LLDPE와 ter-PP의 블렌드; Ⅱ. 유변특성과 기계적 물성

조규철; 박인하; 최순자

Polymer(Korea), Vol.19, No.5, 625-632, September, 1995

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LLDPE와 ter-PP의 블렌드; Ⅱ. 유변특성과 기계적 물성

LLDPE and ter-PP Polymer BlendsⅡ. Rheological and Mechanieal Properties

조규철, 박인하, 최순자

초록

LLDPE(ethylene-octene-1 copolymer)에 순수 폴리플로필렌 고분자의 투명성, 내충격성 및 열봉합성 등을 개선한 상업용 ter-PP (ethylene-propylene-butene-1 terpolymer)를 함량별로 압출 블렌딩하여 이들의 유변학적, 기계적 물성에 관한 연구를 RMS, 모세관 레오미터, UTM 등을 이용하여 수행하였다. 유변학적 분석 결과 소량의 ter-PP가 함유된 블렌드는 용융점도의 감소, 전단응력과 최종하중의 저하를 초래하여 가공성 향상을 가져올 수 있는 가능성을 보였으며 압출부하가 현저하게 감소되었다. 기계적물성의 경우 블렌드 함량에 따라 (i) LLDPE가 많은 부분, (ⅱ) LLDPE/ter-PP의 비가 비숫한 부분, (iii) ter-PP가 많은 부분으로 그 영역을 3개로 구분할 수 있었다. (i)과 (ⅲ)영역에서는 파단점 인장강도와 신장률이 약간 떨어지는 반면, (ⅱ)영역에서는 이들 물성이 급격히 저하하는 비상용성 블렌드의 특성을 나타내었다. 그러나, 항복점에서의 인장강도와 굴곡강도는 ter-PP 함량에 따라 비례적으로 향상되어, LLDPE/ter-PP 블렌드에서 20%의 ter-PP가 함유된 블렌드는 가공성, 기계적 물성 및 가격저하 면에서 상호 보완하는 장점이 있는 블렌드 조성비로 사용될 가능성이 있다

Rhoelogical and mechanical properties of commercial LLDPE (ethylene-octene-1 copolymer ) and ter-PP (ethylene-propylene-butene-1 terpolymer) blend system which was mixed in a twin screw extruder were investigated by RMS, capillary rheometer and UTM. The result of melt rheological properties showed that an incorperation of ter-PP in the blends induced a reduction in melt viscosity, shear stress and final load, thereby the processability could be improved by an addition of ter-PP. The load of extrusion decreased with the addition of ter-PP. Tensile and flexural behaviors may be divided into three regions depending on the blend compositions : (i) LLDPE rich phase, (ii) the intermediate and (ⅲ) ter- PP rich phase. In the regions of ( i ) and ( iii ), there are some possibilities of synergistic effect on the blend despite the slightly weakened technical properties with favorable processibility. In region (ii), the ultimate tensile strength and elongation at break were dramatically dropped, indicating an immiscible characteristics. Among the LLDPE/ter-PP blends, 80/20 ratio has a merit to be used with an advantage in mechanical properties, processibility, and production cost.

[References]

Cho K, Choe S, Polym.(Korea), 19(5), 615 (1995)
Dumoulin MM, Farha C, Utraki LA, Polym. Eng. Sci., 24, 1319 (1984)
Zeichner GR, Patel PD, Proceeding of 2nd World Congress of Chem. Eng. 6, 333, Montreal, Canada (1981)
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Muller AJ, Balsamo V, Dasilva F, Rosales CM, Saez AE, Polym. Eng. Sci., 34(19), 1455 (1994)
Lee JO, Kim BK, Ha CS, Song HW, Lee JK, Cho WJ, Polym.(Korea), 18(1), 68 (1994)
Ness JN, Liang JZ, J. Appl. Polym. Sci., 48, 557 (1993)
Letton A, Tuminello WH, SPE ANTEC, 997 (1987)
Choudhary V, Varma HS, Varma IK, Polymer, 32, 2534 (1991)
Choudhary V, Varma HS, Varma IK, Polymer, 32, 2541 (1991)
Dumoulin MM, Utracki LA, Carreau PJ, 36th Canadian Chem. Eng. Conference, Sarnia, Ontario, Canada, Oct. (1986)
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Gupta AK, Rana SK, Deopura BL, J. Appl. Polym. Sci., 49, 477 (1993)
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[Referenced By]

[1] Cho K, Choe S, Polym.(Korea), 19(5), 615 (1995)

[2] Dumoulin MM, Farha C, Utraki LA, Polym. Eng. Sci., 24, 1319 (1984)

[3] Zeichner GR, Patel PD, Proceeding of 2nd World Congress of Chem. Eng. 6, 333, Montreal, Canada (1981)

[4] Zeichner GR, Macosko CW, "SPE ANTEC, San Francisco, U.S.A. May, 79 (1982)

[5] Tuminello WH, SPE ANTEC, 990 (1987)

[6] Wu S, Polym. Mater. Sci., 50, 43 (1984)

[7] Muller AJ, Balsamo V, Dasilva F, Rosales CM, Saez AE, Polym. Eng. Sci., 34(19), 1455 (1994)

[8] Lee JO, Kim BK, Ha CS, Song HW, Lee JK, Cho WJ, Polym.(Korea), 18(1), 68 (1994)

[9] Ness JN, Liang JZ, J. Appl. Polym. Sci., 48, 557 (1993)

[10] Letton A, Tuminello WH, SPE ANTEC, 997 (1987)

[11] Choudhary V, Varma HS, Varma IK, Polymer, 32, 2534 (1991)

[12] Choudhary V, Varma HS, Varma IK, Polymer, 32, 2541 (1991)

[13] Dumoulin MM, Utracki LA, Carreau PJ, 36th Canadian Chem. Eng. Conference, Sarnia, Ontario, Canada, Oct. (1986)

[14] Gupta AK, Rana SK, Deopura BL, J. Appl. Polym. Sci., 44, 719 (1992)

[15] Gupta AK, Rana SK, Deopura BL, J. Appl. Polym. Sci., 49, 477 (1993)

[16] Bartlett DW, Barlow JW, Paul DR, J. Appl. Polym. Sci., 27, 2351 (1982)

[17] Teh JW, Blom HP, Rudin A, Polymer, 35(8), 1680 (1994)

[18] Utracki LA, Am. Chem. Soc. Symp. Ser., 395, 1 (1989)

[19] Aklonis JJ, MacKnight WJ, "Introduction to Polymer Viscoleasticity," 2nd Ed., p. 204, Wiley (1982)

[20] Rhee J, Ph.D. Thesis, Northwestern Univ., Illinois, U.S.A. (1992)

[21] Flaris V, Stachurski ZH, J. Appl. Polym. Sci., 45, 1789 (1992)

[22] Paul B, Trans. Metallurg. Soc. AIME, 218, 36 (1960)