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Dynamic behavior of polymer surface and the time dependence of contact angle

science china {2. 2005年第6期48卷 553-559页

作者： wang xinping1, chen zhifang1 & shen zhiquan2.1. key laboratory of advanced textile materials and manufacturing technology of education ministry,{2., zhejiang Institute of science and technology, hangzhou 310033, china 2. department of Polymer science and Engineering, zhejiang University, hangzhou 31002., china 1. department of applied chemistry Zhejiang Institute of Science and Technology Key Laboratory of Advanced Textile Materials and Manufacturing Technology of Education Ministry 310033 Hangzhou China 2. department of Polymer science and Engineering Zhejiang University 310027 Hangzhou China

Time-dependent contact angles were measured by depositing sessile drops of wa-ter on the polymer surfaces and monitoring the drop shape as a function of time. It was found that contact angles decreased sharply with contact time and the equilibrium contact angle was finally attained after a certain time. Values of starting (θ s) and equilibrium contact angles (θ e) obtained by the sessile drop method depend on polymer properties. The Wilhelmy plate technique was used to measure advancing and receding contact angles. The variations of starting (θ s) and equilibrium contact angles (θ e), advancing (θ a) and receding contact angles (θ r) have been studied on the oxidized surface of polymers containing polybutadiene block to explore the cause of time-dependence in contact angle measurement and the meaning of θ s and θ e. The results showed the linear relationships between starting (θ s) and advancing contact angles (θ a), the equilibrium (θ e) and receding contact angles (θ r). The similar relationship was also established between the contact angle hysteresis (θ a?θ r) and differences (θ s ?θ e) in starting contact angles and equilibrium contact angles. Therefore, time-dependence in contact angle measurement was mainly attributed to the surface reconstruction when water drops were deposited on polymer surfaces. The starting contact angle was contributed by the hydrophobic component on polymer surface and the equilibrium contact angle mainly by the hydrophilic component of polymer. These results not only demonstrated the interdependency between two contact angle measurements, the sessile drop method and the Wilhelmy plate technique, but also provided the experimental evidence to explain the cause of time-dependent contact angle. This may also provide a new method to study dynamic behavior of polymer surface.

关键词： contact angle, surface dynamic behavior, polymer surface, dynamic contact angle, time-dependence.

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Detection of free surface composition and molecular-level structural development of styrene(S)/butadiene(B) block copolymer films during a solution-to-film process

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science china {2. 2012年第7期55卷 1263-1273页

作者： YAN ZhuoHua ZHANG RongPing ZHAO YuRong ZUO Biao ZHENG FanFan chen TianYu wang {2. shen zhiquan key laboratory of {2. textile materials and manufacturing technology of ministry of education Department of Chemistry Zhejiang Sci-Tech UniversityHangzhou 310018China Institute of Polymer science Zhejiang UniversityHangzhou 310027China

The surface chemical structure development in solution-cast styrene(S)/butadiene(B) block copolymer films as a function of solvent evaporation time was investigated using sum frequency generation vibrational spectroscopy(SFG).The surface structure formation of the styrene(S)/butadien(B) block copolymer(30 wt% PS) films during the solution-to-film process was found to be controlled mainly by dynamic factors,such as the mobility of the PB block in *** SB diblock copolymers,a pure PB surface layer was formed only when the film was cast by dilute toluene *** increasing concentration of casting solution,PB and PS components were found to coexist on the film surface,and the morphology of the PB component on the film surface changed from cylindrical rods to *** SBS triblock copolymers,a small amount of PS component existed on the surface even if the film was cast by 1.0 wt% toluene *** addition,PS components at the outermost layer of the film increased and the length of PB cylindrical rods on the surface decreased with increasing concentration of casting solution.

关键词： styrene/butadiene block copolymer chain architecture casting solution concentration surface structure sum frequen-cy generation vibrational spectroscopy

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Superhydrophobic hierarchical porous divinylbenzene polymer for BTEX sensing and toluene/water selective detection

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Chinese Chemical Letters 2020年第8期31卷 2125-2128页

作者： Yang chen Luyu wang Jiawei Kong Bing {2. Jiaqiang Xu NEST Lab Department of PhysicsDepartment of ChemistryCollege of ScienceShanghai UniversityShanghai 200444China Institute of Fiber Based New Energy materials The Key Laboratory of Advanced Textile Materials and Manufacturing Technology of Ministry of EducationSchool of Materials Science and EngineeringZhejiang Sci-Tech UniversityHangzhou 310018China MBA Center Shanghai UniversityShanghai 200444China

This work reports a superhydrophobic divinylbenzene polymer with hierarchical porous structure as sensing material to modify the quartz crystal microbalance(QCM)to detect benzene,toluene,ethylbenzene,and xylene(BTEX)***,sensing results toward toluene vapor in different relative humidities indicates that this superhydrophobic polymer has favorable toluene/water selective detection ***,the limit of detection toward toluene is lower than 1 ppm.

关键词： Quartz crystal microbalance(QCM) BTEX Superhydrophobic Porous polymer Gas sensor

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