Abstract
The negative effect that a RAFT agent with a poor leaving group has on the evolution of molecular dispersity in a RAFT-mediated polymerization was shown to be mitigated by performing the polymerization in semi-batch mode.
Highlights
Radical polymerization is one of the most commonly used methods for synthesizing commercial polymers since it is a robust method to prepare polymeric materials.[1,2,3] A high tolerance to impurities and many different functional groups makes radical polymerization preferable over ionic polymerization for industrial processes
RAFT-mediated polymerization is compatible with virtually all monomer classes that are accessible via conventional radical polymerization
The focus of the current study is to demonstrate the versatility of RAFT agents considered to bear a relatively poor leaving group, by improving the Đ value through the adjustment of reaction conditions to the use of a semi-batch process
Summary
Radical polymerization is one of the most commonly used methods for synthesizing commercial polymers since it is a robust method to prepare polymeric materials.[1,2,3] A high tolerance to impurities and many different functional groups makes radical polymerization preferable over ionic polymerization for industrial processes. In starved feed emulsion polymerization experiments they reach dispersities (Đ) as low as 1.2–1.3.23 Similar experiments conducted in solution show values of Đ ≅ 1.5.22 The manipulation of the monomer-to-RAFT agent ratio to improve control over the polymerization can be used to address either the R- or Z-group effect of the RAFT agent.
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