The change in the intrinsic viscosity with random chain scission. I. Narrow initial molecular weight distributions

1962 ◽  
Vol 61 (171) ◽  
pp. S25-S28 ◽  
Author(s):  
A. M. Kotliar
Keyword(s):  
Molecular Weight ◽  
Intrinsic Viscosity ◽  
Chain Scission ◽  
Molecular Weight Distributions ◽  
Weight Distributions

scholarly journals Preparation and Intrinsic Viscosity of Poly-(N-methyl-2-vinylpyridinium chloride) with Narrow Molecular Weight Distributions

1990 ◽  
Vol 22 (12) ◽  
pp. 1077-1083 ◽  
Author(s):  
Masayoshi Yamaguchi ◽  
Yoshikazu Yamaguchi ◽  
Yushu Matsushita ◽  
Ichiro Noda
Keyword(s):  
Molecular Weight ◽  
Intrinsic Viscosity ◽  
Molecular Weight Distributions ◽  
Weight Distributions

Mechanical Degradation of Polymers

1965 ◽  
Vol 38 (3) ◽  
pp. 509-516
Author(s):  
C. Booth
Keyword(s):  
Molecular Weight ◽  
Molecular Weight Distribution ◽  
Weight Distribution ◽  
Degradation Products ◽  
Chain Scission ◽  
Mechanical Degradation ◽  
Narrow Molecular Weight Distribution ◽  
Molecular Weight Distributions ◽  
Weight Distributions

Abstract A sample of polyisoprene having a narrow molecular weight distribution has been degraded mechanically in several ways and molecular weight distributions of the degradation products have been determined. From these data we conclude that chain scission occurs at a point far removed from the ends, but not necessarily near the center, of the molecules.

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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