Studies on the intermolecular structural heterogeneity of a propylene‐ethylene random copolymer using preparative temperature rising elution fractionation
作者： Yonggang Liu , Shuqin Bo , Yejuan Zhu , Wenhe Zhang
DOI: 10.1002/APP.21761
关键词: Polymer chemistry 、 Copolymer 、 Differential scanning calorimetry 、 Comonomer 、 Polypropylene 、 Analytical chemistry 、 Tacticity 、 Gel permeation chromatography 、 Ethylene 、 Chemistry 、 Elution
摘要: The intermolecular structural heterogeneity of a propylene-ethylene random copolymer was studied by preparative temperature rising elution fractionation combined with GPC, 13C-NMR, differential scanning calorimetry, and wide-angle X-ray diffraction analysis the obtained fractions. isotacticity fractions increased increasing temperature, ethylene content decreased monotonously. Fitting comonomer triad sequences Bernoullian first-order Markovian statistical models indicated that lower isospecific active sites are more toward ethylene. isolated unit disrupted crystallizable isotactic sequence lowered crystallizability polypropylene chain. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 97: 232–239,
sci-hub.se 参考文章(13)
James C. Randall, Polymer Sequence Determination: Carbon-13 NMR Method ,(1977)
Junting Xu, Linxian Feng, Application of temperature rising elution fractionation in polyolefins European Polymer Journal. ,vol. 36, pp. 867- 878 ,(2000) , 10.1016/S0014-3057(99)00143-3
Y Feng, J.N Hay, The characterisation of random propylene–ethylene copolymer Polymer. ,vol. 39, pp. 6589- 6596 ,(1998) , 10.1016/S0032-3861(97)10171-9
J.B.P. Soares, A.E. Hamielec, Temperature rising elution fractionation of linear polyolefins Polymer. ,vol. 36, pp. 1639- 1654 ,(1995) , 10.1016/0032-3861(95)99010-R
G. Joseph Ray, Paul E. Johnson, Jack R. Knox, Carbon-13 Nuclear Magnetic Resonance Determination of Monomer Composition and Sequence Distribution in Ethylene-Propylene Copolymers Prepared with a Stereoregular Catalyst System Macromolecules. ,vol. 10, pp. 773- 778 ,(1977) , 10.1021/MA60058A010
Yonggang Liu, Shuqin Bo, Characterization of the Microstructure of Biaxially Oriented Polypropylene Using Preparative Temperature-Rising Elution Fractionation International Journal of Polymer Analysis and Characterization. ,vol. 8, pp. 225- 243 ,(2003) , 10.1080/10236660304880
L. Verdurmen-Noël, L. Baldo, S. Bremmers, SEC–FTIR characterization of semi-crystalline HDPE and PP Polymer. ,vol. 42, pp. 5523- 5529 ,(2001) , 10.1016/S0032-3861(00)00620-0
Masahiro Kakugo, Tatsuya Miyatake, Kooji Mizunuma, Yoshio Kawai, Characteristics of ethylene-propylene and propylene-1-butene copolymerization over TiCl3.cntdot.1/3AlCl3-Al(C2H5)2Cl Macromolecules. ,vol. 21, pp. 2309- 2313 ,(1988) , 10.1021/MA00186A002
C. Cozewith, Interpretation of carbon-13 NMR sequence distribution for ethylene-propylene copolymers made with heterogeneous catalysts Macromolecules. ,vol. 20, pp. 1237- 1244 ,(1987) , 10.1021/MA00172A013
A Faldi, J.B.P Soares, Characterization of the combined molecular weight and composition distribution of industrial ethylene/α-olefin copolymers Polymer. ,vol. 42, pp. 3057- 3066 ,(2001) , 10.1016/S0032-3861(00)00664-9