Reduction of aging tendency inp-aramide fibers using ultrasound

Andrassy, Maja; Pezelj, Emira; Čunko, Ružica

doi:10.1002/1097-4628(20000912)77:11<2340::aid-app2>3.0.co;2-i

Cited by 4 publications

(4 citation statements)

References 1 publication

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“…The relationship between intrinsic viscosity and molecular mass (M n , M w ) according to Griehl and Neue [29] was used for molecular mass calculation.…”

Section: Determination Of Fibre Structurementioning

confidence: 99%

Structure-properties relationship of poly(ethylene terephthalate) wool-type fibres

2008

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Two PET wool-type fibres were studied for this research, i.e. a normal wool-type and a low-pilling modification. The structural morphology and crystalline orientation of the fibres were investigated by means of wide-angle x-ray scattering (WAXS), density measurements and infrared (IR) spectroscopy. The degree of crystallinity, crystallite orientation, apparent crystallite dimensions and micro-void system were determined by x-ray scattering. Birefringence measurements were used to study the average molecular orientation and the orientation of macromolecular chain segments in the amorphous regions. In addition, PET samples were conventionally dyed and the effect of the structure on colour was followed using colorimetry. Significant differences between the two PET wool fibre types were observed; i.e. crystallinity is higher for the standard PET wool fibre type, the crystallites are slightly larger and better oriented, long periods are larger, the orientation of molecular segments in non-crystalline phase is higher, and bigger voids are formed. The observed structure gives rise to fibres higher tenacity and higher bending stiffness.

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“…The relationship between intrinsic viscosity and molecular mass (M n , M w ) according to Griehl and Neue [29] was used for molecular mass calculation.…”

Section: Determination Of Fibre Structurementioning

confidence: 99%

Structure-properties relationship of poly(ethylene terephthalate) wool-type fibres

2008

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“…1 It is reported that the strength of PPTA degrades almost by 30% after 24 h exposure to the influence of UV and visible spectra of light (from 280 to 830 nm). 2 Konarzewski et al. 3 found that polyaramide fiber shows a pronounced decrease of 80% in tensile strength when exposed to weathering for 12 months under real climatic conditions.…”

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confidence: 99%

“…1 It is reported that the strength of PPTA degrades almost by 30% after 24 h exposure to the influence of UV and visible spectra of light (from 280 to 830 nm). 2 Konarzewski et al 3 found that polyaramide fiber shows a pronounced decrease of 80% in tensile strength when exposed to weathering for 12 months under real climatic conditions. The influences of UV radiation on the ballistic performance of PPTA fabric are also very important, and it is reported that the ballistic energy absorption of the fabric would decrease by almost 10% and the trauma depth would increase by 3 mm under exposure to 310 h of UV radiation.…”

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confidence: 99%

Growing ZnO nanowires on aramid fabric for improving the ultraviolet aging property

Chu

Chen

Huang

et al. 2022

Textile Research Journal

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Aramid fiber is commonly used for ballistic vests because of its excellent mechanical properties. However, it has a drawback in that the fiber force deteriorates under ultraviolet (UV) irradiation. It is proposed in this paper to grow ZnO nanowires on aramid fabric through the hydrothermal method for improving its UV aging properties. Fourier transform infrared spectroscopy analyses illustrate that there is some damage to the N-H and C-N chemical bonds for bare aramid fabric after UV irradiation, although no significant damage is shown by scanning electron microscopy observation. For fabrics subject to 120 h UV irradiation, the warp and weft tensile force of bare fabric decrease by 38.44% and 18.15%, respectively. However, the warp and weft tensile force of fabric with ZnO nanowires increase by 275.52% and 164.84%, respectively, and remain at 241.67% and 197.13% after UV irradiation, respectively. In addition, the burst force of bare fabric decreases over by 50% due to the UV irradiation. Nevertheless, with ZnO nanowires, the burst force of aramid fabric increases dramatically and the increase percentage is over 200%. Even after the UV irradiation, the burst force of fabric with nanowires still retains almost 30% over the bare fabric.

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“…Ultrasound action reflects the change in sorption properties of fibers with a simultaneous increase in the resistance to the action of tensile forces. [17][18][19][20][21][22] Pre-treatments are expected to enhance the accessibility of cellulose molecules and to improve their crosslinking effect with PCA.…”

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confidence: 99%

Effect of preswelling and ultrasound treatment on the properties of flax fibers cross-linked with polycarboxylic acids

Šurina

Andrassy

2012

Textile Research Journal

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This paper presents the investigation of sorption and mechanical properties of single flax fibers (fiber bundle) cross-linked with polycarboxylic acids (PCA; citric acid [CA] and 1, 2, 3, 4-butanetetracarboxylic acid [BTCA]). The improvement of the chemical modification performance was carried out by pre-treating of the fibers with sodium hydroxide and ultrasound (US). Thus, the purpose of the investigations was to determine whether the sorption and mechanical properties of the cross-linked fibers would be enhanced by a preswelling and US treatment before the application of PCA. The effect of cross-linking PCA with cellulose molecules on flax fiber properties was determined by measuring and comparing the properties (fineness, tenacity, and elongation at break; breaking twist; moisture absorption; and water-retention value) of untreated and modified flax fibers. The test results indicate that treatment with PCA undoubtedly changes the tested properties: water retention values decrease while the resistance to tenacity increases. The observed changes are the result of structural alterations in fibers. Fourier-transform infrared (FT-IR) spectra confirmed that cross-linking between the carboxyl groups of acids and the hydroxyl groups of cellulose occurs due to the esterification reaction. Preswelling and US treatments have increased the accessibility of cellulose in flax fibers, and cross-linking was achieved with less fiber damage, whereby US proved to be a more successful pre-treatment.

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Reduction of aging tendency inp-aramide fibers using ultrasound

Cited by 4 publications

References 1 publication

Structure-properties relationship of poly(ethylene terephthalate) wool-type fibres

Structure-properties relationship of poly(ethylene terephthalate) wool-type fibres

Growing ZnO nanowires on aramid fabric for improving the ultraviolet aging property

Effect of preswelling and ultrasound treatment on the properties of flax fibers cross-linked with polycarboxylic acids

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