期刊
POLYMER TESTING
卷 85, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.polymertesting.2020.106439
关键词
Film blowing; Polyethylene; Crystallization; Structure-process-property relationship; Synchrotron radiation X-ray scattering
资金
- National Key R&D Program of China [2016YFB0302500]
- Fundamental Research Funds for the Central Universities [WK2310000079]
- National Natural Science Foundation of China [51703217, 51633009]
The copolymerization of ethylene and different alpha-olefins could result in polyethylene (PE) with different structural topologies, and lead to polyethylene products with different macroscopic performances. Herein, three different polyethylene samples, namely low-density polyethylene (l-PE), metallocene catalyzed ethylene-hexene copolymer (h-PE) and ethylene-octene copolymer (o-PE), were selected as representatives to construct the structure-process-property relationship during film blowing. The detailed crystal-based network evolution during film blowing was first characterized by in-situ synchrotron radiation X-ray scattering. The crystallization process of l-PE film is determined by the coupling effects of temperature and flow, while those of h-PE and o-PE films are dominated by the temperature. Furthermore, the hierarchical crystal structure from the molecular scale to micrometers of final films and segmental dynamics were systematically characterized by multiple ex-situ characterization techniques, i.e. Solid-State NMR, FTIR, SEM. l-PE film shows the crystalline morphology of the row-nucleated structure, whereas h-PE and o-PE show spherulite-like superstructure with better mechanical properties. The current study tentatively constructs the relation of primary chemical structure, microstructural evolution and macroscopic performances of different polyethylene copolymers during film blowing.
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