Prediction of Molecular Weight Distributions for High-Density Polyolefins

1980 ◽  
Vol 19 (3) ◽  
pp. 372-379 ◽  
Author(s):  
Eric J. Nagel ◽  
Valery A. Kirillov ◽  
W. Harmon Ray
Keyword(s):  
Molecular Weight ◽  
High Density ◽  
Molecular Weight Distributions ◽  
Weight Distributions

Impact strength of high-density polyethylene with various molecular weight distributions

1975 ◽  
Vol 9 (5) ◽  
pp. 807-809
Author(s):  
A. N. Karasev ◽  
I. N. Andreeva ◽  
M. G. Karaseva ◽  
N. M. Domareva
Keyword(s):  
Molecular Weight ◽  
Impact Strength ◽  
High Density Polyethylene ◽  
High Density ◽  
Molecular Weight Distributions ◽  
Weight Distributions

The Use of Novel F-RAFT Agents in High Temperature and High Pressure Ethene Polymerization: Can Control be Achieved?

2007 ◽  
Vol 60 (10) ◽  
pp. 788 ◽  
Author(s):  
Markus Busch ◽  
Marion Roth ◽  
Martina H. Stenzel ◽  
Thomas P. Davis ◽  
Christopher Barner-Kowollik
Keyword(s):  
Molecular Weight ◽  
High Pressure ◽  
High Temperature ◽  
Degree Of Polymerization ◽  
Molecular Weight Distributions ◽  
High Pressure High Temperature ◽  
Reversible Addition ◽  
Weight Distributions ◽  
Raft Agent ◽  
Initial Results

Simulations are employed to establish the feasibility of achieving controlled/living ethene polymerizations. Such simulations indicate that reversible addition–fragmentation chain transfer (RAFT) agents carrying a fluorine Z group may be suitable to establish control in high-pressure high-temperature ethene polymerizations. Based on these simulations, specific fluorine (F-RAFT) agents have been designed and tested. The initial results are promising and indicate that it may indeed be possible to achieve molecular weight distributions with a polydispersity being significantly lower than that observed in the conventional free radical process. In our initial trials presented here (using the F-RAFT agent isopropylfluorodithioformate), a correlation between the degree of polymerization and conversion can indeed be observed. Both the lowered polydispersity and the linear correlation between molecular weight and conversion indicate that control may in principle be possible.

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