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从分子设计的基本原理出发，制备了分子链节中具有磺酸及羧基官能团的苯乙烯－丙烯酸共聚型高分子湿敏材料．通过测定表明，羧基基团的引入降低了苯乙烯磺酸盐的湿滞性，缩短了它的响应恢复时间．通过优化选择，获得了性能优良的共聚体，其羧基与磺酸基之比为１：４．用此共聚体制成的元件在１０％～１００％ＲＨ范围内电阻变化３～４个数量级，并随电阻的对数呈线性变化．湿滞值可降至２％ＲＨ，响应时间３ｓ，恢复时间１５ｓ，在自然环境中长期放置相对漂移小．
Starting from the basic principle of molecular design, a styrene-acrylic acid copolymer macromolecule moisture-sensitive material with sulfonic acid and carboxyl functional groups in the molecular chain was prepared. The results showed that the introduction of carboxyl groups reduced the wet retardancy of styrene sulfonate and shortened the response recovery time. By optimizing the selection, the copolymer with excellent properties was obtained, the ratio of its carboxyl group to sulfonic acid group was 1: 4. Components made with this copolymer in the range of 10% to 100% RH resistance changes 3 to 4 orders of magnitude, and linear with the resistance of the logarithm. Wet hysteresis can be reduced to 2% RH, the response time of 3s, the recovery time of 15s, long-term placement in the natural environment relatively small drift.