title: Poly(3-hydroxybutyrate)/ZnO bionanocomposites with improved mechanical, barrier and antibacterial properties.
abstract: Poly(3-hydroxybutyrate) (PHB)-based bionanocomposites incorporating different contents of ZnO nanoparticles were prepared via solution casting technique. The nanoparticles were dispersed within the biopolymer without the need for surfactants or coupling agents. The morphology, thermal, mechanical, barrier, migration and antibacterial properties of the nanocomposites were investigated. The nanoparticles acted as nucleating agents, increasing the crystallization temperature and the degree of crystallinity of the matrix, and as mass transport barriers, hindering the diffusion of volatiles generated during the decomposition process, leading to higher thermal stability. The Young's modulus, tensile and impact strength of the biopolymer were enhanced by up to 43%, 32% and 26%, respectively, due to the strong matrix-nanofiller interfacial adhesion attained via hydrogen bonding interactions, as revealed by the FT-IR spectra. Moreover, the nanocomposites exhibited reduced water uptake and superior gas and vapour barrier properties compared to neat PHB. They also showed antibacterial activity against both Gram-positive and Gram-negative bacteria, which was progressively improved upon increasing ZnO concentration. The migration levels of PHB/ZnO composites in both non-polar and polar simulants decreased with increasing nanoparticle content, and were well below the current legislative limits for food packaging materials. These biodegradable nanocomposites show great potential as an alternative to synthetic plastic packaging materials especially for use in food and beverage containers and disposable applications.
authors.affiliation: Institute of Polymer Science and Technology (ICTP-CSIC), Juan de la Cierva 3, Madrid 28006, Spain. adiez@ictp.csic.es.
authors.forename: Ana M
authors.initials: AM
authors.lastname: Díez-Pascual
authors.affiliation: Airbus Operations S. L., John Lennon s/n, Getafe, Madrid 28906, Spain. aldiezvicente@gmx.es.
authors.forename: Angel L
authors.initials: AL
authors.lastname: Díez-Vicente
mesh_terms: D000900:Anti-Bacterial Agents / Q000737:chemistry* / Q000494:pharmacology; D003460:Crystallization; D055119:Elastic Modulus; D018857:Food Packaging; D006090:Gram-Negative Bacteria / Q000187:drug effects; D006094:Gram-Positive Bacteria / Q000187:drug effects; D006885:Hydroxybutyrates / Q000737:chemistry*; D053761:Nanocomposites / Q000737:chemistry* / Q000633:toxicity / Q000648:ultrastructure; D044367:Phase Transition; D011091:Polyesters / Q000737:chemistry*; D013696:Temperature; D013718:Tensile Strength; D015034:Zinc Oxide / Q000737:chemistry*; D000094122:Polyhydroxybutyrates
chemical_list: D000900:Anti-Bacterial Agents; D006885:Hydroxybutyrates; D011091:Polyesters; D015034:Zinc Oxide; C003182:poly-beta-hydroxybutyrate; D000094122:Polyhydroxybutyrates