作者:Zhao, Yan; Zhao, Bohua; Wei, Bolei; Wei, Yanxia; Yao, Jinrong; Zhang, Huiliang; Chen, Xin; Shao, Zhengzhong
卷:165
期:Pt A
页:460-471
DOI:10.1016/j.ijbiomac.2020.09.142
出版年:
文献类型:Journal Article
摘要
In this work, a new N-halamine precursor with two epoxy groups, 1,3-bis(2,3-epoxypropyl)-s-triazine-2,4,6-trione (BETT), was synthesized and used to enhance the compatibility between poly(lactic acid) (PLA) and poly (butylene adipate-co-terephthalate) (PBAT). The rheological analysis and GPC indicated that chain extension between PLA and PBAT occurred during the melt-blending in the presence of BETT. The PLA/PBAT chain extensions improved the compatibility between PLA and PBAT and hindered the crystallization of PLA. SEM images showed that PLA/PBAT blend gradually changed from the typical sea-island phase without BETT to a co-continuous structure with increase in amount of BETT. This showed that the interfacial compatibility between PLA and PBAT improved significantly on addition of BETT. Moreover, compared to PLA/PBAT blend, the mechanical properties of PLA/PBAT/BETT blends showed great improvement. Furthermore, the chlorinated PLA/PBAT/BETT sheets displayed excellent antibacterial activities against E. coli (CMCC 44103) and S. aureus (ATCC 6538) cultures, wherein the sheets with 17.5±0.8mug/cm2 of the active chlorine could kill all inoculated bacteria within 30min.
Copyright © 2020. Published by Elsevier B.V.
作者:Zhao, Y (Zhao, Yan)[ 1 ] ; Wei, BL (Wei, Bolei)[ 1 ] ; Wu, M (Wu, Mi)[ 1 ] ; Zhang, HL (Zhang, Huiliang)[ 2 ] ; Yao, JR (Yao, Jinrong)[ 1 ] ; Chen, X (Chen, Xin)[ 1 ] ; Shao, ZZ (Shao, Zhengzhong)[ 1 ]
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DOI:
出版年:
文献类型:Article
摘要
In this work, silica nanoparticles modified with a new N-halamine precursor (EBDMH-SiO2 NPs) were synthesized through immobilization of 3-(4'-epoxyethyl-benzyl)-5,5-dimethylhydantoin (EBDMH) on the surface of amino-functionalized silica NPs. Then, EBDMH-SiO2 NPs and poly(lactic acid) (PLA) were blended at 185 degrees C to prepare a novel environmentally friendly PLA based nanocomposite (PLA/EBDMH-SiO2). The addition of EBDMH-SiO2 NPs has great influences on the thermal properties of nanocomposite. DSC results show that the grass transition temperature (T-g), cold crystallization temperature (T-cc) and melting temperature (T-m) of PLA in nanocomposites gradually decrease with the increase of EBDMH-SiO2 NPs contents up to 5%. After that, further rise in EBDMH-SiO2 NPs content actually increases T-g, T-cc, and T-m. The overall crystallization and spherulite growth rate of PLA show the similar trend. Furthermore, the introduction of EBDMH-SiO2 NPs increases the storage modulus and viscosity of the melt of nanocomposite, providing an additional benefit for PLA blowing and injection molding. After chlorination, the N-halamine precursors on the nanocomposite surfaces are transformed into N-halamines, which provide strong antibacterial activities against E. coli (CMCC 44103) and S. aureus (ATCC 6538), pointing to good potentials of the PLA/EBDMH-SiO2 nanocomposites for antibacterial applications including food packaging, filters, and a wide range of hygienic products. (C) 2019 Elsevier B.V. All rights reserved.
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