Graft copolymerization of acrylamide on cotton cellulose in a limited aqueous system following pretreatment technique

Ghosh, Premamoy; Dev, Debaprasad; Samanta, Amalendu

doi:10.1002/app.1995.070581010

Cited by 36 publications

(34 citation statements)

References 9 publications

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“…At a certain time point to, G' suddenly rises as a result of the cross-linking network structure forming. Gelation process always lasts for some time and to is referred as the critical sol-gel transition point which can be shown on the time course of storage modulus G' [19]. As being shown in figure 3 the gel forming time of PNIPA/silica composite hydrogels gradually increases along with the increasing content of silica.…”

Section: Structure Of Composite Hydrogelsmentioning

confidence: 95%

Effects of Silica Content on the Properties of Poly(N-isopropylacrylamide) / Silica Nanocomposite Hydrogels

Wu¹,

Zhang

Zhang³

2017

Proceedings of the 2017 6th International Conference on Energy, Environment and Sustainable Development (ICEESD 2017)

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Poly(N-isopropylacrylamide) is a representative thermosensitive polymer, whose hydrogels have broad applications. But poly(N-isopropylacrylamide) hydrogels are weak and brittle. To get higher strength hydrogels, in this paper, silica sol was utilized as nanoparticle reinforcer source to construct poly(N-isopropylacrylamide)/silica nanocomposite hydrogels by in situ polymerization. By means of scanning electron microscopy, nano-silica was found dispersed evenly on the surface of PNIPA polymer network. Encouragingly, the compression strength of composite hydrogels have been enhanced more than 60% owing to the introduction of nano-silica. Obviously, the more silica sol this composite hydrogels contain ,the longer gelation time they obtain. Compared to pure PNIPA hydrogels, nanocomposite hydrogels have faster deswelling speed at high temperature. And the lower critical solution temperature of nanocomposite hydrogels with different content of silica hydrogels was found between 33.5 o C to 34.5 o C. Because silica sol is facial to composite with hydrogel, this study provides a simple way for nanocomposite reinforced hydrogels preparation.

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Section: Structure Of Composite Hydrogelsmentioning

confidence: 95%

Effects of Silica Content on the Properties of Poly(N-isopropylacrylamide) / Silica Nanocomposite Hydrogels

Wu¹,

Zhang

Zhang³

2017

Proceedings of the 2017 6th International Conference on Energy, Environment and Sustainable Development (ICEESD 2017)

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“…For 10 g of fabric sample, 0.10 g of acid dye (for 1% shade depth) was taken in 200 ml (using material to liquor ratio i.e. MLR 1:20) aqueous solution of 5% Na 2 SO 4 and a requisite volume of 2% HCOOH solution was added to adjust pH to 4-4.5 and the dyeing was carried out following a standard method [12,13] using a laboratory beaker dyeing unit for 1 h at 90±5˚C. The dyed samples were then subjected to normal washing, soaping and further washing before drying.…”

Section: Methodsmentioning

confidence: 99%

Effects of Acid/Alkali and Cellulase Enriched Mixed Enzyme Treatments on Properties of Jute-Cotton Union Furnishing Fabric

Samanta¹

2017

JTEFT

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The effects of chemical pre-treatments using dilute acids [HCl, CH 3 COOH, HCOOH, (CH 2 COOH) 2 C(OH)COOH] and alkali (NaOH) on raw jute and jute-cotton(75:25) union fabric and the effects of specified mixed enzyme system (different proportion of mixture of cellulase, xylanase and pectinase) pretreatment on conventional 2% H 2 O 2 bleached jute-cotton union fabric have been comparatively evaluated. Among different organic/ mineral acid pretreatments 1% HCl treatment shows higher surface brightening action than that obtained by formic acid, acetic acid and citric acid pre-treatment. All these acid pretreatment do not show desirable softening action but show varying degree of surface leaching action associated with measurable changes in K/S value, whiteness, yellowness and brightness indices. However, 10-18 % NaOH pretreatment of raw jute-cotton union fabric show appreciable softening action but is associated with higher mass loss, appreciable reduction in tenacity and surface darkening. While, 5% dilute NaOH pretreatment show somewhat less softening action, but exhibit lower mass loss, lower surface darkening and lower reduction in tenacity which may be practically useful in imparting desirable softness in jute-cotton union fabric. Treatment with specified cellulase enriched mixed enzyme system (175 unit/ml of cellulase, 96 unit/ml of xylanase and 136 unit/ml of pectinase) on either 1 or 5% NaOH pretreated or conventional 2%H 2 O 2 bleached jute-cotton union fabric renders a moderate degree of softening action and surface smoothening with overall good balance in important textile related properties. However, higher degree of softening action may be achieved, if the said mixed enzyme treatment is carried out after both sequential pretreatments i.e. 5% NaOH pretreatment followed by conventional H 2 O 2 bleaching at the cost of higher weight loss and reduction in tenacity. Studies on Dyeability of such chemically treated jutecotton union fabric reveals that NaOH pretreatment show an increasing trend for acid dye uptake and reactive dye uptake, while all the dilute acid pretreatments show an increasing trend of basic dye uptake in general. .

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“…MLR 1:20) aqueous solution of 5% glauber salt and a requisite volume of 5% Alum was added to adjust pH to 4-4.5. The dyeing [7,28,29] was carried out for 1 h at 90°C (± 5 0 C), in Infra Colour Dyeing Machine (Make-RB Electronic Engg Pvt Ltd) after which the dyed sample was squeezed, neutralized with 1% NaOH solution, followed by soaping with 5 gpl non-ionic soap or detergent at 50°C for 15 min (instead of 45 min as in ISO-II method) [16] and finally washed in cold water and dried in air.…”

Section: Exhaust Methodsmentioning

confidence: 99%

Simultaneous Dyeing and Fire-retardant Finishing of Jute Fabric Using an Acid Dye and Selective F - R Finishing Chemicals

Samanta¹,

Bhattacharya²

2015

TLIST

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Conventionally decorative quality jute furnishing fabrics are dyed and then chemically finished as per functional requirement by two step sequential process. An attempt has been made to combine these two step process into a single step process by developing simultaneous (combined) dyeing (acid dyeing) and fire-retardant finishing process in one step by pad-dry-cure method. H2O2 bleached jute fabric has been dyed with selective acid dyes (1%) and chemically finished with different concentrations of Ortho-Phosphoric Acid, Ammonium sulphamate and Di-ammonium phosphate for fire retardant finish, by both conventional two-step sequential process and single-step simultaneous process by pad-dry-cure technique. One-step simultaneous application of Ortho-Phosphoric Acid, Ammonium sulphamate and Di-ammonium phosphate along with 1% acid dye on H2O2 bleached jute fabric shows an improvement in the surface colour strength compared to that of ordinary H2O2 bleached jute fabric when separately dyed with 1% acid dye and subsequently finished the same fire retardant agent. Both the process two stage conventional acid dyeing and fire-retardant finish and single stage simultaneous pad-dry-cure process of acid dyeing and fire retardant finish, show at par fire retardant performance. This single bath technique thus offers advantages of reduction in processing cost, saving in energy and reduction in time of treatments as well as better colour value and at per fire retardant performance.

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Graft copolymerization of acrylamide on cotton cellulose in a limited aqueous system following pretreatment technique

Cited by 36 publications

References 9 publications

Effects of Silica Content on the Properties of Poly(N-isopropylacrylamide) / Silica Nanocomposite Hydrogels

Effects of Silica Content on the Properties of Poly(N-isopropylacrylamide) / Silica Nanocomposite Hydrogels

Effects of Acid/Alkali and Cellulase Enriched Mixed Enzyme Treatments on Properties of Jute-Cotton Union Furnishing Fabric

Simultaneous Dyeing and Fire-retardant Finishing of Jute Fabric Using an Acid Dye and Selective F - R Finishing Chemicals

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