Miscibility and Properties of cis-Polybutadiene/Ethyl-Branched Polyethylene Blends(II)

Ur Ryong Cho

Korea Polymer Journal, Vol.8, No.2, 66-72, April, 2000

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Miscibility and Properties of cis-Polybutadiene/Ethyl-Branched Polyethylene Blends(II)

Ur Ryong Cho^†

Department of Applied Chemical Eng., Korea Univ. of Technology and Education, Chonan 330-860, Korea

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Cis-Polybutadiene(cis-PBD) and the three polyethylenes(PE''s) having different branch content were mixed to investigate crystallinity, thermodynamic interaction parameter(c), and diluents effect. Crystallinty of PE''s decreased with increasing content of amorphous cis-PBD because of a decrease in both the degree of annealing and kinetics of diffusion of the crystallizable polymer content. The thermodynamic interaction parameter(c) for the three blend systems approximately equals to zero near the melting point. These systems were determined to be miscible on a molecular scale near or above the crystalline melting point of the crystalline PE''s. From the measurement of T_m vs. T_c behavior, all the three blends showed a straight line for a plot of T_m vs. T_c. This result means that the melting behavior of PE is mainly due to a diluent effect of cis-PBD component.

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[1] Cho UR, Korea Polym. J., 7(3), 196 (1999)

[2] Cho UR, Polym.(Korea), 19(5), 535 (1995)

[3] Kwei T, Frisch H, Macromolecules, 11, 1267 (1978)

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

[5] Schultz J, "Polymer Materials Science," Pretence-Hall, Inc., New Jersey, 1974 (1974)

[6] Natta G, Corradini P, Sianesi D, Morero D, J. Polym. Sci., 51, 527 (1961)

[7] Hoffman JD, Soc. Plast. Eng. Trans., 4, 315 (1964)

[8] Lin WY, Ph.D. Dissertation, Univ. of Akron, 1983 (1983)

[9] Allegra G, Bassi I, Adv. Polym. Sci., 6, 549 (1969)

[10] Kwei T, Patterson G, Wang T, Macromolecules, 9, 780 (1976)

[11] Martuscelli E, Silibestre C, Abate G, Polymer, 23, 229 (1982)

[12] Paul D, Altaminano J, Am. Chem. Soc. Adv. Chem. Ser., 142, 371 (1975)

[13] Natov M, Peeva L, Djagarova E, J. Polym. Sci. C-Polym. Lett., 16, 4197 (1973)

[14] Martuscelli E, Demma G, "Polymeric Blends: Proceessing-Morpology and Properties," ed., E. Martuscelli, R. Palumbo and M. Kryszewski, Pleum Press, N.Y., 1990 (1990)

[15] Schroeder JR, Ph.D. Dissertation, Univ. of Akron, 1990 (1990)