Thermal behaviour of copolymers of acrylonitrile with haloalkyl acrylates or methacrylates

✍ Scribed by P. Bajaj; M. Padmanaban

• Publisher: Elsevier Science
• Year: 1985
• Tongue: English
• Weight: 261 KB
• Volume: 21
• Category: Article
• ISSN: 0014-3057
• DOI: 10.1016/0014-3057(85)90072-2

✦ Synopsis

Thermal stabilities of copolymers of acrylonitrile with 4-14 mol% of 3-chloro-2-hydroxypropyl acrylate or methacrylate, 2-chloroethyl acrylate or methacrylate and 2-bromoethyl acrylate or methacrylate were studied by TGA in air. A two-step degradation between 30(1 and 350 ° and 600 and 650 ° is observed for both PAN and the copolymers. Initially, the degradation is slow up to 350 ° for the copolymers (8-23% wt loss) compared with PAN (27% wt loss); the trend reverses after 351) °. A mechanism of the degradation has been proposed on the basis of i.r. studies of the residue of the copolymers isothermally heated at 300 ° for 10 min. The influence of the haloalkyl comonomers on the flammability of acrylic copolymers in terms of limiting oxygen index is also reported.