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Comparative Study of Zeolite-Filled LLDPE and HDPE Composite Films
Biswas, Jagannath,Kim, Hyun,Shim, Sang Eun,Kim, Geon Joong,Lee, Dai Soo,Choe, Soonja 한국공업화학회 2004 Journal of Industrial and Engineering Chemistry Vol.10 No.4
A comparative study of zeolite-filled LLDPE and HDPE composite films has been performed in terms of the filler dispersion, morphology, and the mechanical, Theological, and impact properties. The SEM morphology showed a good dispersion and adhesion of the filled zeolite in the LLDPE and HDPE systems. The HDPE/zeolite composite presents the higher draw ratio and aspect ratio, and has a larger number and bigger area of air holes than appear in the LLDPE system, which shows the most effective composition for diaper applications with a 40 wt% zeolite loading at a 300% draw ratio. The tensile and yield stress increased with the zeolite content in the LLDPE system, but the inverse behavior was observed in the HDPE system. The Young's Modulus gradually increased, whereas the elongation at break was constant up to a certain draw ratio, but decreased at high contents of zeolite in both the LLDPE and HDPE systems. The impact properties of the LLDPE composite improved at up to 40% zeolite content, but they decreased in the HDPE system, implying a weak interfacial interaction in the HDPE system. Morphological observations strongly support the differences in the mechanical properties between the LLDPE and HDPE systems. Based on various properties, zeolites can be good candidates for fillers in each LLDPE and HDPE system for particular purposes.
Jagannath, Jagannath Biswas,Kim, Hyun,Yim, Chai-Suk,Cho, Jungh-Wan,Kim, Geon-Joong,Choe, Soon-Ja,Lee, Dai-Soo The Polymer Society of Korea 2004 Macromolecular Research Vol.12 No.5
We have studied the effects that inorganic zeolite powder have on structurally different copolymer [poly(propylene-co-ethylene)] and terpolymer [poly(propylene-co-ethylene-co-l-butene)] systems and the possibility of preparing suitable porous composite films. The impact strength and yield stress of the composites did not improve upon any further loading of zeolite, but the modulus increased gradually with respect to the filler loading. The experimental modulus of each of the two systems was compared with theoretical models. We performed a morphological study of the filler mixing efficiency and image analysis. The number-, weight-, and z-average air hole diameters were compared with respect to the draw ratio as well as the zeolite loading. The experimental results suggest that these two matrices can provide a new choice for preparing future multiphase polymeric porous films by stretching them unidirectionally. In particular, we suggest that a 40 wt% zeolite loading at a draw ratio of 4 is useful for porous film applications.