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Polysiloxane-carbamate elastomer containing Diels-Alder bond and preparation method of polysiloxane-carbamate elastomer

A technology of urethane and polysiloxane, applied in the field of materials, can solve the problem of poor mechanical properties of reversible covalently cross-linked polysiloxane, high reprocessing temperature, mechanical properties and self-healing properties cannot be improved at the same time, etc. problems, to achieve excellent water resistance and air permeability, good biocompatibility, and high yield

Inactive Publication Date: 2016-09-21
SICHUAN UNIV
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the poor mechanical properties and high reprocessing temperature of existing reversible covalently crosslinked polysiloxane elastomers containing hydrogen bonds or borate bonds, and the mechanical properties and self-healing properties of Diels-Alder bond crosslinked polysiloxane elastomers The problem that performance cannot be improved at the same time, combined with the characteristics of strong designability of polyurethane molecules, the present invention provides a polysiloxane-urethane elastomer based on furan-maleimide and its preparation method

Method used

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  • Polysiloxane-carbamate elastomer containing Diels-Alder bond and preparation method of polysiloxane-carbamate elastomer
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  • Polysiloxane-carbamate elastomer containing Diels-Alder bond and preparation method of polysiloxane-carbamate elastomer

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Embodiment 1

[0044] Synthesis of isocyanate-terminated polydimethylsiloxane: 10 g aminopropyl-terminated polydimethylsiloxane DMS-A12 (10 mmol), 4.5 g triethylamine (45 mmol) and 4.45 g triphosgene (15 mmol ) was dissolved in 300mL benzene, stirred and reacted at room temperature under nitrogen protection for 6 hours. After the reaction was completed, a brown liquid was obtained by filtration, and the solvent was removed by rotary evaporation at 60° C. to obtain ~9.9 g of a brown sticky substance. Its infrared spectrum is as figure 1 shown.

Embodiment 2

[0046] Synthesis of isocyanate-terminated polyε-caprolactone: Weigh polyε-caprolactone diol and diphenylmethane diisocyanate with the ratio of the amount of substances -OH / -NCO=2 / 1, under nitrogen protection Stir and react at 80°C for 2 hours to obtain a white solid isocyanate-capped polyε-caprolactone, which is sealed for future use.

Embodiment 3

[0048] Synthesis of diols containing Diels-Alder bonds: Dissolve furan 1 and maleic anhydride 2 in an equivalent amount in excess 1,4-dioxane, stir and react at room temperature for 24 hours, mash the obtained precipitate, After suction filtration, ether washing, and drying, the product 3 was obtained; the equivalent amount of product 3 and ethanolamine were dissolved in methanol under ice bath conditions, stirred and reacted at 75°C for 24 hours, and the reaction mixture was cooled and crystallized in a refrigerator, and then After suction filtration, ether washing, and drying, the product 4 was obtained; the product 4 was added to excess toluene, stirred and refluxed at 130°C for 12 hours, then the solution was filtered, and the filtrate was cooled and crystallized in a refrigerator. washing and drying to obtain the product 5; the equivalent amount of the product 5 and furfuryl alcohol were stirred and reacted in toluene at 80°C for 24 hours, and the obtained precipitate was ...

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Abstract

The invention relates to the field of materials, in particular to a polysiloxane-carbamate elastomer containing a Diels-Alder bond and a preparation method of the polysiloxane-carbamate elastomer. The polysiloxane-carbamate elastomer is prepared from a cross-linking agent, isocyanato-terminated polydimethylsiloxane, isocyanato-terminated polyester or polyether, diol containing the Diels-Alder bond as well as a catalyst dibutyltin dilaurate through curing after a reaction in anhydrous 1,4-dioxane under the protection of nitrogen. The elastomer has a microphase separation structure, multiple plastic micro-areas are formed in the elastomer, and on one hand, the micro-areas are taken as physical crossing points to improve tensile strength; on the other hand, the plastic micro-areas generate plastic deformation in a stretching process to increase elongation at break. The method adopts easily available raw materials, a synthesis process requires no special conditions or equipment, a synthesis technology is simple and easy to control, and the yield is high.

Description

technical field [0001] The invention relates to the field of materials, in particular to a polysiloxane-urethane elastomer containing a Diels-Alder bond and a preparation method thereof. Background technique [0002] Polysiloxane is a kind of semi-inorganic and semi-organic structural macromolecular compound with repeated Si-O bonds as the main chain and organic groups directly connected to silicon atoms. It has both the characteristics of inorganic and organic polymers, such as High and low temperature resistance, weather aging resistance, electrical insulation, ozone resistance, hydrophobic, good gas permeability and non-toxic, biologically inert, etc. It is widely used in electrical and electronic, construction, automobile, textile, medical and other fields. Polysiloxane molecular chains are flexible and have low intermolecular forces, so they are usually used in the form of cross-linked elastomers. Traditional polysiloxane elastomers face the same problems as all thermo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/38C08G18/70C08G18/79C08G63/91C08G77/38C07D491/08
CPCC07D491/08C08G18/3846C08G18/708C08G18/792C08G63/912C08G77/38
Inventor 夏和生赵健虎晓东
Owner SICHUAN UNIV
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