Advanced Characterization of Propylene-Based Copolymers and Olefin Block Copolymers |
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| Authors: | Colin Li Pi Shan Matt Miller Dean Lee Zhe Zhou |
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| Institution: | 1. The Dow Chemical Company, Dow Elastomers R&D, Freeport, TX 77541, USA;2. The Dow Chemical Company, Analytical Sciences R&D, Freeport, TX 77541, USA;3. The Dow Chemical Company, Analytical Sciences R&D, Midland, MI 48667, USA |
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| Abstract: | Summary: The newly developed interactive separation of polyolefins by high temperature liquid chromatography (HTLC) provides new information about the chemical composition distribution of polyolefin elastomers. The technique has the advantage of being quantitative in its separation, and has high resolution for the separation of polyolefins by their chemical composition without influence by cocrystallization. Chemical composition distributions can be determined for individual polymers and blends which contain the full range of comonomer typically present in polyethylene and poylypropylene homopolymers, semi-crystalline copolymers, and amorphous copolymers. HTLC analysis in combination with the other fractionation techniques, such as DSC, TREF, NMR, and xylene fractionation, can be used to estimate the amount of olefin block copolymer present in a block composite produced by chain shuttling catalysis. |
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| Keywords: | adsorption chromatography ATREF DSC high temperature liquid chromatography impact copolymer interaction chromatography NMR olefin block copolymer propylene-alpha olefin copolymer random copolymer TREF two dimensional liquid chromatography |
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