Deng Bo,Luo Xueqin,Jiang Feng,Liu Wei,Gu Jianwei,Liu Chao,Song Yanan
In the petroleum industry, water-soluble polymers can be used as oil displacement agents. However, the use of water-soluble polymers is limited because of poor temperature and salt resistance. To improve temperature and salt resistance, a weakly cationic polymer with large side groups (PAM/AMPS/VI) was prepared by copolymerizing acrylamide (AM) with 2-acrylamido-2-methylpropane sulfonic acid (AMPS) and 1-vinylimidazole (VI). The viscosity of PAM/AMPS/VI water solutions can be increased more than 20 mPa·s compared with PAM/AMPS. In addition, the viscosity of the solution increased continuously after aging at 80 °C, showing good temperature and salt stability. The protonated tertiary amine in the imidazole ring electrostatically interacts with the sulfonic group, increasing the viscosity and salt resistance of the polymer. The five-membered ring of imidazole also enhances the rigidity of the polymer chain and improves the temperature tolerance. As a confirm of the result, a complete spatial network of PAM/AMPS/VI was observed in scanning electron microscopy (SEM) micrographs. Using weak cationic polymers with large side groups can provide a reference for the design of new temperature tolerance and salt resistant polymer.
Xiaorong Dou,Zheqi Chen,Fuhao Ren,Lijun He,Jianxiong Chen,Li-Juan Yin,Yingwu Luo,Zhi-Min Dang,Jie Mao
Dielectric elastomer actuators (DEAs) face an acknowledged challenge: On the one hand, the majority of elastomers only achieve small electroactive deformation (<20%) in the absence of prestretch; on the other hand, rare elastomers capable of showing large electroactive deformation require relatively complicated processing and chemistry. This work addresses this challenge by fabricating an elastomer with a network of large side groups, which achieves a very large electroactive deformation (218%) without pre-stretch. This elastomer can be rapidly and massively fabricated within a few min, by polymerizing a commercial monomer with a large alkyl side group. The large side groups in the polymer network repel each other and extend the load-bearing strands, which results in a pronounced strain-hardening behavior. This behavior helps the elastomer to get rid of electromechanical instability during actuation and hence to exhibit a large electro-active deformation, a high energy density (>> human muscle), and a large output force (≈500 times self-weight). the elastomer capable of manufacturing a soft electroactive gripper is demonstrated with large deformation, large force, and rapid response, which enables grasping fragile objects of various complex shapes in an agile away.
危险品化学品经营许可证（带存储）