Novel fluorinated copolyimide/amine‐modified sepia eumelanin (ASE) nanocomposites are successfully fabricated via covalent bonds. To achieve this, the polyimide (PI) is synthesized by random co‐polycondensation. The effects of ASE on the structure and properties of the PI are investigated. A multilinked network is formed with ASE acting junctions in the nanocomposites. The mechanical properties of the PI are significantly improved by the addition of ASE, and the optimal tensile strength and elongation at break are 79.7 MPa and 85.42%, respectively. UV–vis transmittance, methylene blue (MB) photodegradation, and recyclability measurements confirm that the PI/ASE nanocomposites are transparent to visible light at low ASE loadings and show outstanding UV‐shielding properties and lifetimes under intense UV irradiation owing to the synergistic absorption of UV light by the PI matrix and ASE. Furthermore, the PI/ASE nanocomposites have enhanced thermal properties with initial degradation temperatures above 500 °C. These properties endow the nanocomposites with great potential for UV‐shielding in the conditions with high temperature and intense ultraviolet light.

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A series of novel hyperbranched poly(urethane–imide)s (HBPUIs) was synthesized and derived from as-prepared imide-containing glycol and commercial materials via an A2 + B2 + B3 approach. The chemical and morphological structures of the resulting polymers were evaluated by infrared attenuated total reflection and X-ray diffraction techniques, respectively. Compared with pure HBPU, HBPUIs exhibited better thermal stability with the 10% weight loss temperature of 282–298°C under nitrogen atmosphere, good mechanical property with the tensile strength of 2–19 MPa, and elongation at breaks of 461–896%. Moreover, optical transmissivity of all films was measured and the results showed that they had excellent transparency in the scope of visible light. Meanwhile, the cutoff wavelengths of as-prepared HBPUI films were at around 350 nm, which can block the whole ultraviolet (UV)-C (200–280 nm) and UV-B (280–320 nm), as well as a part of UV-A (320–400 nm). Furthermore, the designed photocatalytic degradation experiment of the methylene blue (MB) confirmed that HBPUI films had good UV-shielding performance with 70% degradation of MB after intense UV irradiation (400 W) for 50 min under the protection of HBPUI film with 14% imide-containing glycol. This endowed HBPUIs with potential applications prospect in UV-shielding materials.

Anti-agglomerant (AA) has emerged over the last decade as a new technology foroffshore hydrate control thanks to its unique hydrate control mechanism andlower application dosage. However, field operational issues, such asfluids separation, water quality and corrosivity in the presence of protic solvents, have prevented the growth of this technology industry-wide as a reliable andefficient hydrate control alternative to methanol and monoethyleneglycol. In this paper, we are reporting a new AA product formulated with anewly-developed proprietary chemistry. The product has been tested under fieldimplementation conditions in hydrate control performance (dose rate, salinity, water cuts and types of hydrocarbon), fluids emulsions and water quality, and corrosiontendency (on both SS304 and SS316). A new method using gas chromatography withflame ionization detector (GC/FID) and gas chromatography withNitrogen/Phosphorus Sensitive Detection (GC/PND) has been developed to quantifyAA partitioning and distribution in the fluids (hydrocarbon and water phases). The relationship between fluids quality and AA actives partitioning in bothaqueous and hydrocarbon phases has also been established to elucidate why the new AAprovides much improved fluids separation and water quality. It also confirmsthe observations made through bottle shaking testing. Under severe lab testing conditions where quaternary ammonium chemistries showcorrosion and pitting on both SS340L and SS316L, the new AA product offerssatisfying material compatibility, although it has the same solvent packageas existing commercial AAs. Comparison of toxicological properties with differentAA chemistries has also been conducted. Under the CEFAS testing protocol, the new AA chemistry presents improvedenvironmental properties over conventional AA chemistries. Introduction Over the last two decades, low dosage hydrate inhibitor (LDHI) has evolved asan alternative method for hydrate control in field applications to provide flowassurance in oil and gas production and transportation systems.1, 2, 3 A widerange of OPEX savings, possible extended field lifetime, and dramatic CAPEXsavings are the ultimate economic drivers for its field implementations.4, 5, 6Based on its hydrate mitigating mechanism, LDHI is divided into two maincategories, kinetic inhibitors (KHI) and anti-agglomerants (AA). The earlier versions of AA technology used in the field are quaternary ammoniumchemistries, with the counter ion normally being chloride.1 Years of fieldimplementation show operation challenges in both fluids separation and waterquality topsides, even though hydrate control performance meets most of therequirements when brine salinity and water cut do not run into therestrictions. Recently, it was also reported that this kind of quat chemistrywas also corrosive, pitting super duplex umbilicals (SDSS2507) and stainless steel storage tanks (SS316L) likelydue to the presence of chloride ions.7 Moreover, the current quat chemistry istoxic, which makes it extremely challenging to meet different HS&Eregulations worldwide. Similar chemistries have rendered a few alternatives over the lastfew years. However, not much improvement has been shown in fluids separationand EcoTox properties. Challenges of quaternary ammonium chemistry are:Poor water quality and treatment difficulty, especially when brine salinityis lowCorrosion due to the large amount of Cl- presentLow thermal stability due to Hoffmann elimination, resulting in limiteddownhole injectionToxicity, poor biodegradation and bioaccumulation.

Toluene diisocyanate(TDI), polyethylene glycol(PEG), double-propionic acid(DMPA), hydroxyethyl methacrylate(HEMA) and other raw materials were used to synthesis UV-curable waterborne polyurethane, and the effect of the synthesis condition on the particle size of the emulsion was investigated in this paper. The structure of the polyurethane was identified by infrared spectroscopy (IR), thermal decomposition properties was measured through the thermogravimetric(TG). The results showed that, the target product is expected waterborne UV polyurethane by IR. With DMPA content increasing, the particle size decrease, stability and appearance of the emulsion turn better. With the mole ration of PEG/DMPA decreasing, adhesion and water absorption of the film increase. TG analysis indicates that the thermal decomposition performance of the Waterborne UV Polyurethane （WPUA） is excellent.