A method for preparing dual stimuli-responsive surfaces by secondary photopolymerization

A stimuli-responsive, secondary light technology, applied in the field of preparing dual stimuli-responsive surfaces through secondary photopolymerization, can solve the problems of easy shedding of surface compounds, easy aging of polymers, complicated reaction process, etc., and achieve good photoresponse performance. , good pH response performance, strong grafting effect

Active Publication Date: 2017-04-12
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The construction of responsive smart surfaces by modifying stimuli-responsive compounds on the surface of various substrates is mainly divided into physical methods and chemical methods. In physical methods, compounds and surfaces Generally rely on non-covalent bonding, surface compounds are easy to fall off; and chemical methods such as surface-induced redox polymerization, atom transfer radical polymerization, layer-by-layer self-assembly, etc., graft compounds on the surface in the form of covalent bonds, but large Some methods are more complicated and time-consuming and energy-consuming
For example, Abdullah M.Alswieleh and others grafted pH-responsive compounds on the surface of silicon wafers by atom transfer radical polymerization (ATRP) to make the surface have pH-responsive properties. materials are prone to aging (A.M.Alswieleh, N.Cheng, G.J.Leggett, Langmuir: the ACS journal of surfaces and colloids, 30(2014) 1391-1400); Yueguo Dong et al. used photopolymerization method to graft temperature-responsive compound N on the surface - Isopropylacrylamide prepared temperature-stimuli-responsive surfaces (Y.Dong, X.Zhu, F.Shi, J.Nie, Applied Surface Science, 307(2014) 7-12), although a simple and fast surface light Polymerization method, but using only one type of photoinitiator to prepare a single environment (temperature) responsive surface

Method used

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  • A method for preparing dual stimuli-responsive surfaces by secondary photopolymerization
  • A method for preparing dual stimuli-responsive surfaces by secondary photopolymerization
  • A method for preparing dual stimuli-responsive surfaces by secondary photopolymerization

Examples

Experimental program
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Effect test

Embodiment 1

[0048] Embodiment 1: surface modification of quartz sheet

[0049] (1), silanization of quartz sheet: immerse the quartz sheet successively in ethanol, acetone, and deionized water for ultrasonic treatment for 5 minutes, blow dry with nitrogen, and put into "piranha" solution [concentrated sulfuric acid (98%wt.%) and hydrogen peroxide (30%wt.%) heated in a volume ratio of 7:3] for 2 hours, then rinsed with a large amount of deionized water, and dried with nitrogen to make the surface rich in hydroxylation. Take 10 mg of γ-methacryloxypropyltrimethoxysilane (γ-MPS) and add it to 10 mL of toluene solution, and immerse the hydroxylated quartz plate in it for 12 hours. Due to hydrolytic condensation, the surface of the quartz plate will be grafted A silane coupling agent with a double bond; wash the substrate grafted with the silane coupling agent with ethanol, and dry it with nitrogen gas for later use.

[0050] (2), preparation of pH-responsive photopolymerization system soluti...

Embodiment 2

[0053] Embodiment 2: surface modification of glass sheet

[0054] (1), glass sheet silanization: the glass sheet is immersed in ethanol, acetone, deionized water and ultrasonically cleaned for 5 minutes, blown dry with nitrogen, and put into "piranha" solution [concentrated sulfuric acid (98%wt.%) and hydrogen peroxide (30%wt.%) heated in a volume ratio of 7:3] for 2 hours, then rinsed with a large amount of deionized water, and dried with nitrogen for later use. Take 10mg of γ-methacryloxypropyltrimethoxysilane (γ-MPS) and add it to 10mL of toluene solution, immerse the hydroxylated glass sheet in it for 12 hours, and graft the silane coupling agent with double bond on the surface of the glass sheet ; Clean the glass piece grafted with silane coupling agent with ethanol, and dry it with nitrogen gas for later use.

[0055] (2), prepare the photopolymerization system solution (DMAEMA-80wt.%, ethanol 9.9wt.%,-photoinitiator 2-hydroxyl-2 methyl-1-phenyl ketone-0.1wt.% of cross-...

Embodiment 3

[0059] Embodiment 3: silicon wafer surface modification

[0060] (1), silicon wafer surface silanization: the silicon wafer is successively immersed in ethanol, acetone, deionized water and ultrasonically cleaned for 5 minutes, blown dry with nitrogen, and put into "piranha" solution [concentrated sulfuric acid (98%wt.%) and Hydrogen peroxide (30%wt.%) was heated in a volume ratio of 7:3] for 4 hours, then rinsed with a large amount of deionized water, and dried with nitrogen gas for later use. Take 10mg of γ-methacryloxypropyltrimethoxysilane (γ-MPS) and add it to 10mL of toluene solution, immerse the hydroxylated silicon chip in it for 12 hours, and graft the silane coupling agent with double bond on the surface of the silicon chip ; Clean the silicon chip grafted with silane coupling agent with ethanol, and dry it with nitrogen gas for later use.

[0061] (2), prepare pH-responsive photopolymerization system solution (DMAEMA-20wt.%, ethanol 74wt.%, -photoinitiator 2-hydrox...

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Abstract

The invention discloses a method for preparing double-stimulation responsive surface through secondary photopolymerization, relating to the field of grafting and modification of various base material surfaces. The method comprises the following steps: I, grafting pH responsive compound onto the surface by adopting a cracking type photoinitiator, wherein the pH responsive compound grafted onto the surface can be used as a hydrogen donor and a co-initiator of the next step reaction; and II, performing photopolymerization reaction on the basis by adopting a hydrogen abstracting type initiator, and grafting the double bond-modified photoresponse compound. The method not only has the advantage that the photopolymerization is efficient, energy-saving, economical, environment-friendly, and the like, but also the compound is difficult to drop after being grafted onto the surface through a covalent bond manner. The prepared intelligent surface has good photoresponsiveness, pH responsiveness, and the swelling property and wettability of the surface polymer can be reversibly controlled. The surface has potential application on the aspects of surface molecule switches, surface controlled release and ion adsorption due to good controllable wettability and mechanical effect.

Description

technical field [0001] The invention relates to grafting and modifying the surfaces of various base materials, and adopts different types of photoinitiators to prepare double stimulus responsive surfaces through a secondary photopolymerization method. Background technique [0002] There are some plants and animals that can respond to environmental stimuli in nature, such as mimosa, sunflower, chameleon and so on. Imitating these animal and plant phenomena, discovering and synthesizing some stimuli-responsive materials has aroused great interest of scientists. These compounds can produce wettability, volume, Changes in shape, mechanical properties, etc. With the development of society, fully researching and using these stimuli-responsive compounds to prepare smart materials will attract more and more attention. In the past few years, the main research was on the properties of the compound itself, focusing on solution and gel systems. In recent years, grafted stimuli-respons...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F292/00C08F255/02C08F283/00C08F220/34C08F222/14C08F222/20C08F2/48C08J7/18
Inventor 聂俊武少鹏朱晓群
Owner BEIJING UNIV OF CHEM TECH
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