Polyester Elastomer/PMMA 블렌드의 물성

황석호; 정재창; 이영철; 이상원; 임일웅

Polymer(Korea), Vol.22, No.4, 603-610, July, 1998

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Polyester Elastomer/PMMA 블렌드의 물성

Physical Properties of Polyester Elastomer/PMMA Blends

황석호, 정재창, 이영철, 이상원, 임일웅

초록

Polyester elastomer(PEL)와 poly(methyl methacrylate)(PMMA)를 용융블렌딩 방법으로 PEL/PMMA 블렌드를 제조하였으며, 이에 대한 열적, 기계적, 형태학적, 유변학적 성질을 관찰하였다. 블렌드의 전조성에서 PMMA의 T_g가 100℃부근에서 관찰되었으며, 블렌드내 PEL의 용융온도는 전조성에서 변화가 없었다. 또한 용융엔탈피값은 PMMA함량이 증가함에 따라 거의 선형적으로 감소하였다. 반면 블렌드의 밀도는 PMMA의 함량에 비례하여 선형적인 증가를 보여주었다. PMMA함량이 20wt%이상일 경우, 블렌드의 elongation-at-break는 급격한 감소를 보여주었고, 블렌드의 Young's modulus와 인장강도 값은 직선에서 아래로 일탈하는 전형적인 비상용성 블렌드계 경향을 보여주었다. RMS를 이용하여 블렌드의 유변학적 물성을 측정한 결과, 블렌드의 저장탄성율과 손실탄성율, 복합점도의 거동이 매트릭스내 분산상들이 구형으로 잘 분산되어 있음을 나타내었으며, SEM을 사용한 블렌드의 파단면 관찰도 유변학적 물성이 나타내는 결과와 동일하게 고분자 매트릭스내에서 구형의 분산상을 확인할 수 있었다.

The thermal, mechanical, morphological and rheological properties of the polyester elastomer blended with poly(methyl methacrylate) by melt blending were investigated. The miscibility of PEL/PMMA blends were characterized by glass transition temperatures and the maximum melting temperature of the blends in all compositions. The maximum melting temperature of PEL in the blends remains nearly constant. Heat of fusion of blends decreased linealy with increasing the fraction of PMMA, however, the density of the blends increased linealy with increasing the fraction of PMMA. When the PMMA contents was higher than 20 wt%, elongation-at-break of blends decreased drastically. Young's modulus and tensile strength of the blends showed a minor deviation from the straight line which is a typical trend of incompatible polymer blend systems. In the rheological properties characterized by RMS, the loss modulus, storage modulus, and complex viscosity of blends indicated that well dispersed spherical domains were formed in the matrix, which was also confirmed by SEM examination.

Keywords:Blend;Polyester elastomer;Poly(methyl methacrylate);Physical properties;Rheological properties

[References]

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[1] Paul DR, Newman S, "Polymer Blends," Academic Press, N.Y. (1978)

[2] Mark HF, Bikales NM, Overberger CG, Menges G, "Encyclopedia of Polymer Science and Engineering," John Wiley & Sons (1988)

[3] Domininghaus H, "Pastic for Engineer," Hanser Publisher (1992)

[4] Kim BS, Kim YS, Jang SH, Polym.(Korea), 19(6), 903 (1995)

[5] Nishi T, Kwei TK, Wang TT, J. Appl. Phys., 46, 4157 (1975)

[6] Hourston DJ, Hughes ID, Rubber Conf., 1, 13 (1977)

[7] Nishi T, Kwei TK, AAPG Bull., 20, 1331 (1976)

[8] Ito H, Wignall GD, Russell TP, Macromolecules, 20, 2213 (1987)

[9] Addonizio ML, Martuscelli E, Silvestre C, Polymer, 28, 183 (1987)

[10] Nishi T, Wang TT, Macromolecules, 8, 909 (1975)

[11] Aoki Y, Watanebe M, Polym. Eng. Sci., 32, 878 (1992)

[12] Hwang SH, Lee YC, Jung JC, Lee SW, Polym.(Korea), 21(2), 262 (1997)

[13] Fox TG, Bull. Am. Phys. Soc., 2, 123 (1956)

[14] Lee Y, Porter RS, Lin JS, Macromolecules, 22, 1756 (1989)

[15] Lee Y, Porter RS, Macromolecules, 20, 1336 (1987)

[16] Kerner EH, Proc. Phys. Sci., 69B, 808 (1956)

[17] Fujino K, Owaga I, Kawai H, J. Appl. Polym. Sci., 8, 2147 (1964)

[18] Chuang HK, Han CD, J. Appl. Polym. Sci., 30, 165 (1985)

[19] Kim WN, Denn MM, J. Rheol., 36, 1477 (1992)

[20] Oldroyd JG, Proc. R. Soc. London. Ser., A218, 122 (1953)

[21] Palierne JF, Rheol. Acta, 29, 204 (1990)