Silk grafting with methacrylic monomers: Process optimization and comparison

Ferrero, Franco; Periolatto, Monica; Luraschi, Marco

doi:10.1002/app.25555

Cited by 11 publications

(8 citation statements)

References 31 publications

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“…FTIR‐ATR spectra of silk grafted with methacrylic monomers by UV curing are very similar to those shown by thermal grafted products and reported in the previous paper 35. However in Figure 7 the spectra of two silk samples grafted with Araldite DY‐T, one thermal treated and the other UV cured, are compared with that of film of UV cured Araldite.…”

Section: Resultssupporting

confidence: 83%

“…The comparison between DSC thermograms of 17% MAA‐grafted samples thermal and UV cured is reported in Figure 4. The UV cured sample showed only the endothermic peak of decomposition of fibroin at about 325°C, whereas the thermal grafted fibers exhibited an additional endothermic peak at around 280°C attributed to thermal decomposition of poly‐MAA 35. This result is in agreement with the low crosslinkage yielded by the solubility rate and suggests that in UV curing MAA grafting prevails on homopolymerization.…”

Section: Resultssupporting

confidence: 72%

“…DSC thermograms of silk grafted at low add‐on with the other methacrylic monomers by UV curing are compared in Figure 5 and show the peak due to fibroin practically without differences, as observed in thermal grafting 35. Finally thermal or UV cured epoxy‐grafted fibers show also the same peak, but slightly broader and more asymmetric compared with that of the control silk, as can be seen in Figure 6.…”

Section: Resultsmentioning

confidence: 74%

“…The optimum operating conditions of thermal silk grafting with MAA and several methacrylic monomers were reported in the previous paper 35. Among these, MAA, HEMA and dimethacrylates, which resulted suitable also for UV curing, are recalled here.…”

Section: Resultsmentioning

confidence: 87%

“…In a previous paper we have reported the optimum operating conditions of thermal silk grafting with several methacrylic monomers to obtain high graft yields 35. As a continuation of this study, in the present work thermal silk grafting with epoxy monomers in water bath was first investigated, then UV curing process was studied with the aim to compare the results of both the processes.…”

Section: Introductionmentioning

confidence: 91%

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Silk grafting with methacrylic and epoxy monomers: Thermal process in comparison with ultraviolet curing

Ferrero

Periolatto

Songia

2008

J of Applied Polymer Sci

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Silk grafting with methacrylic and epoxy monomers was studied with the aim to obtain high graft yields. With both monomer types optimum operating conditions of thermal grafting in water bath were established. In particular, three epoxy monomers were tested at various concentrations, at different temperatures and reaction times, with sodium chloride or sodium thiosulphate as catalysts. Optimum yields (76-82%) were found with Araldite DY-T for 2 h at 708C with 3M sodium chloride. The results were compared with those obtained with the same monomers by UV curing, radical with methacrylates and cationic with the epoxy resin. The UV curing efficiency was tested by gel content determinations. Thermal and UV cured fibers were then subjected to measurements of fibroin solubility in ethanolcalcium chloride-water mixture to evaluate the crosslinking degree. Except in the case of methacrylamide, radical UV curing yielded fibers more crosslinked than thermal treatment, or crosslinked to the same extent, whereas cationic UV curing showed lower crosslinking effects. The grafted fibers were characterized through DSC measurements and FTIR-ATR spectrometry. Finally, surface morphology of UV-cured samples was investigated through SEM analyses which showed that the better products could be obtained with UV curing at low add-on, mainly with dimethacrylates and Araldite DY-T, whereas the thermal grafting seems to be preferable for high add-on.

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Section: Resultssupporting

confidence: 83%

Section: Resultssupporting

confidence: 72%

Section: Resultsmentioning

confidence: 74%

Section: Resultsmentioning

confidence: 87%

Section: Introductionmentioning

confidence: 91%

See 3 more Smart Citations

Silk grafting with methacrylic and epoxy monomers: Thermal process in comparison with ultraviolet curing

Ferrero

Periolatto

Songia

2008

J of Applied Polymer Sci

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Silk grafting with methacrylamide: A near‐infrared spectroscopy study

Zoccola

Boschi

Arosio

et al. 2010

J of Applied Polymer Sci

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The grafting of methacrylamide (MAA) onto silk has taken importance not only as weighting process but also as finishing operation to improve the properties of the silk fibers. It was confirmed that the MAA monomer concentration, the initiator amount, and the liquor ratio are the major parameters affecting the yield of the reaction. Varying these parameters, a large number of samples, i.e., silk yarns with different grafting yields and exhaust grafting baths with different residual MAA concentrations, were obtained. Near infrared (NIR) spectroscopy was used for the quantitative determination of MAA in silk yarns and MAA in exhaust baths after grafting. A correlation between silk yarns grafting yield and NIR spectra of MAA grafted yarns was obtained. This correlation shows a coefficient of determination (R 2 ) of 0.96 and a standard error of calibration (SEC) of 8.37 w/w for a mean value (M) of 31.82% w/w. A second correlation between MAA in exhaust grafting baths and NIR spectra was obtained. This correlation shows a R 2 of 0.95 and a SEC of 2.93 g/L for a M of 17.16 g/L. Previous correlations were improved using silk samples cleaned by extraction of sizing agents and detergents which could interfere with MAA grafting and modify absorption spectra of bath solutions.

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