该研究合成了一种新型水溶性大π共轭高分子———聚吡咯｛２ ，５［ 二（ 对二甲氨基苯甲烯）］｝（ＰＰＤＭＡＢ） ，它能溶于强酸的水溶液，在１ｍｏｌ／Ｌ 的盐酸中溶解度为０－５ ～１－０ｇ／１００ｍＬ．通过ＥＡ、ＸＰＳ、ＦＴＩＲ、ＵＶＶｉｓＮＩＲ、Ｉｎｓｉｔｕ ＵＶＶｉｓＮＩＲ 对ＰＰＤＭＡＢ进行了结构表征．通过质子化、碘掺杂、浓硫酸（９８ ％ ） 掺杂等处理，ＰＰＤＭＡＢ的电导率提高２～４ 个数量级（δ＝ １０ － ７ ～１０－ ５Ｓ／ｃｍ） ．在质子化、去质子化的过程中ＰＰＤＭＡＢ发生了可逆的颜色变化，本征态（ 综色） 质子态（ 墨兰色） ． This study synthesized a new type of water-soluble large π conjugated polymer --- polypyrrole  {2, 5  [bis (p-dimethylaminobenzyl)]} (PPDMAB), which can be dissolved in a strong acid aqueous solution , The solubility in 1mol / L hydrochloric acid is 0-5 ~ 1-0g / 100mL. The structure of PPDMAB was characterized by EA, XPS, FTIR, UVVisNIR and Insitu UVVisNIR. The conductivity of PPDMAB increased by 2 ~ 4 orders of magnitude (δ = 10 - 7 ~ 10 -5 S / cm) by protonation, iodine doping and doping with concentrated sulfuric acid (98%). In protonation and deprotonation, PPDMAB undergoes a reversible change in color, eigenstate (color synthesis)  proton state (cyan color).