Preparation and properties of poly(N-ethylmethacrylamide) networks

Ulbrich, Karel; Ilavský, M.; Dušek, Karel; Kopeček, Jindřich

doi:10.1016/0014-3057(77)90184-7

Cited by 24 publications

(13 citation statements)

References 16 publications

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“…Values of s are presented in Table 1, showing the very low crosslinking efficiency of BA over the whole range of crosslinker ratios. Poly(N-ethylacrylamide) and poly(N-butylacrylamide) with BA-like crosslinking agent [17,18], show the same trend and the same order of magnitude for IX�? as those presented in this work.…”

Section: Calculation Of the Conversion At The Gel Pointmentioning

confidence: 77%

“…The gel point was determined by the standard gas bubble method (17)(18)(19). Other viscometric techniques must be discarded since it has been found (20,21] that they can significantly affect the rate of gelation and the structure of the fi nal network.…”

Section: Gel Point Conversionmentioning

confidence: 99%

“…According to the theory of branching processes, the critical conversion of vinyls at the gel point, ( oc O )'h, is given by the following expression [ 17):…”

Section: Calculation Of the Conversion At The Gel Pointmentioning

confidence: 99%

“…forros an intermolecular crosslink [17]. The ratio s = (1Xo)'h/(1Xo)°'P may therefore be used as an estimation of the fraction of inter molecular crosslinks in the real network [22].…”

Section: Calculation Of the Conversion At The Gel Pointmentioning

confidence: 99%

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Network defects in polyacrylamide gels

Baselga

Llorente

Hernández-Fuentes

et al. 1989

European Polymer Journal

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The weight conversion at the gel point (oc 0 ) was determined by the gas bubble method in two sets of polyacrylamide (PAA) gels crosslinked with' N,N'-methylene-bisacrylamide (BA). oc 0 remained practically constant when the crosslinker ratio was C = 10% (w/w) and the total concentration of comonomers in the feed ranged from C T = 5 to 10 g/100 mi. When C T was kept constant at 5 g/100 mi and C changed from O to 25% (w/w), oc 0 showed a minimum at C = 7%. By comparing the experimental values of oc 0 with those calculated for an ideal network, it was concluded that the crosslinking efficiency of BA is very low. The dependence on C of oc 0 and other properties like the elastic phantom modulus, 1/ ;h l, and the polymer volume fraction at swelling equilibrium, v 2 ,, was explained in terms of the formation of network defects: the formation of BA sequences longer than unity and that of intramolecular cycles both have an increasing contribution at C > 7% but can be neglected at lower values of C.

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Section: Calculation Of the Conversion At The Gel Pointmentioning

confidence: 77%

Section: Gel Point Conversionmentioning

confidence: 99%

“…According to the theory of branching processes, the critical conversion of vinyls at the gel point, ( oc O )'h, is given by the following expression [ 17):…”

Section: Calculation Of the Conversion At The Gel Pointmentioning

confidence: 99%

“…forros an intermolecular crosslink [17]. The ratio s = (1Xo)'h/(1Xo)°'P may therefore be used as an estimation of the fraction of inter molecular crosslinks in the real network [22].…”

Section: Calculation Of the Conversion At The Gel Pointmentioning

confidence: 99%

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Network defects in polyacrylamide gels

Baselga

Llorente

Hernández-Fuentes

et al. 1989

European Polymer Journal

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“…The modified polymer (P1) was filtered, washed with redistilled water, methanol, ether and dried under vacuum. (0.00057 mole, 0.2g) of 1-((4-(5-mercapto-4H-1,2,4-triazol-3-yl)phenyl)diazenyl)naphthalen-2-ol [N1] was added to (0.1g) of poly (vinyl chloride) and (3) drops of pyridine in (15) ml THF, which reflux for 5 h, the solvent was evaporate and the orange solid product was obtain 18 . Schematic description for polymer synthesis is shown in Figure. …”

Section: Synthesis Of Triazole-pvc Polymermentioning

confidence: 99%

Removal Bismarck Brown G dye from Aqueous Solution Over a Composite of Triazole-Polyvinyl Chloride Polymer and Zinc Oxide

Alrazzak¹,

Aowda²,

Atiyah³

2017

Orient. J. Chem

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The present study involves synthesis a composite of triazole-poly vinyl chloride (PVC) polymer with nano-crystalline zinc oxide to yield triazole-PVC/ZnO. The produced composite was characterized using fouier infrared spectroscopy (FTIR), X-Rays diffraction (XRD) and micro-elemental analysis (CHN). The activity of the produced composite with respect to neat zinc oxide was investigated by following both of adsorption and photocatalytic removal of Bismarck Brown G (BBG)dye from their aqueous solutions. The obtained results in this study showed that triazole-PVC/ZnO was more efficient than neat ZnO on dye removal for both of adsorption and photocatalytic reaction.

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Polymerization Processes

Hamielec

Tobita

2000

Ullmann's Encyclopedia of Industrial Chemistry

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Preparation and properties of poly(N-ethylmethacrylamide) networks

Cited by 24 publications

References 16 publications

Network defects in polyacrylamide gels

Network defects in polyacrylamide gels

Removal Bismarck Brown G dye from Aqueous Solution Over a Composite of Triazole-Polyvinyl Chloride Polymer and Zinc Oxide

Polymerization Processes

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