Citation: Chi Shuai-Jie, Chen Liang, Liu Jian-Gang, Yu Xin-Hong, Han Yan-Chun. Influence of bifurcation position and length of side chains on the structure of isoindigo-based conjugated polymer thin films[J]. Chinese Chemical Letters, ;2017, 28(2): 333-337. doi: 10.1016/j.cclet.2016.09.005 shu

Influence of bifurcation position and length of side chains on the structure of isoindigo-based conjugated polymer thin films

a.
State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
b.
University of the Chinese Academy of Sciences, Beijing 100049, China

Corresponding author: Liu Jian-Gang, niitawh@ciac.ac.cn Han Yan-Chun, ychan@ciac.ac.cn
Received Date: 25 July 2016
Revised Date: 17 August 2016
Accepted Date: 29 August 2016
Available Online: 21 February 2016

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We chose a series of isoindigo-based conjugated polymer (IIDDT, IIDDT-C3 and IIDDT-C4) with different length of side chains and bifurcation positions to investigate the relationship between the degree of alignment and the length of side chains and bifurcation positions. We found that the dichroic ratio was increased from 2.37 to 5.23 when the side chain was longer and the bifurcation position was away from the backbone. The π-π stacking distance was decreased from 3.67 Å to 3.61 Å when the bifurcation position was away from the backbone because of its smaller hindrance and the d-spacing of the (100) was increased from 20.06 Å to 25.21 Å when the side chain was longer. All the polymers were adopted an edge-on orientation with the backbone paralleled with the long axis of fibers. The weak interaction of side-chain in IIDDT-C4 was beneficial for the molecules being rearranged in parallel during the contact line receding and the strong π-π interaction could accelerate the interchain assembly of the parallel molecules through π-π interaction to form aligned fibers.
- Isoindigo-based conjugated polymers,
- Alignment,
- The length of side chains,
- Bifurcation positions,
- π-π interaction
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