论文部分内容阅读
采用丙烯酰胺(AM)、2-丙烯酰胺基-2-甲基丙磺酸钠(NaAMPS)以及N-叔丁基丙烯酰胺(NtBA)为共聚单体,以Cu~0粉/三(2-二甲氨基乙基)胺(Me_6-TREN)为催化体系,四氯化碳(CCl_4)为引发剂,利用单电子转移自由基聚合(SET-LRP)方法合成星型疏水缔合水溶性聚合物P(AM/NtBA/NaAMPS)。采用控制变量法分别考察了引发温度、疏水单体含量、AMPS含量、引发剂用量、催化剂铜、单体浓度等因素对聚合物相对分子质量的影响,确定了最佳聚合条件并考察了聚合物的耐温抗盐性能。结果表明,当单体浓度为35%,引发温度为25℃,AM、AMPS、NtBA分别占单体总量的93.6%、5%、1.4%(摩尔比),引发剂质量分数为0.4942%,催化剂铜的质量分数为0.0848%,钝化剂的质量分数为0.1192%时,所得星型疏水缔合水溶性聚合物P(AM/NtBA/NaAMPS)的相对分子质量出现最高值为267万,同时具有一定的耐温抗盐性,其溶液性能与线型化的P(AM/NtBA/NaAMPS)相似,且在相同浓度下CaCl_2对聚合物表观粘度的影响比NaCl大。
(AM), sodium 2-acrylamido-2-methylpropane sulfonate (NaAMPS) and NtBA were used as comonomers. Dimethylaminoethyl) amine (Me_6-TREN) as catalytic system and carbon tetrachloride (CCl_4) as initiator to synthesize the star-shaped hydrophobically associating water-soluble polymer by the single electron transfer radical polymerization P (AM / NtBA / NaAMPS). The effects of temperature, hydrophobic monomer content, AMPS content, initiator amount, copper catalyst, and monomer concentration on the molecular weight of the polymer were investigated by the controlled variable method. The optimum polymerization conditions were determined and the effects of polymer The temperature and salt resistance. The results showed that AM, AMPS and NtBA accounted for 93.6%, 5% and 1.4% of the total monomers, respectively, and the initiator mass fraction was 0.4942% when the monomer concentration was 35% and the initiation temperature was 25 ℃. The highest relative molecular mass of star-shaped hydrophobic associative water-soluble polymer P (AM / NtBA / NaAMPS) was 2.67 million when the mass fraction of copper catalyst was 0.0848% and the mass fraction of passivating agent was 0.1192% Has certain temperature and salt resistance, and its solution performance is similar to that of linearized P (AM / NtBA / NaAMPS). CaCl2 has a greater effect on the apparent viscosity of the polymer than NaCl at the same concentration.