The effect of degree of polymerization on the structure and properties of polyvinyl alcohol fibers with high strength and high modulus

2020 ◽  
Vol 138 (10) ◽  
pp. 49971
Author(s):  
Xinqiu Hong ◽  
Yongjing Xu ◽  
Liming Zou ◽  
Yan Vivian Li ◽  
Junwei He ◽  
...  
Keyword(s):  
Polyvinyl Alcohol ◽  
High Strength ◽  
Degree Of Polymerization ◽  
Structure And Properties ◽  
High Modulus

INFLUENCE OF CONDITIONS OF STRETCHING AND GAS MEDIA UNDER GRAPHITATION ON CRYSTALLINE STRUCTURE AND PROPERTIES OF HIGH-MODULUS CARBON FIBERS BASED ON POLYACRYLONITRILE

1970 ◽  
Vol 61 (11) ◽  
Author(s):  
Dmitry B. Verbets ◽  
Vladimir M. Samoylov ◽  
Leonid M. Buchnev ◽  
Anastasiya V. Nakhodnova ◽  
Igor A. Bubnenkov ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Raman Spectroscopy ◽  
Carbon Fibers ◽  
Modulus Of Elasticity ◽  
High Strength ◽  
Interlayer Distance ◽  
Structure And Properties ◽  
High Modulus ◽  
Stretching Ratio ◽  
Graphitization Temperature

The effect of stretching ratio and the gaseous medium on graphitization on the crystal structure and properties of high-modulus carbon fibers (CFs) based on polyacrylonitrile was studied. It is shown that an increase in the degree of stretching ratio to 8-10.5% of the initial high-strength CFs at a temperature of 3000 °С leads to a decrease in the tensile strength and an increase in the modulus of elasticity CFs. The use of a halogen-hydrocarbons containing medium at a graphitization temperature of 2500 °C did not lead to a decrease in the strength of the obtained CFs, but led to a significant increase in the modulus of elasticity CFs up to 59%. The crystal structure of the obtained CFs was studied by X-ray structural analysis and Raman spectroscopy. It is shown that with an increase in stretching ratio up to 8%, a decrease in the interlayer distance d002, an increase in the height Lc, and the diameter of the La crystallites are observed. Raman spectroscopy showed that the ID/IG parameter (the ratio of the integrated intensities of the spectral bands D and G) decreases, which also corresponds to an increase in the degree of perfection of the CFs crystal structure. The diffraction pattern shows the effect of a halogen-hydrocarbons containing medium at a graphitization temperature of 2500 °C on the CFs crystal structure: a decrease in the half-width of the 002 peak is observed, although the interlayer distance does not decrease, and the ratio of the ID/IG spectral intensities is observed on the Raman spectrum, which confirms a higher degree of crystalline structures for CFs that have undergone graphitization in a halogen- hydrocarbons containing medium.

RMI 6Al-2Sn-2Zr-2Mo-0.15Si

Alloy Digest ◽  
2001 ◽  
Vol 50 (9) ◽  
Keyword(s):  
Fracture Toughness ◽  
High Temperature ◽  
Physical Properties ◽  
Tensile Properties ◽  
High Strength ◽  
Bend Strength ◽  
High Modulus ◽  
Temperature Performance ◽  
Heavy Section

Abstract Ti-6Al-2Sn-2Zr-2Mo-0.05Si alloy is used as heavy section forgings that require high strength, fracture toughness, and high modulus. It is used as forgings and sheet for air frames. This datasheet provides information on composition, physical properties, elasticity, tensile properties, and bend strength as well as fracture toughness and creep. It also includes information on high temperature performance as well as joining. Filing Code: TI-119. Producer or source: RMI Company.

Influence of low-temperature tempering on structure and properties of welded joints of high-strength steel 30Kh2N2MF

2020 ◽  
Vol 2020 (6) ◽  
pp. 20-26
Author(s):  
O.A. Gaivoronskyi ◽  
◽  
V.D. Poznyakov ◽  
O.M. Berdnikova ◽  
T.O. Alekseenko ◽  
...  
Keyword(s):  
Low Temperature ◽  
Welded Joints ◽  
High Strength Steel ◽  
High Strength ◽  
Structure And Properties

Promising hybrid fabrics based on carbon and aramid fibers as a reinforcing filler for polymer composites

2019 ◽  
pp. 86-95 ◽  
Author(s):  
G. F. Zhelezina ◽  
V. G. Bova ◽  
S. I. Voinov ◽  
A. Ch. Kan
Keyword(s):  
Composite Material ◽  
Polymer Composites ◽  
Carbon Fibers ◽  
Mechanical Characteristics ◽  
High Strength ◽  
High Modulus ◽  
Hybrid Composite Material ◽  
Hybrid Fabric ◽  
Reinforcing Filler ◽  
Physical And Mechanical Characteristics

The paper considers possibilities of using a hybrid fabric made of high-modulus carbon yarn brand ZhGV and high-strength aramid yarns brand Rusar-NT for polymer composites reinforcement. The results of studies of the physical and mechanical characteristics of hybrid composite material and values of the implementation of the strength and elasticity carbon fibers and aramid module for composite material are presented. 

High-modulus polyvinyl alcohol fibres

1971 ◽  
Vol 1 (5) ◽  
pp. 578-579
Author(s):  
K. E. Perepelkin ◽  
O. S. Leninkov ◽  
L. E. Utevskii ◽  
A. I. Mazo ◽  
B. M. Pugach ◽  
...  
Keyword(s):  
Polyvinyl Alcohol ◽  
High Modulus

Effect of Heat Setting Methods on Structures and Properties of High Strength Polyvinyl Alcohol Fibre

2015 ◽  
Vol 815 ◽  
pp. 643-648
Author(s):  
Yin Zhu ◽  
Jiong Xin Zhao
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Polyvinyl Alcohol ◽  
Setting Time ◽  
High Strength ◽  
Single Fibre ◽  
X Ray Diffraction ◽  
Heat Setting ◽  
Heat Treated ◽  
Setting Process

The effect of heat setting methods on the structures and mechanical properties of high strength polyvinyl alcohol (PVA) fibre is studied in this article. The microstructure and mechanical properties of heat treated PVA fibre is investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD), and single fibre electronic tensile strength tester. Results show that the heat setting method with constant tension is a good heat setting method which can largely enhance the tensile strength of PVA fibre. During the heat setting process, the mechanical properties of PVA fibre are greatly affected by the temperature, tension and setting time. When the temperature is 220°C, tension is 5cN/dtex and setting time is 90sec, the tensile strength of PVA fibre increases from 12.0cN/dtex to 16.4cN/dtex in compare with the PVA fibre without heat setting

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