6533b7d9fe1ef96bd126d775
RESEARCH PRODUCT
Coffee grounds as filler for pectin: Green composites with competitive performances dependent on the UV irradiation.
Giuseppe LazzaraGiuseppe CavallaroFilippo ParisiVincenzo Alessandro CataldoStefana Miliotosubject
Materials sciencefood.ingredientPolymers and PlasticsPectinUltraviolet RaysComposite numberCoffea02 engineering and technologyDMA010402 general chemistry01 natural sciencesBioplasticViscoelasticityfoodCompetitive performanceUltimate tensile strengthMaterials TestingMaterials Chemistryultraviolet radiation CoffeaCuringElastic characteristicComposite materialReinforced plastics BioplasticFillerCoffee groundSettore CHIM/02 - Chimica Fisicagreen chemistryOrganic Chemistryfood and beveragesGreen Chemistry Technology021001 nanoscience & nanotechnologyPectinElasticity0104 chemical sciencesBioplasticMorphological characteristicUltraviolet RayUV curingUV-curing Composite films pectin chemistryDynamic mechanical testPectinsIrradiationWettingUV-curingBiocomposite0210 nano-technologydescription
Novel composite bioplastics were successfully prepared by filling pectin matrix with treated coffee grounds. The amount of coffee dispersed into the pectin was changed within a wide filler range. The morphology of the pectin/coffee hybrid films was studied by microscopic techniques in order to investigate their mesoscopic structure as well as the sizes distribution of the particles dispersed into the matrix. The micrographs showed that the coffee grounds are uniformly dispersed within the polymeric matrix. The morphological characteristics of the biocomposite films were correlated to their properties, such as wettability, water uptake, thermal behavior and mechanical performances. Dynamic mechanical test were conducted as a function of the humidity conditions. As a general result, a worsening of the mechanical performances was induced by the addition of the coffee grounds into the pectin. An additional UV curing treatment was conducted on the pectin/coffee films with the aim to improve their tensile and viscoelastic features. The cured films showed promising and tunable properties that are dependent on both the filler content and the UV irradiation. In particular, the presence of single coffee particles into the pectin matrix renders the UV curing treatment effective in the enhancement of the elasticity as well as the traction resistance, whereas the cured composite films containing coffee clusters showed only more elastic characteristics. With this study, we fabricated pectin/coffee bioplastics with controlled behavior appealing for specific application within the food packaging. © 2017 Elsevier Ltd
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2017-02-15 | Carbohydrate polymers |