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PDMS (polydimethylsiloxane) material containing benzimidazolyl dynamic covalent bonds as well as preparation method and application of PDMS material

A dynamic covalent bond and benzimidazole-based technology, which is applied in additive processing, prosthesis, medical science, etc., achieves the effects of lower processing temperature, wide application range, and improved dynamic adaptability

Pending Publication Date: 2022-03-18
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

To a certain extent, avoid environmental pollution, energy waste and other problems caused by traditional incineration, landfill and other cross-linked polymer recycling methods

Method used

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  • PDMS (polydimethylsiloxane) material containing benzimidazolyl dynamic covalent bonds as well as preparation method and application of PDMS material
  • PDMS (polydimethylsiloxane) material containing benzimidazolyl dynamic covalent bonds as well as preparation method and application of PDMS material
  • PDMS (polydimethylsiloxane) material containing benzimidazolyl dynamic covalent bonds as well as preparation method and application of PDMS material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Dissolve 7.50g of modified amodimethicone DMS-A211, 0.99g of hexamethylene diisocyanate, 0.40g of 2-hydroxybenzimidazole and 2.03g of hexamethylene diisocyanate trimer in 40ml In tetrahydrofuran, stir and react at room temperature for 12 hours. After the reaction, pour the prepolymer into a polytetrafluoroethylene mold, remove the solvent at room temperature for 24 hours, remove the solvent at 50°C for 12 hours, and remove the solvent at 80°C for 12 hours. Take out and obtain the silicone rubber solid containing benzimidazolium urea bond, such as figure 1 Shown in a.

Embodiment 2

[0032] Reprocessing performance of PDMS elastomers containing benzimidazole-based dynamic covalent bonds is demonstrated.

[0033] The bulk polymer prepared in Example 1 is frozen and pulverized under liquid nitrogen conditions to obtain a polymer powder that can be used for laser sintering 3D printing (SLS), such as figure 1 Shown in b.

[0034] The bulk polymer prepared in Example 1 was melt-extruded by an extruder at 120° C. to obtain polymer strands, such as figure 1 As shown in c.

[0035] The bulk polymer prepared in Example 1 was hot-pressed at 120° C. and 10 MPa pressure for 30 minutes using a hot press to obtain a polymer sheet, such as figure 1 Shown in d.

Embodiment 3

[0037] Tensile properties of PDMS elastomers containing benzimidazole-based dynamic covalent bonds. Several polymer materials with different proportions were prepared according to the method described in Example 1 and processed into polymer sheets according to the method described in Example 2. In the test, the obtained polymer sheet was cut into a dumbbell-shaped sample for testing, with a size of about 15 mm in length, 2 mm in width, and 0.8-1.5 mm in thickness. The testing machine uses a 1kN sensor at 50mm min -1 The tensile rate was uniaxially stretching the sample at 20°C, and the stress-strain curve was recorded, and 5 samples were tested in parallel for each group.

[0038] Such as figure 2 As shown, this type of material has good mechanical property adjustability (the adjustable range of elongation at break is 20%-1000%, and the adjustable range of strength is 0.01MPa-8.00MPa). Such materials can meet the mechanical performance requirements of practical application...

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Abstract

The invention provides a PDMS (polydimethylsiloxane) material containing benzimidazolyl dynamic covalent bonds as well as a preparation method and application thereof. The PDMS material is prepared from the following raw materials: amino or hydroxyl-terminated polydimethylsiloxane, diisocyanate, a functionalized benzimidazole compound, a cross-linking agent and a solvent. The raw materials are dissolved in a solvent to obtain a reaction solution, and the reaction solution is stirred at room temperature for reaction to obtain a prepolymer; and pouring the polymer into a mold, putting into a drying oven, removing the solvent and curing. The prepared material has self-repairing and reprocessing properties, and can be applied to the fields of 3D printing, tissue engineering, artificial skin and the like. According to the invention, the functionalized benzimidazole compound reacts with isocyanate, and the reaction is rapid at room temperature and has a large equilibrium constant. A benzimidazole chain extender is introduced in the condensation polymerization process, and a benzimidazolyl dynamic covalent bond is introduced into PDMS, so that the dynamic adaptability of a polymer network is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of new materials, and relates to a PDMS material containing a benzimidazole group dynamic covalent bond, a preparation method and an application. Background technique [0002] The main chain of polydimethylsiloxane (PDMS) is mainly composed of Si-O bonds with methyl side groups. Since the silicon element in the main chain is SP2 hybridized, the PDMS main chain is in a helical conformation, and the polymer main chain is wrapped by a methyl group with an increased steric hindrance effect. This structure endows PDMS with lower surface energy, which makes the PDMS chain segments more prone to thermal movement at room temperature. Therefore, linear PDMS materials generally have low mechanical strength, and currently widely used PDMS materials are mostly cross-linked polymers. Cross-linked polymers are bound to face scratches and scratches in practical applications. Mechanical damage such as abrasion. At the s...

Claims

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Application Information

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IPC IPC(8): C08G18/12C08G18/65C08G18/61C08G18/32A61L27/18A61L27/60B33Y70/00
CPCC08G18/12C08G18/61C08G18/3293C08G18/6535A61L27/18A61L27/60B33Y70/00C08L75/04
Inventor 夏和生解淼王占华赖佳亮赵启凡
Owner SICHUAN UNIV
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