8 research outputs found

    Bioderadation of multilayer packaging Tetra-Pack

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    Badano rozk艂ad wielowarstwowego opakowania Tetra-Pack przez zesp贸艂 mikroorganizm贸w mezofilnych. Biodegradacj臋 prowadzono w warunkach modelowych, w naturalnym 艣rodowisku glebowym, a tak偶e w glebie wzbogaconej w mieszanin臋 wyselekcjonowanych drobnoustroj贸w. Stwierdzono, 偶e w grupie drobnoustroj贸w degraduj膮cych opakowanie dominuj膮 bakterie Bacillus coagulans i ple艣nie Aspergillus niger. Efekty biodegradacji by艂y wzmocnione przez dost臋p drobnoustroj贸w do warstwy celulozowej opakowania oraz wzbogacenie gleby w aktywne mikroorganizmy amylolityczne i celulolityczne.Decomposition of multilayer Tetra-Pack packaging by of mesophilic microorganisms was investigated. Biodegradation was carried out under model conditions, in the natural soil environment and also in the soil enriched with the mixture of selected microorganisms. It was found out that among the microorganisms able to degrade the packaging the most numerous are Bacillus coagulans and Aspergillus niger. Biodegradation effects were strengthtened due to microorganisms accessibility to the cellulose layer of the packaging and also due to soi I enriching with the active amylolytic and cellulolytic microorganisms

    Primary investigation of the role of starch in biodegradable poliolefins blends

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    Mieszaniny polietylenu ma艂ej g臋sto艣ci (LOPE) i kopolimeru etylenu z kwasem akrylowym (EAA) z udzia艂em skrobi ziemniaczanej 6-20% otrzymywano metod膮 reaktywnego wyt艂aczania w dwu艣limakowej wyt艂aczarce ZE-25x33D (D = 25 mm, L = 33D). Oznaczono w艂a艣ciwo艣ci mechaniczne przy statycznym rozci膮ganiu, twardo艣膰 oraz masowy wska藕nik szybko艣ci p艂yni臋cia (MFR). Mieszaniny charakteryzowa艂y si臋 podobn膮 wytrzyma艂o艣ci膮 na rozci膮ganie do wytrzyma艂o艣ci czystego polietylenu. Natomiast elastyczno艣膰 mala艂a wraz ze wzrostem zawarto艣ci skrobi w mieszaninie. Pr贸bki PE oraz mieszaniny PE/EAA ze skrobi膮 badano metodami SEM i DSC. Okre艣lono spos贸b rozmieszczenia ziaren skrobi w tworzywie syntetycznym oraz jej wp艂yw na w艂a艣ciwo艣ci termiczne tego tworzywa.Potatoe starch was reactive blended with low density polyethylene homopolymer (LOPE) and poly(ethylene-co-acrylic acid) (EAA) using twin-screw extruder ZE-25x33D (D=25 mm, L=33D). The concentration of starch in the blend was varied between 6 and 20% by weight. The static tensile mechanical properties, hardness and melt flow index (MFR) were determined. Blends and pure polyethylene have similar tensile strength. Whereas, as the percentage of starch in the blend is increased, the elasticity decreases. The samples of PE and PE/EAA + starch blends were studied by SEM and DSC methods. An arrangement of starch grains in synthetic materia艂 was determined, and also the eff ect of grains on thermal properties of the material

    Size Exclusion Chromatography and Related Separation Techniques

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