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A kind of siloxane side chain liquid crystal elastomer and the smart watch prepared therefrom

A liquid crystal elastomer and siloxane technology, which is applied in the field of smart watches, can solve the problems of reducing the battery life of smart watches, unfavorable physical conditions of the human body, and increasing the power consumption of smart watches.

Active Publication Date: 2018-03-30
BOE TECH GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The temperature measurement module in the existing smart watch will increase the power consumption of the smart watch and reduce the battery life of the smart watch. At the same time, this function will be lost when the watch is out of power, which is not conducive to the monitoring of the physical condition of the human body.

Method used

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  • A kind of siloxane side chain liquid crystal elastomer and the smart watch prepared therefrom
  • A kind of siloxane side chain liquid crystal elastomer and the smart watch prepared therefrom
  • A kind of siloxane side chain liquid crystal elastomer and the smart watch prepared therefrom

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Embodiment 1 A kind of siloxane side chain liquid crystal elastomer

[0039] This embodiment provides a siloxane side chain liquid crystal elastomer, structural diagram figure 1 As shown, it is obtained by grafting a crosslinking agent 423 and a liquid crystal monomer 422 onto a polymethylhydrogensiloxane main chain 421 through a hydrosilylation reaction;

[0040] Wherein, the grafting ratio of the crosslinking agent and the liquid crystalline monomer to the polymethylhydrogensiloxane main chain is 1:3.

[0041] Described linking agent is p-alkenyloxybenzoic acid binaphthyl diphenol ester, and its structural formula is as follows:

[0042]

[0043] In the formula, n is 10.

[0044] The liquid crystal monomer is cholesteryl p-alkenyloxybenzoate, and its structural formula is as follows:

[0045]

[0046] In the formula, n is 10.

[0047] Described polymethyl hydrogen siloxane structural formula is as follows:

[0048]

[0049] In the formula, m is 6.

[005...

Embodiment 2

[0051] Embodiment 2 A kind of siloxane side chain liquid crystal elastomer

[0052] This embodiment provides a siloxane side chain liquid crystal elastomer similar to that of Embodiment 1, the only difference being that

[0053] 1) The grafting ratio of the crosslinking agent and the liquid crystalline monomer to the polymethylhydrogensiloxane main chain is 1:1.

[0054] 2) The cross-linking agent is that n is 8 in p-alkenyloxybenzoic acid binaphthyl ester.

[0055] 3) The liquid crystal monomer is cholesteryl p-alkenyloxybenzoate in which n is 8.

[0056] 4) m in the polymethylhydrogensiloxane is 8.

[0057] The glass transition temperature of the obtained siloxane side chain liquid crystal elastomer is 30°C, and it presents a cholesteric phase above the glass transition temperature. In addition, there is no reflection color, and it is shown as a transparent state. When it is at 38°C, its selective reflection wavelength is 750nm, and it reflects red.

Embodiment 3

[0058] Embodiment 3 A kind of siloxane side chain liquid crystal elastomer

[0059] This embodiment provides a siloxane side chain liquid crystal elastomer similar to that of Embodiment 1, the only difference being that

[0060] 1) The grafting ratio of the crosslinking agent and the liquid crystalline monomer to the polymethylhydrogensiloxane main chain is 1:2.

[0061] 2) The cross-linking agent is 12 n in the p-alkenyloxybenzoic acid binaphthyl ester.

[0062] 3) The liquid crystal monomer is cholesteryl p-alkenyloxybenzoate in which n is 12.

[0063] 4) m in the polymethylhydrogensiloxane is 10.

[0064] The obtained siloxane side chain liquid crystal elastomer has a glass transition temperature of 28°C, and exhibits a cholesteric phase above the glass transition temperature. For example, at 37°C, its selective reflection wavelength is 750nm, showing red; at 38°C , its selective reflection wavelength is 620nm, reflecting green.

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Abstract

The invention relates to a siloxane side chain liquid crystal elastomer and a smart watch prepared therefrom. The siloxane side chain liquid crystal elastomer is obtained by grafting a crosslinking agent and a liquid crystal monomer onto a polymethylhydrogensiloxane main chain through a hydrosilylation reaction. In the present invention, a liquid crystal elastomer is obtained by grafting a specific cross-linking agent and a liquid crystal monomer onto the main chain of polymethylhydrogen siloxane, and its selective reflection wavelength can change with temperature, and then change color ; The temperature-sensitive liquid crystal display module prepared by it is used in a smart watch to realize the function of automatically sensing human body temperature without power consumption.

Description

technical field [0001] The invention relates to a siloxane side chain liquid crystal elastomer and a smart watch prepared therefrom, belonging to the field of liquid crystal materials. Background technique [0002] With the development of mobile technology, many traditional electronic products have also begun to add mobile functions. For example, watches that used to tell the time in the past can also be connected to the Internet through smart phones or home networks to display incoming call information, news, weather information etc. A smart watch is a watch with a built-in intelligent system, equipped with a smart phone system, and connected to the network to achieve multi-functions. It can synchronize phone calls, text messages, emails, photos, music, etc. in the phone. With the improvement of people's living standards, the demand for health care and other functions of smart watches is getting higher and higher. Some smart watches can already check heart rate, walking s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G77/42G02F1/1335
CPCA61B5/01A61B2562/0271C08G77/38C09K19/36C09K19/408C09K2019/323G02F1/0147G04G17/00
Inventor 武晓娟王建
Owner BOE TECH GRP CO LTD
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