Effect of Comonomer Distribution of LLDPE on Crystallization and Morphology of HDPE/LLDPE Blends

Soo Yeol Lee; Jae Young Jho; Wansoo Huh; Wansoo Huh

Journal of Industrial and Engineering Chemistry, Vol.4, No.3, 258-262, September, 1998

Soo Yeol Lee, Jae Young Jho^†, Wansoo Huh , and Wansoo Huh

E-mail:

Linear low density polyethylenes (LLDPE) prepared by Ziegler-Natta catalyst (ZNLLD) and LLDPE by metallocene catalyst (MLLD) were respectively blended with high density polyethylene (HDPE), and the effect of the comonomer distribution on the crystallization behavior and morphology was studied. ZNLLD cocrystallized with HDPE in a wider range of blend compositions and with a smaller amount of separate-crystallized LLDPE than MLLD did. The result was considered to be due to the fact that MLLD had more even comonomer distribution than ZNLLD had. The etched-surface morphology exhibited that banded spherulites were more uniformly formed when cocrystallization only occurred. The non-uniform morphology appeared to be due to the mixed stacking of cocrystals and separate-crystals.

Keywords:polyethylene;blend;crystallization;HDPE;LLDPE

[References]

Tashiro K, Stein RS, Hsu SL, Macromolecules, 25, 1801 (1992)
Tashiro K, Izuchi M, Kobayashi M, Stein RS, Macromolecules, 27(5), 1234 (1994)
Lee SY, Jho JY, J. Ind. Eng. Chem., 4(2), 170 (1998)
Kimura K, Shigemura T, Yuasa S, J. Appl. Polym. Sci., 29, 3161 (1984)
Defoor F, Groeninckx G, Schouterden P, Heijden BV, Polymer, 33, 3878 (1992)
Takaoka T, Ikai S, Tamura M, Yano T, J. Macromol. Sci.-Pure Appl. Chem., A32(1), 83 (1995)
Lee DH, Jho JY, Polym. Bull., 38(6), 665 (1997)
Parker JA, Bassett DC, Olley RH, Jaaskelainen P, Polymer, 35(19), 4140 (1994)
Hsieh ET, Randall JC, Macromolecules, 15, 353 (1982)
Hsieh ET, Randall JC, Macromolecules, 15, 1402 (1982)
Olley RH, Bassett DC, Polymer, 23, 1707 (1982)
Metha A, Wunderlich B, Colloid Polym. Sci., 253, 193 (1975)
Gallagher KP, Zhang X, Runt JP, Huynhba G, Lin JS, Macromolecules, 26, 588 (1993)
Yeh JT, Runt J, J. Polym. Sci. B: Polym. Phys., 27, 1543 (1989)
Rim PB, Runt JP, Macromolecules, 17, 1520 (1984)
Tashiro K, Imanishi K, Izuchi M, Kobayashi M, Itoh Y, Imai M, Yamaguchi Y, Ohashi M, Stein RS, Macromolecules, 28(25), 8484 (1995)

[Referenced By]

[Related Articles]

[1] Tashiro K, Stein RS, Hsu SL, Macromolecules, 25, 1801 (1992)

[2] Tashiro K, Izuchi M, Kobayashi M, Stein RS, Macromolecules, 27(5), 1234 (1994)

[3] Lee SY, Jho JY, J. Ind. Eng. Chem., 4(2), 170 (1998)

[4] Kimura K, Shigemura T, Yuasa S, J. Appl. Polym. Sci., 29, 3161 (1984)

[5] Defoor F, Groeninckx G, Schouterden P, Heijden BV, Polymer, 33, 3878 (1992)

[6] Takaoka T, Ikai S, Tamura M, Yano T, J. Macromol. Sci.-Pure Appl. Chem., A32(1), 83 (1995)

[7] Lee DH, Jho JY, Polym. Bull., 38(6), 665 (1997)

[8] Parker JA, Bassett DC, Olley RH, Jaaskelainen P, Polymer, 35(19), 4140 (1994)

[9] Hsieh ET, Randall JC, Macromolecules, 15, 353 (1982)

[10] Hsieh ET, Randall JC, Macromolecules, 15, 1402 (1982)

[11] Olley RH, Bassett DC, Polymer, 23, 1707 (1982)

[12] Metha A, Wunderlich B, Colloid Polym. Sci., 253, 193 (1975)

[13] Gallagher KP, Zhang X, Runt JP, Huynhba G, Lin JS, Macromolecules, 26, 588 (1993)

[14] Yeh JT, Runt J, J. Polym. Sci. B: Polym. Phys., 27, 1543 (1989)

[15] Rim PB, Runt JP, Macromolecules, 17, 1520 (1984)

[16] Tashiro K, Imanishi K, Izuchi M, Kobayashi M, Itoh Y, Imai M, Yamaguchi Y, Ohashi M, Stein RS, Macromolecules, 28(25), 8484 (1995)