改性聚酰胺-胺阴离子树状聚合物的性能研究  

Characterization of Modified Polyamidoamine Anionic Dendrimer

作　　者：彭晓春[1,2] 彭晓宏[3] 赵建青[3] 彭密军[1] 

机构地区：[1]吉首大学林产化工工程湖南省重点实验室,湖南张家界427000 [2]吉首大学化学化工学院,湖南吉首416000 [3]华南理工大学材料科学与工程学院,广东广州510640

出　　处：《石油化工》2011年第8期889-894,共6页Petrochemical Technology

基　　金：林产化工工程湖南省重点实验室开放基金资助项目(JDZ201104);湖南省自然科学基金资助项目(06JJ2067)

摘　　要：研究了改性聚酰胺-胺（PAMAM）阴离子树状聚合物的特性黏数（[η]）、热稳定性和絮凝性能。实验结果表明，该类树状聚合物的[η]随代数的增加先增大后减小，出现一个极大值。PAMAM／N烯酸钠（SAA）、含聚氧乙烯（PEO）链端的PAMAM／SAA（PAMAM／SAA／PEO）阴离子树状聚合物的[η]极大值分别出现在第4．0代附近、第5．0～6．0代附近；随PEO相对分子质量的增加，PAMAM／SAA／PEO阴离子树状聚合物的[η]减小。热分析结果表明，改性PAMAM阴离子树状聚合物具有逐层热分解行为，热稳定性与分子外围端基有关，PAMAM／SAA／PEO阴离子树状聚合物具有更好的热稳定性，最大热失重速率对应的温度可达388℃。改性PAMAM阴离子树状聚合物具有一定的絮凝性能，絮凝性能随代数、PEO链长的增加而增强；改性PAMAM阴离子树状聚合物的最佳浓度为30mg／L（不是所有的改性PAMAM阴离子树状聚合物的最佳浓度都是30mg／L），上层清液的透光率达85％以上。The intrinsic viscosities, thermal stabilities and flocculations of the modified polyamidoamine （PAMAM） anionic dendrimers were studied. The results showed that the intrinsic viscosities of the dendrimers increased at first and then decreased with the increase of the generation number. The maximum intrinsic viscosities of PAMAM/sodium acrylate （SAA） and PAMAM/SAA/polyoxyethylene （ PAMAM/ SAA/PEO） anionic dendrimers were at about G4. 0 and between GS. 0 and G6. 0, respectively. The intrinsic viscosities of PAMAM/SAA/PEO anionic dendrimers decreased with the increase of the numberaverage relative molecular mass of PEO macromonomers. The thermal analysis indicated that thermal decomposition of the modified PAMAM anionic dendrimer was of multiple steps, and the thermal stability depended on the exterior terminal groups. PAMAM/SAA/PEO anionic dendrimer has better thermal stability than the others, according to its maximum mass loss rate at 388℃. The modified PAMAM anionic dendrimers could easily flocculate. The flocculation would become stronger with increasing the generation number and the PEO chain length. The optimal mass concentration of the modified PAMAM anionic dendrimer is about 30 mg/L with over 85% transmittance of the upside clear liquid.

关 键 词：聚酰胺-胺阴离子树状聚合物 丙烯酸钠 特性黏数 热稳定性 絮凝性能 

分 类 号：TQ317.5[化学工程—高聚物工业]