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Synthesis, characterization, and thermal properties of biodegradable polyetheresteramide-based polyurethane 总被引:1,自引:0,他引:1
WenJuan Jia CaiBing Liu Li Yang JinLiang Yang LinYu Fan MeiJuan Huang Hen Zhang GuoTao Chao ZhiYong Qian Bing Kan AnLiang Huang Ke Lei ChangYang Gong Jian Zhao JiaMing Zhang HongXin Deng MingJing Tu YuQuan Wei 《Materials Letters》2006,60(29-30):3686-3692
In this paper, a new kind of biodegradable polyetheresteramide-based polyurethane (PEEA-U) copolymers were prepared by melt polymerization from ε-caprolactone, 6-aminocaproic acid, poly(ethylene glycol), and toluene diisocyanate. The obtained polymers were characterized by 1H NMR, FTIR, DSC, WAXD, and TGA/DTG. The water absorption, hydrolytic degradation, and alkaline degradation behavior of these copolymers were also studied in detail. 相似文献
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In this paper, fuzzy logic control is put forward in a parallel hybrid hydraulic excavator for the purposes of better energy distribution and higher fuel economy. A mathematical model of parallel hybrid hydraulic excavator is presented in detail, and the parameters of components and overall system are listed and analyzed. The fuzzy logic controller is then designed to cope with energy distribution and management. To achieve better equivalent fuel consumption, genetic algorithm is implemented to fine-tune the membership functions. The control effects are compared between different control strategies, e.g. rule-based control and fine-tuned fuzzy logic control. The results indicate that hybrids with the proposed strategy can improve fuel economy for the excavator without sacrificing any system performance. 相似文献
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The Mg-Li-Zn alloy, LZ91, is a potential material for industrial application owing to its high specific strength. However, the LZ91 has so high chemical reactivity that it is easily corroded in air and an aqueous environment. In this study, an eco-friendly electrodeposition method was proposed to obtain a protective Cr/Cu coating on the LZ91 substrate. That is, the LZ91 surface electroplated a Cu undercoat in an alkaline Cu-plating bath and followed by decorative 1 μm-thick Cr electroplating in a plating bath with trivalent chromium ions. After electroplating, some of the Cr/Cu-deposited specimens were heated with a reduction flame for 0.5 s to increase the hardness of Cr-deposit. The wear resistance of as-plated and flame-hardened Cr/Cu-coated LZ91 specimens was estimated with ball-on-plate wear tester by using a steel-ball counterpart. Whereas, their corrosion resistance was evaluated in a 0.1 M H2SO4 solution before and after wear test. Experimental results show that a Cu deposit could be uniformly electroplated on the LZ91 surface by using our proposed electroplating method. The corrosion resistance of LZ91 was markedly improved after decorative 1 μm-thick Cr electroplating. After wear test, the steel counterpart was ground obviously with either as-plated or flame-hardened Cr/Cu-coated LZ91 specimen. According to the results of electrochemical corrosion test, some parts of the Cr deposit were peeled off from worn flame-hardened Cr/Cu LZ91 surface. This reduces its corrosion resistance significantly. On the other hand, the corrosion resistance of as-plated Cr/Cu LZ91 was not changed after wear test. That is, an as-plated Cr/Cu-coated LZ91 specimen could have good corrosion and wear resistance. 相似文献
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Yan Wang CaiBing Liu LinYu Fan Yong Sheng Jian Mao GuoTao Chao Jun Li MingJing Tu ZhiYong Qian 《Polymer Bulletin》2005,53(3):147-154
Summary Biodegradable PBT/PEG copolymers were synthesized by macromolecular transesterification method, and were characterized by 1H-NMR and DSC. Alkaline degradation behavior was studied too. Indirubin loaded microspheres were prepared by O/W solvent evaporation method. 相似文献
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Chao G Fan L Jia W Qian Z Gu Y Liu C Ni X Li J Deng H Gong C Gou M Lei K Huang A Huang C Yang J Kan B Tu M 《Journal of materials science. Materials in medicine》2007,18(3):449-455
Hydrolytic degradable PBT/PEG copolymer was synthesized by macromolecular transesterification method from PBT and PEG macromonomers.
The resultant copolymers were characterized by 1H-NMR and GPC. The non-isothermal crystallization behavior of these copolymers was studied by differential scanning calorimetry
(DSC). The water absorption and hydrolytic degradation behavior of PBT/PEG copolymers were also studied in detail.
This work was partly presented in 6th ASBM, July 19–22, 2004, Emei City, Chingdu, China.
Fan LY is the co-first author for this work. 相似文献
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GuoTao Chao HongXin Deng Qiong Huang WenJuan Jia WanXia Huang YingChun Gu HePing Tan LinYu Fan CaiBing Liu AnLiang Huang Ke Lei ChangYang Gong MingJing Tu ZhiYong Qian 《Journal of Polymer Research》2006,13(5):349-355
In this article, a pH sensitive semi-interpenetrating network (SIPN) hydrogel based on methacrylic acid, BSA, and PEG was
prepared by UV initiated free radical polymerization. The swelling behavior and pH sensitivity of these hydrogels were studied
in detail. With the increase in pH of the aqueous solution from 1.7 to 9.23, the swelling ratio of these hydrogels increased
accordingly. The effect of BSA and crosslinker (BIS) content on the swelling behavior was more complicated, and the results
were shown in the text.
Deng HX is the co-first author for this article. 相似文献
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Hou XiaoJuan Zhong JiXin He Jian Yang ChangJun Yu JunBin Mei LinYu Mu JiLiang Geng WenPing Chou XiuJian 《中国科学:技术科学(英文版)》2022,65(5):1169-1178
Science China Technological Sciences - The research on flexible pressure sensors has drawn widespread attention in recent years, especially in the fields of health care and intelligent robots. In... 相似文献
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