Snu Rdb Foundation

Seoul National University

Tae-Lim Choi

Sanghee Yang

Sung-Yun Kang

Kookheon Char

Jeewoo Lim

Yunshik Cho

Eun-Hye Kang

The present disclosure relates to a 2-dimensional polymer nanosheet, a device including the nanosheet and a method of morphologically tunable preparing the nanosheet. Two-dimensional (2D) polymer nanosheets have been attracting immense attention owing to their potential applications in optical devices, membranes, and catalysis. A new crystalline polyacetylene is described that contains fluorenes and triisopropylsilyl side chains, which could self-assemble into sharp-edged 5-nm-thick square nanosheets with a narrow length dispersity of 1.01, by simple heating and aging in dichloromethane (DCM). The addition of tetrahydrofuran (THF) or chloroform to the heated polymer solution in DCM changed the morphology from square to rectangle. The aspect ratios increased linearly, from 1.0 to 10.6, according to the amount of THF or chloroform added, while maintaining narrow length dispersities less than 1.06. These unique fluorescent semiconducting nanosheets with tunable shapes exhibit high potential for optoelectronic applications.

2-dimensional polymer nanosheets and method for morphologically tunable preparing the same

Semi-conducting two-dimensional (2D) nanoobjects, prepared by self-assembly of conjugated polymers, are promising materials for optoelectronic applications. However, there has been no example of 2D nanosheets with controlled lengths and aspect ratios at the same time via self-assembly. Herein, the inventors successfully prepared uniform semi-conducting 2D sheets using a conjugated poly(cyclopentenylene vinylene) homopolymer and its block copolymer by blending and heating. Using these as 2D seeds, living crystallization-driven self-assembly (CDSA) was achieved by adding the homopolymer as a unimer. Interestingly, unlike typical 2D CDSA examples showing radial growth, this homopolymer assembled only in one direction. Owing to this uniaxial growth, the lengths of the 2D nanosheets could be precisely tuned with narrow dispersity according to the unimer-to-seed ratio. The inventors also studied the growth kinetics of the living 2D CDSA and confirmed first-order kinetics. Subsequently, the inventors prepared several 2D block comicelles (BCMs), including penta-BCMs in a one-shot method.

2-dimensional polymer nanosheet and width, length, and height tunable method of preparing the same

The present disclosure relates to a cyclic polysulfane-based polymer, a cyclic polysulfane-polynorbornene block copolymer, a method of preparing the cyclic polysulfane-based polymer, a method of preparing the cyclic polysulfane-polynorbornene block copolymer, and a film including the cyclic polysulfane-polynorbornene block copolymer.

Cyclic polysulfane-based polymer, method for preparing same, and film comprising same

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Seoul, South Korea

Tae-Lim Choi