Melting Point and Composition Distribution of Polyolefins by Fractionation |
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Authors: | D. F. Slonaker R. L. Combs H. W. Coover JR. |
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Affiliation: | RESEARCH LABORATORIES, TENNESSEE EASTMAN COMPANY , DIVISION OF EASTMAN KODAK COMPANY , KINGSPORT, TENNESSEE |
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Abstract: | The fractionation technique described in this paper was used to characterize the melting-point, monomer, and blocking distributions for polymers and copolymers. It is different from the molecular-weight fractionation technique in that the fractions are obtained by using a single solvent to extract the solid polymer below its melting point at stepwise-increasing temperatures. The reproducibility of this technique is excellent, and the technique is sufficient to distinguish pellet-to-pellet variation in a commercially available polypropylene. It was used to show the influence of preparation variables on the melting-point distributions of polyethylene and polypropylene and on the monomer and blocking distribution of copolymers, and to distinguish copolymers from blends. |
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Keywords: | Polyazomethine Polyurethane Poly(azomethine-urethane) |
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