scholarly journals STUDY OF THERMOMECHANICAL PROPERTIES OF UHMWPE

2021 ◽  
pp. 30-33
Author(s):  
N. A. Adamenko ◽  
G. V. Agafonova ◽  
D. A. An ◽  
A. V. Kazurov ◽  
V. S. Pirozhenko
Keyword(s):  
Molecular Weight ◽  
Heat Resistance ◽  
Graphite Powder ◽  
High Heat ◽  
Thermomechanical Properties ◽  
High Heat Resistance ◽  
Similar Material ◽  
Ultra High Molecular Weight ◽  
Static Pressing ◽  
Explosive Pressing

The paper presents comparative studies of the thermomechanical properties of ultra-high molecular weight polyethylene (UHMWPE) and its composite containing 0.5% coke-graphite powder (CGP). It was found that explosive pressing with a pressure of 0.25-0.6 GPa provides high heat resistance of UHMWPE and the investigated composite (154-156 ° C). The heat resistance of the composite decreases to 143-145 ° C, but it is higher than that of a similar material after static pressing (128 ° C).

scholarly journals RESEARCH OF THERMOMECHANICAL PROPERTIES OF UHMWPE AND ITS COMPOSITE WITH QGP AFTER EXPLOSIVE COMPRESSION

2021 ◽  
pp. 30-33
Author(s):  
N. A. Adamenko ◽  
G. V. Agafonova ◽  
D. A. An ◽  
A. V. Kazurov ◽  
V. S. Pirozhenko
Keyword(s):  
Thermal Deformation ◽  
Ultrahigh Molecular Weight Polyethylene ◽  
Graphite Powder ◽  
High Heat ◽  
Thermomechanical Properties ◽  
Adhesive Interaction ◽  
Industrial Processing ◽  
Ultrahigh Molecular Weight ◽  
Composite Mixture ◽  
Explosive Pressing

To develop the technology of explosive pressing of ultrahigh molecular weight polyethylene (UHMWPE) and its powder composite mixtures with inorganic fillers, the thermomechanical properties of an unfilled polymer and a composite containing 3% coke graphite powder (KGP) after explosive pressing were studied. It was found that explosive pressing with a pressure of 0.25-1.3 gpa provides high heat resistance of UHMWPE and the studied composite (154-156 °C), and the filler restrains the thermal deformation expansion of the polymer, which is associated with increased intermolecular and adhesive interaction at the phase boundary. Thus, the method of explosive pressing can be recommended for industrial processing of UHMWPE and its composite mixture with 3 % KGP.

scholarly journals RESEARCH OF THERMAL PROPERTIES AND STRUCTURE OF UHMWPE COMPOSITES WITH β-SIALON AFTER EXPLOSIVE PRESSING

2020 ◽  
pp. 30-34
Author(s):  
N. A. Adamenko ◽  
G. V. Agafonova ◽  
D. V. Savin ◽  
V. S. Pirozhenko ◽  
D. A. An ◽  
...  
Keyword(s):  
Heat Resistance ◽  
Thermal Deformation ◽  
Thermomechanical Properties ◽  
Adhesive Interaction ◽  
Industrial Processing ◽  
Composite Mixture ◽  
Uhmwpe Composites ◽  
Composite Heat ◽  
Ultra High Molecular Weight ◽  
Explosive Pressing

With the aim of developing a technology for explosive pressing of powder composite mixtures of ultra-high molecular weight polyethylene (UHMWPE) with inorganic fillers, the thermomechanical properties and structure of a composite containing 5% β-sialon after static and explosive pressing were investigated. It was found that explosive pressing with a pressure of 0.75 GPa provides a composite heat resistance close to that of the initial UHMWPE (142-148 °C), reducing its thermal deformation expansion, which is associated with an increase in intermolecular as well as adhesive interaction at the phase boundary. During sintering, the polymer matrix is monolithized, and higher heat resistance is achieved after sintering under pressure. The research results allow us to recommend a method of explosive pressing for industrial processing of a composite mixture of UHMWPE + 5% β-sialon.

scholarly journals Clustering rooting for the high heat resistance of some CHNO energetic materials

FirePhysChem ◽  
2021 ◽  
Vol 1 (1) ◽  
pp. 8-20
Author(s):  
Xingyu Huo ◽  
Fanfan Wang ◽  
Liang Liang Niu ◽  
Ruijun Gou ◽  
Chaoyang Zhang
Keyword(s):  
Heat Resistance ◽  
Energetic Materials ◽  
High Heat ◽  
High Heat Resistance

scholarly journals Molecular Physiological Characterization of a High Heat Resistant Spore Forming Bacillus subtilis Food Isolate

2021 ◽  
Vol 9 (3) ◽  
pp. 667
Author(s):  
Zhiwei Tu ◽  
Peter Setlow ◽  
Stanley Brul ◽  
Gertjan Kramer
Keyword(s):  
Bacillus Subtilis ◽  
Heat Resistance ◽  
Dipicolinic Acid ◽  
Laboratory Strain ◽  
High Heat ◽  
High Heat Resistance ◽  
Vegetative Cells ◽  
Heat Resistant ◽  
Food Isolate ◽  
Wet Heat

Bacterial endospores (spores) are among the most resistant living forms on earth. Spores of Bacillus subtilis A163 show extremely high resistance to wet heat compared to spores of laboratory strains. In this study, we found that spores of B. subtilis A163 were indeed very wet heat resistant and released dipicolinic acid (DPA) very slowly during heat treatment. We also determined the proteome of vegetative cells and spores of B. subtilis A163 and the differences in these proteomes from those of the laboratory strain PY79, spores of which are much less heat resistant. This proteomic characterization identified 2011 proteins in spores and 1901 proteins in vegetative cells of B. subtilis A163. Surprisingly, spore morphogenic protein SpoVM had no homologs in B. subtilis A163. Comparing protein expression between these two strains uncovered 108 proteins that were differentially present in spores and 93 proteins differentially present in cells. In addition, five of the seven proteins on an operon in strain A163, which is thought to be primarily responsible for this strain’s spores high heat resistance, were also identified. These findings reveal proteomic differences of the two strains exhibiting different resistance to heat and form a basis for further mechanistic analysis of the high heat resistance of B. subtilis A163 spores.

P-57: A Transparent Plastic Film having Excellent Optical Properties and High Heat Resistance for Flexible Display Substrates

2006 ◽  
Vol 37 (1) ◽  
pp. 418 ◽  
Author(s):  
Yoshiaki Watanabe ◽  
Ken-ichi Makita ◽  
Yasuyoshi Fujii ◽  
Hisanori Okada ◽  
Naoto Obara ◽  
...  
Keyword(s):  
Optical Properties ◽  
Heat Resistance ◽  
High Heat ◽  
Plastic Film ◽  
High Heat Resistance ◽  
Flexible Display ◽  
Transparent Plastic

Palladium-catalyzed silation of adamantanedi- and triol, leading to adamantane–siloxane alternating polymers with high heat resistance

Polymer ◽  
2007 ◽  
Vol 48 (15) ◽  
pp. 4301-4304 ◽  
Author(s):  
Joji Ohshita ◽  
Koichi Hino ◽  
Ko Inata ◽  
Atsutaka Kunai ◽  
Takayuki Maehara
Keyword(s):  
Heat Resistance ◽  
High Heat ◽  
High Heat Resistance ◽  
Palladium Catalyzed

A high heat-resistance bioplastic foam with efficient electromagnetic interference shielding

2017 ◽  
Vol 323 ◽  
pp. 29-36 ◽  
Author(s):  
Cheng-Hua Cui ◽  
Ding-Xiang Yan ◽  
Huan Pang ◽  
Li-Chuan Jia ◽  
Xin Xu ◽  
...  
Keyword(s):  
Heat Resistance ◽  
Electromagnetic Interference ◽  
High Heat ◽  
High Heat Resistance ◽  
Electromagnetic Interference Shielding

scholarly journals Factors Contributing to Heat Resistance of Clostridium perfringens Endospores

2008 ◽  
Vol 74 (11) ◽  
pp. 3328-3335 ◽  
Author(s):  
Benjamin Orsburn ◽  
Stephen B. Melville ◽  
David L. Popham
Keyword(s):  
Cell Wall ◽  
Heat Resistance ◽  
Clostridium Perfringens ◽  
Food Poisoning ◽  
High Heat ◽  
Relative Importance ◽  
High Heat Resistance ◽  
Factors Affecting ◽  
Cooking Process ◽  
Determining Factors

ABSTRACT The endospores formed by strains of type A Clostridium perfringens that produce the C. perfringens enterotoxin (CPE) are known to be more resistant to heat and cold than strains that do not produce this toxin. The high heat resistance of these spores allows them to survive the cooking process, leading to a large number of food-poisoning cases each year. The relative importance of factors contributing to the establishment of heat resistance in this species is currently unknown. The present study examines the spores formed by both CPE+ and CPE− strains for factors known to affect heat resistance in other species. We have found that the concentrations of DPA and metal ions, the size of the spore core, and the protoplast-to-sporoplast ratio are determining factors affecting heat resistance in these strains. While the overall thickness of the spore peptidoglycan was found to be consistent in all strains, the relative amounts of cortex and germ cell wall peptidoglycan also appear to play a role in the heat resistance of these strains.

Magnetic Domain Structures and Magnetic Properties of Lightly Nd-Doped Sm–Co Magnets With High Squareness and High Heat Resistance

2019 ◽  
Vol 55 (2) ◽  
pp. 1-4 ◽  
Author(s):  
Hiroaki Machida ◽  
Teruhiko Fujiwara ◽  
Chieko Fujimoto ◽  
Yu Kanamori ◽  
Jun Tanaka ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Heat Resistance ◽  
Magnetic Domain ◽  
High Heat ◽  
High Heat Resistance ◽  
Domain Structures
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