Blends of poly (vinyl chloride) (PVC) and acrylonitrile‐butadiene styrene (ABS) terpolymer were prepared in different ratios by a melt blending technique. ABS containing three different levels of rubber content were used. A quantitative assessment of ABS in PVC/ABS blends has been shown by infrared studies. ABS content has been shown as the presence of the characteristic acrylonitrile peak. Differential scanning calorimetry (DSC) studies have been carried out to study the glass transition (Tg) behavior of the blends. Two Tg values corresponding to PVC and styrene‐acrylonitrile (SAN) copolymer have been observed. Thermogravimetric analysis (TGA) reveals a significant improvement in thermal stability of these blends as compared to PVC. Mechanical properties show a significant increase in the impact strength which is related to rubber content of the ABS used. Morphological studies have been carried out by scanning electron microscopy which support the observation that an increase in rubber content results in greater ductility.
The photo-oxidative degradation of the blends of polypropylene (PP) with metallocene linear low density polyethylene (mLLDPE) were studied. The blend samples were exposed to the ultraviolet radiation (UV) for a period of 6 weeks. Tensile mechanical characteristics were derived from stress-strain curves. The changes in crystallinity during exposure were followed by X-ray diffraction (XRD) and differential scanning calorimetry (DSC), whereas the chemical degradation of the blend samples was evaluated by FTIR-ATR. In case of PP, tremendous decrease is observed in tensile strength, elongation at break, and increase is observed in tensile modulus with exposure time. However, with the addition of mLLDPE, UV stability of PP has significantly improved. A significant increase in crystallinity during UV exposure was noted for PP, whereas for PP/mLLDPE (80/20) blend system the crystallinity did not change much. Therefore low level of stabilizers may be required for PP/mLLDPE blend systems.2007 Wiley Periodicals, Inc. J Appl Polym Sci 106: [917][918][919][920][921][922][923][924][925] 2007
The mechanical properties, melting, and crystallization behavior of a series of blends of polypropylene (PP) with varying percentages of linear low density polyethylene (LLDPE) copolymer and different fraction of glass fibers were investigated. In mechanical properties tensile and flexural strength, tensile and flexural modulus tends to decrease with increasing percentage of LLDPE copolymer, while a tremendous increase is observed in elongation at break. However, addition of glass fiber results in an increase in both tensile, flexural REPRINTS strength and modulus, especially at 30% glass fiber, where a manifold increase is observed, thereby, reversing the trend of decrease in the tensile properties on incorporation of elastomer. Differential scanning calorimetry (DSC) and X-ray diffraction (XRD) data reveals the decrease in crystallinity and crystallite size distribution on increasing % of LLDPE copolymer and glass fiber in the unfilled and glass-fiber-filled blend.
SynopsisThe effect of blending various methacrylate copolymers on the physical and mechanical properties of poly(viny1 chloride) (PVC) has been investigated. Copolymers of methylmethacrylate with methylacrylate, ethyl acrylate, butyl acrylate, and 2-ethylhexyl acrylate in 80 : 20 and 50 : 50 wrt methylmethacrylate have been prepared and characterized by nuclear magnetic resonance spectroscopy. Polyblends of PVC and such polyacrylates have been prepared in 80 : 20 ratio by melt blending technique and characterized by thermomechanical analysis to study the glass transition behavior v i s -h i s the compatibility of these blends. Mechanical properties of these blends revealed a substantial increase in impact strength particularly when long chain acrylate polymers like butyl acrylate and 2-ethyl hexyl acrylates are used; however, there is a decrease in the yield stress and initial modulus. A shift from brittle failure to ductility has been observed in blends of PVC on incorporation of these acrylate copolymers. Scanning electron microscopic studies have been carried out to support these observations.
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