Hanmin Zeng

Central South University

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Kancheng Mai

Sun Yat-sen University

Mingqiu Zhang

Ji Hua Laboratory

Yun Lu

Chinese Academy of Forestry

Ruowen Fu

Sun Yat-sen University

Jiarui Xu

Sun Yat-sen University

Jingshen Wu

University of Hong Kong

Zhiyi Zhang

North University of China

Rong Minzhi

Sun Yat-sen University

Ke Wang

Southern University of Science and Technology

Zhengjun Li

Xidian University

Cooperative Institutions

Sun Yat-sen University

Central South University

Chinese Academy of Sciences

Sichuan University

Xi'an Jiaotong University

Ministry of Education of the People's Republic of China

South China University of Technology

Huazhong University of Science and Technology

Beijing Institute of Technology

Shaanxi Normal University

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Isothermal Cyrstallization Behavior and Melting Characteristics of Injection Sample of Nucleated Polypropylene

Acta Scientiarum Naturalium Universitatis Sunyatseni (2002)

Hanmin Zeng

The isothermal crystallization behavior and melting characteristics of polypropylene (PP) nucleated by a phosphate nucleating agent (A) and a sorbital nucleating agent (D) were studied by differential scanning calorimetry.Compared with pure PP,nucleated PP showed a shorter half time of crystallization.For the pure PP,a linear dependence of half time of crystallization on the crystallization temperature was observed.However,nucleated PP showed a little dependence of half time of crystallization on crystallization temperature when nucleated PP crystallized at low temperature;while a stronger dependence of half time of crystallization was observed when nucleated PP crystallized at high temperature.Addition of nucleating agent improved crystal perfection of PP.A shoulder peak in the high temperature range of melting peak of nucleated PP but a wide peak in the low temperature range of melting peak of pure PP were observed.Obviously,PP and nucleated PP form different distribution of crystal perfection in the isothermal crystallization process.According to the half time of crystallization,nucleating agent A is more effective than D for PP crystallization.

Isothermal process

Polypropylene

Crystal (programming language)

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Citations (1)

Blends of Poly(ether ether ketone) with a Thermotropic Liquid Crystalline Polyester I. The Morphology, Crystallization, and Melting Behavior

Polymer Journal (1992)

Yang Zhong Jiarui Xu Hanmin Zeng

Thermotropic crystal

Copolyester

10.1295/polymj.24.999

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Citations (16)

Radial growth rate of spherulites in polypropylene/barium sulfate composites

European Polymer Journal (2003)

Ke Wang Jingshen Wu Hanmin Zeng

Spherulite (polymer physics)

Tacticity

Polypropylene

Barium sulfate

Barium sulphate

10.1016/s0014-3057(03)00071-5

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Citations (31)

Preparation of highly magnetic chitosan particles and their use for affinity purification of enzymes

Journal of Chemical Technology & Biotechnology (2003)

Xiaoning An Zhixing Su Hanmin Zeng

Abstract A novel protocol for preparation of highly magnetic chitosan particles, with a coercive force as high as 3500 Oe, has been developed. The surface of the particles was functionalized with aldehyde groups to facilitate the attachment of affinity ligands. The optimum conditions for the preparation of highly magnetic chitosan particles and immobilization of trypsin on magnetic particles were obtained; these particles were then used for affinity purification of aprotinin, and the conditions of affinity purification are discussed in detail. The proposed method was successfully applied to the affinity purification of aprotinin. Copyright © 2003 Society of Chemical Industry

Aprotinin

10.1002/jctb.820

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Citations (34)

The non-isothermal crystallization and curie transition behavior of PZT/P(VDF-TRFE) 70/30 0-3 composites

Acta Polymerica Sinica (2001)

Rong Zeng K. W. Kwok B. Ploss H.L.W. Chan C.L. Choy

The non isothermal crystallization and Curie transition behavior of composites consisting of lead zirconate titanate (PZT) particles embedded in a vinylidene fluoride trifluroethylene (P(VDF TrFE)70/30) copolymer matrix were investigated using differential scanning calorimetry.The crystallization temperature,crystallization rate and crystallinity of the copolymer matrix was not affected significantly by the inclusion of the PZT particles,while the overall Curie transition enthalpy decreased with increasing the PZT content.The relative amount of enthalpy corresponding to the transition from the paraelectric high temperature (HT) phase to the ferroelectric cooled (CL) phase also decreased with increasing the PZT content.This suggested that PZT particles might restrain the formation of gauche conformational defects in ferroelectric crystals and make ferroelectric crystals more perfect.

Lead zirconate titanate

Isothermal process

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Citations (0)

The reduction of Pt(IV) with activated carbon fibers—An XPS study

Carbon (1995)

Ruowen Fu Hanmin Zeng Yun Lu S.Y. Lai Wing Hong Chan

Viscose

10.1016/0008-6223(94)00152-p

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Citations (40)

Microstructure and fracture behavior of polypropylene/barium sulfate composites

Journal of Applied Polymer Science (2005)

Ke Wang Jingshen Wu Hanmin Zeng

Abstract The microstructure, mechanical properties, and fracture behavior of polypropylene (PP)/barium sulfate (BaSO 4 ) composites were studied. Four composite samples with different PP‐BaSO 4 interface were prepared by treating the filler with different modifiers. The fracture behavior of the composites under different strain rates was studied by means of Charpy impact tests and essential work of fracture (EWF) tests. It is shown that a moderate interfacial adhesion is favorable for toughening, which ensures that the particles transfer the stress and stabilizes the cracks at the primary stage of the deformation, and satisfies the stress conditions of plastic deformation for matrix ligaments subsequently via debonding. Very strong interfacial adhesion is not favorable for toughness, especially under high strain rate, because the debonding‐cavitation process may be delayed and the plastic deformation of matrix may be restrained. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 99: 1207–1213, 2006

Charpy impact test

Polypropylene

10.1002/app.22596

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Citations (28)

Studies on the Surface Interaction and Dispersity of Silver Nanoparticles in Organic Solvents

Chinese Physics Letters (2000)

Rong Zeng Rong Minzhi Zhang Ming-qiu Hanmin Zeng

Silver nanoparticles with different sizes have been prepared by microemulsion and have been surface-modified with C12H25SH. Electron spin resonance results indicate that there exist some kinds of surface local paramagnetic sites in capped Ag nanoparticles, which leads to the relation between electron spin resonance parameters and particle size deviating from Kawabata's description. There is a strong interaction between nanosilver and chloroform. The smaller the particles, the stronger the interaction. Transmission electron microscopy and ultravilolet-visible absorption spectra confirmed that Ag nanoparticles are well dispersed in chloroform, implying that a good dispersity of Ag nanoparticles in polymers could be obtained by means of solution mixing by using chloroform as the solvent.

Dispersity

Microemulsion

Silver nanoparticle

Particle (ecology)

10.1088/0256-307x/17/9/026

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Citations (8)

Studies on preparation and ion‐exchange properties of weakly acidic cation exchange fiber by preirradiation‐induced graft copolymerization with electron beam

Journal of Applied Polymer Science (1994)

Yun Lu Zhu Zhang Hanmin Zeng

Abstract Weak acidic cational exchange fibers were obtained by means of preirradiation‐induced graft copolymerization of methacrylic acid, acrylic acid, and diglycol acrylate onto polypropylene nonwoven fabric with electron beam. Effects that influence grafting and the exchange adsorptive property of the ion‐exchange fibers obtained toward transition and rare‐earth metal ions have been investigated. © 1994 John Wiley & Sons, Inc.

Acrylic acid

Polypropylene

10.1002/app.1994.070530403

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Citations (23)

Physical properties of PP‐g‐AA prepared by melt extrusion and its effects on mechanical properties of PP

Journal of Applied Polymer Science (2001)

Kancheng Mai Zhengjun Li Hanmin Zeng

Abstract Polypropylene grafting with acrylic acid, PP‐ g ‐AA (FPP), was prepared by melt extrusion. The physical properties of FPP and effect of FPP on mechanical properties of polypropylene (PP) were investigated. Experimental results showed that an increase in the grafting rate of FPP resulted in an increase in the crystallization peak temperature, melt peak temperature, and degree of crystallization of PP. Double melting peaks were observed for OPP prepared by adding dicumyl peroxide into PP and FPP with low grafting rate due to the degradation of PP. As the grafting rate was increased, the double melt peaks converted into a single melt peak. It is suggest that FPP with higher grafting rate resulted in enhanced nucleation and crystallization ability of PP. The grafting of AA onto the PP chain improved the thermal stability and mechanical properties of PP materials. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 80: 2609–2616, 2001

Polypropylene

Thermal Stability

Reactive extrusion

Acrylic acid

10.1002/app.1372

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Citations (22)