. 2023 Jun 15;15(25):30780–30792. doi: 10.1021/acsami.3c04661

Table 1. FTIR Fingerprints Associated with Functional Groups Amide I (C=O Stretching) Band and Amide II (N—H Bending) Band Obtained from Polyacrylamide, As-Printed, Dry, and Swollen Dog-Bone DN Gel Structures^a.

PAAm reported	PAAm	DN gel structure	DN gel structure (stretched)	dried DN gel structure	dried DN gel structure (stretched)	swollen DN gel structure	swollen DN gel structure (stretched)	assignment
1618	1600	1598	1608	1602	1610	1609	1609	δ, NH₂ amide II
1660	1668	1672	1670	1653	1655	1671	1671	ν, C=O amide I

ν Stretching; δ, bending.⁴⁸

Table 1. FTIR Fingerprints Associated with Functional Groups Amide I (C=O Stretching) Band and Amide II (N—H Bending) Band Obtained from Polyacrylamide, As-Printed, Dry, and Swollen Dog-Bone DN Gel Structuresa.