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

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...

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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

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