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. 2021 Aug 2;13:162. doi: 10.1007/s40820-021-00693-5

Fig. 8.

Fig. 8

FTIR spectra of initial CPA, CPA-130 ℃ 30 min (refer the initial CPA after heating at 130 ℃ for 30 min, retro-DA) and CPA-60 ℃ 2 h (means the CPA-130 ℃ 30 min continue to place at 60 ℃ for 2 h to re-crosslinked due to DA reaction)