期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 142, 期 8, 页码 3691-3695出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.9b13485
关键词
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资金
- Maxwell computational resources operated at Deutsches Elektronen-Synchrotron (DESY), Hamburg, Germany
- Netherlands Organization for Scientific Research (NWO) in the frame of a NWO-TA grant [731.015.203]
- SABIC
- DSM Resolve
- University of Maastricht
- VIDI grant [723.015.007]
A combination of X-ray ptychography and X-ray fluorescence tomography (XRF) has been used to study the fragmentation behavior of an individual Ziegler-Natta catalyst particle, similar to 40 mu m in diameter, in the early stages of propylene polymerization with submicron spatial resolution. The electron density signal obtained from X-ray ptychography gives the composite phases of the Ziegler-Natta catalyst particle fragments and isotactic polypropylene, while 3-D XRF visualizes multiple isolated clusters, rich in Ti, of several microns in size. The radial distribution of Ti species throughout the polymer-catalyst composite particle shows that the continuous bisection fragmentation model is the main contributor to the fragmentation pathway of the catalyst particle as a whole. Furthermore, within the largest Ti clusters the fragmentation pathway was found to occur through both the continuous bisection and layer-by-layer models. The fragmentation behavior of polyolefin catalysts was for the first time visualized in 3-D by directly imaging and correlating the distribution of the Ti species to the polymer-catalyst composite phase.
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