Nonisothermal crystallization behaviors of nanocomposites prepared by in situ polymerization of high-density polyethylene on multiwalled carbon nanotubes
- Nonisothermal crystallization behaviors of nanocomposites prepared by in situ polymerization of high-density polyethylene on multiwalled carbon nanotubes
- 김지헌; 곽순종; 홍순만; 이재락; Atsushi Takahara; 서용석
- polyethylene; carbon nanotube; in situ polymerization; nanocomposite; crystallization
- Issue Date
- VOL 43, NO 24, 10545-10553
- Thermal properties and nonisothermal crystallization kinetics of polyolefin nanocomposites
(high-density polyethylene/multiwalled carbon nanotubes) were characterized by differential scanning
calorimetry and thermogravimetric analysis. In situ metallocence polymerization was used to prepare
nanocomposites of multiwalled carbon nanotubes (MWCNTs) and high-density polyethylene (HDPE).
This polymerization method consists of attaching a metallocene catalyst complex onto the surface of the
MWCNTsfollowed by surface-initiated polymerization to generate polymer brushes on the surface.Akinetic
equation for the nonisothermal crystallization was employed to analyze the crystallization characteristics of
the nanocomposites. The Avramic exponent, n, can be reasonably well determined from the nonisothermal
crystallization exotherm. The polarized optical microscopy showed that neat polyethylene possessed a welldeveloped
spherulite morphology, whereas the nanocomposites displayed elongated entities that subsequently
developed as bundlelike entities. Nonisothermal analysis implicitly provides clues about the
morphological development history and HDPE molecular ordering around the carbon nanotubes.
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