Citation: Zhonghui Du, Hang Zhou, Weiran Cao, Xinhong Yu, Yanchun Han. The effects of coil-stretch transition behavior of polyfluorene inks on single droplet formation during inkjet printing[J]. Chinese Chemical Letters, ;2020, 31(12): 3216-3220. doi: 10.1016/j.cclet.2020.03.067 shu

The effects of coil-stretch transition behavior of polyfluorene inks on single droplet formation during inkjet printing

Zhonghui Du ^{a, b} ,
Hang Zhou ^a ,
Weiran Cao ^b ,
Xinhong Yu ^{c, *,} ,
Yanchun Han ^{c, *,}

a.
Shenzhen Key Lab of Thin Film Transistor and Advanced Display, Peking University Shenzhen Graduate School, Peking University, Shenzhen 518055, China
b.
Shenzhen China Star Optoelectronic Semiconductor Display Technology Co., Ltd., Shenzhen, 518132 China
c.
State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China

xhyu@ciac.ac.cn

ychan@ciac.ac.cn

Available Online: 17 April 2020

Figures(9)

For drop-on-demand (DOD) inkjet printing, stable and single ink droplet formation without satellite dots is the key to improve the print quality. The formation of stable and single droplet is influenced by filament break up and the polymer chain's coil-stretch transition behavior. In this paper, the droplet formation behaviors of polyfluorene (PFO) ink at various driving voltages (V), polymer chain's coil-stretch transition mechanism and its effects on single ink droplet formation are investigated. It indicates that when 58 < V ≤ 63 V, a single and stable droplet is formed with a pulse time of 38.5 μs. At this stage, the Weissenberg number (Wi) < 0.5, the PFO molecular chain is coiled to guarantee stable and single droplets. When V > 63 V, Wi > 0.5, the PFO molecular chain is stretched because of the high hydrodynamic forces, resulting unwanted satellite droplets. When 55 < V ≤ 58 V, the droplet shrinks into the nozzle, which indicates that the kinetic energy supplied by the deformation of the piezoelectric transducer isn't enough to force the droplet to be jetted from the nozzle.
- Driving voltage,
- Polyfluorene,
- Single droplet,
- Satellite droplets,
- Coil-stretch
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