Melting, crystallization and optical behaviors of poly (ethylene terephthalate)-silica/polystyrene nanocomposite films
作者：Tianbin Wu， Yangchuan Ke
關(guān)鍵字：Annealing，Double melting peaks， Nucleation，Poly (ethylene terephthalate)，Scanning electron microscopy
論文來源：期刊
具體來源：Thin Solid Films
發(fā)表時(shí)間：2007年
Poly (ethylene terephthalate) (PET)-silica (SiO2)/polystyrene (PS) nanocomposite films were prepared by melting PET with the core-shell SiO2/PS nanoparticles. Differential scanning calorimetry (DSC) results showed that the crystallization temperature of PET-SiO2/PS nanocomposite films with 2 wt.% PS-encapsulated SiO2 nanoparticles reached 205.1 °C, 11.6 °C higher than that of PET. For crystallized PET-SiO2/PS nanocomposite films, double melting peaks appeared in DSC curves similar to PET. Scanning electron microscopy revealed a netlike fibre morphology for the amorphous PET-SiO2/PS nanocomposite films with 2 wt.% PS-encapsulated SiO2 nanoparticles. The light transmittance of these amorphous PET-SiO2/PS nanocomposite films reached 87.9%, compared to 84.2% for PET. With the increase of annealing temperature from 110 to 150 °C, the transmittance of PET-SiO2/PS nanocomposite films decreased slowly from 69.9 to 46.9%, while their haziness increased slightly from 45.8 to 48.2%. All these phenomena are suggested to result from the strongly heterogeneous nucleation of PS-encapsulated SiO2 nanoparticles in PET.