SYNOPSISBinary blend of high-density polyethylene ( HDPE ) and linear low-density polyethylene (LLDPE) , prepared by melt mixing in an extruder, in the entire range of blending ratio, is studied for crystallization behavior by differential scanning calorimetry (DSC) and Xray diffraction measurements. Cocrystallization was evident in the entire range of blend composition, from the single-peak character in both DSC crystallization exotherms and meltingendothermsand theX-raydiffractionpeaks.AdetailedanalysisofDSCcrystal1ization exotherms revealed a systematic effect of the addition of LLDPE on nucleation rate and the subsequently developed crystalline morphology, which could be distinguished in the three regions of blending ratio, viz., the "HDPE-rich blend," "LLDPE-rich blend," and the "middle range from 30-70% LLDPE content." Variations in crystallinity, crystallite size, and d spacing are discussed in terms of differences in molecular structure of the components.
Thermal stability of polypropylene and carbon nanofibre composite system has been studied using Thermogravimetric Analysis, Limited Oxygen Index (LOI), Flammability, Calorimetry, and Oxidation Induction Time techniques. Definite improvement in thermo-oxidative stability of the composite system has been observed. Improvement in LOI and a distinct change in the burning characteristics suggest a reduction in potential fire hazards. The nanocomposite system will have enhanced anti-ageing characteristics and require more stringent conditions for the initiation of burning and the ultimate impact of burning will be less.
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