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Teruo Miyata - One of the best experts on this subject based on the ideXlab platform.

  • wet spun chitosan collagen fibers their chemical n modifications and blood compatibility
    Biomaterials, 2000
    Co-Authors: Shigehiro Hirano, Min Zhang, Masuo Nakagawa, Teruo Miyata
    Abstract:

    Abstract Based on an in vitro test for an improvement of the blood compatibility of chitin by blending with tropocollagen, we prepared a novel biocompatible blended fiber and its chemically N -modified fibers. Each (1 g/30 ml) of a clear mixed solution of chitosan with tropocollagen or collagen and a clear solution of chitosan itself in aqueous 2% acetic acid–methanol (2 : 1 , v/v) was spun through a viscose-type spinneret into an aqueous 5% ammonia solution containing 40–43% ammonium sulfate at room temperature to afford a white fiber of chitosan–tropocollagen blends (1.08–1.65 g/denier for the Tenacity and 10.9–43.2% for the elongation). The tropocollagen content up to 50% by weight) in the blended fiber affected little their Tenacity and elongation values. The blended fiber was chemically N -modified at the fiber state by treatment with a series of carboxylic anhydrides and aldehydes to afford the corresponding N -modified fiber (0.86–1.31 g/denier for the Tenacity and 8.0–12.1% for the elongation). A transparent blended hydrogel of N -acetylchitosan (chitin) with tropocollagen was produced from the above mixed solution by treatment with acetic anhydride, and its membrane and sponge sheet were also prepared from the hydrogel.

  • Wet spun chitosan-collagen fibers, their chemical N-modifications, and blood compatibility.
    Biomaterials, 2000
    Co-Authors: Shigehiro Hirano, Min Zhang, Masuo Nakagawa, Teruo Miyata
    Abstract:

    Abstract Based on an in vitro test for an improvement of the blood compatibility of chitin by blending with tropocollagen, we prepared a novel biocompatible blended fiber and its chemically N -modified fibers. Each (1 g/30 ml) of a clear mixed solution of chitosan with tropocollagen or collagen and a clear solution of chitosan itself in aqueous 2% acetic acid–methanol (2 : 1 , v/v) was spun through a viscose-type spinneret into an aqueous 5% ammonia solution containing 40–43% ammonium sulfate at room temperature to afford a white fiber of chitosan–tropocollagen blends (1.08–1.65 g/denier for the Tenacity and 10.9–43.2% for the elongation). The tropocollagen content up to 50% by weight) in the blended fiber affected little their Tenacity and elongation values. The blended fiber was chemically N -modified at the fiber state by treatment with a series of carboxylic anhydrides and aldehydes to afford the corresponding N -modified fiber (0.86–1.31 g/denier for the Tenacity and 8.0–12.1% for the elongation). A transparent blended hydrogel of N -acetylchitosan (chitin) with tropocollagen was produced from the above mixed solution by treatment with acetic anhydride, and its membrane and sponge sheet were also prepared from the hydrogel.

Min Zhang - One of the best experts on this subject based on the ideXlab platform.

  • wet spun chitosan collagen fibers their chemical n modifications and blood compatibility
    Biomaterials, 2000
    Co-Authors: Shigehiro Hirano, Min Zhang, Masuo Nakagawa, Teruo Miyata
    Abstract:

    Abstract Based on an in vitro test for an improvement of the blood compatibility of chitin by blending with tropocollagen, we prepared a novel biocompatible blended fiber and its chemically N -modified fibers. Each (1 g/30 ml) of a clear mixed solution of chitosan with tropocollagen or collagen and a clear solution of chitosan itself in aqueous 2% acetic acid–methanol (2 : 1 , v/v) was spun through a viscose-type spinneret into an aqueous 5% ammonia solution containing 40–43% ammonium sulfate at room temperature to afford a white fiber of chitosan–tropocollagen blends (1.08–1.65 g/denier for the Tenacity and 10.9–43.2% for the elongation). The tropocollagen content up to 50% by weight) in the blended fiber affected little their Tenacity and elongation values. The blended fiber was chemically N -modified at the fiber state by treatment with a series of carboxylic anhydrides and aldehydes to afford the corresponding N -modified fiber (0.86–1.31 g/denier for the Tenacity and 8.0–12.1% for the elongation). A transparent blended hydrogel of N -acetylchitosan (chitin) with tropocollagen was produced from the above mixed solution by treatment with acetic anhydride, and its membrane and sponge sheet were also prepared from the hydrogel.

  • Wet spun chitosan-collagen fibers, their chemical N-modifications, and blood compatibility.
    Biomaterials, 2000
    Co-Authors: Shigehiro Hirano, Min Zhang, Masuo Nakagawa, Teruo Miyata
    Abstract:

    Abstract Based on an in vitro test for an improvement of the blood compatibility of chitin by blending with tropocollagen, we prepared a novel biocompatible blended fiber and its chemically N -modified fibers. Each (1 g/30 ml) of a clear mixed solution of chitosan with tropocollagen or collagen and a clear solution of chitosan itself in aqueous 2% acetic acid–methanol (2 : 1 , v/v) was spun through a viscose-type spinneret into an aqueous 5% ammonia solution containing 40–43% ammonium sulfate at room temperature to afford a white fiber of chitosan–tropocollagen blends (1.08–1.65 g/denier for the Tenacity and 10.9–43.2% for the elongation). The tropocollagen content up to 50% by weight) in the blended fiber affected little their Tenacity and elongation values. The blended fiber was chemically N -modified at the fiber state by treatment with a series of carboxylic anhydrides and aldehydes to afford the corresponding N -modified fiber (0.86–1.31 g/denier for the Tenacity and 8.0–12.1% for the elongation). A transparent blended hydrogel of N -acetylchitosan (chitin) with tropocollagen was produced from the above mixed solution by treatment with acetic anhydride, and its membrane and sponge sheet were also prepared from the hydrogel.

Masuo Nakagawa - One of the best experts on this subject based on the ideXlab platform.

  • wet spun chitosan collagen fibers their chemical n modifications and blood compatibility
    Biomaterials, 2000
    Co-Authors: Shigehiro Hirano, Min Zhang, Masuo Nakagawa, Teruo Miyata
    Abstract:

    Abstract Based on an in vitro test for an improvement of the blood compatibility of chitin by blending with tropocollagen, we prepared a novel biocompatible blended fiber and its chemically N -modified fibers. Each (1 g/30 ml) of a clear mixed solution of chitosan with tropocollagen or collagen and a clear solution of chitosan itself in aqueous 2% acetic acid–methanol (2 : 1 , v/v) was spun through a viscose-type spinneret into an aqueous 5% ammonia solution containing 40–43% ammonium sulfate at room temperature to afford a white fiber of chitosan–tropocollagen blends (1.08–1.65 g/denier for the Tenacity and 10.9–43.2% for the elongation). The tropocollagen content up to 50% by weight) in the blended fiber affected little their Tenacity and elongation values. The blended fiber was chemically N -modified at the fiber state by treatment with a series of carboxylic anhydrides and aldehydes to afford the corresponding N -modified fiber (0.86–1.31 g/denier for the Tenacity and 8.0–12.1% for the elongation). A transparent blended hydrogel of N -acetylchitosan (chitin) with tropocollagen was produced from the above mixed solution by treatment with acetic anhydride, and its membrane and sponge sheet were also prepared from the hydrogel.

  • Wet spun chitosan-collagen fibers, their chemical N-modifications, and blood compatibility.
    Biomaterials, 2000
    Co-Authors: Shigehiro Hirano, Min Zhang, Masuo Nakagawa, Teruo Miyata
    Abstract:

    Abstract Based on an in vitro test for an improvement of the blood compatibility of chitin by blending with tropocollagen, we prepared a novel biocompatible blended fiber and its chemically N -modified fibers. Each (1 g/30 ml) of a clear mixed solution of chitosan with tropocollagen or collagen and a clear solution of chitosan itself in aqueous 2% acetic acid–methanol (2 : 1 , v/v) was spun through a viscose-type spinneret into an aqueous 5% ammonia solution containing 40–43% ammonium sulfate at room temperature to afford a white fiber of chitosan–tropocollagen blends (1.08–1.65 g/denier for the Tenacity and 10.9–43.2% for the elongation). The tropocollagen content up to 50% by weight) in the blended fiber affected little their Tenacity and elongation values. The blended fiber was chemically N -modified at the fiber state by treatment with a series of carboxylic anhydrides and aldehydes to afford the corresponding N -modified fiber (0.86–1.31 g/denier for the Tenacity and 8.0–12.1% for the elongation). A transparent blended hydrogel of N -acetylchitosan (chitin) with tropocollagen was produced from the above mixed solution by treatment with acetic anhydride, and its membrane and sponge sheet were also prepared from the hydrogel.

Shigehiro Hirano - One of the best experts on this subject based on the ideXlab platform.

  • wet spun chitosan collagen fibers their chemical n modifications and blood compatibility
    Biomaterials, 2000
    Co-Authors: Shigehiro Hirano, Min Zhang, Masuo Nakagawa, Teruo Miyata
    Abstract:

    Abstract Based on an in vitro test for an improvement of the blood compatibility of chitin by blending with tropocollagen, we prepared a novel biocompatible blended fiber and its chemically N -modified fibers. Each (1 g/30 ml) of a clear mixed solution of chitosan with tropocollagen or collagen and a clear solution of chitosan itself in aqueous 2% acetic acid–methanol (2 : 1 , v/v) was spun through a viscose-type spinneret into an aqueous 5% ammonia solution containing 40–43% ammonium sulfate at room temperature to afford a white fiber of chitosan–tropocollagen blends (1.08–1.65 g/denier for the Tenacity and 10.9–43.2% for the elongation). The tropocollagen content up to 50% by weight) in the blended fiber affected little their Tenacity and elongation values. The blended fiber was chemically N -modified at the fiber state by treatment with a series of carboxylic anhydrides and aldehydes to afford the corresponding N -modified fiber (0.86–1.31 g/denier for the Tenacity and 8.0–12.1% for the elongation). A transparent blended hydrogel of N -acetylchitosan (chitin) with tropocollagen was produced from the above mixed solution by treatment with acetic anhydride, and its membrane and sponge sheet were also prepared from the hydrogel.

  • Wet spun chitosan-collagen fibers, their chemical N-modifications, and blood compatibility.
    Biomaterials, 2000
    Co-Authors: Shigehiro Hirano, Min Zhang, Masuo Nakagawa, Teruo Miyata
    Abstract:

    Abstract Based on an in vitro test for an improvement of the blood compatibility of chitin by blending with tropocollagen, we prepared a novel biocompatible blended fiber and its chemically N -modified fibers. Each (1 g/30 ml) of a clear mixed solution of chitosan with tropocollagen or collagen and a clear solution of chitosan itself in aqueous 2% acetic acid–methanol (2 : 1 , v/v) was spun through a viscose-type spinneret into an aqueous 5% ammonia solution containing 40–43% ammonium sulfate at room temperature to afford a white fiber of chitosan–tropocollagen blends (1.08–1.65 g/denier for the Tenacity and 10.9–43.2% for the elongation). The tropocollagen content up to 50% by weight) in the blended fiber affected little their Tenacity and elongation values. The blended fiber was chemically N -modified at the fiber state by treatment with a series of carboxylic anhydrides and aldehydes to afford the corresponding N -modified fiber (0.86–1.31 g/denier for the Tenacity and 8.0–12.1% for the elongation). A transparent blended hydrogel of N -acetylchitosan (chitin) with tropocollagen was produced from the above mixed solution by treatment with acetic anhydride, and its membrane and sponge sheet were also prepared from the hydrogel.

Punj S K - One of the best experts on this subject based on the ideXlab platform.

  • Influence of material parameters and thermal treatment on structure and properties of polyester air-jet spun yarn
    'CSIRO Publishing', 2007
    Co-Authors: Mahish, Sudipta S, Punj S K, Singh Gagandeep
    Abstract:

    150-157The effect of thermal treatment (dry and wet) under slack conditions, blend ratio and fibre cross-section on the structure and properties of air-jet spun yarns has been studied. It is observed that the thermal treatment, particularly in wet condition, increases the linear density, helix angle, helix diameter, breaking extension and abrasion resistance and decreases the mean fibre extent, Tenacity and flexural rigidity of the yarns. The increase in amount of coarser denier fibre exhibits higher helix diameter, mean fibre extent, yarn Tenacity, breaking extension, abrasion resistance and flexural rigidity, and lower helix angle. The increase in trilobal fibre content in the blend shows increased helix diameter and mean fibre extent, and lower helix angle, yarn Tenacity, breaking extension, abrasion resistance and flexural rigidity in the yarn

  • Effect of some machine variables on structure and properties of polyester-viscose air-jet spun yarn
    NISCAIR-CSIR India, 1998
    Co-Authors: Punj S K, Moitra Koushik, Behera B K
    Abstract:

    85-93The effects of second jet pressure, spinning speed and condenser width on the structure and properties of polyester-viscose blended jet-spun yarn have been studied. Tracer fibre technique has been used for the structural analysis of the yarn and the yarn properties such as Tenacity, CSP, flexural rigidity, hairiness, unevenness and imperfections have been determined and explained in the light of structural parameters. Increase in wraps/mm has been observed with the increase in both jet pressure and Spinning speed. Increase in jet pressure increases yarn Tenacity and flexural rigidity but decreases yarn hairiness. Maximum yarn Tenacity is obtained at 180m/min spinning speed and at comparatively high second jet pressure(4 kg/cm2). Increase in spinning speed increases U%, imperfections and hairiness.

  • Effect of extension rate and gauge length on tensile behaviour of ring and air-jet spun yarns
    NISCAIR-CSIR India, 1998
    Co-Authors: Punj S K, Mukhopadhyay A, Chakraborty A
    Abstract:

    19-24A comparison of the yarns spun on MJS and ring spinning system shows that both the Tenacity and breaking elongation are higher for ring-spun yarn at all extension rates and gauge lengths. With the increase of polyester fibre content in blend, Tenacity and breaking elongation increase with greater impact on air-jet spun yarn in majority of the cases. With the increase in extension rate, Tenacity increases up to a certain limit beyond which a further increase in extension rate causes drop in Tenacity. In short gauge lengths, the maximum Tenacity is obtained at lower rate of extension than is tenable from the long gauge lengths. At very long gauge length (500 mm), the Tenacity of air-jet yarn shows no decrease with the increase in extension rate. As the gauge length becomes shorter the Tenacity and breaking elongation increase for both types of yarn. The effect of change in extension rate and gauge length is more pronounced on air-jet yarn than ring-spun yarn and the F-ratio values on Tenacity also reflect this. Breaking elongation increases with corresponding increase in extension rate and decrease in gauge length with some exception. Although the F-ratio values for breaking elongation show that the effects of change in these parameters are very much significant, no specific trend is obtained.