RT Journal Article
T1 Polydopamine surface functionalized submicron ZnO for broadening the processing window of 3D printable PLA composites
A1 Yang, Xiao-Mei
A1 Yin, Guang-Zhong
A1 Zafra Amorós, Olga
A1 Arroyo Hernández, María
A1 La Vega, Jimena de
A1 Torralba Castelló, José Manuel
AB The “catalytic degradation” of metal oxides limits the wide application of PLA when PLA needs to be modified by adding metal oxides to achieve desired properties. Zinc oxide (ZnO) is a common and widely used agent as it can be used for many properties, such as antioxidant, antibacterial, etc. However, detrimental effects often exist on the properties of polymers after introducing the ZnO, due to the catalytic degradation. In this study, we used polydopamine (PDA) to construct ZnO@PDA core-shell submicron particles via the self-polymerization of dopamine (DA) in alkaline solution, aimed to produce a surface functionalization that would be used to control the rate of degradation of PLA by ZnO during thermal processing, and promote the preservation of mechanical properties. PLA with different contents of ZnO and ZnO@PDA were prepared by a simple melt extrusion method. The degradation behavior, mechanical properties and antibacterial activity of ZnO/PLA and ZnO@PDA/PLA were investigated. It was found that the incorporation of ZnO@PDA in PLA at different contents exhibits a dramatic control over the degradation rate when compared to that of the ZnO/PLA with the same filler content. Notably, the T5% and T50% of 3%-ZnO@PDA/PLA increased by 36.4 oC and 31.9 oC. GPC results showed the molecular weight of 3%-ZnO@PDA/PLA was only reduced by 15.8% after thermal processing. In addition, 3%-ZnO@PDA/PLA can be 3D-printed smoothly. That is to say, the introduction of ZnO@PDA can increase the processing window of PLA/ZnO composites, providing the possibility for materials that need to be included in civil application. Accordingly, ZnO@PDA/PLA samples showed higher tensile strength and elongation at break than that of corresponding ZnO/PLA samples. Regarding the antibacterial behavior, the ZnO@PDA/PLA have more bacterial growth disability effect against Gram(+) bacteria than that of pure PLA.
PB Springer
SN 1022-9760
YR 2023
FD 2023-05
LK https://hdl.handle.net/10016/37241
UL https://hdl.handle.net/10016/37241
LA eng
NO This publication is funded through the project "MAMAP - Materials and models against pandemics" (REACT-EU resources of the Madrid Operational Program 2014-2020, in the action line of R+D+i projects in response to COVID-19). Project funded by the Community of Madrid and by the European Regional Development Fund of the European Union "A way to make Europe". Financed as part of the Union's response to the COVID-19 pandemic, through the agreement signed between the Community of Madrid (Regional Ministry of Education, Universities, Science, and Spokesperson) and the IMDEA Materials Foundation for the direct granting of a grant of 1.937.000.00 euros to fund research activities on SARS-COV 2 and the COVID-19 disease funded with REACT-EU resources from the European Regional Development Fund.
DS e-Archivo
RD 1 sept. 2024