Papers by Keyword: Silk Fiber

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Authors: Xue Qin Cao, Jin Ping Guan, Xin Qin, Chi Wei Li, Hong Wei Gu, Guo Qiang Chen
Abstract: The past decade has been marked by a growing interest in the development and use of ecologically friendly dyes. In this paper, a novel non-azobenzene ligand, (Z)-4-amino-2-(4-carboxyphenyl)-5-(hydroxyimino)-2,5-dihydro-1H-imidazole 3-oxide, was synthesized by the reaction of 3,4-diaminoglyoxime with 4-formylbenzoic acid, and characterized by IR, 1H-NMR and MS. The values of the 1H-NMR spectral results were in harmony with previously reported (Z)-4-amino-5-(hydroxyimino)-2,5-dihydro-1H-imidazole 3-oxide derivatives. Its brown ferrous complex has been prepared conveniently and applied to dye silk fabric. From the IR spectra of the complex, the stretching vibration for the ring of imidazole was disappeared, and the C=N absorption was lower than that of the ligand, which indicated that the N,N-chelate coordination bond was formed and the participation of the C=N-OH group in metal coordination. The colour fastness values of the dyed silk fabric to light, washing and rubbing were measured. The washing fastness of dyed silk fabric can reach 4 grade or 4-5 grade; the rub fastness 3-5 grade; the light fastness 3 grade.
Authors: Akari Takeuchi, Chikara Ohtsuki, Toshiki Miyazaki, Shinichi Ogata, Masao Tanihara, H. Tanaka, Yoshiaki Furutani, Hisao Kinoshita
Authors: Mansur Ahmed, Md. Saiful Islam, Qumrul Ahsan, Md Mainul Islam
Abstract: Natural fibres offer a number of benefits as reinforcement for synthetic polymers since they have high specific strength and stiffness, high impact strength, biodegradability etc. The aim of this study is to fabricate and determine the performance of unidirectional silk fibre reinforced polymer composites. In the present initial study, alkali treated silk fibres were incorporated as reinforcing agent, while a mixture of 20% maleic anhydride grafted polypropylene (MAPP) and commercial grade polypropylene (PP) was used as matrix element. The unidirectional composites were fabricated by using hot compression machine under specific pressure, temperature and varying fibre loading. Tensile, flexural, impact and hardness tests were carried out by varying silk fibre volume fraction. Composites containing 45% fibre volume fraction had higher tensile and flexural strength, Young’s modulus and flexural modulus compared to other fabricated composites including those with untreated silk fibres. SEM micrographs were taken to examine composite fracture surface and interfacial adhesion between silk fibre and the matrix. These micrographs suggested less fibre pull out and better interfacial bonding for 40% fibre reinforced composites.
Authors: Hun Sik Kim, Byung Hyun Park, Jin San Yoon, Hyoung Joon Jin
Abstract: Biodegradable composites consisting of poly(butylene succinate) (PBS) and carbon nanotube (CNT)-coated silk (Bombxy mori) fibers were prepared by melt compression molding. The results show that even with addition of a small amount of reinforcements (about 3 wt%), the tensile strength and modulus of the composites improved dramatically by about 195% and 121%, respectively, compared with PBS. The improvement is attributed to stronger interfacial shear strength between the PBS matrix and the CNT-coated surface of silk fiber, which was obtained by the microbond droplet test between PBS matrix and fibers. Furthermore, scanning electron microscopy images indicated that the interfacial adhesion between PBS matrix and CNT-coated fiber improved in the composites.
Authors: Jing Wang, Q.Z. Sun, Jing Gao, D.M. Liu, Xiang Cai Meng, Mu Qin Li
Abstract: Silk fibers were introduced into hydroxyapatite(HA)/chitosan(CS) matrix to prepare scaffold materials of bone tissue engineering with the adequate initial strength and improved cellular affinity using combination of in situ synthesis and freeze-drying technique. Chemical component was investigated using X rays diffraction (XRD) and Fourier transform infrared spectrum (FTIR). Structure and morphology of the composites were observed by scanning electron microscope (SEM). Porosity was tested by liquid substitution method. The mechanical properties of the composites were also measured. The simulated body fluid (SBF) and the cell culture experiments were conducted to assess biological properties of the composites. Results show that the composites with a pore size of 100~250μm have a porosity of 75%~90%and the maximum compressive strength of 5.7 MPa. The compressive strength of the composite is greatly improved in comparison with that of HA/CS matrix (4.6 MPa). In the SBF tests, a layer of randomly oriented apatite crystals form on the scaffold surface after sample immersion in SBF. The cell culture experiments show that the osteoblast cells are attached and proliferated on the surface of the composite, which suggests good bioactivity and cellular compatibility of the composite material. It is concluded that the composites have a promising prospect as bone tissue engineering materials.
Authors: Wei Lu, Xiao Ming Yang
Abstract: Based on researches, silk fabrics have certain health and medical functions. This thesis discusses the different fibers’ structures, and showed that human’s comfort of silk fabric depend on the structural features and hygroscopicity of silk fiber. Also this thesis explores the anti-bacterium and thermal conductivity of silk fiber. The comfortable health functions of silk fabric are based on natural properties of silk fiber.
Authors: Wei Wei Yao, Zhi Wu Liu, Hong Gen Yi, Jian Nan Wang
Abstract: An attempt to change the structure of silk fibers and their properties for the biological application was studied by utilizing gamma radiation in various Co60 intensities (0 kGy, 30 kGy, 50 kGy, 100 kGy, 200 kGy, 500 kGy, 1000 kGy, 2000 kGy, 3000 kGy). With the increase of the gamma radiation intensity, SEM result shows that cracks and fragments were formed between microfibrils of the irradiated fiber significantly. Simultaneously SDS-PAGE results give the evidence that the molecular weight of the fibroin diminished. Furthermore, the breaking strength and elongation of irradiated fibers decreased gradually with the increasing Co60 intensity. Although no significant changes of the molecular conformations were found by FTIR and X-ray diffraction, the effects on molecular interactions of the silk fibroin, such as peptide bonding, hydrogen bond and intermolecular bonding force, were obviously observed and enhanced gradually with the increase of gamma radiation intensity.
Authors: T.M. Mruthyunjaya Swamy, Manjula Koregala Sidde Gowda, Siddaramaiah, Joong Hee Lee
Abstract: Composites of silk fibre reinforced chain extended polyurethane (CEPU) was synthesized by the reaction of castor oil with different diisocyanates and glutaric acid as chain extender. The effect of incorporation of silk fibre into neat CEPU on the physico- mechanical properties and thermal behaviours (TGA and DMA) has been investigated. The incorporation of silk fibre into CEPUs resulted in an enhancement of tensile strength and Tg. The effects of biological fluids and salt solution on swelling behavior of CEPU biocomposites were reported. Key words: Castor oil, silk fibre, composites, polyurethane, DMA, TGA.
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