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| Titel: |
Synthesis and application of reactive stiffening agent based on the methlyolated products of (poly-acrylamide) guar gum polyblends |
| Auteur: |
Zahran, M. K. Mahmoud, R. I. Morsy, M. S. Rafie, M. H. El |
| Verschenen in: |
The journal of the Textile Institute |
| Paginering: | Jaargang 98 (2007) nr. 3 pagina's 201-208 |
| Jaar: |
2007 |
| Inhoud: |
Polyacrylamid-guar gum polyblends have been prepared via graft copolymerization of acrylamide onto guar gum using KBrO3/thiourea redox system as initiators. In order to obtain polyblends with suitable viscosity and full total conversion the prepared polyblends were subjected to further treatment with K2S2O8. The amide groups in the polyblends are converted to reactive groups through methylolation with formaldehyde, with a view to obtain reactive polyblends. The feasibility of utilization of the obtained reactive polyblends as permanent stiffening agents for cotton fabrics was studied. The reactive polyblends (i.e. methylolated polyblends) was then applied to cotton fabrics using the conventional pad-dry-cure method under various conditions. The influence of curing temperature, duration and type of catalysts (i.e., ammonium sulphate (NH4)2SO4 and ammonium chloride (NH4Cl) on the cross-linking reactions between the reactive polyblends in question and the cotton cellulose was investigated. The efficiency of the cross-linking reaction was monitored via determining nitrogen percentages. Evaluation tests on tensile properties (i.e., tensile strength (TS), and elongation at break (EAB), crease recovery angle (CRA), and stiffness were made. The results obtained indicate that reactive polyblends, the cotton fabrics under the optimum pad-cure conditions arrived at (3%Nmethylol-PAam-GG, 0.5% (NH4)2SO4; curing temperature 140°C, and curing time, 5 min) produces fabric having excellent permanent stiffness, superior tensile strength as compared with that of untreated fabric. Tentative mechanisms, including different chemical events that can occur through the whole course of polymerization, methylolation and cross-linking processes, are reported. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 11 van 13 gevonden artikelen
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