Method for preparing polymer brush films with multiple stimulation responses

A multi-stimulus-responsive, polymer brush technology, applied in the homogeneous ATRP preparation of multi-stimulus-responsive polymer brush films, and the field of polymer brush film preparation, to achieve the effect of wide applicability and broad application prospects

Inactive Publication Date: 2013-01-16
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the use of homogeneous ATRP method to prepare multiple stimuli-responsive polymer brushes has not been reported yet.

Method used

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  • Method for preparing polymer brush films with multiple stimulation responses
  • Method for preparing polymer brush films with multiple stimulation responses
  • Method for preparing polymer brush films with multiple stimulation responses

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The synthesis of embodiment 1 initiator 4-(2-bromoisobutyramide) butyltriethoxysilane

[0046] Add 12.6 ml of 4-aminobutyltriethoxysilane to 50 ml of anhydrous tetrahydrofuran, and transfer it to an ice-water bath at 0°C, add 10 ml of 2-bromoisobutyryl bromide dropwise, and then add 15 ml The acid-binding agent triethylamine was maintained in an ice-water bath for 2 hours, and then the reaction was transferred to room temperature for 24 hours. After filtration, the filtrate was rotary evaporated to completely remove THF to obtain a yellow-brown product. The calculated yield was 85%. Fig. 2 is its solution appearance and infrared spectrogram.

Embodiment 2

[0047] The synthesis of embodiment 2 initiator 3-(2-bromoisobutyramide) propyltriethoxysilane

[0048] Add 12.6 ml of 3-aminopropyltriethoxysilane to 50 ml of anhydrous tetrahydrofuran, and transfer it to an ice-water bath at 0°C, add 12.6 ml of 2-bromoisobutyryl bromide dropwise, and then add 14.3 ml Acid-binding agent triethylamine, after maintaining in an ice-water bath for 2 hours, transfer the reaction to room temperature and react for 24 hours. After filtration, the filtrate is rotary evaporated to remove tetrahydrofuran completely, and the yellow-brown product 3-(2-bromoisobutyramide) is obtained. Propyltriethoxysilane Initiator. Fig. 3 is its deuterated chloroform solution nuclear magnetic spectrum. NMR characterization: 1 H-NMR (CDCl 3 , 400MHz, TMS), δ: 6.89 (s, 1H, NH), 3.83 (q, 6H, J=6.8Hz, (CH 3 CH 2 O) 3 Si), 3.27 (q, 2H, J=6.8Hz, NCH 2 ), 1.95 (s, 6H, CH 3 C), 1.62~1.70 (m, 2H, CCH2), 1.23 (t, 9H, J=6.8Hz, (CH 3 CH 2 O) 3 Si), 0.65(t, 2H, J=8.4Hz, SiC...

Embodiment 3

[0050] The synthesis of embodiment 3 initiator 3-(2-bromoisobutyramide) propyltriethoxysilane

[0051] Except that the acid-binding agent was changed to pyridine, the same steps as in Example 2 were followed to obtain the tan product 3-(2-bromoisobutyramide)propyltriethoxysilane initiator. Fig. 3 is its deuterated chloroform solution nuclear magnetic spectrum.

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Abstract

The invention relates to a method for preparing polymer brush films with multiple stimulation responses by homogeneous phase atom transfer radical polymerization (ATRP). According to the method, the polymer brush films are N,N-diamido ethyl methacrylate polymers and have multiple stimulation responses on temperature, pH value, salt and a solvent. The homogeneous phase ATRP preparation method comprises the following steps of: synthesizing an initiator omega-(2-bromoisobutyramide)alkyl silane coupling agent; assembling the initiator on the clean surface of a substrate; and performing surface-initiated atom transfer radical polymerization in a homogeneous system. According to the method, the grafting density and film thickness of a polymer brush can be regulated and controlled by regulating the assembly density and the content of bulk phase monomers of the initiator on the surface of the substrate, so that the polymer brush films which have different structures and multiple stimulation responses can be obtained. The method is mild in reaction condition, easy to control, adjustable in grafting density, high in polymerization efficiency and wide in applicability.

Description

technical field [0001] The invention belongs to the technical field of micro-nano preparation, specifically relates to a preparation method of a polymer brush film, and more particularly relates to a homogeneous ATRP preparation method of a multiple stimulus-responsive polymer brush film. Background technique [0002] Polymer brush refers to a special polymer structure formed by grafting polymer molecular chains with high density and certain length on the surface or interface of the substrate. The research on polymer brushes has received extensive attention in the past ten years. At present, the research of grafting environmental stimulus-responsive polymers on the surface of materials to construct smart polymer brush films has aroused great interest, because its surface morphology, surface properties and composition are intelligently responsive to changes in the external environment, It has extensive and important applications in the construction design of nanomaterials, b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/48C03C17/28C08F292/00C08F220/34
Inventor 韩霞朱洪帆刘洪来张旭霞尹全义
Owner EAST CHINA UNIV OF SCI & TECH
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