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Acrylic Acid Plasma Treatment of Polypropylene Nonwoven Fabric

Buček A., Popelka A., Zahoranová A., Kováčik D., Novák I., Černák M.

Fibres & Textiles in Eastern Europe

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2016

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Vol. 24, no. 6 (120)

161--164

EN

Nowadays hydrogel materials are being used in medical practice for wound dressing purposes. Hydrogel/textile composites can be formed to increase the mechanical strength and handling capability of hydrogel materials. Nonwoven textiles are optional for such applications, however, it is often necessary to improve their surface properties. Here plasma activation/grafting of polypropylene (PP) nonwoven fabric with an acrylate layer to improve its adhesive properties is reported. A diaphragm discharge was used for the plasma treatment of the PP fabric. The discharge was burnt in a solution of acrylic acid (AAc), which resulted in a single step process of plasma activation and plasma grafting of the fabric. Results of wettability testing and ATR-FTIR measurements showed the existence of a thin poly(acrylic acid) (PAAc) layer grafted on the fabric surface. Peel strength measurements showed a 4.7 fold increase in the peel strength when compared with untreated PP fabric.

PL

Współcześnie materiały hydrożelowe używane są w wyrobach medycznych jako opatrunki na rany. Hydrożelowe kompozyty tekstylne formuje się dla zwiększenia mechanicznej wytrzymałości poręczności w stosowaniu. Włókniny są powszechnie stosowane do wyrobów medycznych, jednak jest konieczne polepszenie ich właściwości powierzchniowych. W badaniach zastosowano aktywację plazmową w celu pokrycia włóknin polipropylenowych warstwą akrylową dla polepszenia właściwości adhezyjnych. Wyładowania odbywały się w roztworze kwasu akrylowego co pozwoliło na przeprowadzenie jednostopniowego procesu aktywacji plazmowej. Wyniki pomiarów zwilżalności oraz badania ATR-FTIR wykazały istnienie cienkiej warstwy kwasu poliakrylowego na powierzchni włókniny. Stwierdzono 4.7 razy większą wytrzymałość na odrywanie w stosunku do włóknin niemodyfikowanych.

2

Linking the historical research with the growth simulation model of hardwood floodplain forests

Simon J., Machar I., Buček A.

Polish Journal of Ecology

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2014

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Vol. 62, nr 2

273--288

EN

Hardwood floodplain forests of lowland rivers in the temperate zone of Europe represent important refugia for biota in the cultural landscape. Most of these habitats that are in near natural state are included in the system of protected areas and ecological networks. This paper presents the results of an innovative method for the assessment of hardwood floodplain forest management strategy. This method is based on combining the analysis of historical development of the forest ecosystem with the growth simulation model of the forest. The method allows us to understand (explain) the current state of the hardwood floodplain forest ecosystem and to predict its future development taking into account the applied forest management strategy. Application of this method is promising especially in protected areas because it allows us to assess the suitability of the chosen strategy that is included in the protected area management plan. The research was conducted in the area of ‘Bahna’ in Litovelské Pomoraví protected landscape area (Czech Republic). The current management strategy applied on the hardwood floodplain forest ecosystem in the study site is based on a strict non-intervention protection regime. Historical research of the forest ecosystem showed that the studied floodplain forest habitat is a relic of coppice with standards system and thus is the result of intensive forest management in the past. Growth simulation model showed that in the future 40 years the assessed management strategy will not lead to significant changes in the structure or diversity of the tree layer. Considering the conservation objectives of the reserve (maintenance of biodiversity and the present character of the forest ecosystem dominated by ash and oak), the current management plan does not require any significant corrections. The presented results can be applied in discussions about optimal management strategies in protected areas containing hardwood floodplain forest ecosystems, which belong to priority natural habitat types in the Natura 2000 network.

3

Surface Modification of Polypropylene Nonwoven after Plasma Activation at Atmospheric Pressure

Černáková L., Szabová R., Wolfová M., Buček A., Černák M.

Fibres & Textiles in Eastern Europe

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2007

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Vol. 15, no. 5-6 (64)

121--123

EN

Polypropylene non-woven fabrics were activated by an atmospheric-pressure plasma treatment in ambient air using a novel plasma source. Subsequently, the plasma activated samples were coated by a nanostructured Fe2O3 layer using surfactant-free water dispersion of Fe2O3 nanostructured particles. The surface of the samples was characterised by scanning electron microscopy. The Fe2O3 coating exhibited a remarkable wash resistance.

PL

Polipropylenowe włókniny aktywowano plazmą w powietrzu pod ciśnieniem atmosferycznym za pomocą nowo opracowanego źródła plazmy. Następnie próbki, aktywowane plazmą, pokrywano warstwą Fe2O3 o strukturze nano. Do pokrywania stosowano wolną od surfaktantów zawiesinę nano-cząsteczek Fe2O3. Powierzchnię próbek oceniano za pomocą skaningowego mikroskopu elektronowego. Wytworzone warstwy charakteryzowały się dużą odpornością na pranie.