Copolymers of styrene and maleic anhydride have been around since the 40's. The addition of maleic anhydride to the polymer backbone has a two fold effect; firstly, it increases chain stiffness and secondly chain-chain interactions are increased. Both of these effects increase the glass transition temperature of the copolymer. A production technology has been developed which enables to generate copolymers containing a relatively high maleic anhydride content (typically up to 35 wt %) resulting in materials with glass transition temperatures up to 170 deg C. A technology has been discovered and patented whereby these high maleic anhydride containing copolymers can, under the influence of the right chemistry and temperatures (between 230 - 260 deg C), release carbon dioxide which is then used as the blowing agent to generate low density (intrinsically blown) foams.
Intrinsically foamed SMA in interior trim applications
Selbstschäumendes Styrol Maleinsäureanhydrid für Innenausstattungen
SAE Technical Papers ; 1-6
1994
6 Seiten, 5 Bilder, 2 Tabellen
Conference paper
English
Intrinsically Foamed SMA in Interior Trim Applications
SAE Technical Papers | 1994
|Intrinsically foamed SMA in interior trim applications
Automotive engineering | 1994
|