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Wang X.,Marine Chemical Research Institute Co. | Wei X.,Qingdao University of Science and Technology | Song C.,Qingdao University of Science and Technology
Journal of Nanomaterials | Year: 2015

Semimetal Bi and Sb thin films with novel hierarchical structures were synthesized on zinc substrate via a hydrothermal method. X-ray diffraction (XRD) analysis confirmed the formation of pure semimetals Bi and Sb. Scanning electron microscopy images showed that Bi films constructed with microtube arrays and hierarchical microspheres can be obtained selectively by altering the concentration of Bi3+ ions. The synthesized Sb films were constructed with bowl-shaped particles. The growth process of these semimetal architectures was briefly discussed. © 2015 Xiao Wang et al. Source

Wang X.,State Key Laboratory of Marine Coating | Wang X.,Marine Chemical Research Institute Co. | Hou P.,State Key Laboratory of Marine Coating | Hou P.,Marine Chemical Research Institute Co. | And 2 more authors.
Materials China | Year: 2014

The mulsifier-free polymerization with semi-continuous adding method with small quantities of the self-made polymerizable emulsifier is studied. The soap-free emulsion is synthesized by methyl methacrylate, vinyl cyanidevinyl cyanide, butyl acrylate, 2-hydroxyethyl acrylate and acrylic acid. The preparation of coating process is not easy demulsification by using soap free emulsion, and the coating has a good adhesion with the substrate. In the application experiment of soap-free emulsion, the influence of emulsion type, glass transition temperature and the type of primer on the film appearance, adhesion and resistance to salt fog performance are analysized. The physical and chemical properties of self-made soap-free emulsion are evaluated by testing appearance and all kinds of stabilities of the emulsion, and the glass-transition temperature of the self-made soap-free emulsion is determined according to DSC. The results are shown that the self-made soap-free emulsion has good stability, and the self-made soap-free emulsion has basically reached the industrial application effect. Because of having no interface effect of emulsifier, hard and soft monomer proportion of soap-free emulsion in 1.4, there is good adhesion, film density, excellent resistance to salt fog. The waterborne coating of cabin finish is fine and close by using the soap free emulsion. And soap free emulsion which is with high glass transition temperature has good resistance to salt fog within 500 hours, while the glass transition temperature is lower, in the 1000 hours salt fog effect is more outstanding. It is shown that the finish has excellent adhesion with different primers and good resistance to salt fog performance. Source

Li Z.,State Key Laboratory of Marine Coatings | Li Z.,Marine Chemical Research Institute Co. | Li Z.,Beijing University of Chemical Technology | Wang H.,State Key Laboratory of Marine Coatings | And 12 more authors.
Pigment and Resin Technology | Year: 2016

Purpose - This paper aims to discuss how acrylic resin influences the smoke generation of intumescent flame retardant coatings. Design/methodology/approach - Thermal decomposition kinetics is used in this study to simulate the burning process. The thermal decomposition of acrylic resin can be identified in the intumescent coatings through the multi-peak fitting of derivative thermogravimetric (DTG) curves. The dormant influence of acrylic resin, combined with the smoke density, is calculated. Findings - Multiple peaks fitting method of DTG curves helps estimate the decomposition process of acrylic resin in flame retardant coating. Combining DTG data with the smoking curve, smoking generation of acrylic resin during the combustion could be evaluated. The decomposition conversion rate of acrylic resin is 21.13 per cent. Acrylic resin generates 34.64 per cent of the total amount of smoke produced during the combustion of intumescent flame retardant coatings. Research limitations/implications - All the other intumescent flame retardant coating systems could be studied using the same approach as that used in this work to achieve an improved understanding of the smoke generation process during combustion. Practical implications - The method developed here provided a simple and practical solution to analyse the decomposition and smoking generation of acrylic resin in the coating mixtures. It also can be used to analyse any thermal decomposition process of any mixed compounds. Originality/value - The analysis method to evaluate resin's smoking generation of coating's total generation is novel, and it could be applied in all kinds of coatings and mixtures to estimate the smoking generation of one composition. © Emerald Group Publishing Limited. Source

Liang X.,Marine Chemical Research Institute Co. | Chen X.,Marine Chemical Research Institute Co. | Liang Z.,Marine Chemical Research Institute Co. | Zhou Y.,Marine Chemical Research Institute Co. | And 2 more authors.
OCEANS 2016 - Shanghai | Year: 2016

This paper presents one syntactic foam with excellent mechanical properties and prominent hydrostatic pressure performance for 11000 meters deep-sea. The properties of the syntactic foam are studied on the basis of relevant standards. The compressive strength, compressive modulus and shear strength of syntactic foams are about 100MPa, 1300MPa and 40MPa separately in atmosphere environment. The water absorption of the material is less than 1percent in the 110MPa hydrostatic pressure for 8h, and the appearance maintains intact in the 140MPa hydrostatic pressure when the density of the syntactic foam is between 0.670 to 0.688g/cm3. © 2016 IEEE. Source

Cong W.,Marine Chemical Research Institute Co. | Xiao L.,Marine Chemical Research Institute Co. | Wang K.,Marine Chemical Research Institute Co. | Chen Z.,Marine Chemical Research Institute Co. | And 2 more authors.
Asian Journal of Chemistry | Year: 2013

In recent years, high-efficiency and non-toxic antifouling techniques are predominant in view of environmental protection and public safety. In this paper, biomimetic antifouling technique was carried out. Poly(vinyl alcohol)-co-poly(acrylamide) (PVA/PAM) macroporous hydrogels were synthesized by porogenic technique using PEG200, PEG1000 and PEG6000 as pore forming agents, polyvinyl alcohol and acrylamide (AM) as raw materials and while polyvinyl alcohol could enhance the mechanical strength of macroporous hydrogels. Poly(ethylene glycol) with different molecular weight made different pore structure, when macroporous hydrogel had a porous structure with a pore size mostly between 10-30 μm with PEG1000 and possessed good mechanical strength which was suitable for the culture medium of marine bacterium. Further, we extracted Kytococcus sedentarius which had bacteriostasic activity from marine microbial biofilm. PVA/PAM macroporous hydrogel with Kytococcus sedentarius in it made biomimetic biofilm and their antifouling performance were tested in the sea for 5 months. It is suggested that the biomimetic biofilm with only a little green alga on it for 5 months demonstrated better antifouling properties. Source

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