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A method for preparing precise polymer networks

A polymer, linear polymer technology, applied in the field of functional polymers, can solve the problems of not meeting the multi-functionality requirements for preparing gel network, restricting applications, etc., to achieve molecular structure, precise and controllable function, and diverse molecular topology. Effect

Inactive Publication Date: 2015-11-18
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, the initiation point of the active radical polymer can only undergo monofunctional end group conversion, that is, one active initiation point generates an azide or alkyne group, which cannot meet the multifunctionality requirements of the preparation of the gel network. Greatly Limits the Application of Combining Living Radical Polymerization and Click Chemistry to Prepare Functional Polymer Gel Networks

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Embodiment 1: Preparation of polystyrene / polyethylene glycol amphiphilic gel

[0041] a) Accurately weigh 3g of dodecyltrithioisobutyric acid, 3.1642g of 1-ethyl-(3-dimethylaminopropyl)carbodiimide hydrochloride, dissolve in 80ml of dichloromethane, and Stir under nitrogen atmosphere for 10 minutes. Add 0.255 g of ethylene glycol and react for 24 hours. After the reaction, the reaction solution was washed three times with 1mol / L sodium bicarbonate and distilled water, and the organic phase was dried with anhydrous magnesium sulfate. After filtering the anhydrous magnesium sulfate, dichloromethane was removed with a rotary evaporator. Separation, the eluent is n-hexane:dichloromethane=1:1, to obtain 1.3g of didodecanyl trithiocarbonate.

[0042] RAFT polymerization of polystyrene: use 0.833ml of styrene as monomer, azobisisobutylcyanide (0.00119g) as initiator, didodecyl trithiocarbonate (0.09558g) as chain transfer agent, mol The ratio is 50:0.05:1, the reaction temp...

Embodiment 2

[0049] Embodiment 2: Preparation of polystyrene / polyethylene glycol amphiphilic gel

[0050] The basic process and operation are the same as in Example 1, the difference is that:

[0051] In step a), the styrene monomer is 16.6ml, and the initiator azobisisobutylcyanide is 0.476g;

[0052] In step b), 1.42g of N-3-bromopropylmaleimide is taken, and 0.09g of initiator azobisisobutylcyanide is used;

[0053] In step c), take 4.75ml of β-pinene and take 0.05g of the initiator azobisisobutyronitrile.

[0054] The rest are completely consistent with Example 1.

Embodiment 3

[0055] Embodiment 3: Preparation of polystyrene / polyethylene glycol amphiphilic gel

[0056] The basic process and operation are the same as in Example 1, the difference is that:

[0057] In step a), the styrene monomer is 5ml, and the initiator azobisisobutylcyanide is 0.003g;

[0058] In step b), 0.124g of N-3-bromopropylmaleimide and 0.0009g of initiator azobisisobutylcyanide;

[0059] In step c), β-pinene 0.095ml, initiator azobisisobutyronitrile (0.0005g).

[0060] The rest are completely consistent with Example 1.

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Abstract

The invention discloses a method for preparing an accurate polymer network. The number of azide functional groups at the tail end of a polymer is controlled accurately by using a method combining reversible addition-fragmentation chain transfer (RAFT) and click chemistry, so that the number of crosslinking points is controlled and a regular polymer cross-linked network structure is prepared. In the method disclosed by the invention, gel in the polymer network is generated by performing a click reaction on two or more accurately-controlled functional end group azide or alkyne functional groups (E) at the tail end of a polymer chain and two or more end alkynyl or azide functional groups (E) via multiple steps of RAFT. The method has the advantages of accurate controllability of the number of crosslinking points and density of a polymer cross-linked network structure and suitability for various polymer network structures containing different functional groups.

Description

technical field [0001] The invention belongs to the field of functional macromolecules, and relates to a method for preparing a precise polymer network structure by controlling the number of polymer terminal functional groups based on molecular design. Background technique [0002] Polymer network structures, especially hydrogels, are materials that have the most similar properties and performances to biological tissues. Hydrogel is a polymer network formed by the cross-linking of hydrophilic polymers. In the gaps of the polymer network, some small molecular substances can move like in biological membranes to transmit information and substances. Polymer networks with high strength and precise molecular structure and function have important application prospects in bionic organs with membrane functions, such as artificial blood vessels, kidneys, and skin, due to their biomembrane-like functions. Therefore, high-strength functional hydrogels will play a pivotal role in the fu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G81/02C08F293/00C08F8/30
Inventor 付国东周超
Owner SOUTHEAST UNIV
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