The molecular interaction between polyphenylene-ether (PPE; poly (oxy-2, 6-dimethyl-1, 4-phenylene)) and organic phosphates has been studied. When a small amount of organic phosphates such as aromatic bis-phosphate was added to PPE, the flexual modulus increased. The modulus was increased with increasing content of aromatic biphosphate. The modulus of PPE with 20% phosphate was 2.5-2.7GPa comparing to 2.45GPa for PPE without phosphate. The higher the molecular weight of phosphate was, the more increase of the modulus was observed. The results of viscoelastic measurements below room temperature suggests that the increase of the modulus is related to a restriction of local motion of the chains.
