Dyeing and Mechanical Properties of Ramie Fabric Treated with Liquid Ammonia.

Wakida, Tomiji; Hayashi, Aya; Lee, Myung Sun; Lee, Muncheul; Doi, Chizuko; Okada, Susumu; Yanai, Yuici

doi:10.2115/fiber.57.148

Cited by 6 publications

(4 citation statements)

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“…The liquid ammonia treatment of cottons caused a decrease of the apparent dyeing rate comparing with the mercerization despite a considerable decrease in the crystallinity 1–3. The liquid ammonia treatment is not always effective in increasing the dyeing rate not only for the cellulosic fiber,2, 4, 5 but also for the nylon 6 fiber. The liquid ammonia treatment brought about a partial transition of the crystallite structure of nylon 6 fiber from the γ‐ to the α‐form, and improved the soft hand and dyeing properties of the nylon 6 fabric 6.…”

Section: Introductionmentioning

confidence: 94%

Ammonia‐gas and liquid ammonia treatments of silk fabric

Lee

Tokuyama

et al. 2006

J of Applied Polymer Sci

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Silk fabric, Habutae, was treated with 100% ammonia-gas under atmospheric pressure and at pressures of 2, 4, and 6 kgf/cm 2 , and with liquid ammonia at Ϫ33°C. The effects of the treatment were investigated on the basis of the X-ray diffraction, DSC thermogram, moisture regain, water absorption, dyeing property, and mechanical property of the fabric. Crystallinity and equilibrium dye uptake were increased apparently by the liquid ammonia treatment, whereas effect of the ammonia-gas treatment was less than the liquid ammonia treatment. KES (Kawabata Evaluation System) shearing, bending, and tensile parameters were obtained. The modulus G, B, and hysteresis widths 2HG, 2HG5, and 2HB were decreased with the ammonia-gas treatment. On the contrary, the liquid ammonia treatment increased the parameters considerably. Therefore, it seemed that the ammonia-gas treatment is effective in enhancing the soft hand of the silk fabric.

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Section: Introductionmentioning

confidence: 94%

Ammonia‐gas and liquid ammonia treatments of silk fabric

Lee

Tokuyama

et al. 2006

J of Applied Polymer Sci

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“…Fortunately, curl, inner cavity and rough surface are basically eliminated by liquid ammonia treatment. From experimental point of view, many scholars have revealed changes of cellulose performance after ammonia treatment (Dornyi et al , 2008, 2006; Wakida et al , 2001). In this process, Cellulose I (the most important part in nature cotton and flax fiber) turns into Cellulose III.…”

Section: Introductionmentioning

confidence: 99%

Diffusion behaviors of liquid ammonia in the cellulose based on molecular dynamics simulation

Huang

2019

IJCST

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Purpose In the textile industry, liquid ammonia treatment is an important way to modify the structure of natural fibers. The purpose of this paper is to reveal the diffusion behaviors of liquid ammonia in cellulose. Design/methodology/approach To analysis the diffusion behaviors of liquid ammonia in cellulose, the cellulose model and the system of ammonia and cellulose are built. Infrared spectrum is carried out to test the model of cellulose, which is found to agree with experiment. Diffusion coefficients, free volume and hydrogen bonds are discussed to explain diffusion behaviors. Findings The results demonstrate that diffusion coefficients and free volume of systems rise with increasing temperature. The diffusion coefficients of ammonia are larger than those of water, a result in agreement with free volume. To understand the mechanism of diffusion, the numbers of hydrogen bonds are tracked. It is found that without ammonia, intrachain hydrogen bonds decrease with the increase of temperature, which indicate that the structural stability of cellulose is deteriorated. And the increased interchain hydrogen bonds show that swelling properties of cellulose become better with the increase of temperature. After ammonia treatment, the numbers of intrachain hydrogen bonds remain stable, indicating that the structure stability of cellulose chain is maintained. But, there is a substantial rupture of interchain hydrogen bonds, ammonia molecule destroys the hydrogen bond network between the original cellulose molecular chains, which intensifies the activity of cellulose molecular chains and enlarges the distance between cellulose molecular chains, showing good swelling properties. Originality/value The research findings give a detailed information about the diffusion behaviors of liquid ammonia in cellulose, which provide the theoretical evidence for liquid ammonia treatment.

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“…The disadvantages of ramie decrease its competitiveness in the high‐grade‐ garment‐fabric market greatly 2. For a long time, to improve the dyeability of ramie fibers, some chemical methods, including mercerizing, cation modification,3 liquid ammonia treatment,4 copper ammonia solution modification,5 acetylation modification,6 and alkylation modification,7 have been developed to modify the morphology and molecular structure of the ramie fiber, However, some problems needed to be solved when these methods were used 8. Cation modification may bring with it the problem of level dyeing, liquid ammonia treatment is characterized by high cost, the copper ammonia solution is unstable and can produce ammonia gas easily, acetylation modification and alkylation modification result in the loss of some good characteristics of the original ramie, the mercerization of ramie fabric exhausts a large quantity of alkaline solution and extensive water for washing, and all of these processes bring with them the problem of environment pollution.…”

Section: Introductionmentioning

confidence: 99%

Effects of a pretreatment with N‐methylmorpholine‐N‐oxide on the structures and properties of ramie

Gao

Chen

Han

et al. 2010

J of Applied Polymer Sci

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To improve the dyeing properties of ramie, the ecofriendly organic solvent N-methylmorpholine-N-oxide (NMMO) was used to substitute sodium hydroxide as a ramie-fiber swelling solvent. Through padding and baking pretreatment, ramie fabric was modified by an NMMO aqueous solution. Ultraviolet-visible spectrophotometry, Fourier transform infrared spectroscopy, X-ray diffraction, and differential scanning calorimetry were used to investigate the effects of NMMO pretreatment on the structure of the ramie, whereas the color strength (K/S, where K is the light absorption coefficient and S is the scattering coefficient), adsorption isotherm, and dye uptake rate curve were measured to investigate the effects of NMMO pretreatment on the dyeing properties of the ramie. The results show that the ramie fiber experienced a limited and irreversible swelling because of the partial breakage of interhydrogen and intrahydrogen bonds of cellulose molecules in the amorphous area, but the crystal and chemical structure of the ramie fiber did not change obviously under the experimental conditions. The K/S value of the NMMO-modified ramie fabrics dyed with reactive dyes increased by about 100%, and the dye uptake increased by 27.88% compared to that of the raw sample, whereas the standard affinity and diffusion coefficient value of the reactive dyes on the NMMO-modified ramie fabric were higher than those of the raw ramie fabric.

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Dyeing and Mechanical Properties of Ramie Fabric Treated with Liquid Ammonia.

Cited by 6 publications

References 0 publications

Ammonia‐gas and liquid ammonia treatments of silk fabric

Ammonia‐gas and liquid ammonia treatments of silk fabric

Diffusion behaviors of liquid ammonia in the cellulose based on molecular dynamics simulation

Effects of a pretreatment with N‐methylmorpholine‐N‐oxide on the structures and properties of ramie

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