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

Jing Tao; Bang-kun Jin; Li-ying Li; Chen He; Wei-dong He

doi:10.1007/s10118-013-1296-6

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

RAPID COMMUNICATION | Updated：2023-01-03

- CLICK CYCLIZATION OF LINEAR TRIBLOCK COPOLYMERS AT BLOCK JUNCTIONS UNDER HIGH CONCENTRATION DUE TO END-BLOCK SHIELDING
- Chinese Journal of Polymer Science Vol. 31, Issue 7, Pages: 959-965(2013)
- Affiliations：
  
  CAS Key Laboratory of Soft Matter Chemistry, Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei 230026, China
- Author bio：
  
  **Wei-dong He (何卫东), E-mail: wdhe@ustc.edu.cn
- Funds：
- DOI：10.1007/s10118-013-1296-6
  CLC：
- Received：21 February 2013，
  
  Revised：2013-03-05，
  
  Accepted：12 March 2013，
  
  Published：2013-07
- Accepted：
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Jing Tao, Bang-kun Jin, Li-ying Li, et al. 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：

Jing Tao, Bang-kun Jin, Li-ying Li, et al. 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.

摘要

Abstract

Linear triblock copolymers of poly(

-isopropylacrylamide) (PNIPAM) and poly(ethylene glycol) (PEG) with two azide groups at both block junctions (PNIPAM-N

-PEG-N

-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-N

-PEG-N

-PNIPAM remains separated although PNIPAM end blocks keep in contact under this high concentration. Therefore

PNIPAM-N

-PEG-N

-PNIPAM undergoes self-cyclization at block junctions to form tadpole-shaped architecture while N

-PEG-N

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.

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