Plastic processing technologies process comparison

Other semi-2-IPNs [52] processed by the freeze-drying method included IPN from 4,4 -bismaleimido diphenylmethane (BMI) and linear BTDA/3,4 -ODA polyamic acid that were dissolved in 1,3,5-trioxane (Fig. 16). The resulting semi-2-IPNs exhibited higher Tgs and reduced phase separation, and contained no plasticizing solvent. A comparison of unidirectional properties of composites prepared by the freeze-dry process to those by traditional solvent evaporation process is presented in Table 13. The freeze-drying method for the preparation of IPNs appears to be superior to previous technology. 

Polycarbonates can be processed with common plastic manufacturing processes. Technologies like injection molding, extrusion and casting bear good shaping opportunities. In comparison to transparent polymers like PMMA or PET, polycarbonates show extraordinary transparency, strength and endurance. 

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