Hardness and Abrasion Resistance Characteristics of Poly(ethylene terephthalate) Films without and with Hard and Adhesive Coatings

Low, Zi Jia; Wong, Jia Chyi; Ngoi, Kuan Hoon; Chia, Chin Hua; Kim, Hyun‐Joong; Kim, Hong-Chul; Ree, Moonhor

doi:10.1007/s13233-021-9030-7

Cited by 11 publications

(3 citation statements)

References 21 publications

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“…Display cover windows, [ 17–21 ] which consist of a flexible transparent window film and a flexible transparent protective coating layer, are a promising solution for the abovementioned problems in the fabrication of flexible displays. For the successful application of display cover windows, both the window film and protective coating layer should meet the following requirements: 1) good optical properties, comparable to those of cover glass substrates, 2) robust in‐plane and out‐of‐plane mechanical properties, 3) excellent mechanical durability and folding reliability over hundreds of thousands of folding cycles, [ 22–25 ] and 4) easy processability and facile mass production.…”

Section: Introductionmentioning

confidence: 99%

Highly Transparent, Colorless Optical Film with Outstanding Mechanical Strength and Folding Reliability Using Mismatched Charge‐Transfer Complex Intensification

Ahn

Kim

Hong

et al. 2022

Adv Funct Materials

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The development of flexible displays and electronics is hindered by the disadvantages of polymeric window films, such as low mechanical strength, poor optical properties, and lack of folding and rolling reliability. To overcome these critical limitations, a novel colorless polyimide window film is prepared in this study using the concept of charge‐transfer complex (CTC) intensification. The resulting window film has a tensile modulus of 8.4 GPa, total transmittance of ≈90%, and yellow index below 3, which is the best recorded balance between mechanical strength and optical properties for a highly flexible optical film. Unlike commercially available optical‐grade engineering plastic films and glass substrates, the prepared window film has both pencil hardness grade over 2H and folding reliability over 200 000 folding/unfolding cycles. These remarkable properties are attributed to the unique supramolecular structure with multiple hydrogen bonding and salt complexation interactions, which exhibits CTC intensification. The CTC intensification mechanism is also proposed in this study.

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Section: Introductionmentioning

confidence: 99%

Highly Transparent, Colorless Optical Film with Outstanding Mechanical Strength and Folding Reliability Using Mismatched Charge‐Transfer Complex Intensification

Ahn

Kim

Hong

et al. 2022

Adv Funct Materials

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“…Functional coatings like transparent polyester films have found many applications in optoelectronics devices as base films and are usually hardened with UV resin that is coated on the surface to improve abrasion resistance. − However, due to the mismatch of the refractive index (RI) between the base film and the hard coating (HC) film, the hardened polyester film is prone to the phenomenon of reflected light interference, that is, the rainbow effect. , The presence of rainbow patterns will affect the light transmittance and visual performance of the display products . To reduce the number of existing polyester rainbow patterns, several technologies have been developed.…”

Section: Introductionmentioning

confidence: 99%

Ultrastable Waterborne Nanocomposite Coating of Polyurethane and Zirconia Nanoparticles To Avoid Rainbow Effect on Polyester-Based Superficial Hardening Films

Liu,

Wang,

Zhang

et al. 2023

Ind. Eng. Chem. Res.

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Transparent nanocomposites constructed by adding ultrasmall inorganic nanoparticles into an organic polymer matrix have been a new paradigm for preparing functional films for various optical components. Herein, aiming to avoid the negative influences of the rainbow effect on polyester film optoelectronic devices, a transparent nanocomposite of waterborne polyurethane (WPU) and ZrO 2 nanoparticles is reported. The water-dispersible nanoparticles of ZrO 2 modified with citric acid (CA) are first synthesized, which ensures homogeneous blending of ZrO 2 nanoparticles and WPU emulsions. The ZrO 2 @CA nanoparticles can be well dispersed in the alkaline aqueous solution with a solid content of 5 wt %. The ZrO 2 /WPU hybrid films exhibit high transparency of visible light and the products of polyester-based hard coating films without rainbow effect are successfully prepared by using the ZrO 2 /WPU hybrid films as a functional layer for interference cancellation. This work demonstrates an efficient approach for developing water-dispersible ultrasmall ZrO 2 nanoparticles and nanoparticle-derived transparent nanocomposites for advanced applications in optics.

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“…Since the advent of the fourth industrial revolution, a majority of problem solving has been sought to deal first with data (i.e., digital information) being explosively generated on a daily basis. In fact, digital information is known to be newly generated in the increasing rate of 40% per year. − In particular, electronic devices of various sizes have appeared in order to meet consumers’ demands as represented by smart and foldable phones and other portable devices. − Therefore, a new generation of high-performance memory devices with a higher density, lower power consumption, and faster speed are urgently desired to store and process the huge amount of data being daily generated. However, the current silicon (Si)-based memory technology has some limitations.…”

Section: Introductionmentioning

confidence: 99%

n-Type Digital Memory Characteristics of Diketopyrrolopyrrole-Based Narrow Bandgap Polymers

Jung

Kim

et al. 2021

J. Phys. Chem. C

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New π-conjugated polymers based on dithienyl-diketopyrrolopyrrole (dtDPP) were synthesized by direct arylation polymerization, that is, poly(dtDPP), poly(dtDPP-FL), and poly(dtDPP-TPA). They revealed extremely low bandgaps, which could be achieved by controlling the donor−acceptor powers among the backbone building blocks. They were all thermally stable up to 250 °C and, furthermore, solutionprocessible in conventional ways, producing good-quality thin films. Poly(dtDPP) favorably self-assembled, forming an edge-on layer structure in nanoscale films, whereas the others were preferentially oriented within the film plane without any regular packing structures. All the dt-DPP-based polymers as active layers in devices demonstrated highperformance n-type digital memories (low switching voltage, high ON/OFF current ratio, and high stability) because of the narrow bandgaps. Moreover, the memory modes (nonvolatile and volatile) could be tuned by adjusting the donor−acceptor powers in the backbone. Overall, the dtDPP-based polymers are suitable for the low-cost mass production of n-type nonvolatile and volatile high performing memory devices. In addition, this study provides a guideline on how to achieve high-performance n-type digital memories by balancing the donor and acceptor powers among the chemical building blocks.

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Hardness and Abrasion Resistance Characteristics of Poly(ethylene terephthalate) Films without and with Hard and Adhesive Coatings

Cited by 11 publications

References 21 publications

Highly Transparent, Colorless Optical Film with Outstanding Mechanical Strength and Folding Reliability Using Mismatched Charge‐Transfer Complex Intensification

Highly Transparent, Colorless Optical Film with Outstanding Mechanical Strength and Folding Reliability Using Mismatched Charge‐Transfer Complex Intensification

Ultrastable Waterborne Nanocomposite Coating of Polyurethane and Zirconia Nanoparticles To Avoid Rainbow Effect on Polyester-Based Superficial Hardening Films

n-Type Digital Memory Characteristics of Diketopyrrolopyrrole-Based Narrow Bandgap Polymers

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