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Thermal Behavior and Physical Properties of Low Density Polyethylene/Metallocene Linear Low Density Polyethylene Blends  

Kim, Jang-Yup (Department of Chemical & Environmental Engineering, Soongsil University)
Hyun, Uk (Department of Chemical & Environmental Engineering, Soongsil University)
Lee, Dong-Ho (Department of Polymer Science, Kyungpook National University)
Noh, Seok-Kyun (School of Chemical Engineering & Technology, Yeoungnam University)
Lee, Sang-Won (Department of Chemical & Environmental Engineering, Soongsil University)
Huh, Wan-Soo (Department of Chemical & Environmental Engineering, Soongsil University)
Publication Information
Polymer(Korea) / v.27, no.5, 2003 , pp. 502-507 More about this Journal
Abstract
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 l-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;
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