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Green cinnamaldehyde and thymol modified zinc oxide with double synergistic antibacterial effects in polypropylene
Author(s) -
Shi Yanqin,
Shen Jiaqi,
Yang Dieshuang,
Du Junnan,
Lu Songyan,
Ma Meng,
He Huiwen,
Chen Si,
Wang Xu
Publication year - 2021
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.50911
Subject(s) - cinnamaldehyde , antibacterial activity , nuclear chemistry , zinc , triethoxysilane , materials science , chemistry , bacteria , organic chemistry , catalysis , biology , genetics
The green cinnamaldehyde (CA) and thymol (THY) separately or successively modified O‐ZnO (O‐ZnO‐CA, O‐ZnO‐THY, and O‐ZnO‐CA‐THY) were prepared after (3‐aminopropyl) triethoxysilane (KH550) was grafted to the surface of ZnO (O‐ZnO) and characterized by FTIR, TGA, and SEM. Polypropylene composites (PP/O‐ZnO‐CA, PP/O‐ZnO‐THY, and PP/O‐ZnO‐CA‐THY) were prepared by melting the modified O‐ZnO and PP. The antibacterial tests showed that the antibacterial rate of PP/O‐ZnO‐CA and PP/O‐ZnO‐THY against S. aureus and E. coli was obviously enhanced. It indicated an excellent synergetic antibacterial effect of O‐ZnO and the little CA or THY grafted on the surface of O‐ZnO. The antibacterial effect of O‐ZnO‐CA and O‐ZnO‐THY was related to the hydrophobic and hydrophilic groups contained in CA and THY. Importantly, CA and THY in O‐ZnO‐CA‐THY exhibited another excellent synergetic antibacterial effect against both S. aureus and E. coli . The antibacterial rate of three PP composites containing 4 phr O‐ZnO‐CA‐THY against S. aureus and E. coli reached 95% and 90%, respectively. The mechanism was regarded as that CA and THY grafted onto the same O‐ZnO improved the contact probability between antibacterial agents and bacteria. Moreover, O‐ZnO‐CA, O‐ZnO‐THY, and O‐ZnO‐CA‐THY had excellent migration resistance in the PP matrix.