Effect of degradative treatments on cotton graft copolymers. Part III. Oxidation of poly(methacrylic acid)‐cotton graft copolymers by sodium hypochlorite

Abstract

Hypochlorite oxidation of poly(methacry1ic acid)-cotton graft copolymers was examined and compared with that of ungrafted and initiator-treated cottons. The extent and rate of oxidation, carboxyl content, copper number, and tensile strength were measured in dependence of time. The results are discussed with respect t o the structure of the original and the grafted cotton. Der EinfluP oon Abbaubehandlungen auf Baumwoll-Pfropfcopolymere. Teil I I I . Oxidation von Poly(methacry1sciure)-Baumwoll-Pfropfcopolymeren durch NatriumhypochloritDie Oxidation von Poly(methacry1saure)-Baumwoll-Pfropfcopolymeren mittels Hypochlorit wurde untersucht und mit der Oxidation von ungepfropfter sowie nur mit dem Initiator behandelter Baumwolle verglichen. AusmaB und Geschwindigkeit der Oxidation, Carboxylgehalt, Cupferzahl und ReiBfestigkeit wurden in Abhangigkeit von der Zeit gemessen. Die Ergebnisse werden anhand der Struktur der Ausgangs-und der gepfropften Baumwolle diskutiert. BnuJinue aecmpykyuonnod 06paboml~u npueumacx cononufiepoe xfionica. Yacmb I I I . Okucnenue zunoxfiopumo-~ nampua npueumbm cononwepoe xfionxa c nofiuwrnaicpufioeoCi nucnomoCi~CcJreAOBaHO OKHCJIeHHe rHIIOXJIOpHTOM IIpHBHTbIX COnOJIHMepOB XJIOIIKa C nOJIHMeTaKpH3OBOfi KHCJIoTOfi, a TaKme OKUCJIeHEle HenpHBHTOrO XJIOIlKa H XJIOnKa 0 6 p a 6 0~a~~o r o TOJIbKO HHHqHaTOPOM. B 3aBHCHMOCTH OT Bpe-MeHIl H3MepHJIHCb r n y 6~a a H CKOpOCTb OKHCJIeHMH, COAepmaHHe Kap6OKCHJIbHbIX rpynll, MeAHOe YHCJIO M npO4-HOCTb pa3pbIBa. Pe3yJIbTaTbI 06cym~am~cfx H a OCHOBe CTpYKTpbl HCXOAHOrO H UPHBElTOrO XJIOnKa.

Graft copolymerization of acrylate monomers onto sulfonated jute–cotton blended fabric

“…Thus, the higher availability of monomer radical sites in the vicinity of immobile cellulose macroradical increased the percent graft yield. 5,23 From our experiment, it was observed that the percent graft efficiency decreased with the increase of monomer concentration, as more monomer radical prevails to form homopolymer over grafting.…”

Graft copolymerization of nitrile monomers onto sulfonated jute‐cotton blended fabric

“…This is because in the absence of KMnO 4 in the polymerization medium, cellulose as well as monomer were not converted to their radicals. 23 However, the percent graft yield increased with the increase of permanganate concentration up to 0.6%-0.9%-that is 0.6% for AN and 0.9% for MAN and beyond this range, the graft yield decreased. A similar behavior also was true for homopolymer.…”

“…This may be because of the higher availability of monomer molecules in the vicinity of immobile cellulose macroradicals as well as a higher monomer concentration in the polymerization medium. The greater availability of the monomer in the polymerization medium acted in favor of molecular collision, 5,23 thereby enhancing polymerization in general or homopolymer formation in particular. The decreased percent graft yield of more than 80% suggests that homopolymerization prevails over grafting at a higher monomer concentration.…”

Synthesis and Characterization of Poly(Acrylic Acid) and Poly(Glycidyl Methacrylate) Chitosan Graft Copolymers and Their Application to Cotton Fabric

“…In addition, the Br 2 molecules liberated at higher bromate concentrations [Eq. (7)] may also contribute to the oxidation of chitosan with subsequent degradation of the chitosan macromolecules [17][18][19][20][21][22] .…”