Dielectric loss of poly(aryl ether)reduction by hot-pressing treatment
Limiting the movement of polar molecules is an effective means to reduce the dielectric loss of polymers.Poly(aryl ether)containing naphthalene biphenyls is synthesized and then hot pressed to reduce its free volume and limit the movement of molecular chain segments,thus reducing the dielectric loss of the material.The experimental results show that the dielectric loss of series of poly(aryl ether)films decreases obviously after hot-pressing treatment,and the decrease rate is up to 10.27％.The decrease of free volume also increases the glass transition temperature by the maximum increase rate of 13.0％.The intermolecular chain spacing is tested and calculated by XRD to reflect the change of the free volume of the material.The change of the free volume fraction of the poly(aryl ether)before and after hot-pressing is simulated by Materials Studio software.Both changes are consistent with the changes of the dielectric loss and the glass transition temperature of the material,which proves that it's a feasible means to reduce the material's free volume by hot-pressing treatment to improve its performance.
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