Preparation and properties of polyphenylene sulfide/oxidized-polyphenylene sulfide composite membranes

Solar-driven water evaporation using a collaborative photothermal conversion material system based on carbonized waste polyphenylene sulfide and copper sulfide

Recently, water resources have become scarce due to the growing global population and human impact on the environment, coupled with the effects of climate change. For solving the problem of global freshwater shortage and increasing the value of discarded polyphenylene sulfide (PPS) filter bags, in this study, balsa wood was used as the base of a photothermal solar evaporator, chitosan solution was used as the binder, and the main photothermal conversion materials used were polyphenylene sulfide (CP) carbide and copper sulfide. In order to create synergistic photothermal conversion materials, freeze-drying and in situ precipitation were used to deposit the photothermal conversion materials on top of the balsa wood. The prepared CP/CuS-wood evaporator has excellent water evaporation performance and light conversion capability, with a water evaporation rate of 2.68 kg m-2 h-1 and a photothermal conversion efficiency of 93.2% under simulated one solar intensity irradiation. In addition, the evaporator can effectively remove organic dyes such as methylene blue and methyl orange. The evaporator's durability and seawater desalination capability have also been confirmed through seawater desalination experiments and outdoor tests. Studies have shown that solar interface photothermal evaporators are a viable solution for desalination and wastewater treatment. This eco-friendly, economically viable and stable photothermal evaporator mentioned in this paper has pioneering features and will be a new paradigm for desalination and wastewater treatment.

Study on Preparation and Properties of Glass Fibre Fabric Reinforced Polyphenylene Sulphide Composites

In this paper, glass fiber fabric reinforced polyphenylene sulfide composites were prepared by hot pressing. The effects of glass fibre modification and hot pressing temperature on the properties of the composites were investigated using a scanning electron microscope, infrared spectrometer, universal testing machine, and DIGEYE digital imaging colour measurement system. The results show that after the treatment with a silane coupling agent, the silane coupling agent was more uniformly distributed on the surface of the glass fibres, and the bonding effect between the glass fibre fabric and polyphenylene sulphide was significantly improved. The strength of the composites increased and then decreased with the increase of hot pressing temperature, and the surface colour of the composites became darker and darker. When the hot-pressing temperature is 310 °C, the mechanical properties of glass fabric-reinforced polyphenylene sulfide composites are at their best, the tensile strength reaches 51.9 MPa, and the bending strength reaches 78 MPa.

Synthesis of Novel α-Trifluorothioanisole Derivatives Containing Phenylpyridine Moieties with Herbicidal Activity

To discover novel herbicidal compounds with favorable activity, a range of phenylpyridine-moiety-containing α-trifluorothioanisole derivatives were designed, synthesized, and identified via NMR and HRMS. Preliminary screening of greenhouse-based herbicidal activity revealed that compound 5a exhibited >85% inhibitory activity against broadleaf weeds Amaranthus retroflexus, Abutilon theophrasti, and Eclipta prostrate at 37.5 g a.i./hm2, which was slightly superior to that of fomesafen. The current study suggests that compound 5a could be further optimized as an herbicide candidate to control various broadleaf weeds.

Polyphenylene sulfide fabric with enhanced oxidation resistance and hydrophobicity through polybenzoxazine surface coating for emission control in harsh environment

Emissions from power generation and municipal waste incineration sources are primarily at high temperatures and contain corrosive gases, particulate pollutants and are enormously challenging on the performance of the filtration systems in use. Here, polyphenylene sulfide (PPS) nonwoven fabric, a primary material used commercially in such settings, is modified with a polybenzoxazine precursor as a coating to deliver improved thermal and oxidation resistance to the fibrous substrate. The polybenzoxazine precursor undergoes chain propagation and crosslinking upon the treatment process to provide a protective layer over the PPS fibers such that enhanced structural stability in a harsh environment was demonstrated. We have shown the improved overall tensile strength (+15%), Young's modulus (+26%), and more hydrophobic nature of the modified PPS fabric, while the superior environmental stability and better filtration performance could be achieved. Such methodology may lead to higher service temperature and extended service time of the PPS filtration bags in harsh fire exhaustion airstreams encountered in power plants or municipal garbage incineration facilities. The crosslinkable benzoxazine could also be the most cost-effective high temperature coating layer on fibers, enabling future high-performance air filtration materials.

Development and Performance Evaluation of an Intelligent Sand Control Screen Based on Polyphenylene Sulfide

Open hole combined with a sand filter pipe is the main development mode of an unconsolidated sandstone horizontal well, which causes problems such as shaft wall collapse, sand filter pipe blockage, and even damage. At present, the polyurethane intelligent sand control screen pipe can effectively solve these problems, but its application scope is limited by the downhole temperature and material strength. Therefore, the high-strength shape memory polyphenylene sulfide (SMPPPS) was synthesized by an indoor experiment, then the shape memory performance was analyzed, and the variation law of pore size with composition and processing technology was obtained. Finally, the performance of the SMPPPS intelligent screen was evaluated. It is found that (1) with the increase of the cross-linking agent content, the melt index and melt peak temperature of SMPPPS decrease rapidly at first and then remain unchanged; the cross-linking agent content is set at 4.5 wt %. (2) The shape memory performance of SMPPPS is good, and the recovery ratio can reach 99.8% at 110 °C in 11.8 min. (3) The relationship between the pore size distribution proportion of SMPPPS and the foaming agent content, pore enhancer content, temperature, and pressure is determined through experiments; the main distribution range of pore size increases with the increase of the foaming agent content and temperature and decreases with the increase of the pore enhancer content and pressure. When the foaming agent content is 0.5 wt %, the pore enhancer concentration is 10 wt %, the molding temperature is 320 °C, the molding pressure is 10 MPa, and the main distribution range of pore size is 80-320 μm. (4) The permeability of recovery SMPPPS with a compression ratio of 300% first increases slightly and then decreases slightly with the increase of flow, with a variation range of 420.5-463 mD; the compressive strength range is 9.5-11.4 MPa; the SMPPPS has good adaptability to downhole fluid; the sand retaining accuracy is higher than that of the screen sand filter pipe, but the blockage is more serious.