Abstract
Hydrophobic associative water-soluble polymers (HAWSP) are widely used as thickening agents for fracturing fluids due to their excellent viscoelastic properties. However, the HAWSP products synthesized by conventional methods are generally poor in resisting higher temperatures. In order to solve this problem, the effects of molecular weight and amount of hydrophobic monomer on the rheological properties of hydrophobic were investigated carefully. The macromolecular chain transfer agent was prepared through the process of reversible addition–fragmentation chain transfer polymerization (RAFT)/macromolecular designed by the interchange of xanthates (MADIX), and then the terpolymer of AM-co-AA-co-N-(3-methacrylamidopropyl)-N,N-dimethyldodecan-1-aminium (MAO-12DMA) was synthesized. The polymer has a narrow molecular-weight distribution giving rise to a good solubility even when the molecular-weight and the content of hydrophobic monomer are relatively high. Our study shows that the increase of molecular-weight...
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