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Comparison of chain structures between high-speed extrusion coating polyethylene resins by preparative temperature rising elution fractionation and cross-fractionation

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Abstract

Two polyethylene (PE) resins (samples A and B) are synthesized as high-speed extrusion coatings with similar minimum coating thickness and neck-in performance but different maximum coating speeds. Both samples are separated into seven fractions using preparative temperature rising elution fractionation. The microstructures of the original samples and their fractions are studied by high-temperature gel permeation chromatography, Fourier transform infrared spectroscopy, 13C nuclear magnetic resonance spectroscopy, differential scanning calorimetry, and successive self-nucleation/annealing thermal fractionation. Compared with sample B, sample A has a broader MWD, more LCB contents, and less SCB contents. Moreover, sample A contains slightly more 30 °C and 50 °C fractions with lower molecular weights, and more fractions at 75 °C and 85 °C with higher molecular weight. The chain structure and its distribution in the two PE resins are studied in detail, and the relationship between the chain structure and resin properties is also discussed.

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Correspondence to Xiang-ling Ji  (姬相玲).

Additional information

This work was financially supported by the National Basic Research Program of China (No. 2005CB623806) and the National Natural Science Foundation of China (Nos. 20734006 and 50921062).

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Xue, Yh., Bo, Sq. & Ji, Xl. Comparison of chain structures between high-speed extrusion coating polyethylene resins by preparative temperature rising elution fractionation and cross-fractionation. Chin J Polym Sci 33, 1586–1597 (2015). https://doi.org/10.1007/s10118-015-1709-9

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  • DOI: https://doi.org/10.1007/s10118-015-1709-9

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