Reaction of crosslinked chloromethylated polystyrene with 4-hydroxybenzaldehyde under phase transfer-catalyzed conditions

Sarhan, Amr; Abdelaal, Magdy Y.; Ali, M. M.; Abdel-Latiff, E.H.

doi:10.1016/s0032-3861(98)00223-7

Cited by 14 publications

(10 citation statements)

References 27 publications

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“…As mentioned above, modification of P1 with heterocyclic amines led to copolymers with two different structural units. It is worthy to mention that the presence of signals at δ 43.58 corresponding to the chloromethyl group (c) in the 13 C NMR spectra of P2-P4 strongly supports the conclusion of incomplete modification of P1 with amines (2)(3)(4). This can be supported further by elemental analysis data and the calculations of the reaction yield mentioned below.…”

Section: Methodssupporting

confidence: 62%

“…The obtained polymer was purified twice by a dissolution/precipitation technique using THF as solvent and methanol as a precipitant and finally dried under vacuum at 50 ℃ for 24 h. The investigated heterocyclic amines were morpholine (2), piperidine (3) and pyrrolidine (4). NMR spectra of P2-P4 are shown in Figures 2-4.…”

Section: General Procedures For Functionalization Of P1mentioning

confidence: 99%

“…[1][2][3] Poly(epichlorohydrin) (PECH) is an interesting commercially available polymer due to the presence of labile chlorines on the polymer backbone. This facilitates the nucleophilic substitution for side chain modification, and the absence of phenyl groups would have stiffened the polymer chains in the case of styrene polymers [4][5][6] in addition to the presence of a flexible backbone. [7][8][9][10][11] Much attention has been paid to the modification of PECH with a large number of nucleophiles such as azides, 12 carbazole, 13 carboxylates, 14,15 sulphur compounds 12,[16][17][18] and phenolates [19][20][21] either under conventional conditions or under phase transfer catalysis (PTC) conditions.…”

Section: Introductionmentioning

confidence: 99%

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Chemical Modification of Poly(epichlorohydrin) Using Montmorillonite Clay

Bekkar

Belbachir

2009

Chin. J. Chem.

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Cationic ring opening polymerization of epichlorohydrin (1) and acetic anhydride in the presence of Maghnite-H (Mag-H ＋ ) as a catalyst afforded, ω-diacetylated poly(epichlorohydrin) (P1) in a moderate yield and molecular weight without formation of side products and degradation. P1 was chemically modified with morpholine (2), piperidine (3) and pyrrolidine (4) into the corresponding new functional poly(epichlorohydrin)s (P2-P4) in a moderate reaction conversion . The conversion of P1 into P2-P4 was confirmed by using FTIR and NMR spectroscopy and the yield was calculated from the elemental analysis data according to the mole fraction concept. The obtained functional polymers were further characterized by thermal analysis which showed a substantial increase of the glass transition temperature (T g ). Thus, the chemical modification of α,ω-acetylated PECH using Mag-H ＋ offers a simple method for obtaining functional polymers. Mag-H ＋ is a montmorillonite sheet silicate clay exchanged with proton.

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Section: Methodssupporting

confidence: 62%

Section: General Procedures For Functionalization Of P1mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Chemical Modification of Poly(epichlorohydrin) Using Montmorillonite Clay

Bekkar

Belbachir

2009

Chin. J. Chem.

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“…On prolonging the reaction time, the less accessible sites will be involved also, and diffusional limitations significantly affect the overall reaction rate. So the overall reaction rate decrease as the DD increases [29].…”

Section: Effect Of the Reaction Timementioning

confidence: 96%

Phase transfer catalyzed heterogeneous N-deacetylation of chitin in alkaline solution

Sarhan

Ayad

Badawy

et al. 2009

Reactive and Functional Polymers

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“…[20]. FT-IR spectroscopy was employed to evaluate the process of polystyrene nitration and amination [21]. The results showed that the optimum time for the nitration of polystyrene was ∼1 h and that for amination of polystyrene ∼2 h.…”

Section: Adsorbents Preparationmentioning

confidence: 99%