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Types of Step-Growth Polymers: Polyesters01:20

Types of Step-Growth Polymers: Polyesters

The introduction of polyesters has brought major development to the textile industry. The wrinkle-free behavior of polyester blends has eliminated the need for starching and ironing clothes.
Polyesters are commonly prepared from terephthalic acid and ethylene glycol; the crude product is known as poly(ethylene terephthalate) or PET. However, polyesters are synthesized industrially by transesterification of dimethyl terephthalate with ethylene glycol at 150 °C. The two reactants and the polymer...

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Solution-processed high-k photopatternable polymers for low-voltage electronics.

Qingqing Sun1, Hongwei Ge1, Shuai Wang1

  • 1School of Materials Science and Engineering, State Key Laboratory of Structural Analysis, Optimization and CAE Software for Industrial Equipment, National Engineering Research Center for Advanced Polymer Processing Technology Zhengzhou University, Zhengzhou 450001, China. liuxy@zzu.edu.cn.

Materials Horizons
|August 29, 2024
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Summary
This summary is machine-generated.

New high-dielectric-constant (high-k) polymers were synthesized using UV crosslinking for flexible electronics. These polymers offer high performance, stability, and patternability, enabling low-voltage transistors and advanced applications like artificial optic nerves.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Organic Electronics

Background:

  • High dielectric constant (k) polymers are crucial for flexible, low-power electronic devices.
  • Existing materials often require high processing temperatures or lack sufficient stability.

Purpose of the Study:

  • To design and synthesize solution-processable high-k polymers with UV-triggered crosslinking at low temperatures.
  • To evaluate their performance in electronic devices, focusing on dielectric properties, stability, and patternability.

Main Methods:

  • Synthesis of high-k polymers via UV-triggered crosslinking at 60 °C.
  • Characterization of crosslinked polymer network properties (solvent resistance, breakdown strength).
  • Fabrication and testing of Indium Gallium Zinc Oxide (IGZO) thin-film transistors (TFTs) and flexible organic TFTs.

Main Results:

  • Achieved high dielectric constant (k) up to 10 due to polar cyano pendants.
  • Demonstrated high breakdown strength (> 2 MV cm⁻¹), solvent resistance, and 1 μm feature size patterning.
  • Fabricated low-voltage (5 V) IGZO TFTs with high field-effect mobility (> 20 cm² V⁻¹ s⁻¹).
  • Developed flexible TFTs with excellent mechanical stability (1000 cycles at 5 mm bending radius) and radiation stability.

Conclusions:

  • UV-crosslinkable high-k polymers offer a promising route for fabricating high-performance, stable, and flexible electronic devices.
  • The developed materials enable low-voltage operation and advanced applications, including pattern recognition for artificial optic nerve circuits.