Reversible covalent crosslinking polysiloxane elastomer, preparation method therefor and application thereof

A polysiloxane and covalent cross-linking technology is applied in the field of reversible covalent cross-linking polysiloxane and its preparation, which can solve the problems of poor mechanical properties and high reprocessing temperature, and achieves low cost, excellent mechanical properties, high yield effect

Active Publication Date: 2015-12-02
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, to explore a polysiloxane elastomer with reversible Diels-Alder bond crosslinking, to solve the poor mechanical properties of existing reversible cova

Method used

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  • Reversible covalent crosslinking polysiloxane elastomer, preparation method therefor and application thereof
  • Reversible covalent crosslinking polysiloxane elastomer, preparation method therefor and application thereof
  • Reversible covalent crosslinking polysiloxane elastomer, preparation method therefor and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1: Preparation of Reversible Covalently Crosslinked Polysiloxane Elastomer

[0030] (1) Synthesis of polysiloxane with dienophiles in side groups: aminopropylmethylsiloxane-dimethylsiloxane copolymer (brand: AMS-191, aminopropylmethylsiloxane content 9~11%, average molecular weight 3000) 10g, maleic anhydride 6.52g and 100ml glacial acetic acid add in the 250ml single-necked flask that has condenser tube, heat to 140 ℃ of stirring reaction in oil bath pan for 12 hours. After the reaction is completed, rotate at a temperature of 60°C and a vacuum of 0.08 to 0.1 MPa to remove glacial acetic acid to obtain a light brown viscous liquid, then dissolve the light brown viscous liquid in 100ml of dichloromethane and wash with deionized water Three times, the organic layer was collected, dried over anhydrous magnesium sulfate, and the dichloromethane was removed by rotary evaporation to obtain the polysiloxane with maleimide in the side group. figure 1 It can be seen th...

Embodiment 2

[0033] Example 2: Reprocessability of Polysiloxane Elastomers with Reversible Covalent Crosslinks

[0034] Cut the prepared polysiloxane elastomer rectangular splines containing reversible covalent crosslinking points into small pieces, and then cut them into small pieces for molding. Place at ℃ for 24h, such as image 3 shown.

[0035] Depend on image 3 It can be seen that without any external repair agent or catalyst, a complete sheet with a smooth surface can be obtained under mild conditions, with good elasticity and self-repair. Example 3: Self-healing properties of polysiloxane elastomers with reversible covalent crosslinks

Embodiment 3

[0035] Depend on image 3 It can be seen that without any external repair agent or catalyst, a complete sheet with a smooth surface can be obtained under mild conditions, with good elasticity and self-repair. Example 3: Self-healing properties of polysiloxane elastomers with reversible covalent crosslinks

[0036] Cut off the prepared rectangular polysiloxane elastomer strips containing reversible covalent crosslinking points with a blade, then quickly fit the two ends together and place them in an oven at 140°C for 3 hours, and then place them in an oven at 80°C for 3 hours, as Figure 4 shown.

[0037] Depend on Figure 4 It can be seen that when the prepared cross-linked polysiloxane elastomer is heated to 120-140 °C, the reversible covalent cross-linking points will break, and when the temperature drops to 60-100 °C, the reversible covalent cross-linking points can be re-established. Formed to realize the reversibility of the cross-linked network structure of the materi...

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Abstract

The invention discloses a reversible covalent crosslinking polysiloxane elastomer, a preparation method therefor and an application thereof. The reversible covalent crosslinking polysiloxane elastomer has the following structure: FORMULA as shown in the specification. The present invention further discloses a preparation method and an application for the reversible covalent crosslinking polysiloxane elastomer. The polysiloxane elastomer provided by the present invention has advantages of relatively low temperature of reprocessing, good reprocessing performance and high self-repairing efficiency. The reversible covalent crosslinking polysiloxane elastomer is simple in preparation process and relatively low in cost.

Description

technical field [0001] The invention relates to a preparation method and application of a polysiloxane elastomer, in particular to a reversible covalently crosslinked polysiloxane and a preparation method and application thereof. Background technique [0002] Polysiloxane is a kind of polymer with repeated Si-O bonds as the main chain and organic groups directly connected to silicon atoms. According to the molecular weight or whether it is cross-linked, it can be divided into three categories: silicone oil, silicone rubber and silicone resin. Among them, silicone rubber is one of the most important products in polysiloxane. Before crosslinking, it is linear polysiloxane, and after crosslinking, it is a network structure elastomer. Silicone rubber has excellent high and low temperature resistance, weather resistance, ozone resistance, arc resistance, electrical insulation, resistance to certain chemical reagents, high air permeability and physiological inertia, etc., and is ...

Claims

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Application Information

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IPC IPC(8): C08J3/24C08L83/08C08G77/38C08G77/388
Inventor 夏和生赵健罗高兴李志超徐瑞
Owner SICHUAN UNIV
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