scholarly journals Resolving Power and Separation Yield of the Molecular Weight Fractionation Method Based on Solubility Difference: A Computer Simulation Survey

1980 ◽  
Vol 12 (3) ◽  
pp. 153-159 ◽  
Author(s):  
Kenji Kamide ◽  
Yukio Miyazaki
Keyword(s):  
Molecular Weight ◽  
Computer Simulation ◽  
Resolving Power ◽  
Fractionation Method ◽  
Molecular Weight Fractionation

scholarly journals Multiplicity of Active-Site in Heterogeneous Ziegler-Natta Catalyst and Its Correlation with Polymer Microstructure

1970 ◽  
Vol 46 (4) ◽  
pp. 487-494
Author(s):  
ATM Kamrul Hasan
Keyword(s):  
Molecular Weight ◽  
Computer Simulation ◽  
Active Site ◽  
Photoelectron Spectroscopy ◽  
Active Sites ◽  
Chain Structure ◽  
Surface Complexes ◽  
Polymer Microstructure ◽  
Natta Catalyst ◽  
Ziegler Natta Catalyst

Multiplicity of active-site in heterogeneous Ziegler-Natta catalysts and its correlation with polymer microstructure was studied through the surface structure analysis of catalyst by computer simulation of X-ray Photoelectron Spectroscopy (XPS) data and microstructure investigation of polypropylene chains based on the deconvolution of the molecular weight distribution curves by multiple Flory most probable distributions using Gel Permeation Chromatography (GPC) method. The number and relative intensities of these peaks were found correlated to the distribution of multiple active sites. In this investigation, four individual categories of active sites were identified, each of which yields polypropylene with unique properties of molecular weight and chain structure different from other active sites. The reason of the multiplicity of active sites was determined by the presence of different locations of surface titanium species coordinated with other surface atoms or molecules. These different surface complexes of active species determine the multiple active site nature of catalyst which replicates the microtacticity, molecular weight and chain microstructure distribution of polymer. Keywords: Ziegler-Natta catalyst; Multiple active sites; Flory components; Computer simulation; Deconvolution; MWD. DOI: http://dx.doi.org/10.3329/bjsir.v46i4.9596 BJSIR 2011; 46(4): 487-494

The Molecular Weight Fractionation of Polypropylene

1969 ◽  
Vol 2 (6) ◽  
pp. 679-681 ◽  
Author(s):  
M. D. Baijal ◽  
R. M. Diller ◽  
F. R. Pool
Keyword(s):  
Molecular Weight ◽  
Molecular Weight Fractionation

scholarly journals Molecular weight fractionation by confinement of polymer in one-dimensional pillar[5]arene channels

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Tomoki Ogoshi ◽  
Ryuta Sueto ◽  
Masafumi Yagyu ◽  
Ryosuke Kojima ◽  
Takahiro Kakuta ◽  
...  
Keyword(s):  
Molecular Weight ◽  
One Dimensional ◽  
Molecular Weight Fractionation
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