Papers by Author: Lin Liu

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Authors: Lin Liu, Yun Qing Zhu, Jing Song, Si Chen
Abstract: Multi-walled carbon nanotubes (MWCNTs) are incorporated into Polyimide (PI) film in both pristine and functionalized forms through in-situ polymerization. MWCNTs and NH2-MWCNTs lead to improved mechanical properties such as better tensile strength and elongation at break, as well as increased surface friction coefficient. The NH2-MWCNTs can reduce the total wear weight loss of the composite to a larger extent compared with MWCNTs. 1.0 wt% NH2-MWCNTs/PI has the lowest weight loss of 20.6 % of pure PI. Mechanism of two-stage wear procedure is discussed. We found that PI composite films with lower friction coefficient tend to lose less weight in the first stage, and the ones with better mechanical properties show better wear resistance in the whole wear procedure. Owing to the low surface energy, Natural mica is employed as the substrate for PI film.
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Authors: Lin Liu, Jing Song, Chong Wang
Abstract: One kind of bismaleimide resin (BMI) was prepared from Michael addition reaction with modification carbon nanotubes (m-CNTs). CNTs were modified by N-phenyl maleimide (N-PMI) and ethylenediamine. The effect of modification was determined by NMR spectra and Raman Analyser. The cure kinetics, thermal behavior and mechanical property of carbon nanotubes/bismaleimide-o,o-diallyl bisphenol A resin (CNTs/BMI-BA) were studied. It was found that this kind of CNTs can be easily dispersed in high performance resin only with a slight stirring. The curing apparent activation energy (Ea) decreased with the increasing amount of m-CNTs. The maleimide-CNTs could fully express its unique mechanical properties and dramatically increase the reaction activity, the storage modulus, impact strengths and bending stress of the CNTs/BMI-BA composites while the CNTs-COOH reduce the important mechanical properties. These critical enhancements will definitely help to attract more researches in this field.
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Authors: Zheng Zhou Wang, Lin Liu, Gan Xin Jie, Ping Kai Jiang
Abstract: Flame retarded ethylene-vinyl acetate copolymer (EVA) was prepared in a melt process containing melamine phosphate (MP), or MP in combination with dipentaerythritol (DPER) as flame retardants. The influence of MP and MP/DPER on flame retardant properties of EVA was investigated by limiting oxygen index (LOI) and UL 94 test. Thermal decomposition of the flame retardants and flame retarded EVA composites was studied by the thermogravimetric analysis. The results show that MP used alone in EVA does not exerts good flame retardancy, even at a loading of 50wt%. It is found that the flame retardant properties of the EVA/MP/DPER composites is greatly improved when a suitable amount of MP substituted by DPER. Moreover, mechanical properties of the EVA composites were studied.
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