By Arthur D. Broadbent
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1). 7 Some inter-chain bonds between protein chains in wool Another type of much weaker intermolecular bond is that occurring between permanent dipoles. Such dipoles arise from the unequal sharing of electrons in covalent bonds between atoms of different electronegativity. The result is a bond with one end somewhat electron deficient and therefore more positive than the other electron rich and relatively negative end. The separated partial charges represented by d+ and d– constitute a dipole, and attraction between the opposite ends of the dipoles in molecules results in weak bonds.
For hydrophilic fibres such as wool, cotton and viscose, the relatively high regain values significantly influence the gross weight of a given amount of fibre. This has consequences in buying and selling, and is also significant in dyeing. Amounts of dyes used are usually expressed as a percentage of the weight of material to be coloured. 00 g of dye for every 100 g of fibre, usually weighed under ambient conditions. For hydrophilic fibres, the variation of fibre weight with varying atmospheric conditions is therefore an important factor influencing colour reproducibility in repeat dyeings.
2 illustrates the radical polymerisation of acrylonitrile. Polymers made by polyaddition invariably have a skeletal chain composed only of carbon atoms and the repeating unit in the polymer has the same types and numbers of atoms as the monomer. 2 Radical polymerisation of acrylonitrile The formation of esters and amides from carboxylic acids and their derivatives involves the elimination of a simple product of low molecular weight, such as water. 1). Nylon and polyesters are made by polycondensation.