Abstract
Polychloroprene and polyacrylamide form a self-crosslinking blend during mixing and moulding in the temperature range 140 to 190°C and mis inter-crosslinking is revealed by a torque rise in the rheometric studies. The nature of the stress-strain curves of the blend indicates the generation of a bonded structure where one soft matrix is bonded with a rigid phase and the bonding fails after a critical loading. The results of hysteresis measurements are in agreement with a bonded structure. The SEM study shows that the majority of the polyacrylamide particles are covered with a layer of rubber matrix. It also shows the distribution of particles and the extent of breakdown of the particles in various blends. The SEM observations are also in line with interfacial bonding and help in understanding the physical properties of various blends based on the extent of inter-crosslinking reaction.
Thermogravimetric analysis of aqueous solutions, cast film, and dry powdered of polyacrylamide confirms the role of moisture in polyacrylamide degradation. It also confirms that although polychloroprene imparts some water resistance to the polyacrylamide component, it still remains degradable by water.
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