Block copolymers derived from macroinitiators

Block Copolymers Derived from Macroinitiators Recent Advances of Synthesis, Properties, and Applications... 

Another approach to block copolymers of the aromatic polyamide and coil polymer is the macroinitiator method the chain-growth condensation polymerization of 22a from a macroinitiator derived from coil polymer. A diblock... 

TMPAH was used successfully for the homo-, co-, and block polymerizations of IP. In this case, due to the less reactive diene monomer, no additional free nitroxide was necessary to control the polymerization and both low and high molecular weight polymers (Mn=4500 to Mn=100,000) with narrow molecular weight distributions (Mw/Mn= 1.07-1.3) were synthesized [159]. Copolymers with various styrene and (meth)acrylate derivatives, including acrylic acid and HEMA, were obtained, with the content of isoprene varying from 10% to 90% in the comonomer feed. Block copolymers were also produced, starting from either ptBA or pSt macroinitiators however, the alternate order of blocks (i.e., starting from a pIP macroinitiator) was only achieved with St. Chain extension with tBA resulted in inefficient initiation [159], as had been found for pSt-pnBA block copolymers [71]. 

The majority of the work reporting on use of commercially available macroinitiators to prepare block copolymers describes the use of macroinitiators derived from poly(ethylene glycol) (PEG), which can be used to produce amphiphilic block copolymers. These polymers contain hydroxy end-functionalities that can... 

Scheme 6 One-pot synthesis of P3HT-MI macroinitiators for NMRP using the McCullough method followed by in situ endcapping with the Grignard derivative of a common alkoxyamine initiator. Starting from these macroinitiators, the acceptor monomer PerAcr is polymerized to give fully functionalized, double-crystalline block copolymers P3HT-/ -PPerAcr...

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