Structural characteristics and enhanced mechanical and thermal properties of full biodegradable tea polyphenol/poly(3-hydroxybutyrate-co-3-hydroxyvalerate) composite films

Abstract

Recently, bacterial polyester poly(hydroxybutyrateco-hydroxyvalerate) (PHBV) has been arising much attention in the field of biomedical and environmental friendly materials because of its good biocompatibility, biodegradability as well as thermoplastic properties. However, the wide application has been restricted by the poor mechanical properties and narrow processing window [1]. Therefore, a significant amount of work has been devoted to improving mechanical and thermal properties of PHBV via PHBV-based polymer blends and composites [2]. This work mainly covers four aspects: nanoparticles/PHBV composites, traditional petrochemicalbased materials/PHBV composites, biodegradable petrochemical-based polymer/PHBV composites, and bio-based materials/PHBV composites. In nanoparticles/PHBV composites, inorganic nanoparticles mainly include oxide [3], nitride [4], mineralization materials [5,6], carbon materials or minerals [7], and layered double hydroxides [8,9]. Organic nanoparticles mainly include cellulose nanocrystal [10], chitosan nanocrystal and starch nanocrystal [11]. The introduction of nanoparticles is helpful for improving the physical properties and processing properties of PHBV through increasing the nucleation density and decreasing the spherulite size. In petrochemical-based materials/PHBV composites, the additive components consist mainly of non-biodegradable polyolefin [12] Abstract. Full biodegradable poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) composite films were prepared with 5~40 wt% green tea polyphenol (TP) as toughener. The effects of mixing TP on mechanical properties, thermal properties and hydrophilic-hydrophobic properties of composite films were investigated. Tension test results show that the incorporation of TP in the PHBV matrix can enhance the toughness of the composite films. Differential scanning calorimetric (DSC) studies show that there is a single glass transition temperature and the lower melting point temperature. Fourier transform infrared (FT-IR) results confirm that the intermolecular hydrogen bonding interactions in composite films. Contact angle measurements show that the hydrophilicity of TP/PHBV composite films can be controlled through adjusting the composition of TP.

Natural polyphenol tannic acid reinforced poly(3‐hydroxybutyrate‐co‐3‐hydroxyvalerate) composite films with enhanced tensile strength and fracture toughness

“…The blends have 440% higher impact resistance and only 50% loss in modulus compared with virgin PHB [20]. The effects of green tea polyphenol (TP) on PHBV were also reported by our group [21]. Compared with neat PHBV, the elongation at break increased by 24 times, meanwhile, the glass transition temperature and cold crystallization peak temperature both increased by almost 45 C, respectively.…”

“…The effects of temperature on intermolecular interaction of samples were carried out by FTIR with heating accessory. The spectrum of the samples was obtained in the region from 4000 to 500 cm 21 . The sample temperature were raised with an increment of 10 C at a rate of 2 C/min and kept at each temperature for 5 min before the IR measurement for 4 min [23].…”

Preparation and Characterization of Poly(3-hydroxybutyrate-co-3-hydroxyvalerate)/Graphene Nanocomposites

“…For pure PHBV, it shows its own characteristic absorp- . The absorption band at 1725 cm -1 is due to the C=O stretching in PHBV [15].…”

PCL/PHBV blended three dimensional scaffolds fabricated by fused deposition modeling and responses of chondrocytes to the scaffolds

“…PCL is a biocompatible, biodegradable, flexible, and readily processable semicrystalline linear polyester, while PHBV, a copolymer of 3-hydroxybutanoic acid and 3-hydroxypentanoic acid, possesses good biodegradability, biocompatibility, and thermoplastic properties, but narrow thermal processing window and brittleness. 27 These two polyesters were initially blended at different weight ratios and subsequently fabricated by FDM into 3D scaffolds. The resulting highly porous scaffolds were subsequently subjected to oxygen (O 2 ) plasma treatment to increase their surface hydrophilicity and roughness.…”