Czasopismo | INŻYNIERIA MATERIAŁOWA | Rocznik 2012 - zeszyt 6

Study on mechanical, thermal and barrier properties of PET/MMT nanocomposites obtained by in situ polymerization

nr katalogowy: 73482

Poly(ethylene terephthalate) (PET) is of major industrial importance due to its low cost and high performance as well good physical properties. The variety of applications such as in textile fibers, films, bottle containers, food packaging materials, engineering plastics in automobiles, electronics, has been found. However, the disadvantages such as low rate of crystallization, low thermal distortion temperature and low modulus have limited its application as an engineering plastic. One way to enhance its property is to utilize the nanocomposite of PET/layered silicate. Polymer/layered silicate nanocomposites can be produced via three routes, i.e. solution, melt blending and in situ polymerization. Melt blending is an economically favourable process and a few of experiments have demonstrated some success of this process. Solution and in situ polymerization routes are commonly used in research to make nanocomposites, but they are expensive processes. In this paper, the effect of compounding MMT with PET on the thermal stability, mechanical and barrier property of the composite are examined. Organically modified montmorillonite (organo- MMT) is used as the layered clay to prepare polymer/layered silicate nanocomposite in this research because of its wide availability and its easiness to be nanodispersed in the matrix. EXPERIMENTAL Materials Dimethyl terephthalate (DMT), dimethyl isophthalate (DMI) 1,2-ethylene glycol (EG), antimony trioxide (Sb2O3) were purchased from Fluka. Zinc acetate [(CH3CO2)2Zn] (99.99%) was purchased from Sigma-Aldrich. The organoclay Nanofil 32 (Süd-Chemie, Germany) modified by stearylbenzyldimethyl ammonium chloride, with an average particle size of about 20 μm and a weight loss of 35.3 wt % in temperature range 200÷650°C was used as a filler. Synthesis of PET/MMT nanocomposite The synthesis of the poly(ethylene terephthalate)/montmorillonite nanocomposites (PET/MMT) were performed in 1 dm3 stee[...]

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