affects the intrinsic viscosity negatively. Degradative chain transfer to maleimide is assumed to cause the decrease in molecular weight. Copolymerisation von N-Phenylmaleinimid mit Methylacrylat, Ethylacrylat. Methylmethacrylat und ButylmethacrylatN-Phenylmaleinimid (NPMI) wurde mit Methylacrylat (MA), Ethylacrylat (EA), Methylmethacrylat (MMA) und Butylmethacrylat (BMA) copolymerisiert. Die Zusammensetzungsdiagramme der Copolymerisation wurden bestimmt. Fur die Systeme MA, EA und MMA mit NPMI wurden eine azeotrope Monomerzusammensetzung bei einem Acrylatanteil von 0.55 bis 0.65 in der Ausgangsmischung sowie eine maximale Anfangsgeschwindigkeit der Copolymerisation bei 10 Mol-Yo Acrylat gefunden. Dagegen traten beirn System BMA-NPMI weder eine azeotrope Zusammensetzung noch ein Geschwindigkeitsmaximum auf. Eine hohe Maleinimidkonzentration in der Ausgangsmischung beeinfluI3t die Grenzviskositiit negativ. ES wird angenommen, daD die Kettenubertragung zum Maleinimid die Abnahme der Molekiilmasse verursacht.

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Investigation of the charge transfer complexes between N‐aryl maleimides and styrene. II

Cited by 8 publications

References 16 publications

Copolymerization of maleic anhydride, N‐2‐chlorophenyl maleimide and N‐α‐naphthyl maleimide with styrene

Copolymerization of maleic anhydride, N‐2‐chlorophenyl maleimide and N‐α‐naphthyl maleimide with styrene

The molecular interaction of N‐chlorophenyl maleimides with styrene and methyl methacrylate

Copolymerization of N‐phenyl maleimide with methyl acrylate, ethyl acrylate, methyl methacrylate, and butyl methacrylate

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