Synthesize 4-arm poly(2-vinylpyridine) star polymer using bromomethyl benzene derivative as linking agent
Propose one-stage methods for the synthesis of styrene-maleic anhydride triblock copolymers using the RAFT technique. Draw appropriate schemes and formulas.
One-stage synthesis of triblock copolymers Bifunctional OPC agent - chain growth at two ends
Stirol> maleic anhydride
30.Synthesize 3-arm star-block copolymer based on (polystyrene-b-polyisoprene) diblock copolymer using suitable linking agent.
Three-arm star block copolymers were successfully synthesized by combination of “core-first” and “coupling-onto” strategies. First, polystyrene 3-arm star polymers (PS-Br)3 with high bromine chain-end functionality were synthesized by atom transfer radical polymerization (ATRP) using the core-first method. After complete transformation of the bromo groups to azido groups by nucleophilic substitution with sodium azide, the product (PS-N3)3 was used for click reactions with alkyne-terminated poly(ethylene oxide) chains (PEO-alkyne) and produced 3-arm star block copolymers (PS-b-PEO)3 via the coupling-onto method.
This is the reaction of star-block copolymaryzation of polystyrene and polyisoprene: 
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