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- Title
β-环糊精对两亲聚合物黏度与分子量测定的影响.
- Authors
沈静静; 刘德新; Bauyrzhan, SARSENBEKULY; 徐德荣; 刘同敬; 杨红斌; 康万利
- Abstract
In order to explore the effect of cladding β-cyclodextrin (β-CD) on the viscosity and viscosity-average molecular weight of amphiphilic polymers, such as acrylamide, acrylic acid, cetyl allylammonium chloride terpolymer (APC16), the viscosity variation law and influencing factors of β-CD cladding APC16 solution were studied by rheometer. The characteristic viscosity of APC16 inclusion system was determined by Urkovinometer, and then the viscosity-average molecular weight of APC16 without intermolecular interaction was accurately calculated. The results showed that under the condition of 45 ℃ and 30 g/L salinity, the critical association concentration of APC16 solution shifted to 5300 mg/L when the molar ratio of β-CD and APC16 was 1∶2. When the molar ratio of β-CD and APC16 was 1∶1 (complete inclusion ratio), the critical association behavior of APC16 solution disappeared. Under the complete inclusion ratio, the viscous flow activation energy of the cladding system was smaller than that of APC16 solution when the temperature increased from 25 ℃ to 90 ℃. The viscosity of the cladding system decreased more gently with the increase of NaCl concentration, while the cladding strength increased. Accordingly, the viscosity-average molecular weight of amphiphilic polymers could be determined by the β-CD inclusion method based on host-guest interaction. The viscosity-average molecular weight of APC16was 537×104 Da, while that of HPAM was 1292×104 Da. When the molar ratio of β-CD and APC16 was 1∶1 and 2∶1, the viscosity-average molecular weight of APC16 was 341×104 Da and 358×104 Da, respectively. When the molar ratio of β-CD and HPAM was 1∶1 and 2∶1, the viscosity-average molecular weight of HPAM was 1223×104 Da and 1272× 104 Da, respectively. The viscosity-average molecular weight of HPAM was consistent before and after inclusion. The effectiveness of the legal determination of molecular weight of amphiphilic polymers by the β-CD inclusion method was confirmed. A new method was provided for the contribution of hydrophobic action of amphiphilic polymers to viscosity and molecular weight determination.
- Publication
Oilfield Chemistry, 2024, Vol 41, Issue 1, p131
- ISSN
1000-4092
- Publication type
Article
- DOI
10.19346/j.cnki.1000-4092.2024.01.018