Bugaj, Peter

Jakubíková, Zuzana

Koštial, Pavol

Skalková, Petra

Sroková, Iva

English

DSpace at VSB Technical University of Ostrava

I Sborník vědeckých prací Vysoké školy báňské - Technické univerzity Ostrava číslo 1, rok 2009, ročmlc Lil, řada hutnická článek č. 1442 EFFECT OF PLASTIFICATOR AND COMPATIBILIZER ON PROPERTIES OF PCL/HEC BLENDS Z. JAKUBÍKOVÁ", I. SROKOVÁ1 , P. BUGAJ2, P. SKALKOVN, P. KOŠTIAL1 1 Faculty of lndustrial Technologies, Dubfek University of TrenBn; Púchov, Slovak RepubUc, contact 1111thor:jakubikova@lpttnuni.sk 1 Faculty of Chemical and Food Technology STU; Bratislava, Slovak RepublicABSTRACT: New type of polymer blends composed of polycaprolactone (PCL), hydroxyl­ethylcellulose (HEC) plasticized with 30 and 50 % of glycerol, and poly(ethylene-co-acrylic) acid (EAA) as a compatibilizer, was prepared. Double-screw extruder tempered on }Yorking temperature was used for blends preparation. Achieved product was granulated and films were casted subsequently by using Chill Roll technology. The morphology of PCL/HEC blends was studied by scanning electron microscopy. The mechanical properties were investigated and the tensile strength and relative elongation at break were evaluated from the stress-strain curve. The compatibility of HEC with PCL was significantly improved by addition of poly(ethylene-co­acrylic) acid (EAA) and glycerine mixed into master-batch of investigated system. 1t was found, that the presence of EAA copolymer makes the PCL/HEC blends more homogeneous. Physicp-mechanical properties of prepared blends are comparable with most wide-spread polyolefines and might be exploited in various technical applications. KEY WORDS: Polycaprolactone, hydroxyethyl cellulose, poly(ethylene-co-acrylic) acid, blends, glycerol 1. INTRODUCTIONBiodegradable polymers and plastics are materials that completely degrade by microbial attack under appropriate environmental conditions. Generally these materials a:re more expensive than commodity plastics but they are more environment-friendly and better suited for a number of applications such as shopping bags, food-service packaging, agricultural mulch film, and niedical disposables [l] that, once abandoned in terrestrial and marine environments, should break down and ultimately be mineralized by microbial attack. In recent years, inéreasing concem about environmental issues has renewed great interest in the development of the biodegradable materials. Polysaccharides have been considered as a candidate material in certain thermoplastic· applications because of their known biodegradability, availability and low cost. Physical incorporation of natural polymers such as starch and cellulose in synthetic polymers can be used to improve the biodegradability of the polymer matrix, often being recalcitrant to microbial attack. When disposed of, the poly(saccharide) is biodegraded, leaving the plastic porous and susceptible to further oxidative degradation. However, it is found that 30-50 % of natural biodegradable polymers are required to achieve significant biodegradation [2]. Cellulose esters and ethers, having degree of substitution (DS) between 1.7 and 3.0, c� be easily obtained from native cellulose or recycled paper. These materials have mechanical properties 74 

Effect of plastificator and compatibilizer on properties of PCL/HEC blends

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Effect of plastificator and compatibilizer on properties of PCL/HEC blends

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