This article describes an efficient synthetic route of defined reactive polyester-block-polycarbonate copolymers, utilizing a bifunctional SalenCoNO 3 complex as catalyst for the single-step terpolymerization of norbornene anhydride (NA), propylene oxide, and carbon dioxide. The geometric isomer of NA plays an important role in polymerization efficacy and the resulting polymer microstructure, including carbonate content, sequence isomer of polycarbonate moiety, and molecular weight. A hydroxyl-functionalized polyester-polycarbonate block copolymer was synthesized by a thiol-ene reaction.

Heterogeneity is a significant feature of many mature oilfields after polymer flooding, which presents great challenges for further enhanced oil recovery (EOR). The displacing fluid after polymer flooding should have the dual effects of improving the swept volume and increasing oil displacement efficiency. At present, alkali−surfactant−polymer (ASP) flooding is an important approach for further EOR after polymer flooding in the Daqing Oilfield. Preformed particle gel (PPG) is a new type of chemical agent with a powerful ability to deform and pass through the pore throat. Here, a series of experiments were carried out to investigate the profile control of PPG/ASP mixed solutions in heterogeneous reservoirs. The results show that, with respect to profile adjustment and EOR after polymer flooding, PPG/ASP mixed solutions are better than ASP-only solutions. Regarding PPG/ASP mixed solutions, PPG and hydrolyzed polyacrylamide (HPAM) could block the reservoir preferential fluid flow pathways via their properties of easy deformation and high viscosity in order to achieve the purpose of improving the swept volume; at the same time, Na 2 CO 3 and petroleum sulfonate could reduce oil−water interfacial tension so as to increase oil displacement efficiency. Besides, compared with ASP-only solutions, PPG/ASP mixed solutions have greater resistance and residual resistance coefficients, higher viscosity, and better flow control stability. Oil recovery enhanced by using PPG/ASP mixed solutions after polymer flooding boasts 3.4% more original oil in place (OOIP) when compared to ASP-only solutions, and the consumption of chemical agents is reduced by 15.8%. Furthermore, the proportion and characteristics of microscopic residual oil distribution after different flooding systems were investigated. The results are consistent with the core flooding experiment and confirm that when combined, PPG and ASP have a synergistic effect on profile control after polymer flooding in heterogeneous reservoirs.

The DCD-MIPs displayed good adsorption properties to DCD, which can be applied to the separation and detection of DCD.

Chloramphenicol was chosen as the imprinting molecule and the methacrylic acid was chosen as the functional monomer to prepare molecularly imprinted polymers. Ethylene glycol dimethacrylate, pentaerythritol triacrylate, and trimethylolpropane trimethylacrylate were used as the cross‐linking agents, respectively. The interaction processes between chloramphenicol and methacrylic acid were simulated by using the ωB97XD/6‐31G (d,p) method. The self‐assembled configuration, bonding sites, binding number, binding energy, and interaction principle of stable complex formed by chloramphenicol and methacrylic acid with different molar ratios have been studied. The selectivity of the most stable complex formed from chloramphenicol and methacrylic acid was discussed with the thiamphenicol and florfenicol as the analogues of chloramphenicol. The results showed that chloramphenicol and methacrylic acid were interacted through the hydrogen bonds. When the molar ratio was 1:10 and pentaerythritol triacrylate as the cross‐linking agent, the ordered complex formed by chloramphenicol and methacrylic acid has the largest amount of hydrogen bonds and the lowest binding energy. Scatchard analysis showed that the maximum apparent adsorption capacity was 173.3 mg/g (0.536 mol/g), and the selection factor of florfenicol was the largest. This study provides a reliable theoretical and experimental basis for the design, preparation, and characterization of chloramphenicol molecularly imprinted polymers.

Permeable pavement (PP) can be used to decrease urban surface runoff. However, few studies have been conducted to explore the runoff reduction effect of various structures of PP in the carriageway. In this study, several structures of PP used in the carriageway of sponge cities in China were investigated and divided into three types: surface drainage, base course storage and drainage, and fully permeable. Then, the runoff models were developed by Storm Water Management Model to simulate the effect of the three types under various rainfall recurrence periods. Results show that rainfall recurrence period, structure and thickness of the permeable layer were identified as the most influential factors in PP runoff reduction. The surface drainage can reduce total runoff depth and coefficient by more than 14%, and also delay runoff start time and duration by more than 40 minutes. Surface runoff in the base course storage and drainage can only be generated when recurrence period is 50 years. The fully permeable does not generate any runoff under all recurrence periods. Based on simulation results, a series of runoff coefficient values for PP were recommended to help the design and implementation of PP in mitigating urban waterlogging problems.