期刊
SOFT MATTER
卷 15, 期 14, 页码 2981-2989出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9sm00370c
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资金
- National Natural Science Foundation of China [51773182, 11872338, U1804144]
- China Postdoctoral Science Foundation [2016M592302, 2018T110741]
- Outstanding Young Talent Research Fund of Zhengzhou University [1521320004]
- Startup Research Fund of Zhengzhou University [1512320001]
A wide range of possible applications in sensors and optoelectronic devices have focused considerable attention on porous membranes made of semi-conducting polymers. In this study, porous films of poly(3-hexylthiophene) (P3HT) were conveniently constructed through spin-coating of solutions of a blend of P3HT and polyethylene glycol (PEG). Pores were formed by phase separation driven simultaneously by incompatibility and crystallization. The influence of the polymer concentration (c), molecular weight (M-n) and spin-coating temperature (T-sp) on the pore size and structure was investigated. With increasing c from 0.5 to 5.0 wt%, the pore diameter (d) varied from approximate to 1.3 m to approximate to 38 m. Similarly, we observed a substantial increase of d with increasing M-n of PEG, while changing M-n of P3HT did not affect d. Micron- and nano-scale pores coexisted in porous P3HT films. While incompatibility of P3HT and PEG caused the formation of nano-pores, micron-scale pores resulted from crystallization in the PEG-rich domains by forcing PEG molecules to diffuse from the surrounding PEG-P3HT blend region to the crystal growth front.
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