In this study, zinc oxide (Merck) as inorganic additive and oleic acid (Riedel) as organic
additive were used together to control the crystallization of PCL. The effects of these
additives on the crystal structure, morphology and crystallization kinetics have been
investigated. PCL (Aldrich, Mn:70,000-90,000) composite films prepared by solvent
casting technique. The solvent is selected as dicloromethane (Aldrich). 4.2 g of PCL
was dissolved in 70 cm3
of DCM at room temperature and mixed by a magnetic stirrer.
Then, zinc oxide and oleic acid were added into PCL solution and mixed further for 2
hours. 10 mL of the mixture was poured into a petri dish with 10 cm diameter and it was
waited for 12 hours in a hood to evaporate the solvent from the film. After solvent
evaporated, PCL based composite film was obtained. The crystallinity and morphology
of the prepared composite films characterized by X-Ray Diffractometer (X-Ray) and
Scanning Electron Microscope (SEM). Nucleation and growth kinetics assessed from
heating and cooling rate controlled Differential Scanning Calorimeter (DSC) analysis
results by Avrami model. Figure 1 shows that films with ZnO and oleic acid have pores
with increasing diameter with increasing oleic acid concentration. Figure 2 shows XRD
patterns of 0.1 wt% ZnO doped PCL composite films by increasing oleic acid
concentration.
In this study, zinc oxide (Merck) as inorganic additive and oleic acid (Riedel) as organicadditive were used together to control the crystallization of PCL. The effects of theseadditives on the crystal structure, morphology and crystallization kinetics have beeninvestigated. PCL (Aldrich, Mn:70,000-90,000) composite films prepared by solventcasting technique. The solvent is selected as dicloromethane (Aldrich). 4.2 g of PCLwas dissolved in 70 cm3 of DCM at room temperature and mixed by a magnetic stirrer.Then, zinc oxide and oleic acid were added into PCL solution and mixed further for 2hours. 10 mL of the mixture was poured into a petri dish with 10 cm diameter and it waswaited for 12 hours in a hood to evaporate the solvent from the film. After solventevaporated, PCL based composite film was obtained. The crystallinity and morphologyof the prepared composite films characterized by X-Ray Diffractometer (X-Ray) andScanning Electron Microscope (SEM). Nucleation and growth kinetics assessed fromheating and cooling rate controlled Differential Scanning Calorimeter (DSC) analysisresults by Avrami model. Figure 1 shows that films with ZnO and oleic acid have poreswith increasing diameter with increasing oleic acid concentration. Figure 2 shows XRDpatterns of 0.1 wt% ZnO doped PCL composite films by increasing oleic acidconcentration.
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