Six-arm thermosensitive polymer and preparation method thereof

A temperature-sensitive polymer and temperature-sensitive monomer technology, applied in the fields of polymer chemistry and material chemistry, can solve problems such as difficulty in control, affecting polymer properties and scope of use, and runaway functionality at the end of the chain structure. Good effect for allergy

Active Publication Date: 2017-02-01
GUANGDONG UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Because the traditional free radical polymerization is not easy to control, it is easy to cause the molecular weight, molecular weight distribution, chain structure and terminal functionality of the polymer to be out of control, and sometimes even branching, cross-linking and other reactions occur, which seriously affects the performance and application range of the polymer.

Method used

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  • Six-arm thermosensitive polymer and preparation method thereof
  • Six-arm thermosensitive polymer and preparation method thereof
  • Six-arm thermosensitive polymer and preparation method thereof

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preparation example Construction

[0042] The present application also provides a preparation method of the above-mentioned thermosensitive polymer, comprising the following steps:

[0043] A), under inert gas and anhydrous conditions, react dipentaerythritol, an acid-binding agent, a catalyst and an acylating agent having a structure of formula (II) in a solvent to obtain an initiator having a structure of formula (III);

[0044] B), under the protection of an inert gas, react the initiator, temperature-sensitive monomer, catalyst and complexing agent in a solvent to obtain an active temperature-sensitive polymer with a structure of formula (IV); the temperature-sensitive The neutral monomer is selected from N-isopropylacrylamide, N-propylacrylamide, N-cyclopropylacrylamide, N,N-diethylacrylamide, N-vinylisopropanamide, N-vinyl N-propionamide, N-vinylcaprolactam, N-vinylpyrrolidone, N-acryloylpyrrolidine, N-acryloyl-N'-n-propiperazine, N-(2,2-dimethyl-1,3 One or more of -dioxan-5 alcohol)-acrylamide and N-(2-...

Embodiment 1

[0072]Add dipentaerythritol (2.55g, 10mmol) into a solution containing triethylamine (6.19g, 61mmol) and 50ml of dichloromethane, and stir for 30min under ice-bath conditions. 2-Bromoisobutyryl bromide (14.07 g, 61 mmol) was added slowly over 1 hour through a constant pressure dropping funnel, and the temperature was kept at low temperature for 1-2 hours. Then it was gradually raised to room temperature, and the reaction was continued for 12 hours. After the reaction, the obtained product was washed successively with 5% sodium bicarbonate solution (100ml*3), saturated saline (100ml*3), and deionized water (100ml*3). The washed organic layer was rotary evaporated to remove the solvent, dissolved in dichloromethane, slowly added dropwise into glacial ether, and left standing at 0°C for 12 hours. Filter through a funnel and wash with cold diethyl ether (10ml). At room temperature, dry in a vacuum oven to obtain a white crystal initiator. figure 1 The initiator prepared for thi...

Embodiment 2

[0078] Dipentaerythritol (2.55g, 10mmol) was added to a solution containing pyridine (5.135g, 65mmol) and 100ml of tetrahydrofuran, and stirred for 30min under ice-bath conditions. 2-Bromoisobutyryl bromide (14.95 g, 65 mmol) was slowly added through a constant pressure dropping funnel over 1 hour, and kept at low temperature for 1-2 hours. Then it was gradually raised to room temperature, and the reaction was continued for 24 hours. After the reaction, the obtained product was washed successively with 5% sodium bicarbonate solution (100ml*3), saturated saline (100ml*3), and deionized water (100ml*3). The washed organic layer was rotary evaporated to remove the solvent, dissolved in dichloromethane, slowly added dropwise into glacial ether, and left standing at 0°C for 12 hours. Filter through a funnel and wash with cold diethyl ether (10ml). At room temperature, dry in a vacuum oven to obtain a white crystal initiator.

[0079] Add 1 g of N-isopropylacrylamide, 0.3363 g of...

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Abstract

The application provides a thermosensitive polymer having a structure as shown in formula (I). The thermosensitive polymer takes dipentaerythritol as a core, and is prepared by enabling the dipentaerythritol to react with an acylating agent so as to obtain an initiator, then carrying out atom transfer radical polymerization on the initiator and a thermosensitive monomer to obtain an active thermosensitive polymer with uniform chain length and controllable molecular weight, and finally, carrying out an azido reaction on the tail end of the polymer to obtain the thermosensitive polymer having an azide group at the tail end. Compared with the prior art, the polymer provided by the application has the characteristics of being simple, convenient and easy to implement, has controllable arm number and arm length, and is flexible and adjustable in structure and convenient to modify; furthermore, the thermosensitive polymer has good thermosensitivity and a use scope close to environment temperature, thus having good application prospect.

Description

technical field [0001] The invention belongs to the fields of polymer chemistry and material chemistry, and in particular relates to a six-arm temperature-sensitive polymer and a preparation method thereof. Background technique [0002] The multi-armed star polymer is a kind of polymer with a star-like structure composed of multiple polymer arms connected to the core through covalent bonds and together with the core; due to its special three-dimensional spherical branched structure and properties, star polymers have become one of the hotspots in the field of polymer materials. Star polymers have more terminal functional groups, which can be modified to obtain polymers with different structures and properties. Temperature-sensitive star polymers are a class of polymers that can respond to slight changes in the external environment temperature, resulting in corresponding changes in physical structure and chemical properties or even mutations. The temperature at which the pha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F120/54C08F126/02C08F126/06C08F8/30
CPCC08F8/30C08F120/54C08F126/02C08F126/06
Inventor 朱东雨薛延敏郭建维陈欣杰李雄
Owner GUANGDONG UNIV OF TECH
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