Pingsheng He

University of Science and Technology of China

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Dazhu Chen

Shenzhen University

Gang Zou

Tongji University

Haiyang Yang

University of Science and Technology of China

Kun Fang

South China University of Technology

Yaozhong Ruan

University of Science and Technology of China

Weibing Xu

Gansu Agricultural University

Beifang Yang

Hubei Provincial Center for Disease Control and Prevention

Bangkun Jin

University of Science and Technology of China

Jouko Peltonen

Åbo Akademi University

Cheng Yiyun

University of Science and Technology of China

Cooperative Institutions

University of Science and Technology of China

Chinese Academy of Sciences

University of Chinese Academy of Sciences

Hefei University of Technology

Sun Yat-sen University

Hefei University

Hefei National Center for Physical Sciences at Nanoscale

Anhui University

Zhejiang University

Huazhong University of Science and Technology

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Ordered Arrangement of Micro-beads in Single Line by Micromolding in Capillaries

Chinese Journal of Chemical Physics (2006)

Heng Li Jianhua Zhu Jin-xia Shi Pingsheng He

An effective procedure was demonstrated to arrange spherical micro-beads into ordered, long, line-shape arrays by means of ``micromolding in capillaries'' in soft lithography. Polystyrene (PS) micro-beads with 2-3mm of diameter were used as units and arranged by molding in continuous micro-channels formed by the conformal contact between a glass substrate and an elastomeric stamp with micrometer-scale line patterns on the surface. An aqueous emulsion of PS micro-beads filled these channels by capillary action and was allowed to solidify. The stamp was then removed. The PS micro-beads could be assembled into a string of long line-shape arrays, and the strings were then joined by heating them to their softening temperature. In order to separate the PS micro-bead string from the substrate, the glass was covered with a thin layer of Al or polymethyl methacrylate. After the Al layer was dissolved, the string of PS micro-beads would be released. A string of micrometer scale PS beads can be used as a simple and direct ``model'' of a real macromolecular chain. It is hopeful to show an analogue with the condensed process of real macromolecules in a mesoscopic scale using the ``string of PS micro-beads''.

Bead

Micrometer

Polystyrene

Mesoscopic physics

Soft Lithography

Molding (decorative)

10.1360/cjcp2006.19(4).352.3

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Citations (4)

Cure behavior of UP/Org‐MMT/MEKP/cobalt octoate nanocomposites by the dynamic torsional vibration method

Journal of Applied Polymer Science (2005)

Yiyun Cheng Dazhu Chen Chunlei Wang Pingsheng He

Abstract The cure behavior of unsaturated polyester(UP)/organo‐montmorillonite (Org‐MMT)/methyl ethyl ketone peroxide (MEKP)/cobalt octoate intercalated nanocomposites at varying temperatures and Org‐MMT loadings was investigated by the Dynamic Torsional Vibration Method (DTVM). The apparent kinetic parameters of the cure reaction, including the gelation time t g , apparent activation energy E a , and curing rate, etc., were estimated by Flory's gelation theory, non‐equilibrium thermodynamic fluctuation theory, and Avrami equation. The theoretical prediction is in good agreement with the experimental results obtained by the DTVM. The gelation time t g increases, and the rate of curing reaction decreases, with increasing Org‐MMT loadings, but there is no obvious effect of Org‐MMT on the apparent activation energy E a and the curing process of nanocomposites. A two‐step cure process of UP was observed due to the addition of Org‐MMT. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 97: 1–7, 2005

Avrami equation

10.1002/app.21605

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Citations (8)

Adhesion of epoxy resin to glass

Proceedings of the Royal Society of London A Mathematical and Physical Sciences (1982)

E. H. Andrews Pingsheng He C. Vlachos

A recently developed fracture mechanics test, which involves pressurization of an internal circular flaw, has been used to investigate the adhesion of an epoxy resin to Pyrex glass. Specimens were tested after various times of immersion in water at 80 °C, and the adhesive failure energy 6 determined as a function of crack velocity. The effects of adding silane coupling agents to the epoxy resin, and the influence of water pH, were particularly studied. The theory of generalized fracture mechanics is used to derive, from 6, an intrinsic adhesive failure energy d0 which is the energy required to break interatomic bonds across unit area of the interface. The decrease of 60 with time follows first-order reaction kinetics with a rate constant controlled by the type and concentration of coupling agent as well as by the pH of the aqueous environment. At zero immersion time the data all extrapolate to a ‘dry ’ 0o-value of 7.25 J m-2, some 24 times the expected van der Waals interaction energy. The results are interpreted in terms of the chemical hydrolysis of interfacial bonds.

Immersion

10.1098/rspa.1982.0076

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Citations (22)

Study on cure behavior of epoxy resin–BF₃–MEA system by dynamic torsional vibration method

Journal of Applied Polymer Science (1991)

Pingsheng He Li Chune

Abstract A dynamic torsional vibration method has been developed and used to investigate the isothermal cure processes of resin system of epoxy resin–boron trifluoride monoethylamine complexSiO 2, optimizing its cure conditions and estimating the apparent dynamic parameters including gel time and rate of cure reaction and discussing the effect of filler on cure. The cure behavior of resin system has been predicted by the nonequilibrium thermodynamic theory. The theoretical prediction is in good agreement with the experimental results obtained by dynamic torsional vibration method.

Isothermal process

Torsional Vibration

Cure rate

10.1002/app.1991.070430520

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Citations (26)

Elasticity of Langmuir monolayer detected by dynamic oscillation method

Colloids and Surfaces A Physicochemical and Engineering Aspects (2002)

Pingsheng He Kun Fang Gang Zou Jouko Peltonen Jarl B. Rosenholm

Stearic acid

Elasticity

Classification of discontinuities

10.1016/s0927-7757(01)01031-7

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Citations (33)

Thin SiC films prepared by pyrolysis of polyimide Langmuir–Blodgett films on silicon

Applied Physics Letters (1994)

Beifang Yang Yue Zhou Weili Cai Pingsheng He Yaozhong Ruan

The quasi-single-crystal SiC thin films were grown on silicon (111) by pyrolysis of polyimide LB films at 1000 °C in vacuum. The chemical and structural characterizations were studied by x-ray diffraction, infrared absorption, x-ray photoelectron spectroscopy, and Laue photography.

10.1063/1.111911

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Citations (19)

Preparation of thin film of TS and PTS by Langmuir-Blodgett techniques

Journal of Materials Science (1989)

Pingsheng He Bai Jian-min Gang Yao Guien Zhou Changsui Wang

Arachidic acid

10.1007/bf02385395

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Citations (2)

Discussing the Construction of Elaborate Course "Experiments for Polymer Physics"

Chinese Polymer Bulletin (2007)

Pingsheng He

Some work concerning the construction of elaborate course Experiments for polymer physics was introduced in this paper.

Course (navigation)

Polymer physics

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PP–PP‐g‐MAH–Org‐MMT nanocomposites. I. Intercalation behavior and microstructure

Journal of Applied Polymer Science (2003)

Weibing Xu Guodong Liang Wei Wang Shupei Tang Pingsheng He

Abstract The melt‐direct intercalation method was employed to prepare poly(propylene) (PP)–maleic anhydride grafted poly(propylene) (PP‐g‐MAH)–organic‐montmorillonite (Org‐MMT) nanocomposites. X‐ray diffractometry (XRD) was used to investigate the intercalation effect, crystallite size, and crystal cell parameter in these composites. Two kinds of maleated PP, with graft efficiencies of 0.6 and 0.9 wt %, and two sorts of manufacturing processes were used to prepare nanocomposites and then to investigate their effects on intercalation behavior. The results showed that the intercalation effect was enhanced by increasing the content of PP‐g‐MAH, using maleated PP with higher graft efficiency, and adopting the mold process. The crystallite size of nanocomposites perpendicular to the crystalline plane, such as (040), (130), (111), and (041), reached the minimum value when the content of PP‐g‐MAH was 20 wt %. This result indicated that the crystallite size of PP in nanocomposites decreased by proper addition of PP‐g‐MAH. Maximum values in tensile strength (40.2 MPa) and impact strength (24.3 J/m) were achieved when the content of PP‐g‐MAH was 10 and 20%, respectively. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 88: 3225–3231, 2003

Maleic anhydride

10.1002/app.11973

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Citations (81)

Capillary Extrusion Rheology and Thermal Stability of EVA/Organomontmorillonite Nanocomposites

Polymers and Polymer Composites (2005)

Dazhu Chen Weian Zhang Pingsheng He

Ethylene vinyl acetate (EVA) co-polymer-based nanocomposites based on organomontmorillonite (Org-MMT) (Nanolin DK) were prepared by melt compounding without any additional compatibiliser. A partially-intercalated partially-exfoliated structure was revealed in the nanocomposites by X-ray diffraction and transmission electron microscopy Attention was paid to the steady shear rheological properties of the nanocomposites via a capillary rheometer owing to the resemblance of its conditions of operation to those prevailing during the practical fabrication process of materials. Increasing the temperature improves the flow properties but decreases the pseudoplasticity of the melts. With increasing shear stress (or shear rate), the shear viscosity (η) and flow activation energy ( E η ) drop while the extrudate swell ratio ( d e / d c ) rises. The addition of Org-MMT leads to a reduction in both η and d e / d c of the nanocomposites as compared to the EVA matrix. The thermal stability of EVA and EVA/Org-MMT nanocomposites was also examined by thermogravimetric analysis

Die swell

Thermogravimetric analysis

Thermal Stability

10.1177/096739110501300307

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Citations (3)