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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.