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Stretchable gas barrier films achieved by hydrogen‐bond self‐assembly of nano‐brick multilayers
Author(s) -
Shi Kaiqiang,
Xu Xiaozhi,
Dong Siyuan,
Li Biao,
Han Jingbin
Publication year - 2021
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.17373
Subject(s) - materials science , ultimate tensile strength , bilayer , hydrogen bond , substrate (aquarium) , hydrogen , covalent bond , chemical engineering , composite material , oxide , oxygen , ionic bonding , chemistry , molecule , organic chemistry , membrane , metallurgy , biochemistry , oceanography , engineering , geology , ion
Inorganic–organic hybrid films containing two‐dimensional nanosheets have shown good gas barrier performance, but moderate tensile property, because of the rigid characteristics of covalent or ionic bonds between the assembly units. In this work, we used LDH nanosheets rich in hydroxyl groups as building units, followed by modification of tannic acid (TA), to assemble with polyethylene oxide (PEO) through hydrogen bonds. Compared with previous work, the tensile property and oxygen barrier performance of (TA@LDH/PEO) n films have been significantly improved. A 50‐bilayer TA@LDH/PEO film, deposited on a 1 mm thick natural rubber substrate, results in a 29× reduction (contrast with bare substrate) in oxygen transmission rate and maintains its good barrier property even under a large elongation of 120%. The excellent tensile and gas barrier properties are attributed to the ductility of hydrogen bond network among building blocks and the significant prolongation of oxygen transmission path induced by LDH nanosheets.