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Hybrid dynamic polymer composition

A technology of polymer and composition, applied in the field of hybrid dynamic polymer composition, can solve the problem that the characteristics of dynamic reversible covalent bond are difficult to fully reflect, and achieve the effect of excellent self-healing property and unique low temperature performance

Active Publication Date: 2019-04-23
厦门逍扬运动科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existence of situations such as this makes it difficult for the characteristics of the dynamic reversible covalent bond itself to be fully reflected under normal conditions, and it is necessary to develop a new type of dynamic polymer to solve the above-mentioned problems in the prior art

Method used

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preparation example Construction

[0180] In the preparation process of dynamic polymers, three methods of mechanical foaming, physical foaming and chemical foaming are mainly used to foam dynamic polymers.

[0181] 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.

[0182] 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 pressure, and then ...

Embodiment 1

[0236] 1,5-Divinylhexamethyldisiloxane and 3-buten-1-ol are mixed at a molar ratio of 1:1, and reacted in toluene under the action of the initiator benzamide peroxide to obtain Compound 1 whose side group contains a hydroxyl group; compound 1 and methyl isocyanate are mixed in a molar ratio of 1:0.5, and reacted in dichloromethane to obtain a compound 2 whose side group contains a carbamate group. Dissolve compound 2 in DMSO, add 0.05 molar equivalent of cellulose nanocrystals, stir and mix for 6 hours, and keep the solvent to prepare a dynamic polymer solution, which can be coated on the surface of the material, Forms a tough film after drying.

Embodiment 2

[0238]

[0239] Dichloromethylvinylsilane is hydrolyzed and condensed in dilute hydrochloric acid, and the product is neutralized to near neutrality with sodium carbonate to obtain a polysiloxane with a side group having a double bond and an average molecular weight of about 7000; take 50g of polysiloxane Siloxane is reacted with 0.3g of 6-aminothiouracil in dichloromethane through thiol-ene click reaction, and then the amino group and hydroxyl group in the product are reacted with a sufficient amount of isopropyl isocyanate, and the solvent is removed. A polysiloxane with side groups containing hydrogen bonding groups; add 0.1g of conductive graphite, 0.2mg of BHT antioxidant, and 0.5g of sodium hydroxide to the above-mentioned product, stir and mix to obtain gray-black polysiloxane rubbery material. 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 10mm / min. Th...

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Abstract

The present invention discloses a hybrid dynamic polymer composition, , which at least comprises two components A and B, wherein the component A contains a dynamic polymer, a dynamically exchangeablesiloxane bond and a side hydrogen bond group participate in the formation of the hydrogen bond action of the dynamic polymer, the dynamically exchangeable siloxane bond exists as the polymerization linking point and / or cross-linking point of the dynamic polymer, and is necessary for forming or maintaining the covalent structure of the dynamic polymer, and the component B contains a catalyst and / ora complex thereof for carrying out a siloxane equilibrium reaction. According to the present invention, through the actions of the dynamic covalent bond and the supramolecular hydrogen bond in the dynamic polymer, the polymer can have orthogonal and / or synergistic dynamic reversible effects under different conditions so as to achieve good self-repairing property and rich stimulating responsiveness; and the dynamic polymer can be widely used as a self-healing material, a toughness material, a sealing material, an adhesive and the like.

Description

technical field [0001] The invention relates to a hybrid dynamic polymer composition, in particular to a hybrid dynamic polymer composition composed of dynamically exchangeable siloxane bonds and supramolecular hydrogen bonds. Background technique [0002] Dynamic chemistry is an interdisciplinary subject developed by combining supramolecular chemistry and dynamic covalent chemistry in covalent chemistry. Traditional molecular chemistry focuses on stable covalent interactions, while dynamic chemistry focuses on relatively weak non-covalent interactions and reversible covalent bonds. Among them, supramolecular chemistry is based on non-covalent intermolecular interactions. Compared with traditional covalent bonds, these non-covalent interactions have weaker bond energy and are greatly affected by thermodynamics. The formed supramolecular structure To some extent, it is not a kinetically stable system. For dynamic covalent chemistry, it has some characteristics similar to su...

Claims

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Application Information

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IPC IPC(8): C08J3/24
CPCC08J3/24C08J3/246C08J5/18C08J2383/04C08J2383/08C08J2375/04
Inventor 不公告发明人
Owner 厦门逍扬运动科技有限公司
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