A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Abstract Polyamides are macromolecular materials containing periodically recurring amide (CONH) groups in the linear molecular chains. They show characteristics which distinguish them from other polymers, due to the amide groups forming intermolecular hydrogen bonds which strongly influence the mechanical behaviour. Polyamides can be divided into two basic types depending on whether the molecules are inherently flexible or rigid: (1) Aliphatic polyamides or nylons are flexible-chain polymers. The many types of nylon in use differ from each other in the ratio and position of CONH groups relative to CH2 groups in the chains. Nylons are partially crystalline thermoplastics, which can be moulded and extruded to form films or fibres with useful engineering properties. (2) Rigid-chain aromatic polyamides are finding increasing use in special applications where high temperature stability and high modulus are required and also as liquid crystal polymers in electronic devices. These materials are also synthesised in several chemical species. Aromatic polyamide fibres (aramid fibres) are, however, not thermoplastics, and require strong acids or special solvents for their manufacture. In addition, partially aromatic polyamides (i.e. substances combining aliphatic and aromatic groups) are also of considerable interest.
Abstract Polyamides are macromolecular materials containing periodically recurring amide (CONH) groups in the linear molecular chains. They show characteristics which distinguish them from other polymers, due to the amide groups forming intermolecular hydrogen bonds which strongly influence the mechanical behaviour. Polyamides can be divided into two basic types depending on whether the molecules are inherently flexible or rigid: (1) Aliphatic polyamides or nylons are flexible-chain polymers. The many types of nylon in use differ from each other in the ratio and position of CONH groups relative to CH2 groups in the chains. Nylons are partially crystalline thermoplastics, which can be moulded and extruded to form films or fibres with useful engineering properties. (2) Rigid-chain aromatic polyamides are finding increasing use in special applications where high temperature stability and high modulus are required and also as liquid crystal polymers in electronic devices. These materials are also synthesised in several chemical species. Aromatic polyamide fibres (aramid fibres) are, however, not thermoplastics, and require strong acids or special solvents for their manufacture. In addition, partially aromatic polyamides (i.e. substances combining aliphatic and aromatic groups) are also of considerable interest.
Oriented Polyamides
Owen, A. J. (author)
Developments in Oriented Polymers—2 ; 237-268
1987-01-01
32 pages
Article/Chapter (Book)
Electronic Resource
English
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