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Crystallization behavior of high‐density polyethylene/linear low‐density polyethylene blend
Author(s) -
Gupta A. K.,
Rana S. K.,
Deopura B. L.
Publication year - 1992
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1992.070440418
Subject(s) - linear low density polyethylene , materials science , crystallization , differential scanning calorimetry , crystallinity , high density polyethylene , polyethylene , nucleation , crystallite , composite material , polymer blend , polymer chemistry , chemical engineering , polymer , thermodynamics , chemistry , organic chemistry , copolymer , engineering , metallurgy , physics
Abstract Binary 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 X‐ray diffraction measurements. Cocrystallization was evident in the entire range of blend composition, from the single‐peak character in both DSC crystallization exotherms and meltingendotherms and the X‐ray diffraction peaks. A detailed analysis of DSC crystallization 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.