By B L Deopura, R Alagirusamy, M Joshi, B Gupta
Polyesters and polyamides stay the main used workforce of man-made fibres. This authoritative ebook stories tools in their creation, methods of enhancing their performance and their wide selection of purposes. the 1st a part of the e-book describes uncooked fabrics and production methods, together with environmental concerns. half considers methods of bettering the performance of polyester and polyamide fibres, together with mixing, weaving, colour and different completing strategies in addition to new options similar to nanotechnology. the ultimate a part of the e-book experiences the diversity of makes use of of those very important fibres, from clothing and sports clothing to car, clinical and civil engineering purposes. With its special editors and overseas group of individuals, Polyesters and polyamides is a customary reference for all these utilizing this crucial workforce of fibres.
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Extra resources for Polyesters and Polyamides (Woodhead Publishing Series in Textiles)
395 g/cc. Melting point and glass transition temperature of PBT are 225˚C and 25˚C respectively. , 1988). Under moderate conditions, the degree of crystallinity is about 35 to 40 per cent. 1 per cent after 24 h. However, PBT is not recommended for extended use in water/aqueous solution above 52˚C. PBT is intrinsically resistant to detergents, weak acids and bases, aliphatic hydrocarbons, fluorinated hydrocarbons, alcohols, ketones, MEG, carbon tetrachloride, oils and fats at ambient temperature.
0 dL/g correspond to number of average molecular weights of approx. 10 000, 18 000, 24 000 and 40 000 g/ mol respectively. 98 dL/g. 7. 85 dL/g. 0 dL/g respectively. 8 Unit cell parameters of PET a (nm) b (nm) c (nm) α (°) β (°) γ (°) ρcrystal (g/cc) Ref. 4 wt. % of titanium oxide (TiO2) as delustring agent. 8 shows the crystalline data of PET. 8 kJ/ mol. Polyethylene glycol (PEG) with different molecular weights is added to enhance the dye receptivity of PET fibres. Like most materials, PET tends to produce small crystallites when crystallised from an amorphous solid, rather than forming one large single crystal.
When crystallisation temperature is ≤200˚C, α-crystal is formed whereas the formation of β-crystal is at crystallisation temperature of ≥240˚C. , 1998). 52˚. The dielectric constant (ε) of PEN is lower than that of PET in the entire temperature range. PEN is more suitable for high temperature applications because tanδ of PEN is higher than that of PET at room temperature, but is lower than those of PET at 90 and 130˚C. PEN has greater chemical resistance than PET. Even though this is a desirable property for many applications, it makes PEN difficult to characterise by IV measurements, GPC, NMR and end-group analysis and this difficulty is even greater for highly crystalline material.