1. 1. 2. 3. 4. 5. 6. © Effect Of Short Chain Branching Of LDPE On Its Miscibility With Linear HDPE Hameed, T; Hussein, IA WILEY-V C H VERLAG GMBH, MACROMOLECULAR MATERIALS AND ENGINEERING; pp: 198-203; Vol: 289 King Fahd University of Petroleum & Minerals http://www.kfupm.edu.sa Summary The influences of short chain branching (SBC) on the melt miscibility of low-density polyethylene (LDPE) with linear high-density polyethylene (HDPE) were investigated by rheological methods. Two LDPE resins with different branch contents were blended with the same linear HDPE. Dynamic and steady shear measurements were carried out using a Rheometrics ARES rheometer at 190degreesC. The rheology of the low-SCB LDPE (9 CH3/1 000 C) blends with HDPE can be predicted by the linear additivity rule. Hence, blends wee suggested to be completely miscible at all compositions. However, blends of the high branch content LDPE (SCB = 19 CH3/1 000 C) were completely immiscible. Also, the different viscous and elastic properties of all the immiscible blends were much higher than the corresponding values for the more viscous and elastic blend component. The ratio of interfacial tension to droplet radius was estimated from Scholz et al. model as approximate to1 500 N. m(-2). The level of SCB in LDPE was found to have a strong influence on its miscibility with linear HDPE. References: AGAMALIAN M, 1999, MACROMOLECULES, V32, P3093 ALAMO RG, 1994, MACROMOLECULES, V27, P2864 BARHAM PJ, 1988, J MATER SCI LETT, V7, P1271 BRAHIMI B, 1991, J RHEOL, V35, P1069 CHAUNG CI, 1984, J APPL POLYM SCI, V29, P2205 CHO K, 1989, POLYM ENG SCI, V29, P1969 Copyright: King Fahd University of Petroleum & Minerals; http://www.kfupm.edu.sa

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