Grafting vinyl monomers onto silk fibers. II. Graft copolymerization of methyl methacrylate onto silk by hexavalent chromium ion

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

doi:10.1002/app.1979.070230507

Cited by 47 publications

(8 citation statements)

References 32 publications

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“…The whiteness index of grafted silk fibers decreased linearly with the increase of reaction temperature. At a certain temperature, whiteness index decreased with the increase of the concentration of KPS up to 1.5%; while KPS% is above 1.5%, the whiteness index of silk fibers had little decrease, which may be due to the free radical initiation mechanism of KPS used for EGDMA‐2 grafting onto silk fibers 18, 19…”

Section: Resultsmentioning

confidence: 99%

Properties of silk fibers modified with diethylene glycol dimethacrylate

Chen

Guan

Xing

et al. 2006

J of Applied Polymer Sci

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A self-prepared novel bifunctional vinyl monomer diethylene glycol dimethacrylate (EGDMA-2) was graft copolymerized onto silk fibers initiated by potassium persulfate (KPS). The moisture regain and fiber fineness of grafted silk fibers increased linearly with graft yield. The enhancement of hygroscopicity can improve the comfort of silk fabrics. The grafting conditions caused a partial degradation of the tensile strength of silk fibers, as well as the whiteness. Elongation at break increased and initial modulus decreased, which indicated that the rigidity of silk fibers declined. Stress relaxation behavior shows that grafted silk fibers have better viscoelasticity than control silk fibers. Wrinkle recovery angle tests showed that grafted silk fabrics had better wrinkle resistance property. Laundering durability test showed that with increasing graft yield, the damage to the silk fibers during laundering decreased obviously.

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Section: Resultsmentioning

confidence: 99%

Properties of silk fibers modified with diethylene glycol dimethacrylate

Chen

Guan

Xing

et al. 2006

J of Applied Polymer Sci

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“…Some of the authors 15 have recently reported On the basis of a large number of studies conexperimental evidences on a specific effect of the ducted on silk grafting, [8][9][10][11][12][13] the following reaction initiator (APS) on silk yellowing. In this work, scheme can be suggested as a possible mechanism the yellowing of silk has been systematically infor the initiation, propagation, and termination of vestigated by studying the effect of various pathe graft copolymerization of vinyl monomers onto rameters, such as temperature and APS concensilk by using APS as the initiator: tration, during the graft copolymerization of MAA and HEMA onto silk.…”

Section: Resultsmentioning

confidence: 99%

Grafting of vinyl monomers onto silk using redox systems. Yellowing of silk

Tsukada

Imai

Freddi

et al. 1998

J. Appl. Polym. Sci.

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ABSTRACT:The aim of this study is to investigate the influence of temperature, initiator concentration, and vinyl monomer on silk yellowing during grafting. A series of silk fabrics was treated at four different temperatures (70, 75, 80, and 88ЊC), with different concentrations of initiator in the range 1-4% owf, with and without methacrylamide (MAA) or 2-hydroxyethyl methacrylate (HEMA). By treating silk with ammonium persulphate (APS), in the absence of a monomer, the degree of silk yellowing increased linearly with increasing both initiator concentration and treatment temperature, indicating that the initiator plays a specific role in enhancing silk yellowing through macroradical formation. The graft copolymerization of MAA (with APS as the initiator) caused only slight changes in the intensity of silk yellowing compared to blank-treated fabrics. On the other hand, the use of HEMA resulted in a deeper yellowing of silk fabrics, especially in the 70-80ЊC temperature range, due to its higher reactivity and to the tendency to form a homopolymer, leaving unreacted macroradicals on silk fibroin backbone. Compared to APS, other initiators, such as 2,2 -azobis(isobutyronitrile) (AIBN) and 2-2 -azobis-(2-amidino propane) dihydrochloride (ADC), caused a significantly lower degree of silk yellowing when tested in the absebce of a monomer. The yellowness of silk fabrics tended to increase by grafting with HEMA, while decreased by grafting with MAA. The use of variable amounts of monomer (25-150% owf) did not influence the degree of yellowing with ADC as the initiator. The results reported in this study show that the extent of yellowing induced on silk fabrics by grafting MAA and HEMA with APS as the initiator can be limited by a suitable selection of the processing parameters (initiator concentration, temperature). Moreover, the use of both AIBN and ADC appears promising, owing to their negligible effect on silk yellowing.

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“…In general, FK should be dissolved or dispersed in proper solvents before it is processed into other applications as the dispersant can make the FK chains stretch. Amino, carboxyl, and disulfide bonds will be exposed . Here, the urea solution (8 mol/L) was applied to dissolve FK.…”

Section: Resultsmentioning

confidence: 99%

pH‐sensitive keratin‐based polymer hydrogel and its controllable drug‐release behavior

Guo

Pan

Yin

et al. 2014

J of Applied Polymer Sci

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Using feather keratin as biocompatible and inexpensive natural biopolymer and methacrylic acid as a functional monomer, we prepared a pH-sensitive feather-keratin-based polymer hydrogel (FKPGel) with grafted copolymerization. The obtained FKPGel was characterized by Fourier transform infrared spectroscopy, thermogravimetric analysis, and scanning electron microscopy. The swelling behavior and pH sensitivity of the FKPGel were investigated. When the small molecule (rhodamine B) and macromolecule (bovine serum albumin) were used as model drug molecules, the FKPGel exhibited controllable release behavior in vitro, and the hydrogels had pH sensitivity. For a small molecular drug, the cumulative release rate was 97% in 24 h at pH 8.4. For macromolecular drug, the cumulative release rate reached 89% at pH 7.4. Its release behavior could be controlled by the pH value. In summary, a simple method was found to reuse disused feathers. It is a kind of pH-sensitive hydrogels to be applied in drug-delivery systems.

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Grafting vinyl monomers onto silk fibers. II. Graft copolymerization of methyl methacrylate onto silk by hexavalent chromium ion

Abstract: SUMMARY:The graft copolymerization of methyl methacrylatc onto silk fibers was investigated in aqueous solution using quinquevalent vanadium as initiator. The rate of grafting was determined by varying monomer, acidity of the medium, temperature, nature of silk, and rcaction medium.

Cited by 47 publications

References 32 publications

Properties of silk fibers modified with diethylene glycol dimethacrylate

Properties of silk fibers modified with diethylene glycol dimethacrylate

Grafting of vinyl monomers onto silk using redox systems. Yellowing of silk

pH‐sensitive keratin‐based polymer hydrogel and its controllable drug‐release behavior

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