Textile Science and Engineering (한국섬유공학회지)

The Korean Fiber Society (한국섬유공학회)
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Phase Coarsening in Polycarbonate and Amorphous Copolyester Blends

폴리카보네이트/무정형 코폴리에스터 블렌드의 상거동

  • Woo, In Seob (Department of Chemical Engineering, Chonnam National University) ;
  • Park, Eun Ju (Department of Chemical Engineering, Chonnam National University) ;
  • Lee, Moo Sung (Department of Chemical Engineering, Chonnam National University) ;
  • Lim, Dae Young (Department of Convergent Textile Technology, KITECH)
  • Received : 2020.06.25
  • Accepted : 2020.07.29
  • Published : 2020.08.31
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Abstract

Phase behaviors of the blends of bisphenol A polycarbonate (PC), copolyesters (TR) of 1,4-cyclohexanedimethanol (CHDM), and 2,2,4,4-tetramethyl-1,3-cyclobutanediol (CBDO) with terephthalic acid were investigated through dynamic mechanical analysis, differential scanning calorimetry, and scanning electron microscopy. When the blends were prepared using an internal mixer at low shear condition, TR-1 with a CBDO content of 27 mol% exhibited miscibility with the PC in the melt-mixed state, whereas TR-2, with a CBDO content of 38 mol% did not. However, a 50/50 PC/TR-2 blend prepared using a twin-screw extruder subjected to high shear rates formed a single phase. Its morphology became a modulated structure and returned to the homogeneous phase during thermal annealing at the melt-mixing temperature. This morphological change is likely owing to shear-induced mixing and ester-carbonate intermolecular exchange during annealing, although no new peaks caused by the exchange reaction were observed in the 1H-NMR spectrum. The effect of CBDO content on the miscibility of PC/TR blends were interpreted in through a binary interaction model. The blends prepared in this study exhibited a transparency close to 90%, a refractive index ranging between 1.550 and 1.586, Tg in the range of 110 to 145 ℃ and a positive birefringence in its stretched state. The PC/TR blends prepared in this study are expected to be used as matrices for PEN fiber-impregnated reflective polarizing sheets or retardation films.

Keywords

Acknowledgement

본 연구는 산업통상자원부의 소재원천기술개발사업(과제번호 10037191)의 지원에 의해 수행되었음.

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