MSN@U based on urushiol with catechol groups possessed rapid hemostatic performance because they self-assembled into a Janus membrane at the interface.

Janus hybrid particles (MPS-SiO2@PDVB-DM, JPs) were successively fabricated by grafting dodecyl mercaptan (DM) onto polydivinylbenzene (PDVB) lobe and 3-(trimethoxysilyl)­propyl methacrylate (MPS) chains onto SiO2 lobe in the case of SiO2@PDVB Janus particles as the template. Moreover, MPS-SiO2@PDVB-DM Janus particles were used as the compatibilizer of immiscible polymer blends of liquid isoprene rubber (LIR) and epoxy resin (ER). The modified Janus particles were embedded in the interface of LIR and ER, which could improve the compatibility of LIR and ER, mitigating the macrophase separation in the blends. Besides, the compatibilizing effect of MPS-SiO2@PDVB-DM depends not only on the Janus molecular structure but also on the blending process and the curing agent of ER.

In recent years, the using of reproducible resource and economical and efficient synthesis method has got wide concern. Herein, an environmental-friendly plasticizer originated from cardanol was synthesized by click chemistry. First, the cardanol sulfide (CS) was obtained by click chemistry reaction between the double bond of the side chain of cardanol and mercaptoethanol. The degree of the click reaction was estimated to reach 84.7% by testing the content of sulfur. Then, the epoxidation of the hydroxyl was performed to get cardanol based epoxy plasticizer (CEP) in the presence of epichlorohydrin. The epoxy value was 0.32. The structure of CS and CEP was confirmed by FT-IR and NMR techniques. A Haake torque rheometer was used to research the action of CEP on polyvinyl chloride (PVC). Results showed that it possessed favorable plasticization effect and stabilization effect on PVC. CEP had good heat stabilization in PVC, and could decrease the T g of PVC significantly. Moreover, CEP could increase the tensile strength of PVC when in a small amount, and could increase the plasticity of PVC when in a larger quantity significantly. The characteristics of volatile, migration and solvent extraction of PVC plasticized by CEP is similar to by dioctyl phthalate (DOP). V C 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 44890.

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After polymer flooding in Daqing Oil Field, the injection pressure in the flooded areas has increased. The injection pressure of one third of the polymer-injection wells is near to its fracturing pressure, and many polymer injection wells have to lower its injection rate. Since the effective period of fracturing in polymer injection wells is less than 3 months, a new polymer injection well stimulation technology was in great need to be developed. The system does not need alkali, and under formation conditions, the interfacial tension remains ultra-low for at least 28 days. A series of lab tests shows that to first remove the polymer adsorbed on the rock, a slug containing an oxidant needs to be injected before the surfactant slug. The surfactant slug lowers the residual oil concentration, increases the relative permeability to water and adsorbs on the rock near the well bore, preventing polymer to adsorb on the rock in the subsequent stage of polymer flooding. Lab tests shows that adopting a flooding process of subsequently injecting an oxidant slug, then a surfactant slug and last followed by polymer flooding obtains the best results (the permeability to polymer fluid is increased about 120%). Introduction At present, the starting pressure (e.g., the pressure at which water starts to be injected into the well) of polymer-injection wells is commonly high and injection rate is relative insufficient in Daqing Oil Field. The high starting pressure and injection pressure of the polymer injection wells greatly influence the development results of the oil field, these are mainly reflected in the following aspects:The starting pressure is too high so that an effective pressure differential cannot be set up between production and injection wells, resulting in poor developing result.The high injection pressure causes an increase in the number of casing damage wells.The injection pressure is too high; therefore the injection solution cannot advance evenly into the wells.In order to maintain the injection rate of medium and low permeability layers developed by polymer flooding, the well spacing needs to be reduced and the development cost is increased. Therefore, it is very important to study technology that can effectively reduce the starting pressure and injection pressure of polymer-injection wells.