Citation: Ya-Di Liu, Qiang Zhang, Xin-Hong Yu, Jian-Gang Liu, Yan-Chun Han. Increasing the Content of β Phase of Poly(9,9-dioctylfluorene) by Synergistically Controlling Solution Aggregation and Extending Film-forming Time[J]. Chinese Journal of Polymer Science, ;2019, 37(7): 664-673. doi: 10.1007/s10118-019-2259-3 shu

Increasing the Content of β Phase of Poly(9,9-dioctylfluorene) by Synergistically Controlling Solution Aggregation and Extending Film-forming Time

a.
State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
b.
University of Science and Technology of China, Hefei 230026, China

Corresponding author: Jian-Gang Liu, niitawh@ciac.ac.cn Yan-Chun Han, ychan@ciac.ac.cn
Received Date: 25 January 2019
Revised Date: 14 March 2019
Available Online: 24 April 2019

For poly(9,9-dioctylfluorene) (PFO), β phase (coplanar conformation with the intra-chain torsion angle of 165°) has a greater conjugation length and higher degree of order compared to those of α phase, which favors charge carrier transport. However, the highest content of β phase obtained so far is 45%. We propose to increase the content of β phase by promoting the solution aggregation of PFO molecules and extending film-forming time. For this purpose, 1,8-diiodooctane (DIO) is added to PFO o-xylene solution, which enhances the interaction of PFO chains and improves the planarity of PFO backbone, resulting in the formation of ordered aggregation. The aggregates act as nucleation centers to promote the formation of β phase. The content of β phase increases with increasing DIO concentration and reaches a platform of 39% as DIO is more than 4 vol%. Furthermore, the film is kept in a sealed environment with o-xylene atmosphere for 3 h, thus the PFO molecules have enough time to diffuse to the crystallization front and achieve disorder-order transition. As a result, the crystallinity of PFO is improved significantly and the content of β phase increases to 52%, reaching the highest value reported so far.
- β Phase,
- Ordered aggregation,
- Film-forming time,
- Disorder-order transition
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沈阳化工大学材料科学与工程学院沈阳 110142