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Approaches to promote the post-cure reaction of polyimide with pendant phthalonitrile unit (CN-PI) were first realized by introducing of hydroxyl groups via chemical copolymerization or physical blending. The post-cure reaction of the CN-PI was performed at 250 or 300 °C, and monitored by various techniques, such as infrared spectroscopy (IR), differential scanning calorimetry (DSC), wide-angle X-ray...
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