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(A) Free-standing film of [HOCS/SPEEK-P2]200. Cross-section images of (B) [HOCS/SPEEK-P2]200 and (C) [HOCS/SPEEK-P3]200. The arrows show the cross-sections of films. (D) Representative stress-strain curve of [HOCS/SPEEK-P3]200 and [HOCS/SPEEK-P2]200
