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Polymer network topology heterogeneous system based on dynamic covalent bonds and application method thereof

A technology of dynamic covalent bonding and network topology, which is applied in the field of polymer network topological heterogeneous systems, can solve problems such as difficult to realize the change and regulation of polymer-related physical properties

Inactive Publication Date: 2020-07-10
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the traditional polymer dynamic covalent network is difficult to achieve the change and regulation of polymer-related physical properties.

Method used

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  • Polymer network topology heterogeneous system based on dynamic covalent bonds and application method thereof
  • Polymer network topology heterogeneous system based on dynamic covalent bonds and application method thereof
  • Polymer network topology heterogeneous system based on dynamic covalent bonds and application method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] raw material:

[0067] a) polycaprolactone diol (PCLDA): Mw=10000, Sigma-Aldrich company; Structural formula is as follows:

[0068]

[0069] b) polypentadecanolactone diol (PPDLDA): Mw=2000, Sigma-Aldrich company;

[0070] The structural formula is as follows:

[0071]

[0072] c) Hexamethylene diisocyanate (HDI): Sigma-Aldrich company; Structural formula is as follows:

[0073]

[0074] d) Dibutyltin dilaurate (DBTDL): TCI Company;

[0075] e) 1,5,7-Triazabicyclo[4.4.0]dec-5-ene: TCI Company;

[0076] f) Dichloroethane: Aladdin Reagent (Shanghai) Co., Ltd.;

[0077] Preparation:

[0078] Weigh 0.1mmol of polypentadecanolactone diacrylate, 0.9mmol of polycaprolactone diacrylate and 1mmol of hexamethylene diisocyanate in 10mL of dichloroethane (wherein PCL-diol and PPDL-diol The molar ratio of the total number of hydroxyl groups to the isocyanate group is 1:1), heated to 80C to dissolve. Then add dibutyltin dilaurate (its addition is 0.5% of the total ma...

Embodiment 2

[0081] raw material:

[0082] a) 2,2-bis[(2-propenyloxy)methyl]-1-butanol: TCI Company; the structural formula is as follows:

[0083]

[0084] b) caprolactone: TCI company; Structural formula is as follows:

[0085]

[0086] c) 3,6-dioxa-1,8-octanedithiol, TCI company; its structural formula is as follows:

[0087]

[0088] d) tetraallyloxyethane, TCI company; Its structural formula is:

[0089]

[0090] e) 1-hydroxycyclohexyl phenyl ketone (UV-184): TCI company;

[0091] f) stannous octoate: TCI company;

[0092] g) 1,5,7-Triazabicyclo[4.4.0]dec-5-ene / ketoprofen complex: TCI Company;

[0093] h) Toluene: Aladdin (Shanghai) Reagent Company;

[0094] i) n-Hexane: Aladdin (Shanghai) Reagent Company;

[0095] Preparation:

[0096] Weigh 0.35mol of caprolactone, 8mmol of 2,2-bis[(2-propenyloxy)methyl]-1-butanol and 0.5mmol of stannous octoate, and heat to 120°C for 10 hours under argon atmosphere . After the resulting product was dissolved in 50mL of toluene,...

Embodiment 3

[0099] raw material:

[0100] a) polyethylene glycol acrylate (PEGDA): molecular weight M n =3458, Sigma-Aldrich company; Structural formula enters as follows:

[0101]

[0102] b) hydroxyethylacrylamide: Sigma-Aldrich company; structural formula is as follows:

[0103]

[0104] c) benzophenone peroxide: Sigma-Aldrich company;

[0105] d) 1,5,7-Triazabicyclo[4.4.0]dec-5-ene: TCI Company;

[0106] e) N, N-dimethylformamide (DMF): TCI company;

[0107] Preparation:

[0108] Weigh 0.5g PEGDA and 0.07g hydroxyethylacrylamide in 0.5mL DMF to form a clear solution at 60°C, then add BPO (the amount added is 1.5% of the system mass) and 1,5,7-triazol Heterobicyclo[4.4.0]dec-5-ene / ketoprofen complex (the addition amount is 1.5% of the system mass). Then the precursor solution was transferred to a sealed glass tank and kept at 100°C for 24 hours. The resulting film was dried in a vacuum oven at 80 °C for 24 h.

[0109] Polymer network topology isomerization process: the sp...

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Abstract

The invention discloses a polymer network topology heterogeneous system based on dynamic covalent bonds. The polymer topology heterogeneous network system is a cross-linked polymer containing the dynamic covalent bonds, and the topology structure in the polymer topology heterogeneous network system is in a thermodynamic unsteady state temporarily fixed by the dynamic covalent bonds; and when the action and the temperature of a bond exchange catalyst reach the activation temperature of the dynamic covalent bonds or above, the dynamic covalent bonds are subjected to a bond exchange reaction, andthe topological structure is changed. The invention further provides an application method of the polymer network topology heterogeneous system based on the dynamic covalent bonds. The topological structure in the high-molecular network topological heterogeneous system provided by the invention can generate specific isomerism as required to realize regulation and control of related physical properties of the polymer, and the isomerism process of the topological structure can be carried out regionally step by step for multiple times.

Description

technical field [0001] The invention belongs to the field of new functional materials, and specifically relates to a dynamic covalent bond-based polymer network topology isomerism system and an application method thereof. Background technique [0002] Polymer dynamic covalent network is a kind of polymer material with dynamic covalent bonds inside the network. Under the action of external stimuli (including heating, light, redox, etc.), the dynamic covalent bonds in the network will continuously break and recombine. [0003] The traditional polymer dynamic covalent network is mainly used in the following fields: 1) Self-healing of polymer materials: After the polymer material is physically damaged, the polymer network at the damaged site (cracks or gaps, etc.) is also destroyed. ring. By activating the bond exchange reaction of dynamic covalent bonds inside the network, the network can be dynamically broken and reorganized, so the damaged network can be reconnected into th...

Claims

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Application Information

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IPC IPC(8): C08L75/06C08L67/04C08L51/08C08L53/00C08J3/24C08J3/28
CPCC08J3/24C08J3/28C08J2351/08C08J2353/00C08J2367/04C08J2375/06
Inventor 谢涛金斌杰吴晶军赵骞
Owner ZHEJIANG UNIV
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