Material Corrosion and Protection Key Laboratory of Sichuan Province, School of Materials Science and Engineering, Sichuan University of Science and Engineering, Zigong 643000, People's Republic of China.
Department of Materials and Textiles, Oriental Institute of Technology, Pan-Chiao 22064, Taiwan, Republic of China.
Nanotechnology. 2021 Sep 6;32(48). doi: 10.1088/1361-6528/ac1b52.
A new nanomaterial or nano-filler in the form of multiwalled carbon nanotube-zinc oxide (MWCNT-ZnO) was synthesized for the purpose of modifying poly(butylene adipate-co-terephthalate) (PBAT) and its derivative (modified PBAT or MPBAT) through a melt-blending method (MPBAT was obtained by introducing maleic anhydride groups into PBAT). The effect of the new nano-filler on the properties of resultant nanocomposites was determined from the characterization of mechanical properties, morphology, crystallinity, thermal stability, barrier properties, hydrophilicity, conductivity, antibacterial property, and biodegradability. The results showed that MPBAT nanocomposites had stronger mechanical properties, better barrier properties, and higher electrical conductivity than PBAT nanocomposites. Scanning electron microscopy illustrated that MWCNT-ZnO had better compatibility with MPBAT than with PBAT. At 0.2% MWCNT-ZnO, the MPBAT/MWCNT-ZnO nanocomposite film exhibited the greatest mechanical properties (17.74% increase in tensile strength, 22.17% in yield strength, and 14.29% in elongation at break). When the MWCNT-ZnO content was 0.4%, the nanocomposite film demonstrated the best water vapor barrier ability (an increase of 30.4%). The MPBAT/MWCNT-ZnO film with 0.6% MWCNT-ZnO turned out to have the best oxygen barrier performance (an increase of 130% relative to pure PBAT). It was shown from the results of antibacterial evaluation that the new nanomaterial could impart PBAT and MPBAT with antibacterial activity. The biodegradability tests indicated that an MWCNT-ZnO content of 0.2% could slightly reduce the biodegradability, and when the content was higher than 0.2%, the weight loss rate would increase.
一种新型纳米材料或纳米填充物多壁碳纳米管-氧化锌（MWCNT-ZnO）被合成，目的是通过熔融共混法来修饰聚丁二酸丁二醇酯-己二酸酯（PBAT）及其衍生物（改性 PBAT 或 MPBAT）（MPBAT 是通过在 PBAT 中引入马来酸酐基团获得的）。通过对机械性能、形貌、结晶度、热稳定性、阻隔性能、亲水性、导电性、抗菌性能和可生物降解性的表征，确定了新型纳米填充物对所得纳米复合材料性能的影响。结果表明，MPBAT 纳米复合材料比 PBAT 纳米复合材料具有更强的机械性能、更好的阻隔性能和更高的导电性。扫描电子显微镜表明，MWCNT-ZnO 与 MPBAT 的相容性优于与 PBAT 的相容性。在 0.2%MWCNT-ZnO 时，MPBAT/MWCNT-ZnO 纳米复合材料薄膜表现出最大的机械性能（拉伸强度提高 17.74%，屈服强度提高 22.17%，断裂伸长率提高 14.29%）。当 MWCNT-ZnO 含量为 0.4%时，纳米复合材料薄膜表现出最佳的水蒸气阻隔能力（增加 30.4%）。含有 0.6%MWCNT-ZnO 的 MPBAT/MWCNT-ZnO 薄膜具有最佳的氧气阻隔性能（相对于纯 PBAT 增加 130%）。抗菌评价结果表明，新型纳米材料可以赋予 PBAT 和 MPBAT 抗菌活性。生物降解性测试表明，MWCNT-ZnO 含量为 0.2%时，可轻微降低生物降解性，当含量高于 0.2%时，失重率会增加。
