Effectiveness of flavourzyme treatment on polyamide fabric

Song, Ah Reum; Kim, Hye Rim

doi:10.1007/s12221-013-2212-y

Cited by 10 publications

(8 citation statements)

References 33 publications

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“…This could be due to the intense hydrolysis effects on fibers from inside by the alkali treatment, resulting in higher number of amino groups. The formation of amino groups on the fabric surface has been confirmed in previous studies; newly formed amino groups were detected by dyeing the enzyme treated polyamide fabric with wool reactive dye [13,31]. The subtilisin treatment of PA 6,6 fabrics resulted in formation of primary amino groups due to the cleavage of the amide bonds.…”

Section: Surface Chemistry Of the Fabric Determination Of Amino Groups On The Fabric Surfacesupporting

confidence: 64%

Surface Modification of Polyamide 6,6 Fabrics with an Alkaline Protease – Subtilisin

Begum

Takawira

et al. 2016

Journal of Engineered Fibers and Fabrics

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Subtilisin treatment is feasible in benign conditions, and yields a clean, dynamic approach for Polyamide 6,6 (PA 6,6) modification. In this study, the water contact angle (WCA) method, capillary height and moisture regain were used measure hydrophilicity. To characterization the modification, the scanning electron microscope (SEM), amino group quantification and x-ray photoelectron spectrometry (XPS) were used. Fabric burst strength and hand properties were characterized. Optimum conditions for subtilisin treatment were found to be 55oC, neutral pH with 10% (owf) enzyme concentration for a fixed 90 min treatment period. X-ray photoelectron spectrometry (XPS) results showed that carboxyl groups were produced on the modified fiber surface. The modified fibers showed much improved hydrophilicity as indicated by reduced wicking time, improved capillary height and moisture regain percentage. The creation of carboxylic acid group sand increased number of amino groups detected on the fabric surface may positively influence hydrophilicity. In comparison to harsh alkali modification, the enzyme treatment led to smaller weight loss. In general, enzymatic treatments- a more eco-friendly alternative to alkaline treatments, resulted in a significant improvement in surface properties of PA 6,6 fabrics.

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Section: Surface Chemistry Of the Fabric Determination Of Amino Groups On The Fabric Surfacesupporting

confidence: 64%

Surface Modification of Polyamide 6,6 Fabrics with an Alkaline Protease – Subtilisin

Begum

Takawira

et al. 2016

Journal of Engineered Fibers and Fabrics

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“…The enzyme was added to the polymer together with a CaCl 2 solution (0.01 M) at 50 °C in order to enforce depolymerization and dissolve the poly(ester amide) thermosets. 58 − 60 …”

Section: Methodsmentioning

confidence: 99%

“…In general, 30 mg of the thermoset was added to water or tris buffer solution (1 mL, 100 mM, pH 8), with or without Bascillus Sp (0.8 mL, 16 units/mL, Sigma-Aldrich) enzyme. The enzyme was added to the polymer together with a CaCl 2 solution (0.01 M) at 50 °C in order to enforce depolymerization and dissolve the poly(ester amide) thermosets. − …”

Section: Methodsmentioning

confidence: 99%

Renewable (Bis)pyrrolidone Based Monomers as Components for Thermally Curable and Enzymatically Depolymerizable 2-Oxazoline Thermoset Resins

Roy

Noordzij

Boomen

et al. 2018

ACS Sustainable Chem. Eng.

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In this study we describe the synthesis of bis(pyrrolidone) based dicarboxylic acids from itaconic acid and their application in 2-oxazoline resins for fully renewable thermoset materials. The monomers are obtained using a bulk aza-Michael addition of a diamine and two itaconic acid molecules using a catalytic amount of water. The monomers can be isolated in high purity after recrystallization, though their yield proved to be highly dependent on the selected diamine spacer length: In general, only the dicarboxylic acids containing diamines with an even number of methylene spacers are isolated in high yields. Through NMR, GPC, and FTIR analysis we demonstrate that these bis(pyrrolidone) based dicarboxylic acids exhibit significantly enhanced curing rates in 2-oxazoline resins compared to resins containing aliphatic dicarboxylic acids such as sebacic acid. Overall, we demonstrate that the rate of 2-oxazoline ring-opening addition with carboxylic acid functionalities is determined by the used dicarboxylic acid, whereas the ring-opening addition of the 2-oxazoline functionality with amide groups is determined by the used bis(2-oxazoline) compound. The thermosets obtained after curing proved to be readily plasticized by water, opening up possibilities for enzymatic degradation.

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“…dependency of rate co-efficient on both the concentration of the Michael acceptor and donor (amines in this case). Over the years, various catalysts have been reported for the aza-Michael addition reaction, including acid or base catalysts 57,58 , silica supported acids 59,60 , organic compounds 61,62,63,64 , clay supported Lewis acids 65 , organic polymers 66 , and ionic liquids 67,68 . Furthermore, the aza-Michael addition reaction can be conducted in water or 69 and solvent free approach (bulk).…”

Section: Aza-michael Addition/cyclization Cascade Reaction -Biomass Fmentioning

confidence: 99%

“…In general, 30 mg of the thermoset was added to water or tris buffer solution (1 mL, 100mM, pH8), with or without Bascillus Sp (0.8 ml, 16 units/mL, Sigma Aldrich) enzyme. The enzyme was added to the polymer together with a CaCl2 solution (0.01M) at 50 °C in order to enforce depolymerization and dissolve the poly(ester amide) thermosets [58][59][60] .…”

Section: Enzymatic Depolymerization and Solubilization Proceduresmentioning

confidence: 99%

Application of pyrrolidone building blocks in developing renewable 2-oxazolines based thermosets

Roy¹

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Attenuated total reflection Fourier transform infra-red spectroscopy BHEF N,N'-bis(2-hydroxyethyl)furan-2,5-dicarboxamide BHET N,N'-bis(2-hydroxyethyl)terephthalamide BHFDA N,N-bis(2-hydroxyethyl)furan-2,5-dicarboxamide BP-C8 N,N'-octamethylene-bis(pyrrolidone-4-carboxylic acid) BP-Cx Bis(pyrrolidone) dicarboxylic acids with 'x' carbon spacer length CDCl3 deuterated chloroform CE Circular economy D2O deuterated water DMSO-d6 deuterated dimethyl-sulfoxide E factor Environmental factor EWG Electron withdrawing group FDCAox 2,5-FDCA based bis(2-oxazoline) FDCAox 2,5-bis(4,5-dihydrooxazol-2-yl)furan FTIR Fourier-transform infrared spectroscopy GPC Gel permeation chromatography

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Effectiveness of flavourzyme treatment on polyamide fabric

Cited by 10 publications

References 33 publications

Surface Modification of Polyamide 6,6 Fabrics with an Alkaline Protease – Subtilisin

Surface Modification of Polyamide 6,6 Fabrics with an Alkaline Protease – Subtilisin

Renewable (Bis)pyrrolidone Based Monomers as Components for Thermally Curable and Enzymatically Depolymerizable 2-Oxazoline Thermoset Resins

Application of pyrrolidone building blocks in developing renewable 2-oxazolines based thermosets

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