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Crystallization of polycarbonate in solvent/nonsolvent system and its application to high‐density polyethylene composite as a filler
Author(s) -
Hwang Duck Kun,
Lee Heon Sang,
Kim Hyun Jong,
Shul Yong Gun,
Oh Kyeongseok
Publication year - 2014
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.23740
Subject(s) - materials science , high density polyethylene , crystallinity , crystallization , flexural modulus , composite number , composite material , flexural strength , solvent , differential scanning calorimetry , thermal stability , polycarbonate , polyethylene , polymer chemistry , chemical engineering , chemistry , organic chemistry , physics , engineering , thermodynamics
Crystallization of polycarbonate (PC) was attempted by a precipitated method in a ternary system of PC/solvent/nonsolvent. Chloroform was used as a solvent, and isopropanol was used as a nonsolvent. Crystallization of PC was clearly observed as a powdery state when chloroform/isopropanol mixtures were prepared by 68/32 and 61/39 vol%. Crystallinity of PC was evaluated by differential scanning calorimeter and X‐ray diffractometer. As the difference of solubility parameters between PC and binary solvent/nonsolvent mixtures became smaller, the relative crystallinity of PC was increased. The highest degree of PC crystallization was obtained when chloroform/isopropanol was mixed by 61/39 vol%. Subsequently, crystallized PC was used as a filler to high‐density polyethylene (HDPE) composite. HDPE composite incorporated by crystallized PC filler improved its mechanical and thermal properties. Flexural modulus was increased from 620 to 990 N/mm 2 , and flexural strength was increased from 720 to 1080 N/mm 2 . And heat deflection temperature measurement and flammability test supported the enhancement of thermal property when crystallized PC was added to HDPE composite up to 40 wt%. POLYM. ENG. SCI., 54:1893–1899, 2014. © 2013 Society of Plastics Engineers