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将２羟基３甲基丙烯酰氧丙基氯化三甲铵（ＨＭＰＴＡＣ）与苯乙烯（Ｓｔ）进行共聚反应，所得产物有良好的感湿性。用以制成的湿度传感器测湿范围宽（为１０％～９０％ＲＨ），再现性好（在±２％ＲＨ以内），耐环境变化。放置１２０天以上，感湿性能变化较小（在±３％以内）。
The 2 hydroxy 3 methacryloyloxypropyl trimethylammonium chloride (HMPTAC) with styrene (St) copolymerization reaction, the resulting product has good humidity. The humidity sensor is used to measure the wetting range (10% -90% RH), good reproducibility (within ± 2% RH) and resistance to environmental changes. When placed for more than 120 days, there is little change in wet feel (within ± 3%).