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Online since: January 2013
Authors: Wei Hong Wu, Xia Ye, Chun Zheng Wang, Lei Liu
Zinc Hydroxystannate-coated Mineral Grade Mg(OH)2 as Flame-Retardant and Smoke Suppression for Flexible PVC
CHUNZHENG Wang 1a, WEIHONG Wu1, 2b, XIA Ye3c and LEI Liu1d
1College of Chemistry and Environmental Science, Hebei University, Baoding, 071002, China
2College of Science, Agricultural University of Hebei, Baoding, 071001, China
3Cangzhou Teachers’ College, Cangzhou, 061001, China
awangchunzheng@126.com, bweiweibigq@163.com, ccz_yexia@163.com, dccesliulei@hbu.edu.cn
Keywords: Mg(OH)2; Poly(vinyl chloride); Flame retardant; Smoke suppression; Thermal analysis
Abstract: A zinc hydroxystannate-coated mineral grade Mg(OH)2 (ZHSCMH) was synthesized as flame retardant and smoke suppressant for flexible poly (vinyl chloride).
As shown in Fig. 3, the morphology of the char residue generated from the untreated PVC shows an alveolate and breakable structure with some small pores in the surface (Fig. 3 (a)), therefore, heat and flammable volatiles could easily penetrate the char layer into the flame zone during the process of burning, so the flame retardancy of the sample is poor, while those generated from the treated ones show a more condensed structure, the condensed structure can form a barrier to inhibit combustible gases and transfer heat energy to the PVC bulk, which is beneficial to the improvement of flame retardancy.
As shown in Fig. 3, the morphology of the char residue generated from the untreated PVC shows an alveolate and breakable structure with some small pores in the surface (Fig. 3 (a)), therefore, heat and flammable volatiles could easily penetrate the char layer into the flame zone during the process of burning, so the flame retardancy of the sample is poor, while those generated from the treated ones show a more condensed structure, the condensed structure can form a barrier to inhibit combustible gases and transfer heat energy to the PVC bulk, which is beneficial to the improvement of flame retardancy.
Online since: February 2011
Authors: Ke Jie Zhang, Xin Wang, Yu Ping Tong, Xiao Heng Liu
Sputtering Phenomena of Zns Nanoparticles with Graphite Sheaths by Impacting of High-Energy Electron in a Transmission Electron Microscope
Kejie Zhang1a, Yuping Tong2,b, Xiaoheng Liu1,c and Xin Wang1,d
1 Key Laboratory of Soft Chemistry and Functional Materials of the Ministry of Education,
Nanjing University of Science and Technology, Jiangsu Province, Nanjing, 210094 People’s Republic of China
2 School of Civil Engineering and Communication, North China University of Water Conservancy and Electric Power, Zhengzhou, 450011, People’s Republic of China
a zhangkejie2003@163.com, b huabeitong@yahoo.cn, c xhliu@mail.njust.edu.cn,
d wxin48@126.com
Keywords: Nanomaterial; Semiconducting Material; Zns; Nanoparticle; Sputtering Phenomenon; Well-Dispersed
Abstract.
Sputtering yield depended on the target composition and surface structure, the energy and electric charge of the incident charged particles [1].
Although much research work has been focused on TEM as a powerfully analytical tool, there are only a few reports on how the high electron beams affects the structures and components of the detected samples in situ TEM experiments [17].
The weak interaction between ZnS and C resulted in the surface defects of target structure.
Sputtering yield depended on the target composition and surface structure, the energy and electric charge of the incident charged particles [1].
Although much research work has been focused on TEM as a powerfully analytical tool, there are only a few reports on how the high electron beams affects the structures and components of the detected samples in situ TEM experiments [17].
The weak interaction between ZnS and C resulted in the surface defects of target structure.
Online since: January 2019
Authors: Li Jun Wang, Kazuo Umemura
This might be because that the electronic structure of nanotubes will be perturbed differently when the tubes are in different environments.
[2] Tasis D, Tagmatarchis N, Bianco A and Prato M, Chemistry of Carbon Nanotubes.
Walls, Structure-based carbon nanotube sorting by sequence-dependent DNA assembly, Science. 302 (2003) 1545-1548
Bachilo, Dependence of Optical Transition Energies on Structure for Single-Walled Carbon Nanotubes in Aqueous Suspension: An Empirical Kataura Plot, Nano Lett. 3 (2003) 1235-1238
[2] Tasis D, Tagmatarchis N, Bianco A and Prato M, Chemistry of Carbon Nanotubes.
Walls, Structure-based carbon nanotube sorting by sequence-dependent DNA assembly, Science. 302 (2003) 1545-1548
Bachilo, Dependence of Optical Transition Energies on Structure for Single-Walled Carbon Nanotubes in Aqueous Suspension: An Empirical Kataura Plot, Nano Lett. 3 (2003) 1235-1238
Online since: October 2012
Authors: Hong Yan Wang, Gang Yan, Wei Guo, Xiao Bo Li, Hong Chao Wang, Hua Qing Xue
Oil shale kerogen is a complicated polymer with a kind of three-dimension structure, the pyrolysis process of oil shale becomes very complex, so far the molecular structure of kerogen remains unsolved [1,2].
It is concluded that the lower value of activation energy (109.8 kJ/mol) represented relatively weak chemical bonds ruptured to produce bitumen and gas at the first stage, such as the rupture of C-O, C-S, and the branched function groups in kerogen long molecular structure.
Industrial Engineering Chemistry Research. 1987; 26:1351-1356
It is concluded that the lower value of activation energy (109.8 kJ/mol) represented relatively weak chemical bonds ruptured to produce bitumen and gas at the first stage, such as the rupture of C-O, C-S, and the branched function groups in kerogen long molecular structure.
Industrial Engineering Chemistry Research. 1987; 26:1351-1356
Online since: December 2011
Authors: Da Sen Bi, Jian Zhang, Yu Lin Ning, Ben Dong Peng, Zhi Hua Wang
Moreover finite element simulation software can’t structure complex geometric model now, geometric model are structured by special CAD software.
Actual draw bead is used , the structure of die is single-action die. forming process is divided two phases: closure phase and punch phase.
Acknowledge This work was supported by Ministry of industry and information Technology of the People’s Republic of China support project under Grant No. 2009ZX04014-063-03, and Tianjin scientific and technical support project under Grant No. 08ZCKFGX02200 and 09ZCKFGX02700, and Tianjin Key Subject for Materials Physics and Chemistry.
Actual draw bead is used , the structure of die is single-action die. forming process is divided two phases: closure phase and punch phase.
Acknowledge This work was supported by Ministry of industry and information Technology of the People’s Republic of China support project under Grant No. 2009ZX04014-063-03, and Tianjin scientific and technical support project under Grant No. 08ZCKFGX02200 and 09ZCKFGX02700, and Tianjin Key Subject for Materials Physics and Chemistry.
Online since: May 2014
Authors: Miao Miao Xiao, Hui Ning Xiao, Yuan Feng Pan
Preparation and properties of compatibilized poly(butylenesadipate-co-terephalate)/thermoplastic starch blends
Miaomiao Xiao1,a, Yuanfeng Pan2,b and Huining Xiao1,3c
1 Department of Chemical Engineering, University of New Brunswick, Fredericton, Canada
2 Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology, School of Chemistry and Chemical Engineering, Guangxi University, Nanning China
3 School of Environment Sci & Eng.; North China Electrical Power Univ., Baoding, China
amxiao@unb.ca, byuanfengpan@hotmail.com, chxiao@unb.ca
Keywords: poly(butylenesadipate-co-terephalate; glycidyl methacrylate; thermoplastic starch; blends.
Starch was firstly plasticized with glycerol and water in the Haake mixer to disrupt the granular structure of starch.
The results indicated that the compatibility was improved and network structure was created when the TPS content approached to the matrix content.
The well-dispersed TPS particles in PBAT matrix as well as the formation of network structure resulted in an improvement of tensile strength of the blends Acknowledgements This research was financially supported by NSERC Canada Strategic Network – Innovative Green Wood Fibre Products, National Natural Science Foundation of China (No. 21306027 & 51379077), and Guangxi Natural Science Foundation (2013GXNSFCA019004).
Starch was firstly plasticized with glycerol and water in the Haake mixer to disrupt the granular structure of starch.
The results indicated that the compatibility was improved and network structure was created when the TPS content approached to the matrix content.
The well-dispersed TPS particles in PBAT matrix as well as the formation of network structure resulted in an improvement of tensile strength of the blends Acknowledgements This research was financially supported by NSERC Canada Strategic Network – Innovative Green Wood Fibre Products, National Natural Science Foundation of China (No. 21306027 & 51379077), and Guangxi Natural Science Foundation (2013GXNSFCA019004).
Online since: January 2012
Authors: B.G.L.T. Samaranayake, A.M.U.S.K. Alahakoon, D.M.G. Preethichandra, K. Kaneto
Introduction
Thanks to the advancements in chemistry and material sciences, sensors and actuators made of soft materials have reached the climax of their development cycle.
The magnitude and speed of these deflections depend on the nature of the counter-ions, the structure of the electrodes, the level of hydration (solvent saturation), etc [3, 4, 5, 6, 7].
Justification for the structure of the proposed dynamic model.
With the results of the preliminary identification experiments, the BJ model structure is used here for the model verification as that has the capability of estimating independent dynamical models between input-output and noise-output.
The magnitude and speed of these deflections depend on the nature of the counter-ions, the structure of the electrodes, the level of hydration (solvent saturation), etc [3, 4, 5, 6, 7].
Justification for the structure of the proposed dynamic model.
With the results of the preliminary identification experiments, the BJ model structure is used here for the model verification as that has the capability of estimating independent dynamical models between input-output and noise-output.
Online since: July 2018
Authors: Robin Hron, Martin Kadlec, František Martaus
Mechanical Properties of Fibre Reinforced Geopolymer Composites Exposed to Operating Fluids
Hron Robin1,a, Kadlec Martin1,b and Martaus František2,c
1Strength of Structure, VZLU - Czech Aerospace Research Centre, Prague, Czech Republic
2Composite Technologies, VZLU - Czech Aerospace Research Centre, Prague, Czech Republic
ahron@vzlu.cz, bkadlec@vzlu.cz, cmartaus@vzlu.cz
Keywords: Composite, geopolymer, environment, mechanical properties.
Tests All tests were performed in the testing laboratory of Strength of structure department of the Czech aerospace research centre according to valid standards on the static test machine Instron 55R1185.
Conclusion The material tests showed the significant influence of the environment on the material characteristics of the studied geopolymer material and it is therefore necessary to consider this when designing structures.
Davidovits, Geopolymer Chemistry & Applications, Institute Géopolymèr, France, 2008
Tests All tests were performed in the testing laboratory of Strength of structure department of the Czech aerospace research centre according to valid standards on the static test machine Instron 55R1185.
Conclusion The material tests showed the significant influence of the environment on the material characteristics of the studied geopolymer material and it is therefore necessary to consider this when designing structures.
Davidovits, Geopolymer Chemistry & Applications, Institute Géopolymèr, France, 2008
Online since: September 2013
Authors: Jian Qiang Zhang, Lin Tan, Hui Xia Feng, Jiao Chen
Usually, Ionic liquids(ILs) molecules were synthesized to construct the structure like bounded anions and organic cations with long chain.
Fig.2 SEM image of (a) CMMIm-PANI, (b)CMMIm-PANI@ATP composite In Fig.2a, neat PANI exhibited particle agglomeration by compound in acid IL, and the structure is compact.
These results show that PANI cannot completely decompose in nitrogen and is carbonized to form graphitic structures.
[2] Adrian V.A., Jose A.S., Gustavo E., et al., Doping of polyaniline by acid–base chemistry: density functional calculations with periodic boundary conditions, J.
Fig.2 SEM image of (a) CMMIm-PANI, (b)CMMIm-PANI@ATP composite In Fig.2a, neat PANI exhibited particle agglomeration by compound in acid IL, and the structure is compact.
These results show that PANI cannot completely decompose in nitrogen and is carbonized to form graphitic structures.
[2] Adrian V.A., Jose A.S., Gustavo E., et al., Doping of polyaniline by acid–base chemistry: density functional calculations with periodic boundary conditions, J.
Online since: May 2020
Authors: F.F. Musin, S.N. Galyshev, A.I. Gomzin, Rida Gallyamova, Nail Zaripov
Marx Street 12, Russia
2Ufa Chemistry Institute of RAS, 450054, Ufa, Prospect Oktyabrya, 71, Russia
3Institute of Solid State Physics of RAS, 142432, Chernogolovka, 2 Academician Ossipyan str., Russia
aandre-gomzi@yandex.ru, brida_gallyamova@mail.ru, cnzaripov@mail.ru, dgalyshew@gmail.com, ef-musin@yandex.ru
Keywords: carbon fiber, composite, PAN, high modulus, high strength.
Accordingly, the surfaces of high elastic modulus carbon fibers and high tensile strength fibers will have a different structure, and, as a result, they will interact in different ways with the matrix material at fabrication of the composite.
In particular, for a composite with an aluminum matrix, the carbon fiber surface structure determines the intensity of the formation of aluminum carbides.
Currently, there is little information in the literature about the nature of the interaction of carbon fibers with a matrix, depending on their elastic modulus and strength, which are determined by the structure.
Accordingly, the surfaces of high elastic modulus carbon fibers and high tensile strength fibers will have a different structure, and, as a result, they will interact in different ways with the matrix material at fabrication of the composite.
In particular, for a composite with an aluminum matrix, the carbon fiber surface structure determines the intensity of the formation of aluminum carbides.
Currently, there is little information in the literature about the nature of the interaction of carbon fibers with a matrix, depending on their elastic modulus and strength, which are determined by the structure.