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Representative strain-stress curves of (A): PEG2k-AT6-P and PEG2k-HDA-P; (B): PEG6k-AT6-TMP, PEG4k-AT6-TMP, PEG2k-AT6-TMP and PEG1k-AT6-TMP; (C): PEG2k-AT6-TMP and PEG2k-AT6-nD-TMP; and (D): PEG2k-AT6-TMP and PEG1k+4k-AT6-TMP films.