Journal
Polymer Chemistry
Volume 6, Issue 17, Pages 3315-3323Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5py00205b
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Funding
- Shandong Province Natural Science Fund for Distinguished Young Scholars [JQ201213]
- National Nature Science Foundation of China [21174074]
- National Key Technology R&D Program of China [2011BAE26B05]
- Nature Science Foundation of Shandong Province [ZR2013BN004]
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In this paper, a crystalline/crystalline polyolefin alloy - isotactic polypropylene/isotactic polybutene-1 (iPP/iPB) in-reactor alloy with spherical particle morphology - were synthesized by sequential two-stage polymerization using a spherical MgCl2-supported Ziegler-Natta catalyst. The iPP/iPB alloys obtained were mainly composed of isotactic polybutene-1, isotactic polypropylene and polypropylene-block-poly (butene-1) block copolymers, which occupied more than 95 wt% of the total alloy. A possible polymerization mechanism was proposed to explain the block copolymer formation. The morphologies of original alloy particles and n-heptane-extracted alloy particles were characterized by SEM and a particle growth model of iPP/iPB alloy was proposed to illustrate the sequential two-stage polymerization mechanism and active-species distribution during this process.
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