© Influence Of Branch Content, Comonomer Type, And Crosshead Speed On The Mechanical Properties Of Metallocene Linear Low-Density Polyethylenes Islam,

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© Influence Of Branch Content, Comonomer Type, And Crosshead Speed On The Mechanical Properties Of Metallocene Linear Low-Density Polyethylenes Islam, A; Hussein, IA JOHN WILEY SONS INC, JOURNAL OF APPLIED POLYMER SCIENCE; pp: ; Vol: 100 King Fahd University of Petroleum & Minerals Summary The effects of branch content (BC) and comonomer type on the mechanical properties of metallocene linear low-density polyethylene (m-LLDPEs) were studied by means of a stress-strain experiment at room temperature. A total of 16 samples with different BCs and comonomer types were used. In addition, the effect of crosshead speed on the mechanical properties of m-LLDPEs with different BCs was examined. The degree crystallinity (X-t) of these copolymers was determined by differential scanning calorimetry. In addition, Ziegler-Natta linear low-density polyethylenes (ZN- LLDPEs) were also studied for comparison purposes. The increase in BC of m- LLDPEs decreased X(t)and the modulus. However, the ZN-LLDPEs showed higher small-strain properties but lower ultimate properties than the m-LLDPEs with similar weight-average molecular weights and BCs. In comparison with low-BC resins, m- LLDPEs with high BCs exhibited a stronger strain hardening during the stress-strain experiments. Strain hardening was modeled by a modified Avrami equation, and the order of the mechanically induced crystal growth was in the range of 1-2, which suggested athermal nucleation. The crosshead speed was varied in the range mm/min. For low-BC m-LLDPEs, there existed a narrow crosshead speed window within which the maxima in modulus and ultimate properties were observed. The location of the maxima were independent of BC. The effect of the crosshead speed on Copyright: King Fahd University of Petroleum & Minerals;

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© SEHANOBISH K, 1994, J APPL POLYM SCI, V51, P887 SHAN CLP, 2002, POLYMER, V43, P767 SIMANKE AG, 1999, J APPL POLYM SCI, V74, P1144 SUMITA M, 1977, J POLYM SCI POL PHYS, V15, P837 TANEM BS, 2001, POLYMER, V42, P5389 TERMONIA Y, 1988, MACROMOLECULES, V21, P3485 TOBIN MC, 1974, J POLYM SCI PP, V12, P399 USAMI T, 1986, MACROMOLECULES, V19, P2722 VANDERWAL A, 1998, POLYMER, V39, P5477 WARD IM, 2000, INTRO MECH PROPERTIE, P237 WUNDERLICH B, 1976, MACROMOLECULAR PHYSI, V2, P147 WUNDERLICH B, 1997, THERMAL CHARACTERIZA, V1, P252 XU XR, 2000, J APPL POLYM SCI, V77, P1709 For pre-prints please write to: Copyright: King Fahd University of Petroleum & Minerals;