四元共聚疏水缔合物HPAE的制备及流变性能

Preparation and Rheological Properties of New Quaternary Copolymers of Hydrophobic Association

以亲水性的丙烯酰胺（AM）、丙烯酸（AA）为主链单体,通过引入一种新型具有两亲结构的非离子疏水单体EDP-10,与功能性抗盐单体2-丙烯酰胺基-2-甲基丙磺酸（AMPS）进行水溶液聚合,制备了一种新型疏水缔合四元共聚物HPAE。确定了最佳合成条件：EDP-10的加量为1.2wt%,采用过硫酸铵/亚硫酸氢钠/水溶性偶氮复合引发体系进行引发,引发剂质量分数（占单体总量）为0.03wt%,p H为7.0~7.5,引发温度为5℃。对疏水单体EDP-10及HPAE进行了红外表征,并对HPAE进行了流变性能评价。黏弹性测试结果表明HPAE具有较好的增稠性能,其溶液存在较强的网络结构,由于缔合原因形成的结构强度所承受的应力范围及频率范围也随着浓度的增大而明显增强,触变性测试结果表明HPAE具有明显的触变性。

A new hydrophobic associating copolymer HPAE was obtained by using nonionic hydrophobic monomer EDP-10,hydrophilic monomer acrylamide（ AM） and acrylic acid（ AA） as main chain,and functional salt monomer2-Acrylanmido-2-methylpro panesulfonic acid（ AMPS） with solution polymerization method. The optimal synthesis conditions were determined to be as follows： the mass fraction of EDP-10 is 1. 2wt%,using a complex initiation system which contains ammonium persulfate / ascorbic acid / water-soluble azo. The initiator mass fraction（ based on the monomers） is 0. 03wt%,p H is 7. 0 ~ 7. 5 and trigger temperature is 5 ℃. The hydrophobic monomer EDP-10 and HPAE were characterized by infrared spectrum and the rheological properties of HPAE solution was evaluated. The viscoelasticity test results showed that HPAE had better thickening properties,there is strong network structure in the HPAE solution. The strength of network structure caused by association reaction also increased with the increase of HPAE solution. Thixotropy test results showed that HPAE solution has obvious thixotropy.