Grafting vinyl monomers onto silk fibers. VIII. Graft copolymerization of methyl methacrylate onto silk using tetravalent manganese–oxalic acid redox system

Panda, G.; Pati, Nrusingha C.; Nayak, Padma L.

doi:10.1002/app.1980.070250721

Cited by 12 publications

(2 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The initiation of graft copolymerization of vinyl monomers onto cellulosic and non‐cellulosic materials by potassium permanganate has been reported 1–4. Combined with readily oxidizable organic compounds, potassium permanganate can also form effective redox systems capable of initiating the graft copolymerization of vinyl monomers onto polymeric substrates 5–10…”

Section: Introductionmentioning

confidence: 99%

“…[1][2][3][4] Combined with readily oxidizable organic compounds, potassium permanganate can also form effective redox systems capable of initiating the graft copolymerization of vinyl monomers onto polymeric substrates. [5][6][7][8][9][10] For p-xylene in redox combination with ceric ion, the initiation of graft copolymerization of vinyl monomers onto cellulosic substrates was characterized by minimum and maximum graft yields.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Graft copolymerization of acrylic acid onto methylcellulose by potassium permanganate‐p‐xylene redox pair

Eromosele

Nwokata

2003

J of Applied Polymer Sci

View full text Add to dashboard Cite

Poly(acrylic acid) was grafted onto methylcellulose in aqueous media by a potassium permanganatep-xylene redox pair. Within the concentration range from 0.93 ϫ 10 Ϫ3 to 9.33 ϫ 10 Ϫ3 M, p-xylene, the graft copolymerization reaction exhibited minimum and maximum graft yields and was associated with two precursor-initiating species, a p-xylyl radical and its diradical derivative. The efficiency of the graft was low, not higher than 12.9% at a p-xylene concentration of 0.93 ϫ 10 Ϫ3 M and suggested the dominance of a competitive homopolymerization reaction under homogeneous conditions. The effect of permanganate on the graft yield was normal and optimal at 135% graft yield, corresponding to a concentration of the latter of 33.3 ϫ 10 Ϫ3 M over the range from 8.3 ϫ 10 Ϫ3 to 66.7 ϫ 10 Ϫ3 M. The conversion in graft yield showed a negative dependence on temperature in the range 30 -60°C and suggested a preponderance of high activation energy transfer reaction processes. The calculated composite activation energy for the graft copolymerization was 7.6 kcal/mol.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Graft copolymerization of acrylic acid onto methylcellulose by potassium permanganate‐p‐xylene redox pair

Eromosele

Nwokata

2003

J of Applied Polymer Sci

View full text Add to dashboard Cite

show abstract

Radiation induced grafting of methacrylic acid onto silk for the immobilization of antimicrobial drug for sustained delivery

Singh

Tyagi

1989

Angew. Makromol. Chem.

View full text Add to dashboard Cite

Medical grade black braided silk suture and pure mulberry silk twisted yarn were grafted with methacrylic acid (MAA) using %o gamma radiation. The effect of various synthesis conditions on the grafting was studied. The addition of methanol in water has a marked effect on the degree of grafting, maximum yield of grafting was obtained in an equivolume mixture of water-methanol. The percent grafting increased with the increase in the monomer concentration and in total radiation. For a constant total dose, grafting was found to be higher at lower dose rates. The order of the dependence of the rate of grafting on the dose rate was found to be 0.53 and 0.56 for medical grade black braided silk suture samples and mulberry silk twisted yarn samples, respectively. The immobilization of an antimicrobial drug, 8-hydroxy quinoline (8-HQ) hydrochloride on the grafted pure silk for sustained delivery, its release in vitro and its antimicrobial activity were also studied. The percentage of 8-HQ immobilized onto various grafted silk samples increased with the increase in the degree of grafting. The release of the drug in distilled water was sustained for 32 days. 8-HQ was found to be active against both Gram-positive and Gram-negative bacteria. ZUSAMMENFASSUNG: Ein medizinischer, schwarzer geflochtener Seidenfaden und ein reiner Maulbeerseidenzwirn wurden mit Methacrylsaure (MAA) unter Verwendung von Wo-Gammastrahlung gepfropft. Der Einflufi verschiedener Synthesebedingungen auf die Pfropfung wurde untersucht. Die Zugabe von Methanol in Wasser beeinflufit den Pfropfgrad, die maximale Pfropfausbeute wurde in einer Mischung aus gleichen Volumina Wasser und Methanol erhalten. Der Pfropfgrad nahm mit Zunahme der Monomerkonzentration und der Gesamtstrahlungsdosis zu. Bei einer konstanten Gesamtdosis war die Pfropfausbeute bei niedrigeren Dosisleistungen htiher. Die Ordnung der Abhtingigkeit der Pfropfgeschwindigkeit von der Dosisleistung wurde zu 0,53 fur den medizinischen Seidenfaden und zu 0,56 fur Maulbeerseidenzwirn bestimmt . Die Immobilisierung eines antimikrobiellen Armeimittels, 8-Hydroxychinolin-hydrochlorid (8-HQ -HC1) auf gepfropfte reine Seide zur dauerhaften Abgabe, seine in-vitro Freisetzung und seine antimikrobielle Aktivitiit wurden auch untersucht . DerProzentsatz von 8-HQ, das auf verschiedenen gepfropften Seidenproben immobilisiert war, nahm mit der ErhOhung des Pfropfgrades zu. Die Freisetzung des Arzneimittels in destilliertem Wasser wurde 32 Tage lang aufrecht erhalten 8-HQ war sowohl gegen Gram-positive als auch Gram-negative Bakterien wirksam.

show abstract

Graft copolymerization of methylmethacrylate onto caesarweed fibers by the potassium permanganate–toluene redox system

Eromosele

Hamagadu

1993

J of Applied Polymer Sci

View full text Add to dashboard Cite

SYNOPSISPreliminary investigations have been conducted on the graft copolymerization of methylmethacrylate onto Caesarweed fiber, initiated by potassium permanganate and the toluene redox system. The percentage graft yield increased with permanganate up to 132% in the concentration range, 1.0 X lo-* to 5.0 X lo-' M at 4OoC. The effects of varying concentrations of toluene, acids, and monomer on graft yield were also investigated. Graft yield increased initially and then decreased on varying the concentrations of toluene from 2 X lo-' to 20 X lo-* M. The graft yield increased with temperature between 20 and 5OOC.At 60°C, the graft yield decreased considerably by up to 60% of the value at 50°C. The calculated activation energies for the overall reaction, and for the initiation process, are 9.15 and 9.30 Kcal mol-' , respectively. 0 1993 John Wiley & Sons, Inc. I NTRO DUCT10 NGrafting of synthetic polymers onto cellulosic and protein fibers has received considerable attention because, in some cases, grafting yields copolymers with improved physicochemical properties with industrial and commercial value. Specifically, grafting of acrylonitrile onto jute fibers13 resulted in the fibers' improved extensibility and light fastness. Similarly, grafting of methylmethacrylate onto jute fibers l4 yielded a copolymer with an enhanced thermal property. However, for cellulosic fibers, different morphological features of the polymer matrices are known to account for varying grafting characterist i c~. '~,~~ Caesarweed, Urenu lobatu I, is of the mallow family, Malvacea, which is one of the most important of all fiber plant families. The plant is cultivated in warm regions of several countries, including West Africa, and it often grows wild in abundance. The bast fibers are cellulosic materials, closely resembling jute, but somewhat shorter and coarser. The * To whom correspondence should be addressed. fibers are used as substitutes for jute and find local application in the production of twines and sacks. Information about the chemical composition and morphological properties of the fibers is sparse; neither is there any report on the grafting of synthetic polymer onto the fibers. This article presents the results of a preliminary study of the graft copolymerization of methylmethacrylate ( MMA) onto Caesarweed fibers, initiated by acidified potassium permanganate and the toluene redox system. EXPERIMENTALToluene (BDH) was treated with sulfuric acid and was washed copiously with distilled water to neutral pH. It was dried over anhydrous calcium chloride and was fractionally distilled before use.Methylmethacrylate ( Aldrich Corp.) was washed with 5% aqueous sodium hydroxide and sodium chloride solutions, was dried over anhydrous calcium chloride, and was then fractionally distilled. The middle fraction of the monomer was collected and was stored under refrigerated conditions. All other reagents, that is, potassium permanganate, glacial acetic acid, and sulfuric acid (-18 645

show abstract

Grafting vinyl monomers onto silk fibers. VIII. Graft copolymerization of methyl methacrylate onto silk using tetravalent manganese–oxalic acid redox system

Cited by 12 publications

References 21 publications

Graft copolymerization of acrylic acid onto methylcellulose by potassium permanganate‐p‐xylene redox pair

Graft copolymerization of acrylic acid onto methylcellulose by potassium permanganate‐p‐xylene redox pair

Radiation induced grafting of methacrylic acid onto silk for the immobilization of antimicrobial drug for sustained delivery

Graft copolymerization of methylmethacrylate onto caesarweed fibers by the potassium permanganate–toluene redox system

Contact Info

Product

Resources

About