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【期刊论文】Thermal behavior of copper powder prepared by hydrothermal treatment
刘孝波, Wencheng Hu, Lin Zhu, Dong Dong, Wei He, Xianzhong Tang, Xiaobo Liu
J. Mater Sci: Mater Electron,-0001,():
-1年11月30日
Copper powder is synthesized by hydrothermal treatment using the copper powder obtained from the chemical reduction method as a precursor. The copper powder is also treated in benzotriazole solution. The powder X-ray diffraction patterns and SEM photomicrographs exhibit that the copper powder possesses perfect crystallinity and narrow size distribution. The thermal behavior of the three kinds of copper powder is evaluated by thermogravimetry and derivative thermogravimetry. Comparing with the sample prepared by means of the chemical reduction method, the copper powder treated under hydrothermal condition displays a peak temperature of the formation of Cu2O shifting from 60.49
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刘孝波, ZhiYong Qian, Sai Li, Yi He, XiaoBo Liu
ZY. Qian et al. Polymer Degradation and Stability 84 (2004) 41-47,-0001,():
-1年11月30日
A new kind of aliphatic polyetheresteramide copolymers (PEEAs) based on E-caprolactone, 11-aminoundecanoic acid, and poly (ethylene glycol) (PEG) were synthesized by melt polycondensation. The thermal and hydrolytic degradation behaviour of these copolymers was studied using FTIR, 1H-NMR, and TGA. PEG content, thickness of the test sample, and pH of degradation medium have great effect on degradation rate. The degradation rate increased with PEG content and pH, but decreased with thickness of the test sample.
Polyetheresteramide, Degradable polymer, Thermal degradation, Hydrolytic degradation, TG
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刘孝波, Qian Zhiyong, Li Sai, Zhang Hailian, Liu Xiaobo
Colloid Polym Sci (2003) 281: 869-875,-0001,():
-1年11月30日
A new type of biodegradable polyesteramide P(LA/AU) based on lactic acid and aminoundecanoic acid was synthesized by the melt polycondensation method. The copolymers obtained were characterized by FTIR. 1H-NMR. DSC. and XRD。 The in vitro degradation behavior of the copolymers was strdied using weighing. H-NMR, FTIR. DSC, and SEM. With the increase in aminoundecanoic acid units, the milting temperature and units, the melting temperature and crystallinity increased, but the water absorption and degradation rate decreased accordingly. During degradation in vitro, the ester mority decreased due to ester cleavage along the macromolecular main chain. As degradation proceeded, the melting temperature and crystallinity increased at first, then started to decrease because the crystalline phase was destroyed.
Polyesteramide, Biodegradable polymer, Hydrolytic degradation, Aminoundecanoic acid, Surface morphology
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刘孝波, Zhiyong Qian, Sai Li, Yi He, Cao Li, Xiaobo Liu
Z. Y. Qian et al. Polymer Degradation and Stability 81 (2003) 279-286,-0001,():
-1年11月30日
A new kind of polyesteramide copolymer based on e-caprolactone and 11-aminoundecanoic acid has been synthesized by melt polycondensation. The copolymers were characterized by FTIR, 1H-NMR, DSC, and WAXD. With the increase in aminoundecanoic acid content, the melting temperature, heat of fusion, and Td, 50% increased accordingly. The thermal degradation of the P (CL/AU) x/y copolymers was studied using FTIR, and TG During thermal degradation, the ester bond decomposes at lower temperature, then the amide bond decomposes at higher temperature.
Polyesteramide, Biodegradable polymer, Crystallinity, Thermal degradation, Nylon 11
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【期刊论文】Synthesis and properties of phenolphthalein-based polyarylene ether nitrile copolymers
刘孝波, Cao Li, , Yi Gu, Xiaobo Liu
C. Li et al. Materials Letters 60 (2006) 137-141,-0001,():
-1年11月30日
Phenolphthalein-modified polyarylene ether nitrile copolymers were synthesized by nucleophilic substitution reaction of 2,6-difluorobenzonitrile (DFBN) with varying molar ratios of phenolphthalein (PP) and hydroquinone (HQ). The copolymers were chemically and physically characterized to have good thermal and mechanical properties. PP content of the copolymers has influence on glass transition temperature (Tg) as well as decomposition temperature (Tid). Coats–Redfern method was applied to study the thermal decomposition kinetics of the copolymers to predict the lifespan under thermal aging process of the copolymers, the results show that the lifespan increases with increasing PP content. © 2005 Elsevier B.V. All rights reserved.
Polyarylene ether nitrile, Copolymer, Synthesis, Thermal decomposition, Kinetics study
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