Citation: Jing Tao, Bang-kun Jin, Li-ying Li, Chen He, Wei-dong He. CLICK CYCLIZATION OF LINEAR TRIBLOCK COPOLYMERS AT BLOCK JUNCTIONS UNDER HIGH CONCENTRATION DUE TO END-BLOCK SHIELDING[J]. Chinese Journal of Polymer Science, ;2013, 31(7): 959-965. doi: 10.1007/s10118-013-1296-6 shu

CLICK CYCLIZATION OF LINEAR TRIBLOCK COPOLYMERS AT BLOCK JUNCTIONS UNDER HIGH CONCENTRATION DUE TO END-BLOCK SHIELDING

Corresponding author: Wei-dong He,
Received Date: 21 February 2013
Revised Date: 12 March 2013

Fund Project: This work was financially supported by the National Natural Scientific Foundation of China (Nos. 20934005 and 21274136).

Linear triblock copolymers of poly(N-isopropylacrylamide) (PNIPAM) and poly(ethylene glycol) (PEG) with two azide groups at both block junctions (PNIPAM-N3-PEG-N3-PNIPAM) are click reacted with dipropargyl oxalylate under high polymer concentration (250 g/L). Benefiting from rapid feature of alkyne-azide click reaction and spatial shielding of PNIPAM end blocks, PEG center block of PNIPAM-N3-PEG-N3-PNIPAM remains separated although PNIPAM end blocks keep in contact under this high concentration. Therefore, PNIPAM-N3-PEG-N3-PNIPAM undergoes self-cyclization at block junctions to form tadpole-shaped architecture while N3-PEG-N3 without PNIPAM end blocks inter-connects linearly. The influence of block lengths of PEG and PNIPAM on the unusual cyclization under high polymer concentration is studied.
- Self-cyclization
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