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Stabilize and Reinforce Hydrogen-Bonded Polymer Complex elastic fiber by Catechol Chemistry and Coordination

Chinese Journal of Polymer Science 2023年第12期41卷 1846-1855,I0006页

作者： Ze-Xin Liu De-Zhong Liu Cai-Hong Zhang Wei-Jie Wang Hao Huang Shu-Guang Yang State Key Laboratory for Modification of Chemical fibers and Polymer Materials Center for Advanced Low-Dimension MaterialsCollege of Materials Science and EngineeringDonghua UniversityShanghai 201620China

Hydrogen-bonded polymer complex fiber of poly(ethylene oxide)(PEO)and poly(acrylic acid)(PAA)shows rubber elasticity in ambient environment,but the fiber has relatively low strength and weak *** apply the catechol chemistry and metal coordination to stabilize and strengthen the PEO/PAA *** is grafted with dopamine(Dopa),and then combines with PEO to prepare ***-Dopa in the fiber is crosslinked through oxidation induced dismutation and the metal ions are introduced through *** cross-linking and coordination greatly improve the stability of the fiber against the erosion of alkaline *** four different metal coordination fibers,PEO/PAA-Dopa/Cu fiber keeps the excellent extensibility(~1000%)and presents much higher initial modulus(~7 MPa),ultimate strength(~20 MPa),and toughness(~60 MJ/m^(3))than its precursor PEO/PAA *** addition,PEO/PAA-Dopa/Cu fiber shows quick recovery and large energy dissipation ratio compared with the PEO/PAA *** distinct mechanical properties enhancement of the hydrogen-bonded complex fiber is attributed to the synergy of hydrogen bonds,coordination and covalent bond cross-linking.

关键词： elastic fiber Hydrogen-bonded complexation Catechol chemistry Coordination Elastomer

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elastic fiber regeneration in vitro and in vivo for treatment of experimental abdominal aortic aneurysm

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Chinese Medical Journal 2013年第3期126卷 437-441页

作者： XIONG Jiang GUO Wei WEI Ren ZUO Shang-wei LIU Xiao-ping ZHANG Tao Department of Vascular and Endovascular Surgery Vascular Surgery Center of People's Liberation Army Chinese People's Liberation Army General Hospital Beijing 100853 China

Background The pathological characteristics of abdominal aortic aneurysm （AAA） involved the regression of extracellular matrix （ECM） in aortic walls, especially elastic structure in medial layer. As the major structural protein of aorta, elastin contributes to the extensibility and elastic recoil of the vessels. We hypothesized that overexpression of elastin in vessel walls might regenerate the elastic structure of ECM, restore the elastic structure of the aneurysmal wall, and eventually lead to a reduction of aortic diameters （ADs） in an experimental model of AAA. Methods Tropoelastin （TE） of Sprague Dawley （SD） rat was synthesized by reverse transcription polymerase chain reaction and used to construct adneviral vectors containing elastin precursor protein （AdTE-GFP）. Cultured vascular smooth muscle cells （VSMCs） from aortas of male SD rats were transfected with AdTE-GFP, AdGFP, adenoviral vector （AdNull）, and phosphate buffered saline （PBS）. Immunofluorescence staining was performed to determine the expression of elastin in transfected cells. The expression of elastic fibers in ECM of VSMCs transfected with AdTE-GFP were detected by fluorescence microscopy and transmission electron microscopy （TEM） at 1, 3, and 5 days following gene transfer. The AAA vessel walls were infused with AdTE-GFP or an empty AdNull, or PBS directly into the aneurysmal lumen. ADs of the aneurysms were compared in infused aortas. Formation of new elastic fibers in vivo was assessed by hematoxylin and eosin, and elastic von-Giesson staining. Recombinant elastin-GFP in vivo was identified by immunohistochemical staining. Results elastic fibers were increased both in ECM of VSMC and in vessel walls after gene transfer. Histological studies revealed that the AdTE-GFP-transduced aortas had elastic fiber regeneration in the aneurysmal walls. The AdTE-GFP-transduced aortas showed a decreased AD （23.04%±14.49%, P 〈0.01） in AAA vessel walls. Conclusions elastic fibers have been successfully overex

关键词： abdominal aortic aneurysm elastic fiber adenovirus animal model vascular smooth muscle cell ultr astructure

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Super‑elastic Scintillating fibers and Fabrics for Efficient and Visual Radiation Detection

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Advanced fiber Materials 2023年第4期5卷 1493-1504页

作者： Minghui Du Jin Wang Sijia Xu Hongwei Li Zhihao Zhang Yankun Qi Shichao Lv Jianrong Qiu Yurong Yan Shifeng Zhou State Key Laboratory of Luminescent Materials and Devices School of Materials Science and EngineeringSouth China University of TechnologyGuangzhou 510641China Institute of Photonics Technology Jinan UniversityGuangzhou 510632China National Engineering Research Center of Novel Equipment for Polymer Processing School of Mechanical and Automotive EngineeringSouth China University of TechnologyGuangzhou 510641China Key Lab Guangdong High Property&Functional Polymer Materials School of Materials Science and EngineeringSouth China University of TechnologyGuangzhou 510641China Guangdong Provincial Key Laboratory of fiber Laser Materials and Applied Techniques Guangdong Engineering Technology Research and Development Center of Special Optical Fiber Materials and DevicesGuangzhou 510641China College of Optical Science and Engineering State Key Laboratory of Modern Optical InstrumentationZhejiang UniversityHangzhou 310027China

The fabrication of advanced radiation detectors is an important subject due to the wide use of radiation sources in scientific instruments,medical services,security check,non-destructive inspection,and nuclear ***,the manufacture of flexible and stretchable radiation detectors remains a ***,we report the scalable fabrication of super-elastic scintillating fibers and fabrics for visual radiation detection by thermal drawing and melt-spinning methods using styrene-b-(ethylene-co-butylene)-b-styrene,and scintillating Gd_(2)O_(2)S:Tb(GOS).Microstructure evolution,rheological properties,and radiation-composite interaction are studied to reveal the excellent processability,elasticity,and radiation detection ability of the fabricated *** from the physical crosslinking structural features of the polymer matrix and the excellent radiation absorption capacities of GOS,the resulting fiber can sustain high strains of 765%with a high content of GOS dopants(2 wt.%)and has excellent X-ray detection performance with the limit down to 53 nGy_(air)s^(-1).Furthermore,stretchable fabrics are constructed,and their applications in various fields,such as radiation warning,and X-ray imaging,are *** work not only provides a new type of super-elastic scintillating fibers and fabrics for smart textiles but also demonstrates their potential applications in the nuclear field.

关键词： elastic fiber Radiation detection Optical materials X-ray imaging

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Prednisone Combined with Interferon for the Treatment of One Case of Generalized Granulomatous Slack Skin

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Journal of Huazhong University of Science and Technology(Medical Sciences) 2005年第5期25卷 617-618页

作者：刘志香黄长征李家文 Department of Dermatology Union Hospital Tongji Medical College Huazhong University of Science and Technology Wuhan 430022 China

Granulomatous slackskin （GSS） is a very rare variant of mycosis fungoides （MF）. The lesional skin often manifests with red patches firstly, and develops into nodules and tumors gradually. The skin at the crapy sit... 详细信息

关键词： elastic fiber Multinucleated Giant Cell Mycosis Fungoides Angiomyolipoma Hard Consistency

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