Silk is a natural fibre that is a solidifies protein secretion produced by certain caterpillars. 1. Chemical Properties of Wool Effects of alkali: Wool is easily and extremely vulnerable attacked by alkalis even by weak bases at low dilutions. Silk is a natural fibre that is a solidifies protein secretion produced by certain caterpillars. Here we are describing all properties of polyester. In moderate concentration, acids cause a contraction in silk; this shrinkage is used to bring bout crepe effects in silk fabrics. One is Physical Property and another is chemical property. Silk is the result of secretion of silk glands. The physical properties of spider silk are unaffected by the addition of water to its environment. Physical and chemical properties of silk fibre. The protein fibre of silk is mainly composed of fibroin and is produced by certain insect larvae to form cocoon. One is cultivated silk and the other one is wild silk. The amino acidic pattern of sulfated silk remained essentially unchanged for short reaction times (≤2 h). To define properties of silk we need to define its physical and chemical properties. The fibre can be fine and coarse, is lustrous, smooth, light weight, strong and elastic. Seen under the microscope, wild silk may be distinguished from cultivated silk by its irregular width. Longer reaction times resulted in drastic changes in the concentration of Asp, Glu, and Tyr. PROPERTIES OF SILK FIBRE, PHYSICAL PROPERTIES OF SILK FIBRE, CHEMICAL PROPERTIES OF SILK FIBRE PHYSICAL PROPERTIES OF SILK FIBRE: Tenacity: The silk fibres has very good strength due to presence of many hydrogen bonds to be formed in a more regular pattern. Physical Properties of Silk Fibroin 74 The thermal properties of the different films are presented in Table 2 and 3. Specific gravity and tensil strength of various fibres Silk sericin is a natural polymer produced by silkworm, Bombyx mori, which surrounds and keeps together two fibroin filaments in silk thread used in the cocoon.The recovery and reuse of sericin usually discarded by the textile industry not only minimizes environmental issues but also has a high scientific and commercial value. The best known silk is obtained from cocoons of the larvae mulberry silkworm bombyx mori reared in … Spider silk attracts dew, and forms droplets that are capable of remaining on the silk strands. Thereafter we also need to clarify about the uses of silk. PROPERTIES OF SILK FIBRE, PHYSICAL PROPERTIES OF SILK FIBRE, CHEMICAL PROPERTIES OF SILK FIBRE PHYSICAL PROPERTIES OF SILK FIBRE: Tenacity: The silk fibres has very good strength due to presence of many hydrogen bonds to be formed in a more regular pattern. Physical Characteristics: The fibre is a fine continuous strand unwound from the cocoon of silkworm. The amount of sulfur bound to silk increased during the first 2 h of reaction and then reached a plateau. Silk is mainly of two types. 4. Silk fabrics were treated with chlorosulphonic acid in pyridine for different times. The amino acidic pattern of sulfated silk remained essentially unchanged for short reaction times (≤2 h). Here we will discuss step by step properties and uses of silk. IJRRAS 28 (2) August 2016 Shen et al. Specific gravity. Generally, the specific gravity of sericin is slightly higher than that of fibroin (See Raw silk, Table 8). SILK FIBRE Silk is natural protein fibre, some forms of which can be woven into textile. Silkworm cocoons have evolved a wide range of different structures and combinations of physical and chemical properties in order to cope with different threats and environmental conditions. 3. It is the designer's responsibility to select the appropriate fabrics for their intended applications, but it is the responsibility of the fabric producer to provide as much information as possible to help customers make appropriate fabric selections. alkaline solutions can open the disulphide cross-links of wool, white hot alkalis may even dissolve it. Fibroin, a sort of fibrous protein is secreted by each gland which at first is in the fluid condition. Physical and chemical properties of silk. There is much more variation in the physical properties of wild silk than there is in cultivated silk. They are a pair of long tubular and coiled glands lying one on each side of the alimentary canal of the Caterpillar. We measure it by categorizing into two way. Silk fabrics were treated with chlorosulphonic acid in pyridine for different times. Caustic soda (NaOH) will completely damage wool when used hot or for a long period. Properties and uses of silk depend on the variation of production. Effect of Acids: Like wool keratin, the fibroin of silk can be decomposed by strong acids into its constituent amino acids. They are a pair of long tubular and coiled glands lying one on each side of the alimentary canal of the Caterpillar. We need to make sure that the customer is aware of the properties and characteristics of the fabrics. Assessment of renditta, cocoon gradation, cocoon procurement and transportation. Specific gravity - 1.342 Moisture- St.… The fibre can be fine and coarse, is lustrous, smooth, light weight, strong and elastic. 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