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On the intermolecular and intramolecular branching distribution. in ethylene/α-olefin copolymers

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Summary

For the complex phenomena of comonomer distribution in ethylene/α-olefin copolymers prepared on heterogeneous Ziegler-Natta catalysts, a branch distribution function P(b) was proposed to quantify the intermolecular branch distribution (InterBD). P(b) values calculated from solvents extraction fractions were found to correspond to the alleged sequence length distribution represented by r1·r2 as determined from13C NMR data. The InterBD is attributed to thermodynamically-controlled polymerization processes due to the presence of multiple active centers. Literature data also showed a decrease in reactivity parameter r1·r2 with increasing comonomer ratio. A diffusion-controlled model is suggested for the intramolecular branch distribution (IntraBD).

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Authors and Affiliations

  1. Changchun Institute of Applied Chemistry, Academia Sinica, 130022, Changchun, Jilin, People's Republic of China

    Jianguo Wang, Deren Pang & Baotong Huang

Authors
  1. Jianguo Wang
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  2. Deren Pang
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  3. Baotong Huang
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Supported by the Chinese Petrochemical Corporation (SINOPEC)

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Wang, J., Pang, D. & Huang, B. On the intermolecular and intramolecular branching distribution. in ethylene/α-olefin copolymers. Polymer Bulletin 23, 127–131 (1990). https://doi.org/10.1007/BF00983974

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  • DOI: https://doi.org/10.1007/BF00983974

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