阴离子疏水单体改性的P(AM-co-DMC)的合成及絮凝性能

Synthesis and Flocculent Performance of Anionic Hydrophobic Monomer Modified P(AM-co-DMC)

在少量阴离子疏水单体4-(ω-丙烯酰氧乙氧基)苯甲酸(PEBA)的参与下,合成了丙烯酰胺(AM)-丙烯酰氧乙基三甲基氯化铵(DMC)共聚物。通过表观黏度及芘探针发射谱测定了疏水改性P(AM-co-DMC)溶液的临界缔合浓度(CAC)。透射电镜观察表明:在水溶液中,当疏水改性P(AM-co-DMC)浓度高于CAC时,因静电及疏水作用可形成微球状缔合体。对高岭土悬浮液的絮凝表明,与普通P(AM-co-DMC)共聚物相比,疏水改性P(AM-co-DMC)具有较好的絮凝能力及较宽的窗体用量。pH对絮凝效果的影响表明,除疏水作用外,高分子链间的静电作用是提高絮凝效果的另一原因。

Acrylamide（AM） and（2-methacryloyloxyethyl）trimethyl ammonium chloride（DMC） copolymer with a small amount of 4-（ω-propenoyloxyethoxy） benzoic acid（PEBA） was synthesized.Apparent critical interpolymer aggregate concentration（CAC） was determined by the measurement of the solution apparent viscosity and using pyrene emission fluorescence spectrascopy.In aqueous solution,when the concentration was above the CAC,due to the hydrophobic and electrostatic interactions,the hydrophobically modified P（AM-co-DMC） could form microparticles aggregates according to TEM image.Compared with commonly P（AM-co-DMC）,the hydrophobically modified P（AM-co-DMC） exhibit better performance and has broader flocculation window for kaolin suspension.Effects of pH value on the flocculation（indicate） that the electrostatic interaction among copolymer chains is another reason to improve the flocculation performance besides hydrophobic interaction.