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Research of PET/Montmorillonite Nanocomposites Prepared Under the Domination of Tensile Deformation

Author: WuXiaoHong
Tutor: HeHeZhi；CaiTong
School: South China University of Technology
Course: Mechanical Engineering
Keywords: tensile deformation PET montmorillonite nanocomposites
CLC: TB383.1
Type: Master's thesis
Year: 2011
Downloads: 39
Quote: 0
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Abstract


Poly(ethylene terephthalate)/Montmorillonite(MMT) nanocomposites have remarkable improvements in crystallization rate, mechanical property, gas barrier property and flame retardance. Therefore, more and more attention has been paid to this field. Nanocomposites of montmorillonite-polymer can be obtained by direct polymer melt intercalation where the polymer chains diffuse into the space between the clay galleries. This process can be carried out through a conventional melt-compounding process. The screw plasticating and conveying equipments based on shear rheology are generally adopted in polymer, but it is still hard to get the completely exfoliated layered silicate nanocomposites. Therefore new processing techniques and equipments have attracted increasing attention. Qu Jinping, Professor of South China University of Technology, developed a newly uniaxial vane extruder based on elongational flow field. Material was dominated by tensile deformation behavior during processing. This device has several characteristics, such as short thermo-mechanic process, low energy consuming, high efficiency, broadly material compatibility and small size. It has real meaning to research PET/montmorillonite nanocomposites extruded by this device.In this work, we prepared PET/MMT nanocomposites by vane extruder and twin screw extruder respectively.The results showed that the nanocomposites prepared by vane extruder had a better mechanical properties. Compared with twin screw extruder, flexural strength of the nanocomposites prepared by vane extruder gets an increase of 6.4% when MMT content was 3 wt.%,and when the MMT content was 1.0 wt.%, tensile strength of the nanocomposites increased by 5.4% .Compared with pure PET, its izod impact strength was nearly unchanged,while composites obtained by twin screw extruder have a decrease of 5.8%.According to the XRD spectra and TEM, some conclusions can be drawn as follow: when MMT loading is 1.0 wt.%, most of the montmorillonites in the nanocomposites prepared by vane extruder are exfoliated from the matrix and the clay layers were in a normal distribution with a most probable thickness of less than 20nm and an average interlayer distance of 3.51nm,while the size of intercalation samples produced by twin screw extruder is 20~50nm and 3.39nm.DSC results proved that the nanocomposites have a higher crystallization rate than that of pure PET due to an exfoliated MMT lamellae nucleation effect. The crystallization rate increased with increasing MMT content. TG results showed that the PET/MMT nanocomposites had a lower initial decomposition temperature and a higher fastest decomposition temperature.It was first reported on the study of PET/MMT nanocomposites prepared under the domination of tensile deformation. It was an effective way to increase dispersion and delamination in a process using tensile to generate nanocomposites.

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