Crystallization Behavior of Poly(ethylene terephthalate) Blended with Hyperbranched Polymers: The Effect of Terminal Groups and Composition of Hyperbranched Polymers

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Jang, Jyongsik; Oh, Joon Hak; Moon, Sung In

Issue Date
American Chemical Society
Macromolecules 2000, 33, 1864-1870
The effects of terminal groups and composition of hyperbranched polymers (HBPs) on the
crystallization behavior of poly(ethylene terephthalate) (PET) in HBP/PET blends were investigated using
in situ FT-IR spectroscopy and differential scanning calorimetry. Hyperbranched aliphatic polyester was
synthesized from an AB2 type monomer and a B3 type core. The hydroxyl terminal groups of the HBP
were transformed into acetate and benzoate groups by organic synthetic methods. The effects of the HBPs
were compared with those of linear polyester (LPE) synthesized from an AB type monomer and a B2 type
core. A small amount of HBP with hydroxyl groups could greatly reduce the relative crystallinity of PET
through hydrogen bonds. HBP with acetate groups showed effects similar to those of LPE. As the
composition of LPE was increased, the relative crystallinity of PET was slightly decreased. On the contrary,
HBP with benzoate groups played the role of nucleating agent in the blends with PET. The crystallization
rate of PET was highest in the blend with 12 wt % HBP. Dynamic viscosity measurements were performed
to investigate the role of the HBPs as processing aids.
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Chemical and Biological Engineering (화학생물공학부)Journal Papers (저널논문_화학생물공학부)
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