This work investigates the possibility of reducing the permeability of polystyrene by adding small amounts of a liquid-crystalline azo compound, 2,3-dimethyl-4-n-butyl-4-(4"-methoxybenzoyloxy)azobenzene (BMA). Addition of BMA to polystyrene can lead to either an increase or a decrease in permeability depending on the effects of BMA concentration and casting conditions on the film morphology. The film morphologies were characterized by polarized light microscopy, wide-angle X-ray diffraction and differential scanning calorimetry; following which the permeability of H2, N2, CO2 and water vapour were measured. Relative to polystyrene, 30-40% decrease in the composite permeability can be achieved with only 2% BMA loading. This decrease is due to the 'antiplasticization' effect of BMA on polystyrene.
Посилання на статтю:
Modification of polystyrene barrier properties / B. G. Pant, S. S. Kulkarni*, D. G. Panse and S. G. Joshi // Polymer. – 1994. – Vol 35. – P. 2549-2553.