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Showing posts with the label Man Made fibre

The Ester

Acetate fibre: Textile fibres which are composed of ester cellulose are called acetate fibres. Acetate is a manufactured fibre in which the fibre forming substance is cellulose acetate. Where not less than 92% of the hydroxyl groups are acetylated the term tri acetated may be used as a generic description of the fibre. The term acetate is derived from acet and ate. The former comes from acetic acid (The acid of vinegar), whilst the latter denotes a chemical salt. Acetate means a salt of acetic acid. In organic chemistry, a salt is known as an ester. As a result acetate fibres are at times referred to as cellulose ester. There are two types of acetate fibres — I)              Acetate II)           Triacetate

Polyolefine

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Olefine : A manufactured fibre in which the fibre firming substance is any long chain synthetic polymer composed of at least 85% by weight of ethylene, propylene or other olefine units except amorphous (non  crystalline) polyolefines qualifying as Rubber. Polyolefine fibres are of two types — I)                    Polyethylene fibres. II)                 Polypropylene fibres. I)        Polyethylene fibres:  Fibres spun from polymers or copolymers of ethylene.                                                    ...

Polyamides

Polyamides are polymers which contain recurring amide groups as integral parts of the main polymer chain. Synthetic polyamides are made by a condensation reaction taking place between small molecules in which the linkage of molecules occurs through the formation of amide groups. Types of polyamide — •        Nylon •        Aramide Aramide : Aramide is a long chain synthetic polymer in which at least 85% of amide linkages are directly attached to two aromatic rings of a long chain synthetic polyamide. Classification: •       Kevler •       Nomex   Nylon: Nylon was the first man made organic textile fibre made wholly from raw materials from the mineral kingdom. Nylon is a manufactured fibre in which the fibre forming substance is any long chain, synthetic polyamide having recurring amide groups (-CO-NH-) as an integral part of ...

Acrylic:

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It is a manufactured synthetic fibre in which the fibre forming substance is a very long chain synthetic polymer composed of at least 85% acrylonitrile units by weight. Mod acrylic fibre: Modified polyacrylonitrilefibres are generally referred to as modacrylicfibres. The modacrylicfibres must be composed of at least 35% but not more than 85% by weight of acrylonitrile units. The remaining percentage of their respective polymer system is a polymer which makes the dyeing and printing of this fibre easier. Methylene group  – CH 2 — CH— CH 2 — CH— CH 2 — CH— CH 2 — CH— CH 2 — CH— CH 2 – CH–                  CN               CN              ...