Achieving Low Dissipation Factors and Low Dielectric Constants via Thermally Stable Naphthalene-Based Poly(ester-imide)s with Fluorine Groups.

When increasing the NPDA ratio, the water absorption values show a decreasing trend from 0.93 of PEI-NPDA-0 to 0.73% of PEI-NPDA-100.

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When increasing the NPDA ratio, the water contact angle shows an increasing trend from 66.3 of PEI-NPDA-0 to 75.9° of PEI-NPDA-100, which indicates weakened affinities between the film and water, resulting in decreased water absorption.

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