A Novel Thermothickening Aqueous System Prepared from Hydrophobically-Modified Acrylamide Copolymer,Poly(N-isopropylacryl-amide) and Sodium Dodecyl Benzene Sulfonate and Its Mechanism Studies |
| |
Authors: | Liehui Zhang Ming Duan Shenwen Fang Jiang Zhang |
| |
Institution: | 1. State Key Laboratory of Oil/Gas Reservoir Geology and Exploitation , Southwest Petroleum University , Chengdu, Sichuan, 610500, China;2. Beijing Research Center of China National Offshore Oil Corporation , Beijing, 100027, China |
| |
Abstract: | A new thermothickening aqueous system was presented based on mixtures of hydrophobically-modified acrylamide copolymer (HMPAM), poly(N-isopropylacryl-amide) (PNIPAM) and sodium dodecyl benzene sulfonate (SDBS). Unique in the thermothickening system, a maximum viscosity and the temperature (T max) when reaching such viscocity change independently, reflects the presence of intermolecular interactions. The T max of the new system suggests that its thermothickening behavior is correlated to the cloud point temperature (T c) of PNIPAM, which can be easily adjusted to desired values by the addition of SDBS. The experimental data also indicate that the temperature between the rheological transition temperature (T t) and T max in HMPAM+PNIPAM+SDBS is within the range of 35–65°C, and the thermothickening behavior originates from the reinforcement of the association network between HMPAM, PNIPAM and SDBS. Consequently, the viscosity over the corresponding thermosensitive range upon cooling is higher than that upon heating. |
| |
Keywords: | hydrophobically modified acrylamide copolymer poly(N-isopropylacryl-amide) sodium dodecyl benzene sulfonate viscosity water-soluble polymers |
|
|