疏水改性聚丙烯酰胺P(AM/DiC_8AM)的合成及性能

Synthese and characterization of twin-tailed hydrophobic associating water-soluble copolymers P(AM/DiC_8AM)

采用二元单体胶束共聚,合成了孪尾疏水改性丙烯酰胺/N,N-二辛基丙烯酰胺二元共聚物[简称P(AM/DiC8AM)],成功引入了疏水单体。用FTIR分析了各基团峰的归属,证明了共聚物为带有疏水基团的二元共聚物。特性粘数的测定结果表明:分子量M、疏水单体含量[H]增加,特性粘数[η]]增大,Huggins常数KH减少,平均线团密度ρequ减少;但随疏水链嵌段长度NH的增加,[η]增大,KH同样增大。随疏水单体含量[H]、分子量M、疏水链的嵌段长度NH增加,各聚合物溶液临界缔合浓度cac降低,疏水缔合的机率增加。

A series of twin-tailed hydrophobic associating water-soluble copolymers poly （acrylamide/dihexylacrylamide） [ P（AM/DiC8AM） ]were synthesized by micellar copolymerization. The copolymer was characterized by FTIR. It is observed by intrinsic viscosity that with the increasing of molecular weight and hydrophobic monomer content, intrinsic viscosity [η] increased, the equal clew density ρequ and Huggins constant kH descreased. With the increasing of hydrphobe block length, Intrinsic viscosity [η] and Huggins constant kH both increased. The solution critical association density cac of hydrophobic modified P（AM/DiC8 AM） descreased with the increasings of molecular weight, hydrphobe block length and hydrophobic monomer content.