光敏引发AM/DAC共聚的竞聚率测定和序列分布

Reactivity Ratio Determination and Sequence-Length Distribution of AM/DAC Copolymerization Initiated by Photosensitizer

以丙烯酰胺(AM)和丙烯酰氧乙基三甲基氯化铵(DAC)为单体,2,2’-偶氮二异丁基脒盐酸盐(V-50)为光敏引发剂,在紫外光照射下进行水溶液聚合,采用Fineman-Ross、Kelen-Tudos及Yezrielev-Brokhina-Roskin法计算了单体竞聚率,得出光敏引发条件下,AM和DAC的竞聚率分别为2.2784和0.3836。分析了单体组成、共聚物瞬时组成随转化率变化的关系及共聚物主链的序列长度分布,得出采用AM起始物质的量比为0.8且总转化率在80%以下的合成工艺条件,可得到组成相对均一的AM/DAC共聚物。运用差示扫描量热仪对共聚物结构进行分析表征,表明所得聚合物是AM/DAC共聚物。

The reactivity ratios of polymerization of acrylamide （AM） and 2-acryloyloxyethyl-trimethy- lammonium chloride （DAC） solution system with V-50 as photosensitizer were studied at certain condition under UV irradiation by the methods of Fineman-Ross, Kelen-Tudos and Yezrielev-Brokhina-Roskin. The results indicate that, the reactivity ratios of AM and DAC are 2. 2784 and 0. 3836 respectively at the condition of the photosensitive- initiation. The relations between molar ratio of monomers, instantaneous composition of copolymer with conversion and sequence-length distribution in the copolymers were analyzed. As a result, the technological condition of gaining relatively uniform AM/DAC copolymer is that the origination molar percentage of AM is 0.8 and the total conversion is under 80%. The copolymers were characterized by the differential scanning calorimetry. The results show that obtained polymer is copolymer of AM and DAC, not blends of two kinds of homopolymer.