Studies on graft copolymers of methyl methacrylote with cellulose using pentavalent vanadium compounds

Singh, Harcharan; Thampy, R. T.; Chipalkatti, V.B.

doi:10.1002/pol.1965.100030332

Cited by 14 publications

(2 citation statements)

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“…(8)- (11): (8) (9) (10) Indication of this is that the rate of termination of the homopolymer was not affected by excess Vv in the system, as was the case with grafting. This suggests that above an optimal concentration of Vv, the onset of the gel effectlOJ1 [brought about by dissolution of poly(methy1 methacrylate) in its own monomer] on decreasing the rate of termination is more pronounced with the homopolymer than with the graft.…”

Section: Concentration Of Pentavalent Vanadium Ion (V")mentioning

confidence: 93%

“…Indeed, a graft yield of 37.33% on cellulose pulp could be obtained when the latter was grafted with methyl methacrylate using vanadium pentanitrate as initiator. 8 This work was undertaken with a view of studying the feasibility of grafting of cotton with methyl methacrylate using pentavalent vanadium as initiator. For this purpose, the graft polymerization reaction was carried out under different conditions, including initiator and monomer concentration, time and temperature of the reaction, type of acids, as well as incorporation of isopropyl alcohol in the polymerization system.…”

Section: Introductionmentioning

confidence: 99%

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Pentavalent vanadium ion-induced grafting of methyl methacrylate onto cotton cellulose

Khalil

El‐Rafie

Hebeish

1981

J. Appl. Polym. Sci.

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SynopsisGraft polymerization of methyl methacrylate (MMA) onto cotton cellulose using vanadium pentanitrate as initiator was studied under a variety of conditions. The graft yield increased with increasing initiator concentration up to 8 mmoleA. and then decreased upon further increase in initiator concentration. Increasing MMA concentration from 1 to 5% was accompanied by a significant increase in the degree of grafting. The latter was also affected by the kind and concentration of the acid incorporated in the polymerization medium. Based on graft yields, the efficiency of the acids follows the order HzS04 > HN03 > HC101. Replacement of the acid with isopropyl alcohol was also examined. An isopropyl alcohol concentration of 10% constitutes the optimal concentration for grafting, Maximum graft yield depends upon the polymerization temperature; it follows the order 5OoC 2 6OoC > 40°C > 3OoC > 70°C. Reaction mechanisms for grafting in the presence of acid as well as in the presence of isopropyl alcohol are proposed.

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Section: Concentration Of Pentavalent Vanadium Ion (V")mentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Pentavalent vanadium ion-induced grafting of methyl methacrylate onto cotton cellulose

Khalil

El‐Rafie

Hebeish

1981

J. Appl. Polym. Sci.

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Grafting of vinyl monomers onto nylon‐6. 1. Graft copolymerization of acrylamide onto nylon‐6 using trivalent manganese as initiator

Nayak

Samal

Nayak

1979

Angew. Makromol. Chem.

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The use of trivalent manganese to initiate graft-copolymerization of acrylamide onto nylon-6 has been investigated. The rate of grafting has been determined by varying monomer, manganese(III), temperature and solvent mixtures. The graft yield increases with increasing monomer concentration up to 0.8 M and with further increase of monomer concentration the graft yield decreases. The percentage of grafting increases with manganese (111) ion concentration up to 5.25 x 10-3M and thereafter it decreases. The rate of reaction depends on temperature. Among the solvent composition studied, a water/solvent mixture containing 25% of the solvent seems to constitute the most favourable medium for grafting and with further increase of solvent composition, the graft yield decreases.

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Graft polymerization of methyl methacrylate onto nylon 6 using pentavalent vanadium as initiator

Khalil¹,

Aggour²,

El‐Rafie³

et al. 1981

Angew. Makromol. Chem.

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Pentavalent vanadium ion (V')-induced graft polymerization of methyl methacrylate onto nylon 6 was investigated under a variety of conditions. Increasing the V'-concentration up to 2 mmol/l was accompanied by an enhancement in grafting; the latter was not affected by further increase in Vv-concentration. Unlike grafting, the homopolymer and total conversion tended to increase by increasing Vv concentration. The graft yield enhanced significantly when the MMA-concentration was increased up to 3%; further increase in MMA-concentration had no effect on grafting. Raising the polymerization temperature from 50" up to 70°C caused a significant increase in the rates of grafting, homopolymerization and total conversion. Using a solvent-water mixture as medium for polymerization affected considerably the magnitude of grafting. While using methyl alcohol, ethyl alcohol and acetone at any ratio in the solvent-water mixture resulted in decreased grafting, using an isopropyl alcohol-water mixture up to a ratio of 25 : 75 gave rise to increased grafting. ZUSAMMENFASSUNG:Es wurde die durch Swertiges Vanadium induzierte Pfropfcopolymerisation von Methylmethacrylat auf Nylon 6 untersucht. Die Pfropfausbeute sowie der Gesamtumsatz wurden in Abhangigkeit von der Vanadiumkonzentration, des Losungsmittelgemisches sowie der Reaktionstemperatur bestimmt.

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Studies on graft copolymers of methyl methacrylote with cellulose using pentavalent vanadium compounds

Cited by 14 publications

References 0 publications

Pentavalent vanadium ion-induced grafting of methyl methacrylate onto cotton cellulose

Pentavalent vanadium ion-induced grafting of methyl methacrylate onto cotton cellulose

Grafting of vinyl monomers onto nylon‐6. 1. Graft copolymerization of acrylamide onto nylon‐6 using trivalent manganese as initiator

Graft polymerization of methyl methacrylate onto nylon 6 using pentavalent vanadium as initiator

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