저밀도 폴리에틸렌/메탈로센 선형 저밀도 폴리에틸렌 블렌드의 열적 거동 및 물성

김장엽; 현욱; 이동호; 노석균; 이상원; 허완수; Jang Yup Kim; Uk Hyun; Dong Ho Lee; Seok Kyun Noh; Sang Won Lee; Wansoo Huh

Polymer(Korea), Vol.27, No.5, 502-507, September, 2003

Export Citation

저밀도 폴리에틸렌/메탈로센 선형 저밀도 폴리에틸렌 블렌드의 열적 거동 및 물성

Thermal Behavior and Physical Properties of Low Density Polyethylene Blends

김장엽 , 현욱, 이동호 ¹, 노석균 ², 이상원 , 허완수 ^†

숭실대학교 환경화학공학과, 서울 156-743
¹경북대학교 고분자공학과, 대구 702-701
²영남대학교 응용화학공학부, 경산 712-749

Jang Yup Kim , Uk Hyun, Dong Ho Lee¹, Seok Kyun Noh², Sang Won Lee , and Wansoo Huh^†

Department of Chemical & Environmental Engineering, Soogsil university, 1-1, Sangdo-dong, Dongjak-gu, Seoul 156-743, Korea
¹Deparment of Polymer Science, Kyungpook National University, 1370, Sangyeok-dong, Buk-gu, Daegu 702-701, Korea
²School of Chemical Engineering & Technology, Yeoungnam University, 214-1 Dae-dong kyongsan 712-749g, Korea

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초록

메탈로센 선형 저밀도 폴리에틸렌 (m-LLDPE)과 저밀도 폴리에틸렌 (LDPE)을 용융 블렌딩 방법으로 블렌드를 제조하여 열적 거동 및 물성을 관찰하였다. LDPE/m-LLDPE1 블렌드는 LDPE 조성이 50% 이상이면 두 개의 용융 피크가 관찰된 반면 다른 블렌드들은 단일한 용융 피크를 나타내었다. m-LLDPE에서 공단량체 함량이 감소할수록 용융 온도와 상대 결정화도가 증가하였다. 공단량체 함량이 2 wt% m-LLDPE1이 초기 탄성률이 가장 높게 관찰되었고, 공단량체 함량이 증가함에 따라 감소하였다. 블렌드에서 조성에 따른 초기 탄성률의 변화는 상대 결정화도의 거동과 유사하게 나타났다. 블렌드의 파괴 신율은 LDPE/m-LLDPE1과 LDPE/m-LLDPE2 블렌드에서 평균값보다 낮은 파괴 신율을 나타내었었다. m-LLDPE2의 용융 지수가 가장 높게 관찰되었고 공단량체 함량이 증가함에 따라 감소하는 경향을 나타내었다.

The thermal and physical properties of low density polyethylene melt-blended with Metallocene linear low density polyethylenes were investigated. Since the Metallocene polyethylenes have similar MW and MWD except m-LLDPE4, it can be said that the thermal behavior and mechanical properties of the blends depend upon the 1-octene comonomer content. The melting behavior of LDPE/m-LLDPE1 blends shows two melting peaks with LDPE contents higher than 50%, while the other blends show only one melting peak. It was observed that the blends show higher crystallization temperature and higher crystallinity with lower comonomer content. Initial modulus of a blend exhibited the behavior proportional to the crystallinity and the elongation at break of the blends was increased with increasing the m-LLDPE composition. Melt indices of the blends decreased with increasing the comonomer content of Metallocene LLDPE. Melt Index values of the blends show negative deviation.

Keywords:blend;metallocene LLDPE;LDPE;physical properties;thermal properties

[References]

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Utracki LA, Polymer Alloys and Blends, Hanser, Munich (1989)
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Olabis O, Robeson LM, Show MT, Polymer-Polymer Miscibility, Academic Press, New York (1979)
Sperling LH, Manson JA, Polymer Blends and Composites, Plenum Press, New York (1976)
Speed CS, Plast. Eng., July, 39 (1982)
Haghighat S, Bireley AW, Plast. Rub. Proc. Appl., 13, 197 (1990)
Babel AK, Campbell GA, TAPPI J., 78, 199 (1995)
Wong ACY, Plast. Rub. Comp. Proc. Appl., 20, 159 (1993)
McNally GM, Bermingham C, Murphy WR, Chem. Eng. Res. Des., 71, 223 (1993)
Furuyama A, Abana Y, Ushida Y, Masuda T, Nakajima A, Pure Appl. Chem., 57, 824 (1985)
Bubeck RA, Baker HM, Polymer, 23, 1680 (1982)
Leaversuch RD, Mod Plast. Int., 70, 18 (1995)
Schut JH, Plast. World, 53, 12 (1995)
DeGaravilla JR, TAPPI J., 78, 191 (1995)
Montagna AA, Floyd JC, Hydrocarb. Process., 73(3), 57 (1994)
Woo L, Ling MTK, Westphal SP, Thermochim. Acta, 272, 171 (1996)
Vasale, Handbook of Polyolefins, Marcel Dekker, New York (1993)
Shao Y, Liu S, Yang D, Macromol. Chem. Phys., 198, 1427 (1997)
Nishi T, Wang TT, Macromolecules, 8, 909 (1975)
Lee SY, Doctor Thesis, Seoul National University, 110 (1999)
Popli R,, J. Polym. Sci. B: Polym. Phys., 25, 441 (1987)
Rudin A, Macromol. Chem., 19, 267 (1980)
Cella RJ, Runt JP, Coleman MM, Polymer, 24, 37 (1983)
Shishesaz MR, Donatelli AA, Polym. Eng. Sci., 21, 869 (1981)

[Related Articles]

[1] Cho SM, Lee Y, Hwang SH, Lee SW, Kim SK, J. Korean Ind. Eng. Chem., 7(3), 504 (1996)

[2] Utracki LA, Polymer Alloys and Blends, Hanser, Munich (1989)

[3] Yeo JK, Sperling LH, Thomas DA, Polymer, 24, 307 (1983)

[4] Lipatov YS, Shilov VV, Gomza YP, Kovernik GP, Grigoreva OP, Sergeyeva LM, Makromol. Chem., 185, 347 (1984)

[5] Olabisi OS, Shaw MT, Robeson LM, Polymer-Polymer Miscibility, Academic Press, New York (1979)

[6] Solc K, Polymer Compatibility and Incompatibility, MMI Press, New York (1982)

[7] Olabis O, Robeson LM, Show MT, Polymer-Polymer Miscibility, Academic Press, New York (1979)

[8] Sperling LH, Manson JA, Polymer Blends and Composites, Plenum Press, New York (1976)

[9] Speed CS, Plast. Eng., July, 39 (1982)

[10] Haghighat S, Bireley AW, Plast. Rub. Proc. Appl., 13, 197 (1990)

[11] Babel AK, Campbell GA, TAPPI J., 78, 199 (1995)

[12] Wong ACY, Plast. Rub. Comp. Proc. Appl., 20, 159 (1993)

[13] McNally GM, Bermingham C, Murphy WR, Chem. Eng. Res. Des., 71, 223 (1993)

[14] Furuyama A, Abana Y, Ushida Y, Masuda T, Nakajima A, Pure Appl. Chem., 57, 824 (1985)

[15] Bubeck RA, Baker HM, Polymer, 23, 1680 (1982)

[16] Leaversuch RD, Mod Plast. Int., 70, 18 (1995)

[17] Schut JH, Plast. World, 53, 12 (1995)

[18] DeGaravilla JR, TAPPI J., 78, 191 (1995)

[19] Montagna AA, Floyd JC, Hydrocarb. Process., 73(3), 57 (1994)

[20] Woo L, Ling MTK, Westphal SP, Thermochim. Acta, 272, 171 (1996)

[21] Vasale, Handbook of Polyolefins, Marcel Dekker, New York (1993)

[22] Shao Y, Liu S, Yang D, Macromol. Chem. Phys., 198, 1427 (1997)

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

[24] Lee SY, Doctor Thesis, Seoul National University, 110 (1999)

[25] Popli R,, J. Polym. Sci. B: Polym. Phys., 25, 441 (1987)

[26] Rudin A, Macromol. Chem., 19, 267 (1980)

[27] Cella RJ, Runt JP, Coleman MM, Polymer, 24, 37 (1983)

[28] Shishesaz MR, Donatelli AA, Polym. Eng. Sci., 21, 869 (1981)