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首页> 外文会议>Fiber Optic Sensor Technology and Applications >Aminated poly(vinylbenzylchloride-co-245-trichlorophenyl acrylate) microspheres for optical pH sensing
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Aminated poly(vinylbenzylchloride-co-245-trichlorophenyl acrylate) microspheres for optical pH sensing

机译：用于光学pH传感的胺化聚（乙烯基苄基氯-co-245-丙烯酸三氯苯酯）微球

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Abstract: Lightly crosslinked monodisperse poly(vinylbenzylchloride-co- 2,4,5-trichlorophenylacrylate) microspheres were prepared by dispersion polymerization. Then microspheres were derivatized with various secondary amines to convert the vinylbenzylchloride to a pH sensitive amine. These microspheres were embedded in poly(vinylyalcohol) hydrogel to form a membrane. Optical sensitivity of this membrane for pH is based on refractive index changes accompanying swelling and shrinking of the polymer microspheres. The membrane appears turbid (opaque-white) because the refractive index of microspheres is greater than that of the hydrogel. 2,4,5- trichlorophenyl acrylate (TCPA) was added into the polymer formulation in order to introduce porosity and hydrophilicity to the microspheres. In the amination procedure, the large 2,4,5-trichlorophenol group is replaced by the smaller amine forming a more hydrophilic amide. This shortened the response time of the membrane from hours to a few seconds. The membrane is more turbid at short wavelengths. In addition, turbidity of the membrane increases as the pH of solution increases. There is a linear relation between microsphere concentration of the membrane and its turbidity. The range in which the membrane is sensitive to pH is from 6 to 8.5, with an apparent pK$-a$/ of 7.5. !13
机译：摘要：通过分散聚合制备了轻度交联的单分散聚（乙烯基苄基氯-co-2,4,5-三氯苯基丙烯酸酯）微球。然后将微球用各种仲胺衍生化，以将乙烯基苄基氯转化为pH敏感胺。这些微球包埋在聚乙烯醇水凝胶中以形成膜。该膜对pH的光学敏感性基于伴随聚合物微球膨胀和收缩的折射率变化。因为微球的折射率大于水凝胶的折射率，所以膜显得浑浊（不透明白色）。为了将孔隙率和亲水性引入微球，将2,4,5-丙烯酸三氯苯基酯（TCPA）添加到聚合物配方中。在胺化过程中，较大的2,4,5-三氯苯酚基团被较小的胺取代，形成了更亲水的酰胺。这将膜的响应时间从数小时缩短到几秒钟。该膜在短波长下更混浊。另外，膜的浊度随着溶液pH的增加而增加。膜的微球浓度与其浊度之间存在线性关系。膜对pH敏感的范围是6至8.5，表观pK $ -a $ /为7.5。 ！13

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