Citation: Yan-hu Xue, Shu-qin Bo, Xiang-ling Ji. Comparison of Chain Structures between High-speed Extrusion Coating Polyethylene Resins by Preparative Temperature Rising Elution Fractionation and Cross-fractionation[J]. Chinese Journal of Polymer Science, ;2015, 33(11): 1586-1597. doi: 10.1007/s10118-015-1709-9 shu

Comparison of Chain Structures between High-speed Extrusion Coating Polyethylene Resins by Preparative Temperature Rising Elution Fractionation and Cross-fractionation

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State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China

Corresponding author: Xiang-ling Ji,
Received Date: 20 April 2015
Revised Date: 27 May 2015

Fund Project: 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).

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 ℃ and 50 ℃ fractions with lower molecular weights, and more fractions at 75 ℃ and 85 ℃ 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.
- Polyethylene,
- High-speed extrusion coating,
- Chain structure,
- TREF,
- Cross-fractionation
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沈阳化工大学材料科学与工程学院沈阳 110142