《Table 1 Solubilities of PPN/BZ blends in various solvents》

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《Designing a Phthalonitrile/Benzoxazine Blend for the Advanced GFRP Composite Materials》

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Note:++，soluble；+-，partially soluble；--，insoluble

Solubilities of PPN/BZ blends in various solvents at room temperature are given in Table 1.PPN can only be dissolved in the high boiling point polar solvents.In fact，a high boiling point solvent should be avoided as likely as possible during the wet prepreg process.It is well known that，the residue of high boiling point solvent leads to cavitation defect，weak interface interaction and poor comprehensive properties in the final GFRP composites.Encouragingly，the solubility of PPN/BZ blend with only 10 wt%BZ content has been obviously improved.It can be dissolved in the common solvents such as butanone that wet prepreg process always employs.The possible reason is that the rigid molecules of PPN has been rearranged in the existence of BZ.In addition，the polar hydroxyl groups formed during the BZ ring-opening can enhance the interactions between PPN/BZ blends and solvent molecules.Good solubilities of PPN/BZ blends in the low point solvents provided possibilities for GFRP composite preparation through the traditional wet prepreg method.