Self adhesive tapes - Measurement of breaking strength and elongation at break

2019 ◽  
Keyword(s):  
Breaking Strength ◽  
Elongation At Break

Biomimetic Hemocompatible Nanofibrous Scaffolds as Potential Small-Diameter Blood Vessels by Bilayering Electrospun Technique

2011 ◽  
Vol 306-307 ◽  
pp. 1627-1630 ◽  
Author(s):  
He Yun Wang ◽  
Ya Kai Feng ◽  
Hai Yang Zhao ◽  
Ruo Fang Xiao ◽  
Jin Tang Guo
Keyword(s):  
Mechanical Properties ◽  
Blood Vessel ◽  
Breaking Strength ◽  
Small Diameter ◽  
Matrix Structure ◽  
Complex Matrix ◽  
Elongation At Break ◽  
Artificial Blood ◽  
Nanofibrous Scaffolds ◽  
Morphology And Mechanical Properties

In this paper, we prepared a scaffold composed of a polyurethane (PU) fibrous outside-layer and a gelatin-heparin fibrous inner-layer with mimicking morphology and mechanical properties of a native blood vessel by sequential bilayering electrospinning technology on a rotating mandrel-type collector. The scaffolds achieved the appropriate breaking strength (3.7 ± 0.13 MPa) and elongation at break (110 ± 8%). When the scaffolds were immersed in water for 1 h, the breaking strength decreased slightly to 2.2 ± 0.3 MPa, but the elongation at break increased up to 145 ± 21%. Heparin was released from the scaffolds at substantially uniform rate until the 9th day. The scaffolds were expected to mimic the complex matrix structure of native arteries, and had good hemocompatibility as an artificial blood vessel owing to the heparin release.

Effects of electron beam irradiation on structure and properties of ultra-high molecular weight polyethylene fiber

2017 ◽  
Vol 47 (6) ◽  
pp. 1357-1377 ◽  
Author(s):  
Dongliang Dai ◽  
Meiwu Shi
Keyword(s):  
Molecular Weight ◽  
Electron Beam ◽  
High Molecular Weight ◽  
Electron Beam Irradiation ◽  
Breaking Strength ◽  
Beam Irradiation ◽  
Elongation At Break ◽  
Gel Content ◽  
Ultra High Molecular Weight ◽  
Polyethylene Fibers

This study introduced trimethylolpropane trimethacrylate into ultra-high molecular weight polyethylene fibers through supercritical CO2 pretreatment before the fibers were irradiated under an electron beam. Significant differences, emerging in the ultra-high molecular weight polyethylene fibers’ gel content, mechanical properties, and creep property according to their different irradiation doses, were studied through one-way analysis of variance. Regression equations were established between the irradiation dose and the gel content, breaking strength, elongation at break, and creep rate by regression analysis. A reasonable irradiation dosage range was determined after a verification experiment and the impact trends were analyzed; additionally, the sensitized irradiation crosslinking mechanism of ultra-high molecular weight polyethylene fibers was preliminarily examined. Then the surface morphology, chemical structures, thermal properties, and crystal properties of treated ultra-high molecular weight polyethylene fibers were measured. The results showed that as the irradiation dose increased, the gel content first rose and then declined; the breaking strength decreased continuously; the elongation at break increased at first and then decreased; and the creep rate originally fell and then rose before finally declining slowly. Electron beam irradiation had a significant etching effect on the fibers’ surface, and both the melting point and crystallinity decreased slightly.

The Effect of Drawing Process on the Properties of Split-Film PTFE Fiber

2012 ◽  
Vol 602-604 ◽  
pp. 1946-1950 ◽  
Author(s):  
Xin Min Hao ◽  
Yuan Yang ◽  
Bin Xiang Huang ◽  
Lei Huang ◽  
Guo Jun Zhang
Keyword(s):  
Mechanical Properties ◽  
Draw Ratio ◽  
Breaking Strength ◽  
Three Dimensional ◽  
Drawing Process ◽  
Heat Setting ◽  
Elongation At Break ◽  
Ptfe Membrane ◽  
Hot Drawing ◽  
Temperature Controlled

From PTFE baseband prepared by three-dimensional drawing, after the processing of different temperature and time. And then by twisting, hot drawing and heat setting, the PTFE filament was prepared in appropriate tension conditions. The surface morphology of the resulting filaments was observed by SEM, the result shows that the uniformity of the PTFE membrane has been improved by using three-dimensional drawing process, hot drawing processes had a great effect upon the breaking strength and elongation at break of PTFE fibers. In order to keep ensure reasonable mechanical properties, the draw ratio in the range of 20 to 50 times to adjust the temperature controlled at 150°C to 300 °C.

Analysis and Research of PPTA Erosion of the Ultrasonication

2011 ◽  
Vol 239-242 ◽  
pp. 314-317
Author(s):  
Zheng Feng Zhu ◽  
Da Peng Qi ◽  
Jun Hua Wang ◽  
Qian Han ◽  
Li Li Cai
Keyword(s):  
Mechanical Property ◽  
Infrared Spectrum ◽  
Kinetic Theory ◽  
Breaking Strength ◽  
Weak Link ◽  
Degree Of Polymerization ◽  
Distilled Water ◽  
Elongation At Break ◽  
Molecular Kinetic Theory

PPTA fibers made by China ShenMa Group Co., Ltd and Kevlar49 fibers made by Dupont as experimental materials were used in this paper. The differences of molecule structures were contrasted through infrared spectrum and degree of polymerization-counting by the detections of viscosity. The PPTA fibers were put into distilled water and seawater made by ourselves respectively, then ultrasonication were used to deal with them. After this, using the SEM to observe, found that the cracks appear on the fibers surfaces, presented the fibrillation and plush-like microfine fibers. Meanwhile the strength weak-link increased and breaking strength and elongation at break of fibers lowered after ultrasonication. Molecular kinetic theory was used in this paper to study loss of fibers the mechanical property.

Durability and Aesthetic Properties of Kenaf/Cotton Blend Fabrics

1997 ◽  
Vol 67 (11) ◽  
pp. 803-808 ◽  
Author(s):  
Gita N. Ramaswamy ◽  
Elizabeth P. Easter
Keyword(s):  
Breaking Strength ◽  
Value Added ◽  
Elongation At Break ◽  
Performance Requirements ◽  
Significant Difference ◽  
End Use ◽  
Kenaf Fibers ◽  
Better Than ◽  
Thread Count ◽  
Made In

To evaluate the serviceability of a new textile product made of an unconventional fiber blend, it is important to determine if the fabric meets the specific standards required for the intended end-use. The value-added textile products of interest are fabrics made of 50/50 kenaf/cotton in the filling direction and 100% cotton in the warp direction, made in sateen, plain, twill, and oxford weaves. The control fabrics are of 100% cotton in only the plain and sateen weaves. The fabrics are characterized and compared based on ten of the most common fabric properties that affect their performance in everyday use: thread count, thickness, weight, breaking strength and elongation, dimensional stability, wrinkle recovery, abrasion resistance, tear strength, staining and stain release, and pilling resistance. Breaking strength of the experimental fabrics compares well with the control fabrics. Elongation at break is greater in the warp direction (19–35%) than in the filling direction (11–15%), but this difference is not significant. Wrinkle recovery for both fabrics is the same and improves over time. Shrinkage is identical in both fabrics. There is no significant difference in the stiffness of the two fabrics, possibly due to the carding step where kenaf fibers are carded to resemble cotton fibers. Abrasion and pilling resistance are good to excellent. Tear resistance is lower for the experimental fabrics compared with the controls, but it does pass the requirements for both upholstery and apparel fabrics. Kenaf/cotton blends perform the same or better than 100% cotton in their ability to release water-based stains, but the oil stain rates between 3 and 4, indicating a residual stain. Stain resistance can be improved by applying a soil-resistant finish. This study demonstrates that kenaf/cotton blend fabrics meet or exceed the performance requirements for both apparel ( i.e., outer wear items such as barn jackets, hunting vests, overalls, and caps) and upholstery fabrics. Additional advantages of the blend fabrics may be luster, interesting texture, and lightness.

Effect of Gamma Irradiation Crosslinking on PA6 Fibers

2012 ◽  
Vol 476-478 ◽  
pp. 2280-2283
Author(s):  
Shi Feng Zhu ◽  
Mei Wu Shi ◽  
Guo Liang Dai
Keyword(s):  
Gamma Irradiation ◽  
Melting Temperature ◽  
Breaking Strength ◽  
Absorbed Dose ◽  
Onset Temperature ◽  
Structure And Properties ◽  
Elongation At Break ◽  
Irradiation Dosage

Gamma irradiation crosslinking of nylon6 fibers with and without the presence of triallyl cyanurate(TAC) was studied, XRD、DSC、IR and TG were used to analyze the effects of irradiation crosslinking on structure and properties of PA6 fibers. The melt-drip performance of PA6 fibers was improved after irradiation crosslinking. The breaking strength increased first then decreased as a function of absorbed dose, while elongation at break decreased. The melting temperature and crystallinity decreased with increasing the dose. Besides, the onset temperature of degradation fell slightly and the amount of non-volatile residue at 600oC increased as the irradiation dosage increased.

scholarly journals Preparation of CaCO3-SiO2 composite with core-shell structure and its application in silicone rubber

2015 ◽  
Vol 17 (4) ◽  
pp. 128-133 ◽  
Author(s):  
Chenglin Cui ◽  
Hao Ding ◽  
Li Cao ◽  
Daimei Chen
Keyword(s):  
Mechanical Properties ◽  
Silicone Rubber ◽  
Shell Structure ◽  
Breaking Strength ◽  
Core Shell ◽  
Elongation At Break ◽  
Chemistry Method ◽  
Core Shell Structure

Abstract A new CaCO3-SiO2 composite with core-shell structure was successfully prepared by mechano-chemistry method (MCM). SEM and FTIR indicated that SiO2 particles were homogeneously immobilized on the surface of CaCO3. The well dispersion of this CaCO3-SiO2 composite into silicone rubber can not only reduce the usage amount of SiO2, but also improve the mechanical properties of silicone rubber. By the calculation, the theoretical numbers of the SiO2 particles is about 10 times as large as that of CaCO3 particles in the CaCO3-SiO2 composite. Mixing CaCO3-SiO2 composite in silicone rubber can enhance the breaking strength of the silicone rubber about 18% as high as that when mixing the pure SiO2. And the elongation at break is about 14% less than that of adding the pure SiO2 sample.

Structure and Properties of Cotton Grafted Using Trifluoroethyl Methacrylate via ATRP Method

2013 ◽  
Vol 796 ◽  
pp. 364-369
Author(s):  
Shi Wei Li ◽  
Tie Ling Xing ◽  
Zhan Xiong Li ◽  
Guo Qiang Chen
Keyword(s):  
Cotton Fabric ◽  
Breaking Strength ◽  
Water Repellency ◽  
Structure And Properties ◽  
Elongation At Break ◽  
Significant Difference ◽  
Surface Contact Angle ◽  
Ft Ir ◽  
Water Repellence ◽  
Better Than

In this work, cotton was grafted with trifluoroethyl methacrylate (TFEMA) via atom transfer radical polymerization (ATRP) in water aqueous. The appearance of the cotton fabric was characterized with SEM, and SEM of the grafted cotton displayed significant difference from the ungrafted cotton. FT-IR indicated that TFEMA was successfully grafted onto surface of cotton fibers. Surface contact angle test and water repellency rating test showed that the water repellence of the modified cotton fabric were better than the ungrafted cotton fabric. Compared with the ungrafted cotton fabric, the whiteness, air permeability, breaking strength and elongation at break of the grafted cotton fabric decreased slightly. Grafted treatment led to efficient implantation of fluorine atoms on the surface of cotton fabric, this resulted in water repellence without altering the bulk properties of the cotton fabric.

Mechanical Properties of Cotton Yarns Mercerized in Liquid Ammonia and Sodium Hydroxide

1976 ◽  
Vol 46 (12) ◽  
pp. 872-879 ◽  
Author(s):  
M. L. Nelson ◽  
C. B. Hassenboehler ◽  
F. R. Andrews ◽  
A. R. Markezich
Keyword(s):  
Mechanical Properties ◽  
Sodium Hydroxide ◽  
Liquid Ammonia ◽  
Breaking Strength ◽  
Continuous Process ◽  
Elongation At Break ◽  
High Tension ◽  
Initial Modulus ◽  
Cotton Yarns ◽  
Length Changes

Yarns spun from high- and low-maturity cottons were mercerized in liquid ammonia in a continuous process, and in liquid ammonia and sodium hydroxide in skein form under various tensions. Both swelling agents produced similar changes in mechanical properties (breaking strength, tenacity, elongation-at-break, and initial modulus) under comparable conditions. Mercerization under high tension increased breaking strength and tenacity and decreased elongation-at-break. Slack mercerization in caustic resulted in elongations-at-break substantially higher than did ammonia treatment. A major difference between reagents was noted during treatment. When skeins were swollen slack and then restretched, much greater force was required to restretch ammonia-swollen skeins, and they could not be stretched as much as those that were caustic-swollen. Measurements of length changes in yarns during swelling, tensioning, and deswelling gave quantitative data to substantiate this observation. Differences in mechanism of swelling are discussed in relation to these findings.

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