THE EFFECT OF CATALYST TYPES ON MICROSTRUCTURE OF ETHYLENE/1-HEXENE COPOLYMER BY THERMAL FRACTIONATION

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MORTAZAVI SEYED MOHAMMAD MAHDI

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Journal: Iranian Journal of Polymer Science and Technology Year:2016 | Volume:28 | Issue:5 Page(s): 385-394

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Title

THE EFFECT OF CATALYST TYPES ON MICROSTRUCTURE OF ETHYLENE/1-HEXENE COPOLYMER BY THERMAL FRACTIONATION

Author(s)

MORTAZAVI SEYED MOHAMMAD MAHDI | Issue Writer Certificate

Keywords

METALLOCENE CATALYSTQ1

ZIEGLER-NATTA CATALYSTQ1

PHILIPS CATALYSTQ1

THERMAL FRACTIONATIONQ1

MICROSTRUCTUREQ1

Abstract

Olefinic copolymers of ethylene/1-hexene were synthesized by three main types of supported catalysts, including Philips, Ziegler-Natta and METALLOCENE CATALYSTs, and the specific microstructural features delivered by each class of the catalysts were studied. The heterogeneity of comonomer distribution was studied by THERMAL FRACTIONATION using successive self-nucleation annealing (SSA) as a novel method. It was observed that the comonomer incorporation ability decreasedin the order of metallocene>Ziegler-Natta>Philips. The chemical composition distribution (CCD) of the produced copolymers was investigated by differential scanning calorimetry (DSC). Interestingly, we found that the copolymers produced by the directly supported METALLOCENE CATALYST displayed heterogeneous distributions of comonomer, similar to the products obtained by Ziegler–Nata and PHILIPS CATALYSTs. The lamellar thickness distributions of the copolymers were calculated by the DSC curvedeconvolution into a number of standard distribution functions. It has been shown thatthe type of supported catalyst does not affect the lamella thickness distribution to adiscernible extent. The range of lamellar thickness was about 2-29 Å for the polymersproduced using directly supported metallocene, Zigler-Natta and PHILIPS CATALYSTs, while the corresponding value for copolymers made by homogeneous metallocenecatalyst was in the range of 2-7 Å. It could be concluded that in-situ supporting of METALLOCENE CATALYST increased the comonomer incorporation in a more homogeneous fashion. In addition, comonomer units were distributed more homogeneously at higher1-hexene concentrations as could be realized from the approach of DSC index (DSCI) which showed that the DSC index moved towards unity at higher comonomer levels.

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APA: Copy

MORTAZAVI, SEYED MOHAMMAD MAHDI. (2016). THE EFFECT OF CATALYST TYPES ON MICROSTRUCTURE OF ETHYLENE/1-HEXENE COPOLYMER BY THERMAL FRACTIONATION. IRANIAN JOURNAL OF POLYMER SCIENCE AND TECHNOLOGY (PERSIAN), 28(5), 385-394. SID. https://sid.ir/paper/6726/en

Vancouver: Copy

MORTAZAVI SEYED MOHAMMAD MAHDI. THE EFFECT OF CATALYST TYPES ON MICROSTRUCTURE OF ETHYLENE/1-HEXENE COPOLYMER BY THERMAL FRACTIONATION. IRANIAN JOURNAL OF POLYMER SCIENCE AND TECHNOLOGY (PERSIAN)[Internet]. 2016;28(5):385-394. Available from: https://sid.ir/paper/6726/en

IEEE: Copy

SEYED MOHAMMAD MAHDI MORTAZAVI, “THE EFFECT OF CATALYST TYPES ON MICROSTRUCTURE OF ETHYLENE/1-HEXENE COPOLYMER BY THERMAL FRACTIONATION,” IRANIAN JOURNAL OF POLYMER SCIENCE AND TECHNOLOGY (PERSIAN), vol. 28, no. 5, pp. 385–394, 2016, [Online]. Available: https://sid.ir/paper/6726/en

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