While foaming at high temperature, the adjacent cyano groups and carboxyl groups in the MAA-MAN copolymer have affinity The nucleus addition reaction forms a cyclic imide structure. It is a new type of polymer structure foam material with excellent comprehensive performance.High temperature resistant PMI foam'>PMI foam has the characteristics of light weight, high strength, and high/low temperature resistance. The strong polarity and high rigidity of the structure give the PMI foam material a good comprehensive performance.
The mechanical properties decrease obviously with the increase of temperature and the heat resistance is poor, Wholesale China cascell so the continuous use temperature is about 60℃, and the highest should not exceed 80℃. High temperature resistant PMI foam is a relatively hard structural core material under the same density condition. Polymethacrylimide foam is a kind of light, closed cell Rigid foam plastics, specific performance characteristics: excellent mechanical properties.
It has the characteristics of light weight and high strength. Specific strength and specific modulus are higher than PU and PVC; excellent chemical resistance; good compatibility with other resins; easy mechanical processing; easy thermoforming; Good fire resistance. It is mainly used in aerospace, radar antenna cover, CT medical bed board, wind power helicopter blade, high speed In trains and even building materials. PMI foam, core material foam, high temperature resistant foam The nature of pet foam requirements for carbon fiber sandwich foam reinforcement.
At the foaming temperature of 180-230℃, the foaming agent embedded in the copolymer is vaporized to prepare PMI foam board. MAA and MAN are polymerized by free radical bulk to obtain MAA-MAN copolymer sheet. The characteristic temperature of polystyrene is: embrittlement temperature of about -30°C, glass transition temperature of 80 to 105°C, melting temperature of 140 to 180°C, and decomposition temperature of 300°C or more