以醋酸纤维素为基质，采用包埋法固定pH指示剂刚果红，制备了一种平均厚度为10 μm光化学pH敏感膜（CCM）。利用扫描电镜、红外光谱仪、紫外可见光谱仪及视频接触角分析仪对CCM组成、结构和形貌等进行了表征，对其pH响应性能以及与pH振荡反应的响应行为进行考察。结果表明，在pH值为2.7～7.2范围内，CCM薄膜具有良好响应性，能够实现吸光强度与pH振荡的同步性。醋酸纤维素与刚果红分子间丰富的相互作用是分散与固定化刚果红的主要原因。经碱水解处理可增加薄膜中的羟基，提高薄膜润湿性及溶胀性，从而能够有效提高薄膜的响应性。

The pH sensitive optical film (CCM) with a thickness of about 10 μm was prepared by embedding Congo red in cellulose acetate. The composition, structure and morphology of CCM were characterized by scanning electron microscope, infrared spectrophotometer, UV adsorption spectrometer and contact angle analyzer, respectively. In addition, the responsive performance of CCM was evaluated. The following results were obtained. The CCM has excellent responsive performance for pH change, and excellent synchronous responsivity with pH oscillation reaction. The excellent responsive performance is attributed to the abundant interaction between cellulose acetate and Congo red. Additionally, the hydrolysis of cellulose acetate in alkaline condition can increase the amount of hydroxyl groups, which enhances the CCM responsive performance due to increasing swelling property and wettability.