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Properties of a polyamide thermoplastic based on 2,2‐bis‐(4‐aminocyclohexyl)propane
Author(s) -
Hill H. Wayne,
Campbell Robert W.,
Shuk Robert S.
Publication year - 1978
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760180108
Subject(s) - glass transition , materials science , polyamide , thermoplastic , crystallinity , amorphous solid , alicyclic compound , polymer , diamine , composite material , propane , polymer chemistry , nylon 6 , chemical engineering , organic chemistry , chemistry , engineering
The structure and properties of an unusual new polyamide copolymer derived from 2,2‐bis‐(4‐aminoeyclohexyl)propane and a 60/40 molar mixture of azelaic and adipic acids are described. The alicyclic diamine structure, with its cyclohexyl rings and central gem‐dimethyl group, contribute to chain stiffness and amorphous character in the polyamide, and sets it apart from more common polyamides (e.g., nylon 6–6) with their relatively flexible polymer chains, low glass transition temperatures and high levels of crystallinity. The particular combination of dicarboxylic acids employed yields a resin with a high glass transition temperature (185°C). This amorphous, colorless material is exceptionally transparent, with a high luminous transmission (92 percent) and low haze (0.5 percent). The polymer is tough and resistant to scratching and abrasion and to attack by chemicals and solvents. Its high glass transition temperature leads to a high heat deflection temperature (160°C) and excellent retention of its mechanical properties at elevated temperatures. It is an atypical nylon in that its dimensions, mechanical properties and electrical properties are relatively unaffected by changing moisture content.