Characters alteration of SBR via compounding with ultrasonically and mechanochemically devulcanized rubber influenced by gamma irradiation in presence of polyester fibers

2021 ◽  
Author(s):  
Mona Y. Elnaggar ◽  
E. S. Fathy ◽  
Raouf Okasha
Keyword(s):  
Gamma Irradiation ◽  
Polyester Fibers ◽  
Devulcanized Rubber

Polarized microbeam FT-IR analysis of single fibers

1996 ◽  
Vol 54 ◽  
pp. 206-207
Author(s):  
Liling Cho ◽  
David L. Wetzel
Keyword(s):  
Molecular Orientation ◽  
Transition Point ◽  
Polymer Fibers ◽  
Single Fiber ◽  
Wire Grid ◽  
Polyester Fibers ◽  
Ft Ir ◽  
Ir Analysis ◽  
The Relationship ◽  
Wire Grid Polarizer

Polarized infrared microscopy has been used for forensic purposes to differentiate among polymer fibers. Dichroism can be used to compare and discriminate between different polyester fibers, including those composed of polyethylene terephthalate that are frequently encountered during criminal casework. In the fiber manufacturering process, fibers are drawn to develop molecular orientation and crystallinity. Macromolecular chains are oriented with respect to the long axis of the fiber. It is desirable to determine the relationship between the molecular orientation and stretching properties. This is particularly useful on a single fiber basis. Polarized spectroscopic differences observed from a single fiber are proposed to reveal the extent of molecular orientation within that single fiber. In the work presented, we compared the dichroic ratio between unstretched and stretched polyester fibers, and the transition point between the two forms of the same fiber. These techniques were applied to different polyester fibers. A fiber stretching device was fabricated for use on the instrument (IRμs, Spectra-Tech) stage. Tension was applied with a micrometer screw until a “neck” was produced in the stretched fiber. Spectra were obtained from an area of 24×48 μm. A wire-grid polarizer was used between the source and the sample.

Thermoluminescence properties of micro and nano structure hydroxyapatite after gamma irradiation

Kerntechnik ◽  
2016 ◽  
Vol 81 (6) ◽  
pp. 651-654 ◽  
Author(s):  
M. Shafaei ◽  
F. Ziaie ◽  
N. Hajiloo
Keyword(s):  
Gamma Irradiation ◽  
Nano Structure

THE EFFECT OF GAMMA STERILIZATION AND ITS EFFECT ON MICROSCOPIC STRUCTURE OF DEEP FROZEN DOG SKULL

2018 ◽  
pp. 37-40
Author(s):  
Phuong Thao Tien Nguyen ◽  
Anh Hung Tran ◽  
Van Tam Le ◽  
Huu Thao Phung ◽  
Phan Quynh Anh Nguyen
Keyword(s):  
Structural Change ◽  
Gamma Radiation ◽  
Gamma Irradiation ◽  
Key Words ◽  
Bone Matrix ◽  
Infected Tissue ◽  
Microscopic Structure ◽  
Bacteriological Examination ◽  
Microscopic Scale

Objective: To evaluate the effect of gamma sterilization and its effect on microscopic structure of deeply frozen dog skull. Subjects and methods: 50 pairs of dog skull fragments have the same size,which were taken symmetrically through the midline of the skull, were divided into two lots. Evident lot consisting of 50 pieces are just deeply frozen, not irradicated. Experimental lot which was composed of 50 pieces were deeply frozen and exposed to 25kGy of gamma radiation. Afterwards, to evaluate the effect of gamma sterilization and compare the alter of bone matrix between lot groups. Results: After gamma irradiation, all dog skull fragments were negative with bacteriological examination. In microscopic scale, no difference was found between the two lots and there was no structural change in the irradiated fragments of all dog skull. Conclusion: Gamma irradiation with 25 kGy: (i) It has the ability to kill bacteria completely in the type of bacteria commonly infected tissue. (ii) It does not alter the structure of dog skull in microstructures. Key words: dog skull, gamma, sterilize

Changes of Allergenicity and Conformational Structure of Egg Ovomucoid by Gamma Irradiation in the Basic Condition

2002 ◽  
Vol 7 (1) ◽  
pp. 52-56 ◽  
Author(s):  
Kun-Og Kang ◽  
Ju-Woon Lee ◽  
Cheo-Run Jo ◽  
Hong-Sun Yook ◽  
Myung-Woo Byun
Keyword(s):  
Gamma Irradiation ◽  
Conformational Structure
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