Reversible, chemically or environmentally responsive polymers, and coatings containing such polymers

A technology of polymers, chemistry, applied in the field of polymers

Active Publication Date: 2018-09-28
HRL LAB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Large material components will

Method used

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  • Reversible, chemically or environmentally responsive polymers, and coatings containing such polymers
  • Reversible, chemically or environmentally responsive polymers, and coatings containing such polymers
  • Reversible, chemically or environmentally responsive polymers, and coatings containing such polymers

Examples

Experimental program
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example

[0254] Material. Has a molecular weight of 3,400 g / mol (M n ) of poly(ethylene glycol) (PEG), 4,4'-methylenebis(cyclohexylisocyanate) (HMDI), 1,4-butanediol (BD), dibutyltin dilaurate ( DBTDL), and 2,2-bis(hydroxymethyl)propionic acid were purchased from Aldrich. Fluorolink material was purchased from Solvay Specialty Polymers. All chemicals were used without further purification.

example A

[0255] Example A: Fluoropolymer Control.

[0256] A vial was charged with Fluorolink D4000 perfluoropolyether (4 g), followed by HMDI (0.786 g) and dibutyltin dilaurate (0.02%). A small PTFE-coated stir bar was introduced and the vial was placed in a 100°C oil bath for stirring. After achieving a temperature of 100°C the reaction was vortexed vigorously, then stirring was continued for 1 hour. After this step, the resin was poured into a 3"x3"PTFE mold to flash off the solvent and the film was allowed to cure overnight at room temperature.

example B

[0257] Example B: Thermoplastic polymer without ionic species.

[0258] A hydroxyl-terminated poly(perfluoropolyether) (9.00 g, 3.73 mmol, Fluorolink 5147x) was placed in a 3-neck round bottom flask containing an argon inlet and equipped with an overhead stirrer (Teflon shaft and blades ). While stirring, 4,4'-methylenebis(cyclohexylisocyanate) (4.89 g, 18.66 mmol) was added to the solution and the flask was placed in an oil bath at 100°C. Dibutyltin dilaurate (0.02% by weight) was then added to the solution using a micropipette and polymerization was allowed to proceed.

[0259] After 1 h, the prepolymer was then allowed to cool to room temperature. The prepolymer was diluted with tetrahydrofuran (15 mL) and placed in a centrifugal mixer (FlackTek DAC 600).

[0260] In a separate vial, the chain extender 1,4-butanediol (1.35 g, 14.98 mmol) was weighed out and diluted with tetrahydrofuran (0.5 mL). The two solutions were combined in a centrifugal mixer and mixed for 15 sec...

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Abstract

We have demonstrated reversibly reducing metal-ion crosslinkages in polymer systems, by harnessing light, creating a dynamic and reversible bond. The reduction induces chemical and physical changes inthe polymer materials. Some variations provide a polymer composition comprising: a polymer matrix containing one or more ionic species; one or more photosensitizers; and one or more metal ions capable of reversibly changing from a first oxidation state to a second oxidation state when in the presence of the photosensitizers and light. Some embodiments employ urethane-based ionomers capable of changing their crosslinked state under the influence of a change in counterion valance, using light or chemical reducing agents. The invention provides films, coatings, or objects that are reversible, re-mendable, self-healing, mechanically adjustable, and/or thermoplastic/thermosetswitchable.

Description

[0001] priority data [0002] This international patent application claims priority to U.S. Provisional Patent Application No. 62 / 271,942, filed December 28, 2015, and U.S. Patent Application No. 15 / 391,749, filed December 27, 2016, each of which is hereby incorporated by reference here. technical field [0003] The present invention relates generally to polymers having reversible properties, and methods of making and using these polymers. Background technique [0004] Improvements to polymer properties have historically focused on static properties, including strength, thermal stability, toughness, and durability. Recent research has broadened to incorporate multifunctionality and dynamic properties such as recyclability, remouldability, self-healing, and shape memory into polymers that can adapt to their environment. The ability to reprocess and remould certain polymers is of great interest due to increased awareness of recycling, the high cost of materials, and the abil...

Claims

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Application Information

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IPC IPC(8): C08K5/00C08K3/00C08K3/22C08L71/00C08L33/16C08L83/04C08L67/00C09D5/04
CPCC08G65/007C09D171/02C08G65/33355C08G18/4833C08G18/5015C08G18/61C08G18/6279C08G18/755C08G18/758C08G18/0823C08G18/246C08K5/0041C08G18/76C09D175/04C08L71/02C08G18/10C08G18/3206C08G18/348C08G18/50
Inventor 安德鲁·诺瓦克亚当·格罗斯阿普里尔·罗德里格斯崔山婴
Owner HRL LAB
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