Crystalline and viscoelastic properties of branched polyethylenes synthesized using bidentate nickel (II) catalyst
作者： Deuk-Kil Park , Il Kim , Chang-Sik Ha
DOI: 10.1016/J.POLYMER.2003.10.021
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摘要: In this work, five branched polyethylenes with different branching units were synthesized using bidentate nickel (II) catalyst containing α-diimine ligands. For comparison, one linear polyethylene was also prepared tridentate iron ligand. The crystalline structure of the investigated X-ray diffraction (XRD) and polarized optical microscope. properties measured by differential scanning calorimeter (DSC). Viscoelastic rheometric dynamic analyzer. DSC XRD results showed that highly exhibit no melting points predominating forms, while exhibits clear orthorhombic (110) (200) reflections on pattern a point at 118 °C. viscoelastic very complicated due to combined effect molecular weight difference degree chain as well structure.
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sci-hub.se 参考文章(25)
M. Glotin, L. Mandelkern, Crystalline morphology of isothermally crystallized branched polyethylene Macromolecules. ,vol. 14, pp. 1394- 1404 ,(1981) , 10.1021/MA50006A049
Werner Röll, Hans-Herbert Brintzinger, Bernhard Rieger, Ralf Zolk, Stereo‐ and Regioselectivity of Chiral, Alkyl‐substituted ansa‐Zirconocene Catalysts in Methylalumoxane‐activated Propene Polymerization Angewandte Chemie. ,vol. 29, pp. 279- 280 ,(1990) , 10.1002/ANIE.199002791
N.W.J. Brooks, R.A. Duckett, I.M. Ward, Effects of crystallinity and stress state on the yield strain of polyethylene Polymer. ,vol. 40, pp. 7367- 7372 ,(1999) , 10.1016/S0032-3861(99)00054-3
V. R. Raju, G. G. Smith, G. Marin, J. R. Knox, W. W. Graessley, Properties of amorphous and crystallizable hydrocarbon polymers. I. Melt rheology of fractions of linear polyethylene Journal of Polymer Science: Polymer Physics Edition. ,vol. 17, pp. 1183- 1195 ,(1979) , 10.1002/POL.1979.180170704
Dipak Rana, Kyucheol Cho, Taewoo Woo, Byung H. Lee, Soonja Choe, Blends of ethylene 1‐octene copolymer synthesized by Ziegler–Natta and metallocene catalysts. I. Thermal and mechanical properties Journal of Applied Polymer Science. ,vol. 74, pp. 1169- 1177 ,(1999) , 10.1002/(SICI)1097-4628(19991031)74:5<1169::AID-APP13>3.0.CO;2-W
Lynda K. Johnson, Christopher M. Killian, Maurice Brookhart, New Pd(II)- and Ni(II)-Based Catalysts for Polymerization of Ethylene and .alpha.-Olefins Journal of the American Chemical Society. ,vol. 117, pp. 6414- 6415 ,(1995) , 10.1021/JA00128A054
Brooke L. Small, Maurice Brookhart, Iron-Based Catalysts with Exceptionally High Activities and Selectivities for Oligomerization of Ethylene to Linear α-Olefins Journal of the American Chemical Society. ,vol. 120, pp. 7143- 7144 ,(1998) , 10.1021/JA981317Q
Roberto F. De Souza, Leonardo C. Simon, Raquel S. Mauler, Effect of the alkylaluminum cocatalyst on ethylene polymerization by a nickel-diimine complex Journal of Polymer Science Part A. ,vol. 37, pp. 4656- 4663 ,(1999) , 10.1002/(SICI)1099-0518(19991215)37:24<4656::AID-POLA24>3.0.CO;2-G
L. Mandelkern, Thermodynamic and morphological properties of crystalline polymers The Journal of Physical Chemistry. ,vol. 75, pp. 3909- 3920 ,(1971) , 10.1021/J100695A001
Adriane G Simanke, Griselda B Galland, Liane Freitas, João Alziro H da Jornada, Raul Quijada, Raquel S Mauler, Influence of the comonomer content on the thermal and dynamic mechanical properties of metallocene ethylene/1-octene copolymers Polymer. ,vol. 40, pp. 5489- 5495 ,(1999) , 10.1016/S0032-3861(98)00771-X