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

Mohamed, A. A.; Al‐Yamor, K. Y.; Ahmed, Khaleel

doi:10.1002/actp.1988.010390708

Cited by 7 publications

(3 citation statements)

References 20 publications

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“…Among several different reaction pathways that have been developed for polyhydrazide synthesis, 1–6 low‐temperature polycondensation by the reaction of diacyl chloride with dihydrazide is the most popular method. The polyhydrazides were synthesized through reaction of dihydrazide with diacyl chloride by low‐temperature solution polymerization in dry NMP containing 5% LiCl (Scheme ).…”

Section: Resultsmentioning

confidence: 99%

“…Polyhydrazide materials are of great interest, because they enhance dyeability of synthetic fibers, improve elasticity over other polymer types, and their use in reverse osmosis separations. 1, 2 The polyhydrazides are high performance materials that have ability to spin to high modulus fibers and could be used as a reinforced plastics and tire cords. 3 In particular, they are soluble polymers with potential to convert to other highly thermally stable polymers like polyoxadizoles and polytriazoles.…”

Section: Introductionmentioning

confidence: 99%

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Noncoplanar rigid‐rod aromatic polyhydrazides containing Tröger's base

Abdolmaleki¹,

Heshmat-Azad²,

Kheradmand-fard³

2011

J of Applied Polymer Sci

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A new Trö ger's base-containing aromatic dihydrazide, 2,8-bis(carboxylic)-6H, 12H-5,11-methanodibenzo-[b,f] [1,5]-diazocine dihydrazide, was prepared by the condensation of ethyl p-aminobenzoate with hexamethylenetetramine in the presence of trifluoroacetic acid, followed by converting to the dihydrazide with a high yield and high purity. A series of novel aromatic polyhydrazides were prepared from the Trö ger's unit containing dihydrazide and various aromatic diacyl chlorides via low-temperature solution polycondensation in quantitative yields. All the polyhydrazides were amorphous and readily soluble at room temperature in polar organic solvents such as N,N-dimethylacetamide and N-methyl-2-pyrrolidone. These polymers could be solution cast into transparent, tough, and flexible films with good mechanical properties. They had useful levels of thermal stability associated with good glass transition temperatures (163-172 C), 10% weight-loss temperatures in excess of 460 C, and char yields at 800 C in nitrogen higher than 39%.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Noncoplanar rigid‐rod aromatic polyhydrazides containing Tröger's base

Abdolmaleki¹,

Heshmat-Azad²,

Kheradmand-fard³

2011

J of Applied Polymer Sci

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“…These fibers can be successfully applied in fabrics, rigid composites, tire‐cords, impact‐absorbing devices, and for ballistic protection 20. Polyamide‐hydrazide films are useful as reverse osmosis membranes in water‐pollution control, and for concentration fruit juices,21 and as semipermeable membranes for desalination of artificial and natural seawater 16, 22–28. Further, their modified transition metal chelates have shown good electrical conductivity 29–32.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of novel wholly para‐oriented aromatic polyamide‐hydrazides containing sulfone‐ether linkages

Mohamed

Fahmy

2009

J of Applied Polymer Sci

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Four novel wholly para-oriented aromatic polyamide-hydrazides containing flexibilizing sulfone-ether linkages in their main chains have been synthesized from 4-amino-3-hydroxy benzhydrazide (4A3HBH) with either 4,4 0 -sulfonyldibenzoyl chloride (SDBC), 4,40 -(1,4-phenylenedioxy)dibenzoyl chloride (ODBC) via a low-temperature solution polycondensation reaction. A polyamide-hydrazide without the flexibilizing linkages is also investigated for comparison. It was synthesized from 4A3HBH and terephthaloyl chloride (TCl) by the same synthetic route. The intrinsic viscosities of the polymer ranged from 2.85 to 4.83 dL g À1 in N,N-dimethyl acetamide (DMAc) at 30 C and decreased with introducing the flexibilizing linkages into the polymer. All the polymers were soluble in DMAc, N,N-dimethyl formamide (DMF), and N-methyl-2-pyrrolidone (NMP), and their solutions could be cast into films with good mechanical strengths. Further, they exhibited a great affinity to water sorption. Their solubility and hydrophilicity increased remarkably by introducing the flexibilizing linkages. The polymers could be thermally cyclodehydrated into the corresponding poly(1,3,4-oxadiazolyl-benzoxazoles) approximately in the region of 295-470 C either in nitrogen or in air atmospheres. The flexibilizing linkages improve the solubility of the resulting poly(1,3,4-oxadiazolyl-benzoxazoles) when compared with poly(1,3,4-oxadiazolyl-benzoxazoles) free from these linkages.

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

Cited by 7 publications

References 20 publications

Noncoplanar rigid‐rod aromatic polyhydrazides containing Tröger's base

Noncoplanar rigid‐rod aromatic polyhydrazides containing Tröger's base

Synthesis and characterization of novel wholly para‐oriented aromatic polyamide‐hydrazides containing sulfone‐ether linkages

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

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