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Effect of surfactant and orgnoclay loading on mechanical and gas barrier properties of evoh/clay nanocomposite films |
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| รหัสดีโอไอ | |
| Title | Effect of surfactant and orgnoclay loading on mechanical and gas barrier properties of evoh/clay nanocomposite films |
| Creator | Khamkaew Photyotin |
| Contributor | Anongnat Somwangthanaroj, Sarintorn Limpanart |
| Publisher | Chulalongkorn University |
| Publication Year | 2549 |
| Keyword | Nanocomposites (Materials), Copolymers, Surface active agents, Clay |
| Abstract | Nanocomposite films exhibit good gas barrier properties, compared to pure polymer because the pathway of oxygen is obstructed by silicate layers of clay dispersed in polymer matrix. Consequently, nanocomposite films could be used in packaging application. In this study, EVOH/clay nanocomposite films were prepared via twin screw extruder attached to blown film die in order to study the mechanical, thermal and gas barrier properties by varying types of surfactant and the amount of organoclay loading. The number of carbon atoms in alkyl chain and the number of oxyethylene groups of surfactant structures had an influence on clay dispersion in EVOH matrix. Six surfactants, which were used in this study, were divided into 3 groups, i.e.,short (C12) and long (C18) alkyl tail surfactant groups, one and two alkly tail surfactant groups and 2 and 15 repeating units of oxyethylene surfactant groups. Nanocomposite films, containing long alkyl chain or more repeating units of oxyethylene, showed higher tensile strength and tensile modulus than those with short alkyl chain surfactant. However, nanocomposite films containing both kinds of surfactants exhibited similar thermal properties. Nanocomposite films containing one alkyl tail surfactant showed higher tensile strength, tensile modulus and elongation at break than those with two alkyl tail surfactant. In addition, nanocomposites with one alkyl tail surfactant showed slightly higher melting temperature than those with two alkyl tails surfactant. The gas barrier property of EVOH/clay nanocomposite films slightly decreased compared to pure EVOH film except nanocomposite film with two alkyl tail surfactant (increased 2.59%). EVOH/clay nanocomposite films containing 3 wt% MMT_T organoclay showed the higher tensile strength and tensile modulus. In addition, the nanocomposite films containing 1 wt% MMT_T organoclay showed the highest elongation at break but it was only 4.88% better than those containing 3 wt% MM_T organoclay. |
| URL Website | cuir.car.chula.ac.th |
