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Thermal self-repairing PNIMMO-based thermoplastic elastomer and preparation method thereof

A thermoplastic elastomer and self-repairing technology, which is applied in the direction of offensive equipment, non-explosive/non-thermal agent components, explosives, etc., can solve the problems of non-energy and cannot meet the application requirements of explosives, and achieve high energy characteristics.

Active Publication Date: 2020-11-10
XIAN MODERN CHEM RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the elastomer itself does not contain energy and cannot meet the application requirements of propellants and explosives, and needs further improvement

Method used

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  • Thermal self-repairing PNIMMO-based thermoplastic elastomer and preparation method thereof
  • Thermal self-repairing PNIMMO-based thermoplastic elastomer and preparation method thereof
  • Thermal self-repairing PNIMMO-based thermoplastic elastomer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] This embodiment provides a thermal self-healing PNIMMO-based thermoplastic elastomer, which is prepared according to the following method:

[0031] (1) In a 100mL three-necked round-bottom flask equipped with mechanical stirring, a thermometer and a reflux device, add PNIMMO (8g, 4mmol) with a molecular weight of 2000Da, 12mL of anhydrous tetrahydrofuran, furoyl chloride (1.15g, 8.81mmol) and Fu The acid agent triethylamine (0.81g, 8mmol) forms a mixed solution. Under the protection of a nitrogen atmosphere, the mixed solution is stirred and reacted at room temperature for 30h; Modified PNIMMO;

[0032] (2) 6g of the furan-terminated PNIMMO synthesized above was added to a 100mL three-necked round-bottomed flask equipped with mechanical stirring, a thermometer and a reflux device containing 10mL of dichloroethane solvent, and stirred and mixed uniformly to form a mixed solution; Under the protection of the atmosphere, add 4,4'-bismaleimido diphenylmethane chain extende...

Embodiment 2

[0037] This embodiment provides a thermal self-healing PNIMMO-based thermoplastic elastomer, which is prepared according to the following method:

[0038] (1) In a 100mL three-necked round-bottom flask equipped with mechanical stirring, a thermometer and a reflux device, sequentially add PNIMMO (16g, 4mmol) with a molecular weight of 4000Da, 18mL of anhydrous tetrahydrofuran, furoyl chloride (1.25g, 9.58mmol) and Fu The acid agent triethylamine (0.89g, 8.79mmol) forms a mixed solution. Under the protection of a nitrogen atmosphere, the mixed solution is stirred and reacted at room temperature for 24 hours; Furan-modified PNIMMO;

[0039] (2) 12g of the furan-terminated PNIMMO synthesized above was added to a 100mL three-neck round-bottomed bottle equipped with mechanical stirring, a thermometer and a reflux device containing 16mL of dichloroethane solvent, stirred and mixed to form a mixed solution; Under the protection of the atmosphere, add 4,4'-bismaleimido diphenylmethane...

Embodiment 3

[0041] This embodiment provides a thermal self-healing PNIMMO-based thermoplastic elastomer, which is prepared according to the following method:

[0042] (1) In a 100mL three-neck round-bottom flask equipped with mechanical stirring, a thermometer and a reflux device, add PNIMMO (24g, 4mmol) with a molecular weight of 6000Da, 26mL of anhydrous tetrahydrofuran, furoyl chloride (1.46g, 11.2mmol) and Fu The acid agent triethylamine (0.97g, 9.58mmol) forms a mixed solution. Under the protection of nitrogen atmosphere, the mixed solution is stirred and reacted at room temperature for 20h; after the reaction time is up, the reaction solution is concentrated, washed, and vacuum-dried at 40°C to obtain terminal Furan-modified PNIMMO;

[0043] (2) 18g of the furan-terminated PNIMMO synthesized above was added to a 100mL three-necked round-bottomed bottle equipped with mechanical stirring, a thermometer and a reflux device containing 28mL of dichloroethane solvent, stirred and mixed un...

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Abstract

The invention discloses a thermal self-repairing PNIMMO-based thermoplastic elastomer and a preparation method thereof, aiming at solving the problem that a traditional polyurethane elastomer is difficult to repair after being damaged. The molecular structural formula of the thermal self-repairing PNIMMO-based thermoplastic elastomer is shown in the specification, in the formula, n is an integer ranging from 7 to 60, and x is an integer ranging from 5 to 100. The preparation method comprises the following steps: firstly, with PNIMMO and furoyl chloride as raw materials, preparing furyl-terminated modified PNIMMO through an elimination reaction; and then preparing the thermal self-repairing PNIMMO-based thermoplastic elastomer through Diels-Alder reaction by taking furyl-terminated modifiedPNIMMO as a prepolymer and 4,4'-bismaleimide diphenylmethane as a chain extender. The thermal self-repairing PNIMMO-based thermoplastic elastomer disclosed by the invention is simple and feasible insynthetic route, has a self-repairing function and has a wide application value in the field of polymer bonded (PBX) explosives.

Description

technical field [0001] The invention relates to a thermal self-healing PNIMMO-based thermoplastic elastomer, which is suitable for the field of solid propellants. Background technique [0002] Nitrate energetic binders are widely used in the development of propellant and explosive products due to their high energy properties, high oxygen content, and good compatibility with nitrate plasticizers. Nitrate-based energetic binders mainly include polyglycidyl ether nitrate (PGN), poly-3-nitrate methyl-3-methyloxetane (PNIMMO) and the like. However, studies have found that PGN-based polyurethanes are easy to degrade and age, and will crack on their own after being placed at room temperature for 1 to 2 years, which is difficult to meet the application requirements. PNIMMO polymer has high energy properties, good thermal stability and excellent sensitivity properties, and has become one of the most promising new energetic adhesives. [0003] In recent years, Diels-Alder bond as a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G65/333C08G65/332C06B25/34C06B23/00
CPCC08G65/33341C08G65/3328C06B25/34C06B23/001
Inventor 徐明辉莫洪昌卢先明张倩刘宁陈淼段秉蕙葛忠学
Owner XIAN MODERN CHEM RES INST
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