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A Study on Fabrication of Polyester Copolymers (Ⅵ) -Physical Properties of PET/PETG Copolymer Blend by the Drawing Conditions-  

현은재 (영남대학교 응용화학공학부)
이소화 (영남대학교 응용화학공학부)
김기영 (영남대학교 응용화학공학부)
제갈영순 (경일대학교 교양학부)
장상희 (구미 1대학 식품과학과)
Publication Information
Polymer(Korea) / v.26, no.3, 2002 , pp. 335-343 More about this Journal
Abstract
Blend resin (PET/PETG 70/30 blend) of poly (ethylene terephthalate) (PET) and poly (ethylene terephthalate glycol) (PETG) of weight percent 70/30 was prepared by a twin-screw extruder. Undrawn films of the blend and pure PETG were made by melt-press in hot press. Drawn films were made by capillary rheometer. Crystallinity, shrinkage, thermal, dynamic mechanical, and mechanical properties of these blends and PETG drawn films were investigated by wide angle X-ray diffractometer, dry oven, DSC thermal analyzer, and tensile tester. The crystallinity and density of these films increased with increasing draw ratio and draw rate but decreased with increasing draw temperature. The crystallinity and density of the blend films were higher than those of PETG films. The tensile strength and tensile modulus of these drawn alms increased with increasing draw ratio and draw rate but decreased with increasing draw temperature. The tensile strength and tensile modulus of blend films were higher than those of PETG films. Shrinkage of PETG md blend films decreased with draw ratio and draw rate. Shrinkage of undrawn blend film was 600% higher than that of pure PET film.
Keywords
PET/PETG copolymer blend; drawing; density; thermal properties; dynamic mechanical; properties; shrinkage;
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