GLİSEROLUN KİTOSAN BAZLI İKİ KATMANLI FİLMLER ÜZERİNE ETKİSİ

Kitosan (CH) filmler, bir plastikleştirici olarak gliserol ile ve gliserolsüz hazırlanmış ve iki katmanlı filmler oluşturmak için polikaprolakton (PCL) ve sikloolefin kopolimer (COC) ile kaplanmıştır. İkinci bir katman olarak PCL ve COC uygulamasının CH filmlerinin fiziko-mekanik özellikleri üzerine etkileri belirlenmiştir. CH film üzerine kaplandığında PCL ve COC film çözeltilerinin yüzey adezyonu temas açısı ile araştırılmıştır. PCL film çözeltilerinin temas açısı COC film çözeltilerinden daha düşük bulunmuştur (P <0.05). Taramalı elektron mikroskopi analizi, CH ve PCL arasında daha iyi bir adezyon olduğunu gösterirken, CH/COC iki katmanlı filmlerde faz ayrımı gözlenmiştir. İki katmanlı filmler, CH filmlere oranla suya karşı daha yüksek direnç gösterirken (P <0.05), iki katmanlı filmlerin mekanik özelliklerinde bir azalma gözlenmiştir. İki katmanlı filmler, tek katmanlı filmler ile benzer optik özellikler göstermiştir (P >0.05). CH filmlerin fizikomekanik özellikleri, gliserol ilavesinden ve ikinci katmanın uygulanmasından önemli ölçüde etkilenmiştir.

Anahtar Kelimeler:

Polikaprolakton, sikloolefin kopolimer, kitosan, iki katmanlı film, gliserol

THE EFFECT OF GLYCEROL ON THE FORMATION OF CHITOSAN/POLYCAPROLACTONE AND CHITOSAN/CYCLOOLEFIN COPOLYMER BILAYER FILMS

Chitosan (CH) films were prepared with/without glycerol as a plasticizer and coated with polycaprolactone (PCL) and cycloolefin copolymer (COC) to form bilayer films. The effect of the second layer coating on the physicomechanical properties of CH films was determined. The adhesion of PCL and COC solutions, when coated on CH film, was investigated by contact angle measurement. The contact angle of PCL film solutions was lower than COC film solutions (P <0.05). Scanning electron microscopy analysis revealed better compatibility between CH and PCL, while a phase separation was observed for CH/COC bilayers. Bilayers showed higher resistance to water when compared to neat CH film samples (P <0.05), while a reduction was found in tensile properties for bilayer films. Bilayer films had similar transmittance values with monolayer films (P >0.05). The physicomechanical properties of CH films significantly influenced by the addition of glycerol and application of the second layer.

Keywords:

Polycaprolactone, cyclo olefin copolymer, chitosan, bilayer film, glycerol,

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