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Barrier Properties and Thermal Stability of Polymer Blend and Polymer-Silicate Nanocomposite (High Density Polyethylene & Polyamide)

Yuhana, Nor Yuliana (2002) Barrier Properties and Thermal Stability of Polymer Blend and Polymer-Silicate Nanocomposite (High Density Polyethylene & Polyamide). Masters thesis, Universiti Teknologi Petronas.

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The present work attempts to obtain better understanding on the barrier properties and thermal stability of polymer blend and polymer-silicate nanocomposite. Barrier property to hydrocarbon (Toluene), gases (Oxygen) and water have been done on HDPE, PA 66 and PA 6 polymers, for their blends and nanocomposite (Cloisite 30B and Nanomer 1.30 TC). Also the thermal stability of polymeric nanocomposite, P A 6 and HDPE with Nanomer 1.30TC have been analysed to see the change in thermal decomposition, compare to pure polymer. Blending of two polymers HDPE/P A (80:20 % wt) shows changing in barrier property of polymer matrix HDPE, while it still has a dominant effect on the property. Addition of compatibilizer (MPE) to the blend would homogeneously disperse the PA particles in the matrix, and resulting and improved barrier property to hydrocarbon than that of pure HDPE, i.e. Toluene permeability in the blend of HDPE/P A 66 in the absence of compatibilizer is reduced by 2 times, and in the presence of compatibilizer, the permeability is reduced by 6 times. Different type of polymer-silicate nanocomposite processing does give influence on the composite performance i.e. delamination and dispersion of clays in the polymer matrix. PA 66 nanocomposite (Cloisite 30B) 5%wt is prepared by two different method of processing: (A) slit-die twin-screw extrusion and (B) slit-die twin screw extrusion, followed by compression molding. The barrier property of P A 66 nanocomposite produced by type (B) process shows an improved in barrier property to oxygen than that of pure P A 66, i.e. Oxygen permeability in the P A 66 nanocomposite is reduced by 2 times for processing type (A) and reduced to about 3 times for processing type (B). Besides processing type and condition, the choice of clays for polymer are also important for achieving good delamination and dispersion i.e. barrier property of P A against water are reduced gradually by increasing the amount of Cloisite 30B in the composite. However for HDPE, with the Cloisite 30B, the opposite trend was observed. The thermal stability of polymer silicate-nanocomposite could be influenced by two factors: thermal stability of onium ion and clay loading. At higher clay loading (10% wt), it is observed that polymer thermal degradation start at higher temperature compare to that of pure polymer. 4 permeability models are used to compare the selected experimental results for Toluene and Oxygen Experiment: Series and Maxwell for blend system, Cussler and Bharadwaj for polymer-silicate nanocomposite. It could be observed that for HDPE/P A 66 blend, in the presence of compatibilizer, Series Model give the closer value to the experimental result. Bharadwaj model tracks very well the experimental result for P A 66 nanocomposite, the model predict the permeability by considering the orientational order of clays in the polymer.

Item Type: Thesis (Masters)
Academic Subject : Academic Department - Mechanical Engineering - Materials - Advanced engineering materials - Processings and applications of polymers
Subject: T Technology > TJ Mechanical engineering and machinery
T Technology > TP Chemical technology
Divisions: Engineering > Chemical
Depositing User: Users 2053 not found.
Date Deposited: 30 Sep 2013 16:55
Last Modified: 25 Jan 2017 09:47
URI: http://utpedia.utp.edu.my/id/eprint/7842

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