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A transparent rollable and foldable polysiloxane film and its preparation and self-healing method

A polysiloxane film, curling and folding technology, applied in the field of polymer materials, can solve the problems of unsuitable flexible and transparent electronic devices, poor strength and rigidity, short circuit of devices, etc., and achieve high toughness, high modulus, and high vitrification The effect of transition temperature

Active Publication Date: 2019-11-22
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for flexible and transparent electronic devices such as solar cells, flexible displays, capacitive touch screens, and FPCBs, the high-stretch PDMS-based self-healing materials reported above cannot be applied due to poor strength and rigidity.
In contrast, the prior art obtained a rigid PDMS-based cross-linked network by introducing trifunctional boroxane as the cross-linking point, and its Young's modulus and tensile strength reached 182 MPa and 9.46 MPa, respectively, both It is the highest value among current PDMS-based self-healing materials, but the elongation at break of this rigid PDMS-based cross-linked network is less than 10%. At the same time, the participation of water in the self-healing process is likely to cause the risk of device short circuit, so although it Excellent mechanical properties, but still not suitable for flexible transparent electronics

Method used

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  • A transparent rollable and foldable polysiloxane film and its preparation and self-healing method
  • A transparent rollable and foldable polysiloxane film and its preparation and self-healing method
  • A transparent rollable and foldable polysiloxane film and its preparation and self-healing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] 1) Preparation of hyperbranched polysiloxane (referred to as HPSi) containing amino groups at the end

[0051] According to mass, under the condition of temperature of 20℃, mix 100g of γ-aminopropyltriethoxysilane (KH550), 10g of water and 100g of ethanol evenly, raise the temperature to 60℃ and keep it warm for 4h; the obtained mixture After distilling off ethanol under reduced pressure, the hyperbranched polysiloxane (HPSi) containing amino groups at the end was obtained, and its H NMR spectrum and NMR silicon spectrum can be found in the attached figure 1 and 2 .

[0052] 2) Preparation of disulfide-containing isocyanate

[0053] In terms of mass, at a temperature of 20°C, mix 77g of 2,2'-dithiodiethanol, 224g of isophorone diisocyanate and 1000g of dichloromethane uniformly, raise the temperature to 60°C and keep it warm for 2 hours; After dichloromethane was distilled off from the resulting mixed solution under reduced pressure, the isocyanate containing disulfi...

Embodiment 2

[0078] 1) Preparation of hyperbranched polysiloxane (referred to as HPSi) containing amino groups at the end

[0079] In terms of mass, under the condition of 25°C, mix 100g of γ-aminopropyltriethoxysilane (KH550), 12.5g of water and 150g of methanol evenly, raise the temperature to 70°C and keep it warm for 5 hours; the resulting mixture After the methanol was distilled off under reduced pressure, the hyperbranched polysiloxane (HPSi) containing amino groups at the end was obtained.

[0080] 2) Preparation of disulfide-containing isocyanate

[0081] In terms of mass, at a temperature of 25°C, mix 77g of 2,2'-dithiodiethanol, 169g of hexamethylene diisocyanate and 1100g of chloroform evenly, raise the temperature to 70°C and keep it warm for 2.5h ; The resulting mixed solution is evaporated under reduced pressure in addition to chloroform to obtain isocyanates containing disulfides.

[0082] 3) Preparation of linear polydimethylsiloxane

[0083] By mass, at a temperature of...

Embodiment 3

[0089] 1) Preparation of hyperbranched polysiloxane (referred to as HPSi) containing amino groups at the end

[0090] In terms of mass, at a temperature of 30°C, mix 100g of γ-aminopropyltriethoxysilane (KH550), 15g of water and 200g of n-propanol uniformly, raise the temperature to 80°C and keep it warm for 6 hours; the obtained After the mixture was distilled off the n-propanol under reduced pressure, the hyperbranched polysiloxane (HPSi) containing amino groups at the end was obtained.

[0091] 2) Preparation of disulfide-containing isocyanate

[0092] In terms of mass, at a temperature of 30°C, mix 77g of 2,2'-dithiodiethanol, 264g of dicyclohexylmethane diisocyanate and 1200g of 1,2-dichloroethane uniformly, raise the temperature to 80°C and Insulated reaction for 3 hours; the obtained mixture was evaporated under reduced pressure to remove 1,2-dichloroethane to obtain disulfide-containing isocyanate.

[0093] 3) Preparation of linear polydimethylsiloxane

[0094] By m...

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Abstract

The invention discloses a transparent rollable and foldable polysiloxane film and its preparation and self-repairing method. Add 2,2'-dithiodiethanol and diisocyanate to chlorinated alkanes for chain extension reaction to obtain disulfide-containing isocyanate; bis(3-aminopropyl)-blocked polydimethylsiloxane and di Isocyanate is added to chlorinated alkanes, and linear polydimethylsiloxane is obtained by chain extension reaction; linear polydimethylsiloxane and terminal hyperbranched polysiloxanes containing amino groups are dissolved in chloroalkanes, and dimethicone-containing The isocyanate of thioether is mixed evenly, poured into a mold, and dried to obtain a transparent rollable and foldable polysiloxane film. The present invention makes the prepared polysiloxane film have both rigidity and toughness through dynamic physical crosslinking of hydrogen bonds and permanent chemical crosslinking of hyperbranched polysiloxane at room temperature, while dissociation of hydrogen bonds and The disulfide exchange endows the prepared polysiloxane film with good reversible self-healing properties.

Description

technical field [0001] The invention relates to a polymer film and a preparation method thereof, in particular to a transparent rollable and foldable polysiloxane film and a preparation and self-repairing method thereof, belonging to the technical field of polymer materials. Background technique [0002] With the rapid development of transparent optoelectronic devices such as solar cells, sensors, flexible displays, touch screens and flexible printed circuit boards (FPCBs), flexible electronic devices with high transmittance are gradually becoming a research hotspot and direction. Organic electronic devices are usually multilayer structures, mainly composed of substrates (such as silicon wafers, glass or plastics), dielectrics, semiconductors (or active layers) and conductive electrodes. Among them, organic electronic devices based on silicon wafers or glass lead to devices with great rigidity and only extremely limited bending. Therefore, at present, flexible and transpare...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/18C08L75/02C08L83/08C08K5/36C08G77/26C08G18/61C08J7/00
CPCC08G18/61C08G77/26C08J5/18C08J7/08C08J2383/08C08K5/36C08J2483/08C08J2375/02
Inventor 梁国正张又豪顾嫒娟袁莉
Owner SUZHOU UNIV
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