Self-repairing polysiloxane elastomer and preparation method thereof

Abstract

The invention discloses a self-repairing polysiloxane elastomer. The polysiloxane elastomer is prepared by taking aminopropyl double-terminated polydimethylsiloxane (NH2-PDMS (Polydimethylsiloxane)-NH2), diisocyanate and citryl chloride converted from citric acid as raw materials, and carrying out a reaction. According to the invention, two different diisocyanate and aminopropyl double-terminated polydimethylsiloxane are subjected to a reaction at room temperature, and an isocyanate group and an amino group generate carbamate. Hydrogen bonds are formed among the carbamates to generate physical crosslinking. And then controlling reaction conditions to enable two acyl chloride groups of the prepared citryl chloride to react with amino to generate amido bonds. The generation of amido bonds and the action of hydrogen bonds enable the elastomer to have fluorescence characteristics under a specific wavelength. The method is suitable for the field of high-molecular intelligent materials.

Description

technical field

[0001] The invention belongs to the field of polymer intelligent materials, and in particular relates to a self-repairing polysiloxane elastomer and a preparation method thereof. Background technique

[0002] Polysiloxane (Polysiloxane) refers to a class of polymers whose main chain is mainly composed of Si-O units and monovalent organic groups are side groups. The main chain of the siloxane molecule contains a special structure of silicon oxide (Si-O) chain links, which endows it with excellent properties of high and low temperature resistance, aging resistance, hydrophobicity and electrical insulation. Si-O bonds have larger bond angles and larger bond lengths, and are more prone to internal rotation, so the polymer is flexible and highly designable. Based on the above advantages, polysiloxane is widely used in aviation, automobiles, flexible electronic devices, electrical and other fields, and also has many applications in medical care and daily life. Ho...

Examples

Embodiment 1

[0035] A method for preparing a self-healing polysiloxane elastomer with fluorescent properties, comprising the following preparation steps:

[0036] S1: Preparation of citric acid chloride: Dissolve 1 g of citric acid in 15 ml of tetrahydrofuran, stir and add 1.3 ml of thionyl chloride at 0°C, and react for 12 hours; Thionyl chloride, repeated 3 times to obtain light yellow transparent viscous citric acid chloride, add 10ml tetrahydrofuran and put it in the refrigerator for later use;

[0037] S2: Preparation of PDMS prepolymer: Dissolve 3g of aminopropyl-terminated polysiloxane in an appropriate amount of tetrahydrofuran, then add 0.1g of hexamethylene diisocyanate to it, mix well, and stir mechanically at room temperature for 24h at 25°C to obtain PDMS prepolymer;

[0038] S3: Preparation of polysiloxane elastomer (CA-PDMS): add 1.15ml of tetrahydrofuran solution of citric acid chloride prepared in step S2 to PDMS prepolymer, heat and reflux at 80°C in oil bath for 6h; pou...

technical field

[0001] The invention belongs to the field of polymer intelligent materials, and in particular relates to a self-repairing polysiloxane elastomer and a preparation method thereof. Background technique

[0002] Polysiloxane (Polysiloxane) refers to a class of polymers whose main chain is mainly composed of Si-O units and monovalent organic groups are side groups. The main chain of the siloxane molecule contains a special structure of silicon oxide (Si-O) chain links, which endows it with excellent properties of high and low temperature resistance, aging resistance, hydrophobicity and electrical insulation. Si-O bonds have larger bond angles and larger bond lengths, and are more prone to internal rotation, so the polymer is flexible and highly designable. Based on the above advantages, polysiloxane is widely used in aviation, automobiles, flexible electronic devices, electrical and other fields, and also has many applications in medical care and daily life. Ho...

Examples

Embodiment 1

[0035] A method for preparing a self-healing polysiloxane elastomer with fluorescent properties, comprising the following preparation steps:

[0036] S1: Preparation of citric acid chloride: Dissolve 1 g of citric acid in 15 ml of tetrahydrofuran, stir and add 1.3 ml of thionyl chloride at 0°C, and react for 12 hours; Thionyl chloride, repeated 3 times to obtain light yellow transparent viscous citric acid chloride, add 10ml tetrahydrofuran and put it in the refrigerator for later use;

[0037] S2: Preparation of PDMS prepolymer: Dissolve 3g of aminopropyl-terminated polysiloxane in an appropriate amount of tetrahydrofuran, then add 0.1g of hexamethylene diisocyanate to it, mix well, and stir mechanically at room temperature for 24h at 25°C to obtain PDMS prepolymer;

[0038] S3: Preparation of polysiloxane elastomer (CA-PDMS): add 1.15ml of tetrahydrofuran solution of citric acid chloride prepared in step S2 to PDMS prepolymer, heat and reflux at 80°C in oil bath for 6h; pou...

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