ABA type triblock
copolymers possessing polystyrene as middle segment and poly(ε-caprolactone)
(PCL) and poly(ethylene glycol) (PEG) as side segments were synthesized by
combining two photochemical strategies, namely photoinduced atom transfer
radical polymerization (ATRP) and click processes. For this purpose,
α,ω-diazido functional polystyrene (N3-PS-N3) was
synthesized by photoinduced ATRP using a bifunctional initiator, followed by a
simple substitution of the chain end halides. Parallel to this, alkyne-PCL was
synthesized by ring opening polymerization of ε-caprolactone, employing
propargyl alcohol as initiator. For the synthesis of alkyne-PEG, industrially
available PEG was functionalized by a simple esterification reaction using
5-pentynoic acid. After the syntheses of these alkyne functional polymers as
clickable counterparts, they were reacted with N3-PS-N3
by photoinduced click reactions to prepare the desired triblock copolymers. All
polymers were characterized by NMR, IR and GPC analyses.
Atom transfer radical polymerization Copper-catalyzed azide-alkyne cycloaddition Photochemistry block
Primary Language | English |
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Subjects | Chemical Engineering |
Journal Section | Articles |
Authors | |
Publication Date | January 1, 2018 |
Submission Date | April 10, 2018 |
Acceptance Date | April 18, 2018 |
Published in Issue | Year 2018 Volume: 5 Issue: 2 |