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Hybrid crosslinked dynamic polymer

A hybrid cross-linking, polymer technology, applied in the field of smart polymers, can solve problems such as poor mechanical properties, no covalent cross-linked network, and limited application range of dynamic polymers.

Pending Publication Date: 2019-01-15
厦门天策材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, many reports only use supramolecular interaction to prepare dynamic polymers alone. Without the support of covalent crosslinking network, the prepared dynamic polymers generally have poor mechanical properties, which greatly limits the application of dynamic polymers. scope

Method used

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preparation example Construction

[0191] In the preparation process of dynamic polymer, three methods of mechanical foaming method, physical foaming method and chemical foaming method are mainly used to foam dynamic polymer.

[0192] Among them, the mechanical foaming method is to introduce a large amount of air or other gases into the emulsion, suspension or solution of the polymer with the help of strong stirring during the preparation of the dynamic polymer to make it a uniform foam, and then through physical Or chemical changes make it shape and become a foam material. In order to shorten the molding cycle, air can be introduced and emulsifiers or surfactants can be added.

[0193] Wherein, the physical foaming method is to use physical principles to realize the foaming of the polymer during the preparation of the dynamic polymer, which includes but not limited to the following methods: (1) inert gas foaming method, that is, after adding Press the inert gas into the molten polymer or pasty material under ...

Embodiment 1

[0254] Add 100 parts by mass of toluene, 36 parts by mass of acrylamide, 7.2 parts by mass of 1H,1H,2H-heptafluoropentane-1-ene, 0.1 parts by mass of azobisisobutyronitrile, 0.01 parts by mass of four Methylethylenediamine (TEMED), stir and mix evenly, heat up to 80°C, react for 2 hours, add 24 parts by mass of toluene diisocyanate (TDI), continue to react for 2 hours, remove the solvent, and use deionized water to wash as much as possible, and then The product was put into 100 parts by mass of deionized water and swelled at room temperature for 12 hours to obtain a dynamic polymer hydrogel. It was made into a dumbbell-shaped sample with a size of 80.0×10.0×2.0mm, and a tensile test was carried out using a tensile testing machine. The tensile rate was 50mm / min. The measured tensile strength of the sample was 1.12±0.15MPa, and the elongation at break The rate is 245.21±23.17%, and it can be made into a kind of self-adhesive drug-loaded tough gel material for use.

Embodiment 2

[0256] 1 molar equivalent of polyacrylonitrile (average molecular weight about 10000), 5 molar equivalents of 3-(azidomethyl)pyridine, 10 molar equivalents of 2,5-anhydro-1-azido-1-deoxy-D-glucitol, 3 molar equivalents of methyl azidoacetate, 100 molar equivalents of zinc chloride, a small amount of fumed silicon dioxide and nano-scale iron ferric oxide were dissolved in dimethylformamide, ultrasonicated at room temperature for 5 minutes to fully mix the components and then heated to Stirring and reacting at 125°C to obtain modified polyacrylonitrile product 1; reacting modified polyacrylonitrile product 1 and 1,6-hexamethylene diisocyanate with 0.5 times the molar equivalent of the sum of hydroxyl groups contained in dimethyl sulfoxide to obtain Cross-linked modified polyacrylonitrile product 2; add a DMSO solution containing iron trifluoromethanesulfonate to an appropriate amount of modified polyacrylonitrile product 2, stir evenly and let stand to swell for 12 hours to obtai...

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Abstract

The invention discloses a hybrid crosslinked dynamic polymer, which contains supramolecular interaction and covalent bond formed covalent crosslinking. Specifically, covalent crosslinking reaches thegel point of covalent crosslinking or above in at least one crosslinked network, and the supramolecular interaction is at least selected from metallophilic action, halogen bond action, cation-pi action, anion-pi action, benzene-fluorobenzene interaction, ionic hydrogen bond action, and free radical cationic dimerization. Based on the properties of supramolecular interaction and the strength and stability of the polymer endowed by covalent crosslinking, the dynamic polymer can be widely applied as a self-repair material, toughness material, sealing material, adhesive, force sensor material andthe like.

Description

Technical field: [0001] The invention relates to the field of intelligent polymers, in particular to a hybrid cross-linked dynamic polymer composed of covalent bonds and supramolecular interactions. Background technique: [0002] The hybrid cross-linked network structure (such as the interpenetrating network structure) is a structure that can effectively improve the performance of polymers. In the covalent interpenetrating network structure, in order to obtain sufficient toughness, it is often necessary to carry out a large-scale modification of the first network. Swelling (for example with a solvent or a second network) to obtain irreversible toughness at the expense of the first network (irreversible breaking of covalent bonds) during use. The dynamic polymers of this kind of covalent hybrid cross-linked network not only cannot perform any repair after damage, but also lack dynamicity and cannot be effectively reused, which greatly limits their performance and applications...

Claims

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Application Information

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IPC IPC(8): C08G18/62C08G18/48C08J9/14C08K3/04C08K7/20C08L83/05C08L83/07C08L71/00C08K13/04C08K7/14C08K3/34C08L75/08C08L75/04C08K7/24
CPCC08G18/6212C08G18/6225C08G18/6262C08G18/6266C08G18/6283C08J9/146C08J2375/04C08K2201/011C08L71/00C08L75/08C08L83/04C08L2201/04C08L2203/14C08L2203/20C08L2205/02C08L2205/025C08L2205/035C08K13/04C08K7/14C08K3/04C08K3/34C08L75/04C08K7/24
Inventor 不公告发明人
Owner 厦门天策材料科技有限公司
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