期刊
MACROMOLECULAR THEORY AND SIMULATIONS
卷 12, 期 2-3, 页码 142-152出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/mats.200390018
关键词
long-chain branching; metallocene catalysts; Monte Carlo simulation; polyethylene (PE); polyolefins; thermoplastic elastomers
This microstructure of polyolefinic thermoplastic elastomers made with a combination of two single-site catalysts was analyzed by Monte Carlo simulation. The model can be used to describe the crystallizable fraction for both long-chain branched polypropylene (aPP-g-iPP) and long-chain branched ethylene/alpha-olefin copolymers (PEalphaO-g-PE). The simulations showed that at levels of 7.5% of comonomer incorporation, PEalphaO-g-PE samples reach a similar crystallizability level of aPP-g-iPP. From a topological point of view, it was demonstrated that the fraction of free arms and inner segments tend to the limit of 1/2 for highly branched chains and that the fraction of free arms reaches its maximum value when the Y-type chains are the predominant population. A mathematical correlation between the linear- and LCB catalyst probabilities was proposed to ensure the production of symmetrical branched chains.
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