采用可逆加成-断裂链转移聚合（RAFT聚合）技术，通过合成并使用具有双硫酯结构的化合物N-咔唑二硫代甲酸苄基酯（BCBD）RAFT试剂，以N,N-二甲基丙烯酰胺（DMAA）为单体，合成得到了 =9120，分子量分布窄（PDI<1.1），且链末端带发色团的聚合物PDMAA。PDMAA溶液在为0.1-2000 mg/L的浓度范围内，在波长为370 nm处的吸收强度与其浓度具有良好的线性关系。PDMAA作为基准物表征超滤膜的截留性能的研究结果表明，相对于PEG10000，PDMAA可以准确并且简易地表征超滤膜的截留性能，初步说明PDMAA作为基准物质的可行性，也表明RAFT活性聚合是制备性能优异超滤膜截留性能检测用基准物质的可行途径。

As Benzyl 9H-carbazole-9-carbodithioate(BCBD) was used as the RAFT reagent, Poly(N,N-Dimethyl Acrylamide)(PDMAA) with chromophore was synthesized by Reversible Addition-Fragmentation Chain Transfer (RAFT Polymerization) method. The average molecular weight of PDMAA is 9120 ( )with a low polydispersity(PDI<1.1). There is a good linear relationship between absorbance and the concentration of PDMAA when the concentration of PDMAA in the range of 0.1-2000mg/L at a wavelength of 370 nm. When the synthesized PDMAA was used to determining the retention performance of ultrafiltration membrane, the preliminary results showed the method was more simple and easy with a relative high degree of accurancy compare to the commercial PEG. It is also indicated the RAFT Polymerization is feasible way to develop novel standard substance. 

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