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Petroleum Science 2021年第6期18卷 1760-1775页

作者： Dao-Yi Zhu Zhi-Hua Deng Si-Wei Chen State Key Laboratory of Petroleum Resources and Prospecting and Petroleum School China University of Petroleum-Beijing at KaramayKaramay834000XinjiangChina

polymer gel systems have been widely applied to control excessive water and improve oil recovery(IOR)in petroleum *** are usually divided into two main types,in-situ cross-linked polymer gels,and pre-formed polymer *** recent years,nuclear magnetic resonance(NMR) technology has been gradually applied to the research of polymer gel systems due to its unique analysis *** paper is intent to review these works *** in-situ cross-linked polymer gel systems,NMR can be used to characterize the chemical structure changes of the polymer,the cross-linker,and the auxiliary agent in the formulation of the polymer gel ***,the gelation time and the gel strength of the in-situ cross-linked polymer gel systems can also be measured by *** pre-formed polymer gels,NMR can be employed to detect the chemical structure of the designed ***,the NMR method can evaluate the plugging,water control,and oil improvement performance of the polymer gels in porous media without using *** review can help readers build a more systematic understanding of the application of NMR technology in polymer gel systems for IOR and help re searchers to more deeply study the performance of polymer gel systems.

关键词： Nuclear magnetic resonance polymer gels Gelation time Gel strength Conformance control

SURFACE DYNAMIC FRICTION OF polymer gels

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Chinese Journal of polymer Science 2000年第3期18卷 271-275页

作者： J.P.Gong G.KagatavY.Iwasaki Y.Osada Graduate School of Science Hokkaido University Sapporo 060-0810 JapanGraduate School of Science Hokkaido University Sapporo 060-0810 JapanGraduate School of Science Hokkaido University Sapporo 060-0810 Japan

The sliding friction of various kinds of hydrogels has been studied and it was found that the frictional behaviors ofthe hydrogels do not conform to Amonton's law F=μW which well describes the friction of solids. The frictional force andits dependence on the load are quite different depending on the chemical structures of the gels, surface properties of theopposing substrates, and the measurement condition. The gel friction is explained in terms of interracial interaction, eitherattractive or repulsive, between the polymer chain and the solid surface. According to this model, the friction is ascribed tothe viscous flow of solvent at the interface in the repulsive case. In the attractive case, the force to detach the adsorbing chainfrom the substrate appears as friction. The surface adhesion between glass particles and gels measured by AFM showed agood correlation with the friction, which supported the repulsion-adsorption model proposed by the authors.

关键词： polymer gels Surface dynamic friction Repulsion-adsorption model

Click-Formed polymer gels with Aggregation-Induced Emission and Dual Stimuli-Responsive Behaviors

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Chinese Journal of Chemical Physics 2021年第3期34卷 365-372,I0001-I0008,I0048页

作者： Sheng-yu Shi Guo-ying Zhang CAS Key Laboratory of Soft Matter Chemistry Department of Polymer Science and EngineeringUniversity of Science and Technology of ChinaHefei 230026China

Stimuli-responsive polymer gels have recently attracted great attention due to their heat/solvent resistance,dimensional stability,and unique sensitivity to external *** this work,we synthesized thiol-functionalized tetraphenylethylene(TPE)and constructed polymer gels through thiol-ene click *** synthetic process of the polymer gels could be monitored by fluorescence emission of TPE moieties based on aggregation-induced emission *** addition,due to the dual redox-and acid responsiveness of the polymer gels,in the presence of dithiothreitol and trifluoroacetic acid,fluorescence quenching of the polymer gels can be *** stimuli-responsive characteristics endows the polymer gels with potential applications in fluorescent sensing and imaging,cancer diagnosis and selfhealing materials.

关键词： polymer gels Thiol-ene click reaction Stimuli-responsive Aggregation-induced emission

DEHYDRATION KINETICS OF POLYVINYL ALCOHOL HYDROGEL WOUND DRESSINGS DURING WOUND HEALING PROCESS

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Chinese Journal of polymer Science 2010年第4期28卷 573-580页

作者： Mohammad Sirousazar Mortaza Yari Faculty of Chemical Engineering Urmia University of TechnologyP.O.Box 57166-93187UrmiaIran polymer Engineering Group Faculty of EngineeringTarbiat Modares UniversityP.O.Box 14115-143TehranIran Mechanical Engineering Group Faculty of EngineeringUniversity of Mohaghegh ArdabiliP.O.Box 56199-11367ArdabilIran

The hydrogel wound dressing based on polyvinyl alcohol （PVA） was prepared by the freezing-thawing cyclic method. The dehydration kinetics of prepared hydrogels was determined using the experimental method and mathematical modeling based on diffusion mechanism. The results show that the dehydration rate of PVA hydrogel wound dressing inversely depends on the hydrogel thickness as well as water content of the wound. On the other hand, the initial water content of hydrogel and the atmospheric humidity have little direct effect on the dehydration rate. The good agreement between experimental and mathematical modeling results in early stages of dehydration process shows that the predominate factor determining the dehydration of these wound dressings is diffusion.

关键词： polymer gels Wound dressing Polyvinyl alcohol Dehydration kinetics