Abstract:
Objective This study is aiming to explore how the different functional monomers affect the temperature resistance performance of partially hydrolyzed polyacrylamide.
Methods Three kinds of partially hydrolyzed polyacrylamide modified by different functional monomers were designed. The stretching degree of polymer molecular chains, the diffusion state of small molecules and the strength of hydrogen bonds between polymer with water were investigated at high temperature by molecular dynamics simulation.
Results The anionic monomer AMPS restrained polymer chain"dehydration"and improved its temperature resistance performance, on account of AMPS having a sulfoacid group, and it can promote the formation of stronger hydrogen bonds between polymer chain and water. Since the nonionic monomer NVP has a rigidly ring-shaped structure, it can improve polymer chain curl resistance property and avert its excessive curl, and enhance the temperature resistance performance of the polymer. In addition, the cationic monomer DADMAC is easy to attract the carboxylate group, which causes the polymer chain to curl more easily and reduces its temperature resistance.
Conclusions The groups that can both form stronger hydrogen bond strength with water and the ring-shaped monomers with curl resistance ability are more conducive to improving temperature resistance of partially hydrolyzed polyacrylamide.
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