Preparation of Transparent Water-Insoluble Silk Fibroin Films

2011 ◽  
Vol 175-176 ◽  
pp. 79-84
Author(s):  
Min Qing Luo ◽  
Cen Cen Zhang ◽  
Shen Zhou Lu
Keyword(s):  
Mechanical Properties ◽  
Silk Fibroin ◽  
Light Transmittance ◽  
Human Cornea ◽  
X Ray Diffraction ◽  
X Ray ◽  
Blend Films ◽  
Structure Surface ◽  
Ft Ir ◽  
Transparent Water

The transparent water-insoluble silk fibroin(SF) films were casted from the mixture solution of silk fibroin and xylitol/mannitol. The structure, surface morphology, solubility, mechanical properties and light transmittance of the blend films were measured. FT-IR, X-ray diffraction retuslts indicated that the films were mainly composed of Silk I structure. SEM showed the blend films with xylitol were miscible, whereas the blend films with mannitol had phase-separated structure. There were lots of nanopores in the blend films in the wet state. The insoluble SF /xylitol films had excellent mechanical properties while the SF / mannitol films were brittle. The mechanical property of SF/alcohol blend films were consistent with the human cornea in wet state.When the contents of xylitol were 10% and 20%, the blend films had high light transmittance which were similar to human cornea. In summary, the SF /xylitol film containing 10% xylitol provides a great potential to act as repairing materials for cornea.

Preparation and Mechanical and Optical Properties of SF/Pyrrolidone Blend Film

2015 ◽  
Vol 815 ◽  
pp. 327-331
Author(s):  
Jiao Jiao Li ◽  
Shan Shan Zhang ◽  
Xin Yue Zhang ◽  
Shen Zhou Lu
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Silk Fibroin ◽  
L929 Cell ◽  
Light Transmittance ◽  
X Ray Diffraction ◽  
Elongation At Break ◽  
Blend Film ◽  
Blend Films ◽  
Tensile Tester

To improve the properties of silk fibroin film, the silk fibroin/pyrrolidone blend films were prepared by mixing silk fibroin and pyrrolidone solution at different ratios. The structure and mechanical properties of blend films were characterized. X-ray diffraction was used to investigate structure of the SF/PYR films, and the results indicated that the blend films were composed of the β-sheet form. Tensile strength and elongation at break of blend films were measured using an instron tensile tester. The results showed that tensile strength and elongation at break of blend films were high enough for application. Furthermore, the films’ flexibility was significantly improved. The optical clarity of blend film was tested by Microplate system. It can be seen from the results that optical clarity is not stable, but in some particular ratios we also can get high light transmittance blend films. At last, biocompatibility of blend films (the rate of the blend film is 30%) was accessed with L929 cell. The results showed that all types of blend films were able to support cell adhesion and proliferation. In addition, the cellular morphology of the cells cultured on blend films was better than that on silk fibroin films. In view of the mechanical properties and optical clarity, combined with their ability to support L929 proliferation suggests that this blend films will offer new options in many different biomedical applications.

scholarly journals Enhancement of Chloroprene/Natural/Butadiene Rubber Nanocomposite Properties Using Organoclays and Their Combination with Carbon Black as Fillers

Polymers ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 1085
Author(s):  
Patricia Castaño-Rivera ◽  
Isabel Calle-Holguín ◽  
Johanna Castaño ◽  
Gustavo Cabrera-Barjas ◽  
Karen Galvez-Garrido ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Carbon Black ◽  
High Performance ◽  
Rubber Matrix ◽  
Butadiene Rubber ◽  
X Ray Diffraction ◽  
X Ray ◽  
Rubber Blends ◽  
Ft Ir ◽  
Chloroprene Rubber

Organoclay nanoparticles (Cloisite® C10A, Cloisite® C15) and their combination with carbon black (N330) were studied as fillers in chloroprene/natural/butadiene rubber blends to prepare nanocomposites. The effect of filler type and load on the physical mechanical properties of nanocomposites was determined and correlated with its structure, compatibility and cure properties using Fourier Transformed Infrared (FT-IR), X-ray Diffraction (XRD), Thermogravimetric Analysis (TGA) and rheometric analysis. Physical mechanical properties were improved by organoclays at 5–7 phr. Nanocomposites with organoclays exhibited a remarkable increase up to 46% in abrasion resistance. The improvement in properties was attributed to good organoclay dispersion in the rubber matrix and to the compatibility between them and the chloroprene rubber. Carbon black at a 40 phr load was not the optimal concentration to interact with organoclays. The present study confirmed that organoclays can be a reinforcing filler for high performance applications in rubber nanocomposites.

Preparation of Hydrophobic CaCO3-Wood Composite In Situ

2010 ◽  
Vol 113-116 ◽  
pp. 1712-1715
Author(s):  
Cheng Yu Wang ◽  
Chang Yu Liu ◽  
Jian Li
Keyword(s):  
Mechanical Properties ◽  
Organic Substrate ◽  
Dodecanoic Acid ◽  
Wood Composite ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ft Ir ◽  
Contact Angle Analysis ◽  
Double Diffusive

The preparation of hydrophobic CaCO3-wood composite through a double-diffusive method using dodecanoic acid as organic substrate is demonstrated. The product was characterized by the contact angle analysis, X-ray diffraction (XRD), fourier transform infrared spectroscopy (FT-IR) and scanning electron microscope (SEM). The mechanical properties of the product were measured. The results show that the synthesized CaCO3 fills in the wood cell and covers the surface of wood. The CaCO3-wood composite is hydrophobic. The mechanical properties of wood composite have significantly increased.

Influence of Organoclay on the Physical Properties of Polyethylene Nanocomposites

2006 ◽  
Vol 530-531 ◽  
pp. 709-714 ◽  
Author(s):  
Edcleide Maria Araújo ◽  
Amanda D. de Oliveira ◽  
Renata Barbosa ◽  
Tomás Jefférson Alves de Mélo
Keyword(s):  
Mechanical Properties ◽  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Quaternary Ammonium Salts ◽  
Ammonium Salts ◽  
Clay Nanocomposites ◽  
X Ray Diffraction ◽  
Polyethylene Matrix ◽  
X Ray ◽  
Ft Ir

In this work, polyethylene/montmorillonite clay nanocomposites were produced by melt intercalation. The clays were treated with quaternary ammonium salts and then treated and untreated clays were introduced in polyethylene. The clays were characterized by X-Ray Diffraction (XRD) and Fourier Transform Infrared Spectroscopy (FT-IR). The nanocomposites were characterized by mechanical and flammability properties. The results showed that the mechanical properties were improved by introduction of organoclay in polyethylene matrix. By adding only 3wt% montmorillonite, the burning rate of the nanocomposites was reduced by 17% in relation to PE matrix.

scholarly journals Comparison of Gelation Time and Polyalcohol Effect on Hydrogels from Domestic and Wild Silk Fibroins

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
Huijing Zhao ◽  
Siyong Xiong ◽  
Mingzhong Li ◽  
Qiang Zhang ◽  
Guiyang Liu
Keyword(s):  
Bombyx Mori ◽  
Silk Fibroin ◽  
Gelation Time ◽  
X Ray Diffraction ◽  
Antheraea Pernyi ◽  
X Ray ◽  
Silk Fibroins ◽  
Ft Ir ◽  
Additional Formation ◽  
Ir And Raman

Silk fibroin (SF) hydrogels were obtained from both domestic (Bombyx mori) and wild (Antheraea pernyi) silkworms from aqueous silk fibroin solutions at room temperature. The gelation time of theAntheraea pernyi(A. pernyi) SF solution was significantly shorter than that of theBombyx mori(B. mori) SF solution. The secondary structures of the two kinds of hydrogels were also compared. In order to further reduce the gelation time, various amounts of polyethylene glycol (PEG) were blended with the silk fibroins ofA. pernyiandB. mori. The gelation time of bothA. pernyiSF andB. moriSF decreased with the increased amount of PEG. After freeze-drying, the hydrogels were characterized through X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), and Raman spectroscopy. Results showed that the addition of polyalcohol did not change the main secondary structure of the hydrogels. However, the addition of polyalcohol did reduce the gelation time and triggered additional formation ofβ-sheets.

High Functional Silk Fibroin Polyester Fabric

2011 ◽  
Vol 332-334 ◽  
pp. 799-803
Author(s):  
Gang Xian Zhang ◽  
Nan Han ◽  
Wei Hu ◽  
Feng Xiu Zhang
Keyword(s):  
Silk Fibroin ◽  
Glycidyl Ether ◽  
Polyester Fabric ◽  
Air Permeability ◽  
Sucrose Ester ◽  
X Ray Diffraction ◽  
Softening Function ◽  
X Ray ◽  
Polyester Fibers ◽  
Ft Ir

Though polyester fabric has favorable characteristics, it is not comfortable to wear because of its hydrophobic characteristics Silk fibroin has lots of polar and electric groups, and its biocompatible is very good. In this paper polyester fabric was encased sucrose ester to endue polyester fibers lots of –OH, then sucrose eater glycidyl ether (SEGE) which not only had crosslink function but also had softening function was used to graft silk fibroin on polyester fabric. FT-IR spectra showed silk fibroin was grafted on polyester fabric; DSC showed thermostability of fabric kept very well; X-ray diffraction spectra showed the structure of some silk fibroin grafted on polyester fabric was -sheet. With the increase of grafting rate of silk fibroin on polyester fabric, the broken strength of polyester fabric grafted silk fibroin did not decrease; cockle elastics kept very well; antistatic property and moisture regain increased greatly, whiteness and air permeability kept very well and fabric was still soft enough. The polyester fabric grafted silk fibroin was high functional.

Study on the Properties of the Gelatin Modified Chitosan Films

2012 ◽  
Vol 482-484 ◽  
pp. 863-867 ◽  
Author(s):  
Wei Dong ◽  
Li Jun Qu ◽  
Xiao Qing Guo
Keyword(s):  
Mechanical Properties ◽  
Water Solubility ◽  
Composite Films ◽  
Chitosan Film ◽  
X Ray Diffraction ◽  
Elongation At Break ◽  
X Ray ◽  
Modified Chitosan ◽  
Ft Ir ◽  
Chitosan Films

Abstract: With the purpose to improve the mechanical properties and cut costs of chitosan films, a series of gelatin-chitosan films were prepared. The effect of gelatin content on the mechanical properites of films was studied. FT-IR spectrum and X-ray diffraction analysis showed good compatibility between gelatin and chitosan. The composite films exhibited a higher TS(tensile strengths) and ES(elongation at break) compared with chitosan film, especially when the content of gelatin in blends was 30%. The TS and ES revealed that the interaction between chitosan and gelatin was the strongest when the content of gelatin in blends was 30%. The results obtained from percent water absorption indicated these two biopolymers were high hydrophilicity polymer. The water solubility of composite films was higher than chitosan films. The results suggest that the interactions between gelatin and chitosan was good for the mechanical properties of composite films.

Silk Fibroin/Sodium Alginate Composite Film and Hydroxyapatite Mineralization

2014 ◽  
Vol 787 ◽  
pp. 460-467 ◽  
Author(s):  
Jin Fa Ming ◽  
Xiao Xiao Yue ◽  
Feng Zhang ◽  
Yao Xing Jiang ◽  
Bao Qi Zuo
Keyword(s):  
Fourier Transform ◽  
Sodium Alginate ◽  
Silk Fibroin ◽  
Average Length ◽  
Fourier Transform Infrared ◽  
Infrared Analysis ◽  
Wide Angle ◽  
X Ray Diffraction ◽  
X Ray ◽  
Blend Films

Silk fibroin/sodium alginate blend films and its hydroxyapatite deposition were prepared and characterized by scanning electron microscopy, wide angle X-ray diffraction, Fourier transform infrared analysis, and thermal analysis. The surface of blend films showed much more rod-like structure dispersing uniformity and its average length increasing from 181 to 803nm with increasing the contents of sodium alginate. The crystal structure of silk fibroin and the compatibility of the two components were associated with the content of sodium alginate in silk fibroin/sodium alginate blend films. The silk I and silk II crystal structures of silk fibroin were co-existed in the blend films and a rather complex conformation transition occurred, which was confirmed by wide angle X-ray diffraction and Fourier transform infrared analysis. Thermal behavior of blend films was interrupted by adding different contents of sodium alginate. Adding 30.0% sodium alginate or more, the endothermic peak of moisture evaporation shifted downward from 111 to 80°C, and the degradation peaks at 243 and 279°C, respectively, indicating an obviously two phase structure in the blend films. In addition, the rod-like HAp crystals were grown on the surface of blend films. This result may provide some new ideas in the design and fabrication of new materials through the silk fibroin/sodium alginate composite materials template for the hydroxyapatite crystal growth.

scholarly journals Modification of Low-Density Slag Cementing Slurry with SiC Whiskers at High Temperature

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Hongqiong Fu ◽  
Xiaoyang Guo ◽  
Ping Zhou ◽  
Ping Yan ◽  
Youzhi Zheng ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
High Temperatures ◽  
Test Results ◽  
X Ray Diffraction ◽  
Mass Percentage ◽  
X Ray ◽  
Sic Whiskers ◽  
Ft Ir ◽  
Further Development ◽  
Solidified Body

The aim of this study was to improve the mechanical properties of a slag solidified body at high temperatures. Composite materials with different contents of SiC whiskers were prepared and characterized using techniques such as mechanical testing, scanning electron microscopy (SEM), X-ray diffraction (XRD), thermogravimetric analysis (TGA), and Fourier transform infrared spectroscopy (FT-IR). When the SiC whisker addition is 1% mass percentage, the compressive and tensile strength of the slag solidified body after hydration for 7 days increased by 10.2% and 39.3%, respectively, and Young’s modulus decreased by 16.8%. The results show that the addition of SiC whiskers can enhance the mechanical properties of solidified slag bodies at high temperatures. According to the test results, the hydration products of the slag solidified body mainly consist of honeycomb tobermorite (C-S-H) gel at high temperatures in addition to a small number of spherical products. The spheres are connected to form a dense structure; however, noticeable cracks were present. The addition of SiC whiskers effectively inhibited the initiation and further development of microcracks and improved the bearing capacity of the slag solidified body.

scholarly journals Investigation of the Thermo-Mechanical Properties of Blend Films Based on Hemicelluloses and Cellulose

2018 ◽  
Vol 2018 ◽  
pp. 1-10
Author(s):  
Hui Gao ◽  
Jun Rao ◽  
Ying Guan ◽  
Wen-qi Li ◽  
Mao-chao Zhang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Testing ◽  
Electrostatic Interactions ◽  
X Ray Diffraction ◽  
X Ray ◽  
Blend Films ◽  
Structural Relationships ◽  
Structures And Properties ◽  
Convenient Approach ◽  
Hydrogen Bondings

This study presents an effective and convenient approach to prepare blend films with enhanced mechanical and thermodynamic properties by incorporation of carboxymethyl cellulose (CMC) into quaternized hemicelluloses (QH). The structures and properties of films were analyzed by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), and tensile testing, respectively. From the SEM pictures, tight, homogeneous, and smooth surfaces of films were obtained. In addition, the transparencies of the blend films were increased with the increasing of CMC content. The results of mechanical properties indicated that the blend film prepared from QH and CMC (1 : 2 m/m) had a tensile strength of 65.2 MPa. It suggested that the addition of CMC was contributed to mechanical properties by strong electrostatic interactions and the enhanced hydrogen bondings with QH. These results provide insights into the understanding of the structural relationships of bioblend films in coating and packaging application.

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