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Modified polysiloxane and application thereof

A polysiloxane and modification technology, applied in the field of modified polysiloxane, can solve the problems of complicated preparation methods, achieve unique application prospects, and improve the effect of temperature-sensitive performance

Active Publication Date: 2019-09-10
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation method of this technical solution is cumbersome, and it is necessary to prepare temperature-sensitive cadmium telluride quantum dots first, then add PDMS prepolymer and curing agent after purification and dispersion, and hang the mixture on a glass slide, and place it in an oven for curing to obtain temperature-sensitive PDMS. film

Method used

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  • Modified polysiloxane and application thereof
  • Modified polysiloxane and application thereof
  • Modified polysiloxane and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0118] Embodiment 1 temperature-sensitive polymer material based on hydrogen bond

[0119] Step 1: In a dry four-neck flask equipped with a thermometer, a condenser, a dropping funnel, and an Ar inlet, add 150 g of anhydrous toluene, start stirring, and add 72 g of allyl glycidyl ether (0.63 mol) to the toluene , and then 37.5g hydrogen content is 1.6wt% (Mn~3000, wherein, R 1 -R6 is a methyl group, m is 0, n is a value in the range of 40 to 55, and 0.6 mol per mole of Si-H) polyalkylhydrosiloxane is added to the mixed reaction system of toluene and allyl glycidyl ether middle. Then 20mg of Karstedt platinum catalyst (20wt%Pt) was added dropwise into the mixed reaction system. After the dropwise addition, the temperature was controlled at 50° C., and the reaction was continued for 12 hours. After the reaction was finished, 105.5 g of polysiloxane functionalized with allyl glycidyl ether was obtained by distillation under reduced pressure, with a yield of 97.2%. through 1 ...

Embodiment 2

[0132] Embodiment 2 temperature-sensitive polymer material based on hydrogen bond

[0133] Step 1: In a dry four-necked flask equipped with a thermometer, a condenser, a dropping funnel, and an Ar inlet, add 150 g of anhydrous toluene, start stirring, and add 72 g of methyl methacrylate (0.72 mol) to the toluene, Then 75g hydrogen content is 0.8wt% (Mn~4000, wherein, R 1 -R6 is a methyl group, m / n is 1 / 1, m is a value in the range of 30 to 40, n is a value in the range of 30 to 40, 0.6 mol per mole of Si-H) polyalkylhydrosiloxane is added To the mixed reaction system of toluene and methyl methacrylate. Then 20mg of Karstedt platinum catalyst (20wt%Pt) was added dropwise into the mixed reaction system. After the dropwise addition, the temperature was controlled at 50° C., and the reaction was continued for 12 hours. After the reaction was finished, 131.5 g of polysiloxane functionalized with methyl methacrylate was obtained by distillation under reduced pressure, with a yiel...

Embodiment 3

[0142] Embodiment 3 temperature-sensitive polymer material based on hydrogen bond

[0143] Step 1: In a dry four-neck flask equipped with a thermometer, a condenser, a dropping funnel, and an Ar inlet, the 131.5 g of methyl methacrylate functionalized polysiloxane obtained in step 1 in Example 2 were respectively Alkanes were dissolved in 150mL tetrahydrofuran, and 36g lithium aluminum hydride was added to the system. Turn on the magnetic stirring, and control the reaction temperature at 25° C., and continue the reaction for 12 hours. After the reaction, the organic phase was collected by filtration, and then the solvent was removed by distillation under reduced pressure to obtain 112.3 g of the final product hydroxyl-functionalized polysiloxane with a yield of 93.8%. The reaction formula is as follows:

[0144]

[0145] The mechanism of hydrogen bonding in the above hydroxyl-functionalized polysiloxane structure under temperature change is as follows:

[0146]

[014...

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Abstract

The invention discloses modified polysiloxane shown as a structural formula in the description. In the formula, m is an integer from 0 to 10000; n is an integer from 0 to 10000; the m and n are not 0at the same time; R1 to R7 are the same or different; and at least one of R1 to R7 has a group having a reversible chemical bond system based on a hydrogen bond, a coordinate bond or a covalent bond.A reversible chemical bond having temperature sensitivity is creatively introduced through a chemical method to polysiloxane adopted as a main chain to obtain a polymer material which is highly sensitive to temperature. Functional materials with specific applications, such as medical external fixation materials, orthopedic materials, packaging materials, etc., can be prepared by certain processingand preparation methods by utilizing the temperature-sensitive properties of the material.

Description

technical field [0001] The invention belongs to the field of polymer materials, and in particular relates to a modified polysiloxane and its application. Background technique [0002] Temperature-sensitive materials refer to a class of materials that have reversible response characteristics to the external environment temperature (energy), and are a very important class of smart materials. Because their properties are significantly affected by temperature, they have broad application prospects. At present, temperature-sensitive polymer materials are mainly based on the principle that the degree of movement of polymer chains changes with temperature. At low temperature, the entanglement between polymer chain segments is serious, and the movement is hindered, thus showing stronger and tougher properties; Softer in nature. However, since the entanglement between such polymer chain segments is less dependent on temperature, a wider temperature range is required to make the mat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G77/388C08G77/398
CPCC08G77/388C08G77/398C08G77/38C08F283/12C08G77/385C08G77/392C08G77/395C08J3/24C08J3/246
Inventor 李承辉赖建诚左景林
Owner NANJING UNIV
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