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Characteristics of PET-PEN Copolymer as a Material for Flexible Substrate  

Youm, Joo-Sun (Center for Photofunctional Energy Materials, Dept. of Polymer Science and Engineering, Dankook University)
Kim, Jea-Hyun (Center for Photofunctional Energy Materials, Dept. of Polymer Science and Engineering, Dankook University)
Kang, Ho-Jong (Center for Photofunctional Energy Materials, Dept. of Polymer Science and Engineering, Dankook University)
Publication Information
Polymer(Korea) / v.35, no.6, 2011 , pp. 599-604 More about this Journal
Abstract
The PET-PEN copolymers have been synthesized and the effect of their morphology on the physical properties of polyester flexible substrate was investigated. It was found that the block sequence of synthesized copolymer was varied depending upon DMT/NDC ratio in polymerization. Higher PET-PEN and PEN block sequence in polyester copolymer resulted in the increase of glass transition temperature and it caused the enhancement of dimensional stability as a polyester flexible substrate. The highest coefficient of thermal expansion(CTE) was obtained when DMT/NDC ratio is 50/50. Synthesized PET-PEN copolymer seems to be acceptable as a flexible substrate since it shows that their optical transmittance at 550 nm is over 80% and thermal weight loss at $280^{\circ}C$ for 1 hr is less than 0.4 wt%.
Keywords
poly(ethylene terephthalate)/poly(ethylene naphthalate) copolymer; copolymer block sequence; glass transition temperature; flexible substrate; coefficient of thermal expansion;
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