•TFPP and FPP as new stationary phases for capillary GC.•High selectivity for analytes of different properties.•Excellent thermal stability.•Great potential for practical applications.In this work, two new types of polycyclic aromatic grafted polysiloxanes, namely, 3,4-bis(4-fluoro phenyl)-2,5-diphenyl polysiloxane (FPP) and 3,4-bis(3,4,5-trifluoro phenyl)-2,5-diphenyl polysiloxane (TFPP), were synthesized and statically coated onto capillary columns as stationary phases for gas chromatography (GC). Based on their McReynolds constants, both columns exhibited moderate polarity. The efficiencies of the FPP and TFPP columns were 3316 (k = 3.96, naphthalene; 0.25 mm inner diameter) and 3768 (k = 4.14, naphthalene; 0.25 mm inner diameter) plates/m, respectively. The thermostability of the polymers was tested by thermogravimetric analysis (TGA), and results revealed that both TFPP and FPP began to decompose slightly at 380 °C. Separation of polyethylene pyrolysis products showed that the upper working temperature of the two columns can reach up to 360 °C. Relying on their unique polarizable characteristics in combination with other types of interactions, such as H-bond acceptor, dipole-dipole, and dispersive interactions, the newly synthesized polarizable stationary phases offered unique selectivity for aromatic isomers and substituted benzenes. A slight separation difference between TPP and TFPP was observed. TFPP also exerted excellent selectivity for polycyclic aromatic hydrocarbons, fatty acid esters, and fatty alcohols. Overall, FPP and TFPP demonstrated considerable potential for further applications because of their unique structures and outstanding separation performance.

•DPFP as a new stationary phase for capillary GC.•High selectivity for analytes of different properties.•Excellent thermal stability.•Great potential for practical applications.A novel 7,10-diphenylfluoranthene grafted polysiloxane (DPFP) was synthesized and statically coated on a fused-silica capillary column. High column efficiency (3864 plates per m) was achieved for naphthalene at 120 °C. Thermo-gravimetric analysis showed that the DPFP polymer began to decompose at 380 °C. The chromatogram of polyethylene pyrolysis products indicated that the maximum allowable temperature of the DPFP column could reach 360 °C. By relying on its specific π-π stacking and dipole-induced dipole interactions with aromatic solutes, the DPFP stationary phase achieved excellent resolution for substituted benzene and aromatic hydrocarbons with satisfactory peak shapes, as well as showed superiority to current stationary phases that failed to resolve some critical pairs. Moreover, DPFP also showed good selectivity and resolving ability for Grob test mixtures, fatty acid esters, and ethers.

3,4-Di(4-methoxy phenyl)-2,5-diphenyl phenyl grafted polysiloxane (MTP) and 3,4-di(3,4,5-trimethoxy phenyl)-2,5-diphenyl phenyl grafted polysiloxane (TMP) were synthesized and statically coated on fused silica capillary columns. The MTP and TMP columns have efficiencies of almost 3400 (k = 3.74, 0.25 mm i.d.) and 3600 (k = 3.96, 0.25 mm i.d.) plates per m, respectively, which are determined by naphthalene at 120 °C. Both columns exhibited moderate polarity based on the McReynolds constants. The separation of the polyethylene pyrolysis products shows that the maximum operating temperature of the two columns can reach up to 360 °C and 370 °C, respectively. In addition, the solvation parameter indicated that the dipole–induced dipole, H-bond alkaline, and dispersive interactions were the main interactions between the solutes and the stationary phases. The separation performance of the new columns was evaluated by gas chromatography separation of the Grob test mixtures. Several mixtures with π-conjugated structure were also well separated on the new columns. This work demonstrated the promising future of the new type of stationary phases in GC analysis.

An alternate copolymer (P(BPTMC)-alt-ODMS) constructed from N,N′-bis(diphenyl-silyl) tetramethylcyclodisilazane (BPTMC) and oligo-dimethylsiloxane (ODMS) segments was synthesized and coated on the inside of fused-silica capillary columns to evaluate their properties as stationary phase in gas chromatography. The thermal stability, selectivity, column efficiency, and working range of these capillary columns were characterized. The obtained results indicated that such produced columns exhibited better separation efficiency than commercial ones with high thermal stability and low column bleeding. The upper working temperature can reach up to 400 °C, which resulted in high-quality GC analysis of polyethylene pyrolysis products, petroleum, and aromatic hydrocarbon mixtures. The influence of BPTMC content on the thermal stability and polarity of the stationary phase was also investigated.

A new type of copolymer diphenyl–phenyl polysiloxane (DPPP) was synthesized and coated inside the fused-silica capillary columns, which were used as a novel stationary phase in gas chromatography (GC). The thermal stability, selectivity, polarity, column efficiency, and maximum allowable temperature for these capillary columns were characterized, and the results indicated that the prepared columns exhibited higher column efficiency (3560 plates per m compared to 3630 plates per m). The excellent film-forming capability on the inner surface of fused-silica capillary columns was proved by the analysis of Grob test compounds. The maximum allowable temperature was determined to be 360 °C, which indicated that the copolymer was highly suitable for high-temperature separation. In addition, superior peak shapes were observed when a DPPP column was used to separate a substituted mixture of benzene and polycyclic aromatic hydrocarbons, which suggests its great potential for application in GC analyses.

In this work, a new polycyclic phenyl grafted polysiloxane called DFP-15 (15.1% 3,4-2(trifluoromethyl phenyl)-2,5-diphenyl phenyl) was synthesized by the Diels–Alder reaction of tetraphenyl cyclopentadienone monomer containing trifluoromethyl groups with methyl vinyl polysiloxanes composed of 18% methyl vinyl and 82% dimethyl groups. A second chemical called DFP-8 was also prepared for comparison purposes. The thermal stability was evaluated by thermogravimetric analysis, and the results revealed that both of the DFPs had similar thermal stability, and they began to decompose slightly at 380 °C. Subsequently, the copolymers were coated on fused silica capillary columns by static coating and used as a stationary phase and were characterized. The column efficiencies of the DFP-15 and DFP-8 columns were 3960 plates per m (k = 1.90, naphthalene) and 3740 plates per m (k = 1.74, naphthalene), respectively. The excellent film-forming ability in the inner surface of the fused silica capillary columns was proven by the analysis of Grob reagent. Furthermore, the selectivity of the novel stationary phases for analytes, including substituted benzene isomers and polycyclic aromatic hydrocarbons, was evaluated. This work suggests that both of the stationary phases have great potential for further development and application.

Wormlike micelles, obtained in anionic surfactant sodium oleate (NaOA) solutions in the presence of sodium phosphate (Na3PO4), were studied using the steady and dynamic rheological methods. The laboratory simulation flooding experiments were used to investigate the effects of flooding for the wormlike micelles system. The results show that the oil recovery is 32.7%. This flooding system is a new type and has high activity with a low cost.

In this work, a new polycyclic phenyl grafted polysiloxane called DFP-15 (15.1% 3,4-2(trifluoromethyl phenyl)-2,5-diphenyl phenyl) was synthesized by the Diels–Alder reaction of tetraphenyl cyclopentadienone monomer containing trifluoromethyl groups with methyl vinyl polysiloxanes composed of 18% methyl vinyl and 82% dimethyl groups. A second chemical called DFP-8 was also prepared for comparison purposes. The thermal stability was evaluated by thermogravimetric analysis, and the results revealed that both of the DFPs had similar thermal stability, and they began to decompose slightly at 380 °C. Subsequently, the copolymers were coated on fused silica capillary columns by static coating and used as a stationary phase and were characterized. The column efficiencies of the DFP-15 and DFP-8 columns were 3960 plates per m (k = 1.90, naphthalene) and 3740 plates per m (k = 1.74, naphthalene), respectively. The excellent film-forming ability in the inner surface of the fused silica capillary columns was proven by the analysis of Grob reagent. Furthermore, the selectivity of the novel stationary phases for analytes, including substituted benzene isomers and polycyclic aromatic hydrocarbons, was evaluated. This work suggests that both of the stationary phases have great potential for further development and application.