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Dynamic polymer with hybrid cross-linked structure and application thereof

A hybrid cross-linking and polymer technology, applied in the field of smart polymers, can solve the problems of dynamic reversible effect, limited control ability, inability to combine structure and dynamic, and achieve the effect of broad application prospects.

Inactive Publication Date: 2018-07-31
翁秋梅
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the commonly used cross-linked polymers are often composed of a single ordinary covalent bond or a single dynamic covalent bond, and it is still impossible to organically combine the structural and dynamic properties in the polymer. The dynamic reversible effect and regulation ability are also very limited, so it is necessary to develop a new type of polymer to solve the problems in the existing technology

Method used

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  • Dynamic polymer with hybrid cross-linked structure and application thereof
  • Dynamic polymer with hybrid cross-linked structure and application thereof
  • Dynamic polymer with hybrid cross-linked structure and application thereof

Examples

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preparation example Construction

[0077] In the preparation process of dynamic polymer foaming materials, three methods of mechanical foaming, physical foaming and chemical foaming are mainly used to foam dynamic polymers.

[0078] 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 gel and solidify to become a foam material. In order to shorten the molding cycle, air can be introduced and emulsifiers or surfactants can be added.

[0079] Wherein, the physical foaming method is to utilize physical principles to realize the foaming of the polymer in the preparation process of the dynamic polymer, and it generally includes the following five methods: (1) inert gas foaming method, that is, after adding Press the inert gas into the molten polymer or pasty mate...

Embodiment 1

[0145] Mix hydroxyl-terminated polybutadiene (HTPB) and toluene diisocyanate (2,4-TDI) thoroughly, then add a small amount of glycerol as a crosslinking agent, and control the NCO:OH in the reaction to be about 1.2:1, that is, 2, Slightly excess 4-TDI, covalently cross-linked to obtain a side group containing double bond polyurethane (molecular weight about 18000).

[0146] 12.8g of polyurethane (molecular weight about 18000) containing double bonds in the above-mentioned side group, 1.5g of 6-mercaptopropyltrimethoxysilane and 0.7g of 1,12-dimercaptododecane according to the compound of double bond and two mercapto groups Mixed at a molar ratio of 22:20:1, added 0.2wt% photoinitiator benzoin dimethyl ether (DMPA), stirred well, put it in a UV crosslinking apparatus for 4 hours of ultraviolet radiation, and prepared a compound containing ordinary covalent crosslinking of polyurethane.

[0147] Fully mix 35.1g of the above-mentioned polyurethane containing ordinary covalent cr...

Embodiment 2

[0150] First, mix a certain amount of trimethylolpropane tris(2-mercaptoacetate) and 1,6-hexadiene according to the molar ratio of mercapto and double bonds at 2:1, and put them in the ultraviolet crosslinking apparatus for ultraviolet radiation After 2 h, a polymer containing mild general covalent crosslinking and a certain amount of residual trimethylolpropane tris(2-mercaptoacetate) was obtained as a prepolymer.

[0151] Mix trimethyl borate and dimethylmethoxy-3-butene silane in a molar ratio of 1:3, heat to 60°C and stir to dissolve, then add a small amount of water to continue the reaction for 4 hours to obtain a silicon borate containing bonded trivinyl compound 2a.

[0152]

[0153] Silanol-terminated organopolysiloxanes (molecular weight approx. 2500) with pendant olefinic groups and 2,6-di-tert-butyl-4-tolyldibutyl orthoborate according to Terminated Siloxane Mix with borate at a molar ratio of 1:1, heat up to 80°C and mix evenly, add 6ml of deionized water, and ...

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Abstract

The invention discloses a dynamic polymer with a hybrid cross-linked structure. The dynamic polymer contains at least one common covalently cross-linked network with a carbon chain or carbon heterochain as a skeleton, and further contains dynamic covalent inorganic silicon borate bonds. Common covalent cross-linking endows the polymer with certain strength and stability. The existence of the inorganic silicon borate bonds allows the polymer to have good dynamic reversibility, present functional characteristics like stimulation responsiveness, exert good energy-absorbing effect and realize toughening and damping of materials in specific structures. The dynamic polymer can be used for preparing damping and buffering materials, anti-impact protection materials, self-repairing materials, toughmaterials, force transducers, etc.

Description

technical field [0001] The invention relates to the field of intelligent polymers, in particular to a dynamic polymer with a hybrid cross-linked network composed of ordinary covalent bonds and inorganic borate silicon ester bonds and an application thereof. Background technique [0002] Traditional polymers are generally composed of ordinary covalent bonds, which endow polymers with good stability and stress bearing capacity due to their high bond energy. The dynamic covalent bond is a kind of chemical bond that can undergo reversible reactions under certain conditions. It is more stable than non-covalent bonds, but the bond energy is weaker than ordinary covalent bonds. Dynamic covalent bonds can be realized by controlling external conditions. fracture and formation. Introducing dynamic covalent bonds into polymers is a feasible approach to form new types of smart polymers. The significance of introducing dynamic covalent bonds in polymers is that, on the basis of ordinar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L75/14C08L83/06C08K3/04C08K5/55C08J3/24C08G18/69C08G18/32C08G75/045C08J3/28C08K3/36C08K3/22C08F255/02C08F230/08C08L51/06C08L83/04C08L71/02C08L69/00
CPCC08F255/02C08G18/3206C08G18/69C08G75/045C08J3/24C08J3/246C08J3/28C08K5/55C08L51/06C08L69/00C08L75/14C08L83/04C08J2483/06C08K2201/011C08J2375/14C08F230/085C08L83/06C08K3/04C08L71/02C08K3/34C08G18/32C08G77/56C08K3/22C08K3/36C08L33/26
Inventor 不公告发明人
Owner 翁秋梅
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