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THE USE OF ATMOSPHERIC PLASMA TREATMENT TO IMPROVE ADHESIVE PROPERTIES OF BIOPOLYMER JOINTS PLA/PLA FOR INDUSTRY APPLICATIONS

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Author(s): Amparo Jordá Vilaplana | Maria Angeles Bonet Aracil | Lourdes Sánchez Nácher | Matías Monzó Pérez

Journal: Annals of the University of Oradea. Fascicle of Textiles, Leatherwork
ISSN 1843-813X

Volume: XIV;
Issue: 2;
Start page: 164;
Date: 2013;
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Keywords: polylactic acid | adhesive properties | atmospheric plasma | PLA/PLA | wettability | Biodegradable

ABSTRACT
Recently a remarkable growth in the biodegradable polymers applications has been observed in many industrial sectors. This kind of polymers offers a wide variety of properties such a traditional and easy processing conditions, good chemical barrier behaviour, surface finishing versatility, light, etc. What’s more the main property of these polymers is their biodegradability and environmental friendly behaviour. One of the most important commercial biopolymer is polylactic acid or PLA. This is one polyester kind from renewable sources that its produced for anaerobic fermentation of substrates with carbon like glucose, lactose, starch, molasses, etc with microorganisms like lactobacillus bacterium.Despite this, many polymeric materials offer very low surface energy values. So, in order to obtain polymeric joints, these surfaces are characterized by poor wettability properties by their hydrophobic behaviour. Therefore, this effect difficults the deposition of a layer of adhesive on the polymer surface. For solving this real problem we have used a surface treatment with plasma technology because is an environmental friendly technology and promotes high surface energy values on polymer surface, improves wettability property, and their adhesion properties too.In this work we have used atmospheric plasma technology to modify wettability properties of a polylactic acid PLA, and to improve adhesion properties for technical applications.The main aim of this work is to improve surface wettability of a PLA surface using an atmospheric plasma treatment for increasing adhesive strength joints PLA/PLA, using a biodegradable adhesive.Wettability changes on PLA surface have been evaluated using contact angle measurements by means of four test liquids with different polarities, and atomic force microscopy (AFM). Characterization of the PLA/PLA joints with atmospheric plasma treatment with different conditions process has been carried out using mechanical test. The morphologies fracture surfaces have been analyzed by scanning electron microscopy (SEM) to determine the fracture mechanism. The obtained results show that the atmospheric plasma treatment is and effective method that produces an increase of the PLA surface hydrophilic behaviour, improving its adhesive strength joints.
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