首页 | 本学科首页   官方微博 | 高级检索  
     


Melting Point and Composition Distribution of Polyolefins by Fractionation
Authors:D. F. Slonaker  R. L. Combs  H. W. Coover JR.
Affiliation:RESEARCH LABORATORIES, TENNESSEE EASTMAN COMPANY , DIVISION OF EASTMAN KODAK COMPANY , KINGSPORT, TENNESSEE
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.
Keywords:Polyazomethine  Polyurethane  Poly(azomethine-urethane)
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号