• Physical Properties of Ultradrawn Poly(vinylidene fluoride)/Poly(vinyl acetate) Blends
  • Kim BS, Sang YJ
  • 초연신 Poly(vinylidene fluoride)/Poly(vinyl acetate) 블렌드의 물성
  • 김봉식, 상영재
Abstract
Blend films of poly(vinylidene fluoride) and poly(vinyl acetate) with different compositions were prepared by solution casting and quenching in ice water after melt-pressing to obtain amorphous films. Films were drawn by solid state extrusion with capillary rheometer at 70℃. Properties of drawn blend films were investigated by birefringence, differential scanning calorimetry, dynamic mechanical and tensile testing analysis. Crystallinity increased with draw ratio. Magnitude of melting point depression increased with amorphous polymer content and draw ratio. Maximum tensile modulus of 3.34 GPa was obtained at draw ratio of 6 for PVDF/PVAc, 40/60 with high synergistic effect, which is 1.6 times higher than that of PVDF homopolymer.

Poly(vinylidene fluoride) (PVDF)와 poly(vinyl acetate) (PYAc)의 조성을 달리한 용액 주조 블렌드 필름을 만들고 고상압출법으로 70℃에서 연신하였다 각종 연신 PVDF/PVAC 블렌드 필름의 복굴절, 열적, 기계적특성 및 동역학적 특성을 조사하였다. 연신의 증가에 의해서 결정화도는 증가하였지만, 응점강하현상은 연신비와 무정형고분자함량이 증가함에 따라 크게 나타났다. 인장탄성률은 조성비 PVDF/PYAc, 40/60의 연신비 6에서 최대치 3.34GPa을 나타내며 이는 PVAc의 값보다 크고 PVDF의 값보다 1.6배나 큰 값이며 상승효과가 나타났다.

Keywords: PVDF; PVAc; blends; thermal properties; mechanical properties

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This Article

  • 1996; 20(2): 297-304

    Published online Mar 25, 1996