Structure and Properties of Porous Bulked Tussah Silk and its Product

2013 ◽  
Vol 796 ◽  
pp. 172-175
Author(s):  
Tie Ling Xing ◽  
Jia Yong Sheng ◽  
Guo Qiang Chen ◽  
Yong Fa Yang ◽  
Ya Guang Liu
Keyword(s):  
Elastic Recovery ◽  
High Tech ◽  
Structure And Properties ◽  
Silk Fibers ◽  
High Elasticity ◽  
Physical Processing ◽  
Recovery Percentage ◽  
Degumming Process ◽  
Warm Clothing ◽  
Better Than

Tussah silk is a special product of China, which has luxury, ecological and health care advantages. Tussah silk is particularly suitable for the production of silk quilt, silk blanket, warm clothing and other products. In this work, porous bulked tussah silk fibers could be obtained through high temperature, high pressure, steaming explosion and puffing physical processing high-tech without any chemicals and assistants during degumming process. The surface morphology, size, porosity and mechanical property of the porous bulked tussah silk fibers were studied and compared with the ordinary tussah silk fibers. SEM results indicated that the bulked tussah silk fibers had porous structure. And the porous bulked tussah silk had higher elasticity and softness than the ordinary tussah silk fibers. Porous bulked and high elasticity tussah silk quit was produced from the ecotype porous bulked tussah silk fibers. The wearability of porous bulked tussah silk quilt was also investigated. The results showed that the insulating property, elastic recovery percentage and bulkiness of the porous bulked tussah silk quilt were all better than those of the ordinary silk quilt. As a result of the high resilience and flexibility of porous bulked tussah silk, the tussah quilt can effectively prevent the tangles and clumping of the silk fibers and is durable.

Computing cell tractions from particle displacements on silicone rubber substrata

1994 ◽  
Vol 52 ◽  
pp. 162-163
Author(s):  
Tim Oliver ◽  
Akira Ishihara ◽  
Ken Jacobsen ◽  
Micah Dembo
Keyword(s):  
Plane Stress ◽  
Linear Elasticity ◽  
Silicone Rubber ◽  
Mathematical Analysis ◽  
Elastic Recovery ◽  
Video Images ◽  
Cell Traction Forces ◽  
Latex Beads ◽  
Cell Traction ◽  
Better Than

In order to better understand the distribution of cell traction forces generated by rapidly locomoting cells, we have applied a mathematical analysis to our modified silicone rubber traction assay, based on the plane stress Green’s function of linear elasticity. To achieve this, we made crosslinked silicone rubber films into which we incorporated many more latex beads than previously possible (Figs. 1 and 6), using a modified airbrush. These films could be deformed by fish keratocytes, were virtually drift-free, and showed better than a 90% elastic recovery to micromanipulation (data not shown). Video images of cells locomoting on these films were recorded. From a pair of images representing the undisturbed and stressed states of the film, we recorded the cell’s outline and the associated displacements of bead centroids using Image-1 (Fig. 1). Next, using our own software, a mesh of quadrilaterals was plotted (Fig. 2) to represent the cell outline and to superimpose on the outline a traction density distribution. The net displacement of each bead in the film was calculated from centroid data and displayed with the mesh outline (Fig. 3).

Structure and properties of silk fibroin aerogels prepared by non-alkali degumming process

Polymer ◽  
2020 ◽  
Vol 192 ◽  
pp. 122298 ◽  
Author(s):  
Haiwei Yang ◽  
Zongqian Wang ◽  
Mingrong Wang ◽  
Changlong Li
Keyword(s):  
Silk Fibroin ◽  
Structure And Properties ◽  
Degumming Process

Effect of manipulation of milk composition and curd-forming conditions on the formation, structure and properties of milk curd

1987 ◽  
Vol 54 (2) ◽  
pp. 303-313 ◽  
Author(s):  
Margaret L. Green
Keyword(s):  
Environmental Conditions ◽  
Milk Composition ◽  
Protein Network ◽  
Protein Networks ◽  
Structure And Properties ◽  
Coagulation Time ◽  
Cationic Materials ◽  
Concentrated Milk ◽  
Ca Depletion ◽  
Better Than

SummaryMilks whose compositions had been altered by deliberate manipulation or by contact with various environmental conditions relevant to cheesemaking were treated with rennet in such a way as normally to give a constant coagulation time. Rates of curd formation and whey loss, curd structure and fat retention were determined. Ca depletion in concentrated milks reduced firming and syneresis rates and gave curds with finer protein networks. Increased temperature of curd formation increased the curd-firming rate and curd coarseness, but decreased the syneresis rate at 30 °C. Prior treatment of concentrated milk with rennet in the cold gave a much finer protein network which retained fat better than curd formed normally. Despite increasing firming and syneresis rates, acidified milk gave a slightly finer curd with a better fat retention than normal. Addition of cationic materials stimulated aggregation and the curd retained fat better than normal, although the curd structure was unaffected. The results indicate that the processes of firming and syneresis have related mechanisms, and that the curd structure is not simply dependent on curd-forming conditions, but on the number of aggregating particles and the forces between them.

Synthesis and Property of Siloxane and other Modifier Modified Melamine Resin

2013 ◽  
Vol 448-453 ◽  
pp. 111-114
Author(s):  
Xiao Bin Li ◽  
Lu Qi
Keyword(s):  
Infrared Spectroscopy ◽  
Polyethylene Glycol ◽  
Thermogravimetric Analysis ◽  
Polyvinyl Alcohol ◽  
Melamine Resin ◽  
Structure And Properties ◽  
Reaction Conditions ◽  
And Performance ◽  
Better Than

This work reports melamine resin was modified with siloxane, Polyvinyl alcohol (PVA) and polyethylene glycol (PEG) to improve its structure and properties, and accomplished a wide research and study on the effect of different reaction conditions, including temperature, PH and solid contents. Using infrared spectroscopy (FTIR), thermogravimetric analysis (TG) and DSC to analyzed the samples and study their composition and performance. The results showed that siloxane, Polyvinyl alcohol and polyethylene glycol (PEG) modifier can make the performance of the melamine better than unmodified ones.

Methanol Induced Changes in Structure and Properties of Dry Spinning Fibers of Regenerated Silk Fibroin

2011 ◽  
Vol 335-336 ◽  
pp. 908-911
Author(s):  
Yan Long Ma ◽  
Jing Xin Zhu ◽  
Hui Li Shao ◽  
Xue Chao Hu
Keyword(s):  
Random Coil ◽  
Fiber Axis ◽  
Structure And Properties ◽  
Silk Fibers ◽  
Methanol Treatment ◽  
Dry Spinning ◽  
Regenerated Silk Fibroin ◽  
Spun Fiber ◽  
Induced Changes ◽  
Spun Fibers

The as-spun fibers, which be produced by dry spinning technique, were treated with methanol solution. The results showed that the morphology, structure and mechanical properties of the as-spun fibers had changed. Before methanol treatment,the as-spun fiber had a smooth surface, after methanol treatment, the fiber exhibited rough surface and banded features along the fiber axis. The structure of the as-spun fibers changed from random-coil or silk I conformation to silk II conformation and the breaking intensity of the as-spun fibers were improved after methanol treatment. Compared with degummed silk fibers, the fibers treated with methanol had higher module, but the breaking elongation was lower, the fibers were still brittle.

Effect of Preparation Ways on Structure and Properties of Steraric Acid/Na+-Montmorillonite Phase-Change Composite Materials

2012 ◽  
Vol 501 ◽  
pp. 589-592
Author(s):  
Hui Xia Feng ◽  
Han Zheng ◽  
Yi Wang
Keyword(s):  
Phase Change ◽  
The Other ◽  
Fusion Process ◽  
Structure And Properties ◽  
Release Experiment ◽  
Ft Ir ◽  
The Stability ◽  
Change Material ◽  
Scanning Electron ◽  
Better Than

Two different methods, heat fusion process and solution infusion process had been used to synthesize a kind of phase change material (PCM) for latent heat thermal energy storage (LHTES). The composite was composed by steraric acid (SA) and montmorillonite (MMT). The morphology of the SA/MMT was characterized by scanning electron microscope (SEM) and FT-IR. The thermal performance and stability of the composite was characterized by differential thermal scanners (DSC) and heating store/release experiment. The FT-IR results demonstrated the PCMs and MMT combined by only physical bonds, SEM results showed that SA was intercalated in to MMT, and heat fusion process was contribute to the combination better than the other. The heating store/release experiment indicated that the stability of M-SA/MMT is better than S-SA/MMT.

Parametric Study on Wall Springback in Tailor Welded Long Channels

2016 ◽  
Author(s):  
Chetan P. Nikhare
Keyword(s):  
Parametric Study ◽  
Elastic Recovery ◽  
Influencing Factor ◽  
Weld Line ◽  
High Strength ◽  
Back Edge ◽  
High Elasticity ◽  
Large Length ◽  
Tailor Welded Blank ◽  
The Common

The common challenge found in cases of high elasticity or high strength or both property materials after forming is springback. The part unloaded after forming tends to recover elastically and the displacement due to elastic recovery is called springback. In this paper, the 3D channels with large length were deformed numerically and parametric study on the wall springback at different section was predicted. For this purpose tailor welded blank was considered. The geometric change along the long axis was also discussed. In addition the effect of parameters on wall springback was also analyzed. The new division factor was included to normalize the springback based on thickness and strength. It was found that the strength ratio and die and punch radius were the top influencing factor for front edge and weld line springback while thickness ratio was the most affecting parameter for the back edge springback.

scholarly journals Using the Rheological Index to Quantitatively Evaluate the Mechanical Performance of High-Elasticity Modified Asphalt

2021 ◽  
Vol 2021 ◽  
pp. 1-8
Author(s):  
Jiani Wang ◽  
Zhongjun Xue ◽  
Meng Guo ◽  
Shuaixiang Zhang
Keyword(s):  
Modulus Of Elasticity ◽  
Recovery Rate ◽  
Bridge Deck ◽  
Mechanical Performance ◽  
Elastic Recovery ◽  
High Temperature Deformation ◽  
Temperature Deformation ◽  
Modified Asphalt ◽  
Recovery Capacity ◽  
High Elasticity

High-elasticity modified asphalt is widely used in OGFC and bridge deck paving due to its high viscosity and strong displacement recovery capacity. It can improve the high-temperature deformation resistance and elastic recovery ability of the pavement. Especially in bridge deck pavement, high-elastic modified asphalt can inhibit the formation of reflective cracks and extend the service life. In order to quantitatively evaluate properties of the high-elasticity modified asphalt, rheological properties are studied by using a dynamic shear rheometer (DSR) test. The parameters were fitted with the Burgers model, and the constitutive equation was established. The 3 s elastic recovery rate E r was proposed to quantitatively evaluate the elastic recovery of high-elasticity modified asphalt. The experimental results show that the instantaneous modulus of elasticity G 0 and the delayed modulus of elasticity G 1 can be used to evaluate the elastic capacity. E r can quantitatively evaluate the elastic resilience of high-elasticity modified asphalt. The correlation coefficient between the test results of high-elasticity modified asphalt and those of impact toughness evaluation reached 0.9966, and the 3 s elastic recovery rate E r could be used to evaluate the elastic recovery ability of high-elasticity modified asphalt.

Sign in / Sign up

Export Citation Format

Share Document