Polymethacrylimide (PMI) foam is a closed-cell rigid foam material with excellent performance and first-class quality. It can be used as a core material for high-performance fiber composite sandwich structure to solve general foam core materials. The problem is low specific strength, low specific modulus, and low heat resistance.
Its performance characteristics are as follows: high mechanical properties: high specific strength, high specific modulus, isotropic, under the same density conditions, PMI foam tensile, compression, bending, shearing and other strengths and moduli are far Higher than polyurethane, polyvinyl chloride and other foam materials, the use of PMI foam can significantly reduce the weight of the structure. High heat resistance: It has a unique cross-linking structure, imide ring structure, high heat distortion temperature, and the highest heat distortion temperature can reach 210 ° C or above. It is the best structural foam with high heat resistance; high temperature It has good stability and can adapt to the process temperature requirements of vacuum autoclave or high temperature molding co-curing. Its process temperature can reach above 160 °C, which can shorten the process time, improve production efficiency and improve structural performance. High closed porosity: The closed cell ratio is over 95%. It is used in the composite sandwich structure to avoid the moisture absorption and degumming problems that may occur in the honeycomb structure, improve the safety performance and prolong the service life.
Due to its high closed porosity and compression resistance, it can be used as an underwater buoyancy material. High bonding strength: suitable for various resin systems such as epoxy and BMI. Fatigue resistance: The unique molecular structure of PMI foam gives it good fatigue resistance and can be applied to sandwich structures subjected to dynamic loads, and its performance is significantly better than other foam materials.
Convenience of processing: It is easy to machine and can be formed into various curved surfaces under heating conditions, which improves design freedom. Dielectric Wave Penetration: As a low-density, closed-cell foam, PMI foams have low dielectric constant, low dielectric loss over a wide frequency range, and good insulation properties for use in the radio and electronics industries. Barrier performance: good sound insulation, heat insulation, moisture and moisture resistance.