期刊
ACS MATERIALS LETTERS
卷 4, 期 6, 页码 1132-1138出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsmaterialslett.2c00283
关键词
-
资金
- National Natural Science Foundation of China [21935004]
This study fabricates poly(vinyl alcohol) (PVA)-based supramolecular plastics capable of degrading in soil and recycling under mild conditions. The plastics exhibit satisfactory mechanical strength in watery environment due to the hydrogen-bond-cross-linked hydrophobic domains, and can rapidly degrade into harmless hydrogel pieces in seawater.
It remains a formidable challenge to fabricate degradable plastics that are recyclable, easy for processing and safe for use in seawater. In this study, poly(vinyl alcohol) (PVA)-based supramolecular plastics capable of degrading in soil and recycling under mild conditions are fabricated by grafting 4-carboxybenzaldehyde (CBA) onto PVA chains (hereafter denoted as PVA-CBA). The PVA-CBA plastics are dynamically cross-linked with a high density of hydrogen bonds and hydrogen-bond-cross-linked hydrophobic domains. The PVA-CBA plastics exhibit a yield strength of similar to 84 MPa, which remains to be similar to 40 MPa when the plastic is fully immersed in water. The satisfactory mechanical strength of the PVA-CBA plastics in watery environment originates from the hydrogen-bond-cross-linked hydrophobic domains comprised of CBA groups connected with PVA segments. Benefiting from the reversibility of hydrogen bonds, the PVA-CBA plastics can be conveniently processed to obtain products of desired shapes and are also recyclable under mild conditions for repeated usage. Importantly, the PVA-CBA plastics are autonomously and completely degradable in soil. In seawater, the PVA-CBA plastics can rapidly fragment into extremely soft, tiny and nontoxic hydrogel pieces that are safe to marine animals. Moreover, the PVA-CBA plastic bags can preserve the freshness of fruit much better than polyethylene bags.
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