A kind of ionic poss block copolymer base humidity sensor and preparation method

Abstract

The invention relates to an ionic-type polyhedral oligomeric silsesquioxane (POSS) block copolymer based humidity sensor and a preparation method thereof. The humidity sensitivity performance of the ionic-type POSS block copolymer based humidity sensor is improved through solvent annealing and porous CuO doping methods. An ionic-type POSS block copolymer selects a POSS grafted methyl methacrylatetype-sulfonated styrene block copolymer prepared by the research group, two types of topological structures, namely the star type and the tadpole type, of the polymer and the different block ratios (1:1)-(1:3) are researched, the humidity sensor with the excellent humidity sensitivity performance is prepared, through solvent annealing, hydrophilic and hydrophobic phases of the humidity sensor arepromoted to be separated, the durability and mechanical properties of a humidity sensitive material can be improved significantly, and the sensitivity of the ionic-type POSS block copolymer based humidity sensor is advantageously improved through doping of porous CuO.

Description

technical field [0001] The invention belongs to a polymer humidity sensor and a preparation method, and relates to an ion-type POSS block copolymer-based humidity sensor and a preparation method. Background technique [0002] In recent years, various types of amphiphilic polymer materials have been developed for use in humidity sensors. At present, the bottleneck in the development of polymer humidity sensors lies in the water resistance under high humidity (>80%RH). The strong interaction between the hydrophilic groups of amphiphilic polymers and water molecules can easily cause the aggregation of hydrophilic groups. Therefore, when more water molecules are adsorbed, it may cause partial dissolution of the sensitive substance, resulting in instability or even failure of the humidity sensitive element under high humidity. [0003] At present, the stability of the humidity sensor is often improved by preparing a humidity-sensitive film with a cross-linked structure, but ...

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Problems solved by technology

Therefore, when more water molecules are adsorbed, it may cause partial dissolution of sensitive substances, resulting in instability or even failure of the humidity sensitive element under high humidity.

[0003] At present, the stability of the humidity sensor is often improved by preparing a humidity-sensitive film with a cross-linked structure, but the cross-linking reaction is usually carried out under solid-state conditions, and the controllability of the reaction itself is relatively small if the structure of the film-formed polymer is modified. Poor; it is not easy to mass-produce components with good parallelism by using cross-linking reactions; the reaction center of some cross-linking reactions is the center of polar groups, which is not conducive to controlling the moisture-sensitive properties of polymers

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