Grafting vinyl monomers onto silk fibers IV. Graft copolymerization of methyl methacrylate onto silk using bromate‐thiourea redox system

Nayak, Padma L.; Lenka, Subasini; Pati, Nrusingha C.

doi:10.1002/apmc.1980.050850103

Cited by 22 publications

(7 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The decrease in grafting parameters might be due to interaction of bromate ion with guar gum macro radicals or with growing grafted chain radicals, lowering the grafting parameters or by termination between growing grafted chains. A similar observation has been made by other workers [15]. This Table 1.…”

Section: Effect Of Bromate Ion Concentrationsupporting

confidence: 86%

Graft co-polymerization of 2-acrylamido-2-methyl-1-propane sulphonic acid onto guar gum by the bromate/mandelic acid redox pair

Pandey¹,

Srivastava²,

Behari³

2006

Designed Monomers and Polymers

View full text Add to dashboard Cite

Guar gum has been modified by grafting 2-acrylamido-2-methyl-1-propane sulphonic acid (AMPS) onto guar gum in aqueous medium. The graft co-polymerization reaction was studied under different experimental conditions, such as varying monomer concentration, redox pair concentration, backbone concentration, hydrogen ion concentration, time of reaction and temperature. It has been observed that grafting ratio, add on, conversion and rate of grafting decrease on increasing the bromate ion concentration. A similar trend has been observed with hydrogen ion concentration. The grafting ratio, add on, conversion and rate of grafting have been found to increase with mandelic acid concentration. On increasing the AMPS concentration in the concentration range 2.0 × 10 −2 to 8.0 × 10 −2 mol dm −3 , the grafting parameters show increasing trend. However, increase in guar gum concentration decrease the grafting ratio, add on and rate of grafting while conversion increases with increase in guar gum concentration. All the grafting parameters show increasing trend with time and the optimum temperature has been observed as 35 • C. The graft co-polymer has been characterized by infrared spectroscopy and thermogravimetric analysis.

show abstract

Section: Effect Of Bromate Ion Concentrationsupporting

confidence: 86%

Graft co-polymerization of 2-acrylamido-2-methyl-1-propane sulphonic acid onto guar gum by the bromate/mandelic acid redox pair

Pandey¹,

Srivastava²,

Behari³

2006

Designed Monomers and Polymers

View full text Add to dashboard Cite

show abstract

“…McCormick et al reported on the ring-opening pathways of ε-caprolactone with cellulose using a LiCl/DMAc solvent system with triethylamine as catalyst. In their investigation, ring opening occurred through acyl-oxygen cleavage producing a cellulose ester. − …”

Section: Introductionmentioning

confidence: 99%

Acylation of Pullulan by Ring-Opening of Lactones

Donabedian

McCarthy

1998

Macromolecules

View full text Add to dashboard Cite

In this paper, we report on the production of modified pullulan derivatives that have been produced in solution by ring-opening ε-caprolactone and [l]-lactide using a tin octanoate [Sn(Oct)2] catalyst system in DMSO. These derivatives designated as hexanoates (1 and 2) and dilactates (4−7) have been characterized and have varying degrees of substitution (DS). 1 and 2 were characterized by interesting thermal properties as well as crystalline morphology. From DSC analysis, 2, unlike the parent polysaccharide, appears to melt at 114 °C. The crystalline morphology of this polymer was characterized by X-ray powder diffraction and d spacings were calculated. This pullulan derivative possessed new crystallographic reflections not seen in either pullulan or poly (ε-caprolactone). The pullulan-6 dilactate samples (4−7), produced had DS values ranging from 0.1 to 0.75. Depending upon the DS, these samples were soluble in a wide range of organic solvents including acetone and methanol. Although these materials did not exhibit any observable melting transitions from inspection of DSC, glass transition temperatures were detected for 5 [DS = 0.21], 6 [DS = 0.44], and 7 [DS = 0.80], at 130, 120, and 90 °C, respectively. As confirmed by 13C NMR, the ring-opening process for all of these pullulan derivatives appears to be taking place through an acyl−oxygen cleavage, producing an ester linkage to the backbone with a hydroxy terminus.

show abstract

“…The graft copolymer has been characterized according to Fanta's definition,23 and the rate of grafting24, 25 has also been calculated: The effects of variations in the concentration of Fe 2+ , BrO

_{3}^{−}

, hydrogen ion, carboxymethylcellulose, and acrylamide along with the effects of time and temperature on the grafting parameters have been studied.…”

Section: Resultsmentioning

confidence: 99%

One‐pot synthesis of a polysaccharide‐based graft copolymer with an efficient redox pair (Fe²⁺/BrO₃⁻)

Kumar

Srivastava

Behari

2007

J of Applied Polymer Sci

View full text Add to dashboard Cite

A graft copolymer based on a polysaccharide (sodium salt of carboxymethylcellulose) and a vinyl monomer (acrylamide) has been synthesized in a nitrogen atmosphere, and its reaction conditions have been optimized for a better yield with ferrous sulfate and potassium bromate as a redox initiator. The effects of ferrous ion, bromate ion, hydrogen ion, sodium carboxymethylcellulose, and acrylamide along with the reaction time and temperature have been studied through the determination of the grafting parameters: the grafting ratio, add‐on, conversion, efficiency, homopolymer, and rate of grafting. The maximum yield has been found to occur when the acrylamide concentration is 8.0 × 10−2 mol/dm3, whereas the maximum conversion occurs at a minimum concentration of acrylamide, that is, at 3.0 × 10−2 mol/dm3. The grafting parameters have been found to increase with an increasing concentration of the redox initiator (Fe2+, from 2.0 × 10−3 to 10.0 × 10−3 mol/dm3; BrO 3−, from 2.2 × 10−3 to 4.0 × 10−3 mol/dm3). The maximum efficiency occurs with a reaction time of 210 min. The rate of grafting has been found to be maximum up to 60 min; after that, it decreases rapidly. In this article, it is shown that the hydrogen ion leads to a very clear decrease in the grafting parameters as its concentration increases from 2.1 × 10−3 to 11.3 × 10−3 mol/dm3. Grafted gum and ungrafted gum have been characterized with Fourier transform infrared spectroscopy and thermogravimetric analysis. A probable mechanism has been suggested for graft copolymerization. It has been observed that the graft copolymer is thermally more stable than the parent backbone. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2008

show abstract

Grafting vinyl monomers onto silk fibers IV. Graft copolymerization of methyl methacrylate onto silk using bromate‐thiourea redox system

Cited by 22 publications

References 27 publications

Graft co-polymerization of 2-acrylamido-2-methyl-1-propane sulphonic acid onto guar gum by the bromate/mandelic acid redox pair

Graft co-polymerization of 2-acrylamido-2-methyl-1-propane sulphonic acid onto guar gum by the bromate/mandelic acid redox pair

Acylation of Pullulan by Ring-Opening of Lactones

One‐pot synthesis of a polysaccharide‐based graft copolymer with an efficient redox pair (Fe²⁺/BrO₃⁻)

Contact Info

Product

Resources

About

Grafting vinyl monomers onto silk fibers IV. Graft copolymerization of methyl methacrylate onto silk using bromate‐thiourea redox system

Cited by 22 publications

References 27 publications

Graft co-polymerization of 2-acrylamido-2-methyl-1-propane sulphonic acid onto guar gum by the bromate/mandelic acid redox pair

Graft co-polymerization of 2-acrylamido-2-methyl-1-propane sulphonic acid onto guar gum by the bromate/mandelic acid redox pair

Acylation of Pullulan by Ring-Opening of Lactones

One‐pot synthesis of a polysaccharide‐based graft copolymer with an efficient redox pair (Fe2+/BrO3−)

Contact Info

Product

Resources

About

One‐pot synthesis of a polysaccharide‐based graft copolymer with an efficient redox pair (Fe²⁺/BrO₃⁻)