Features of Formation of a Multifilament Yarn from Crystallizing and Amorphic High-Heat Resistant Thermoplastics

In laboratory conditions, the molding process was simulated by extrusion of a multifilament yarn with a diameter of the monofilament equal 250-350 μm from high performance plastics. The possibility of obtaining a microfilament bundle of polyetheretherketone, polyphenylene sulfide and polyetherimide using a specially made forming head is shown. The technological modes of extrusion have been worked out, which makes it possible to obtain thermoplastic fibers from the studied thermoplastics. It was revealed that the obtained microfilaments can be subjected to post-processing by cold drawing to reduce their diameter by 40-70 %.

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Preparation of High Heat-Resistant Profile Based on PVC/α-MSAN/ABS Ternary Blends

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.690-693.1581 ◽

2013 ◽

Vol 690-693 ◽

pp. 1581-1585

Author(s):

Xing Wang ◽

Shao Yun Guo ◽

Fei Hu Yang

Keyword(s):

High Performance ◽

Softening Temperature ◽

High Heat ◽

Mechanical Analysis ◽

Ternary Blends ◽

Heat Resistant ◽

Styrene Acrylonitrile ◽

Methyl Styrene ◽

Pvc Profile ◽

The Impact

In this paper, ternary blends of PVC mixed with α-methyl styrene-acrylonitrile (α-MSAN) and toughening modifier was prepared, with the aim to obtain a high performance PVC profile with an improved heat resistant temperature, better impact property and good processability. The results of dynamic mechanical analysis (DMA) showed the good miscibility owing to the additional intermolecular interaction between α-hydrogen of PVC and AN of α-MSAN. The glass transition temperature (Tg) and vicat softening temperature (VST) were improved remarkably with introduction of α-MSAN due to excellent heat resistant property of α-MSAN. With regard to mechanical and process properties, the impact strength and dynamic rheological property were evaluated.

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CRONIFER II EXTRA, CRONIFER 45, CRONIFER III EXTRA, CRONIFER IV EXTRA

Alloy Digest ◽

10.31399/asm.ad.ni0405 ◽

1992 ◽

Vol 41 (6) ◽

Keyword(s):

Physical Properties ◽

Tensile Properties ◽

High Heat ◽

Heat Resistant

Abstract CRONIFER II EXTRA, 45, III EXTRA AND IV EXTRA alloys are high heat resistant alloys, some with resistance to green rot and hardening environments. This datasheet provides information on composition, physical properties, elasticity, and tensile properties. Filing Code: Ni-405. Producer or source: VDM Technologies Corporation.

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Perylene and perinone pigments

Physical Sciences Reviews ◽

10.1515/psr-2020-0190 ◽

2021 ◽

Vol 0 (0) ◽

Author(s):

Robert Christie ◽

Adrian Abel

Keyword(s):

High Performance ◽

Heat Stability ◽

High Heat ◽

Structural Features ◽

Fastness Properties ◽

Tetracarboxylic Acid ◽

Organic Pigments ◽

Orange Color ◽

Cis Isomer ◽

Chemical Class

Abstract Perylenes and perinones are separate groups of pigments categorized within the carbonyl chemical class. The two pigment groups show similarities, for example, in their chemical structural features and, to an extent, in their technical and application properties as high-performance organic pigments. Perylenes constitute a series of firmly established high-performance pigments, offering red and violet colors, and also extending to black. Synthetically, they are derived from perylene-1,4,5,8-tetracarboxylic acid. The perylenes tend to be quite expensive pigments, but their high levels of fastness properties mean that they are suitable for highly demanding applications. In particular, they offer very high heat stability. Two perinone pigments are used commercially. In their synthesis from naphthalene-1,4,5,8-tetracarboxylic acid, they are formed as mixtures of the two isomers, which can be separated. The trans isomer, CI Pigment Orange 43, is a highly important commercial pigment, especially for plastics, while the cis isomer, CI Pigment Red 194, is bordeaux in color and is of much lesser importance. The perinone, CI Pigment Orange 43, provides a brilliant orange color and has very good fastness properties. Its commercial manufacture involves a challenging multistage procedure and consequently it is one of the most expensive organic pigments on the market.

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Simultaneously controlling heat conduction and infrared absorption with a textured dielectric film to enhance the performance of thermopiles

Microsystems & Nanoengineering ◽

10.1038/s41378-021-00264-z ◽

2021 ◽

Vol 7 (1) ◽

Author(s):

Yunqian He ◽

Yuelin Wang ◽

Tie Li

Keyword(s):

Heat Conduction ◽

Infrared Absorption ◽

High Performance ◽

Performance Enhancement ◽

Dielectric Film ◽

Great Influence ◽

Thermal Conductance ◽

Molding Process ◽

Absorption Properties

AbstractThe heat conduction and infrared absorption properties of the dielectric film have a great influence on the thermopile performance. Thinning the dielectric film, reducing its contact area with the silicon substrate, or adding high-absorptivity nanomaterials has been proven to be effective in improving thermopiles. However, these methods may result in a decrease in the structural mechanical strength and increases in the fabrication complexity and cost. In this work, a new performance-enhancement strategy for thermopiles by simultaneously controlling the heat conduction and infrared absorption with a TExtured DIelectric (TEDI) film is developed and presented. The TEDI film is formed in situ by a simple hard-molding process that is compatible with the fabrication of traditional thermopiles. Compared to the control FLat DIelectric (FLDI) film, the intrinsic thermal conductance of the TEDI film can be reduced by ~18–30%, while the infrared absorption can be increased by ~7–13%. Correspondingly, the responsivity and detectivity of the fabricated TEDI film-based thermopile can be significantly enhanced by ~38–64%. An optimized TEDI film-based thermopile has achieved a responsivity of 156.89 V·W−1 and a detectivity of 2.16 × 108 cm·Hz1/2·W−1, while the response time constant can remain <12 ms. These results exhibit the great potential of using this strategy to develop high-performance thermopiles and enhance other sensors with heat transfer and/or infrared absorption mechanisms.

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High Heat-Resistant and Degradable Polybenzoxazines with a Diacetal Structure

ACS Sustainable Chemistry & Engineering ◽

10.1021/acssuschemeng.1c01919 ◽

2021 ◽

Author(s):

Peng Wang ◽

Shuai Zhang ◽

Wanghezi Xu ◽

Tianming Xiao ◽

Qichao Ran

Keyword(s):

High Heat ◽

Heat Resistant

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

Microorganisms ◽

10.3390/microorganisms9030667 ◽

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.

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A 31 mW, 280 fs passively mode-locked fiber soliton laser using a high heat-resistant SWNT/P3HT saturable absorber coated with siloxane

Optics Express ◽

10.1364/oe.20.023659 ◽

2012 ◽

Vol 20 (21) ◽

pp. 23659 ◽

Cited By ~ 5

Author(s):

Takato Ono ◽

Yuichiro Hori ◽

Masato Yoshida ◽

Toshihiko Hirooka ◽

Masataka Nakazawa ◽

...

Keyword(s):

Saturable Absorber ◽

High Heat ◽

Heat Resistant

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Design high heat-resistant stereocomplex poly(lactide acid) by cross-linking and plasticizing

Advances in Polymer Technology ◽

10.1002/adv.21917 ◽

2017 ◽

Vol 37 (7) ◽

pp. 2429-2435 ◽

Cited By ~ 1

Author(s):

Li Cui ◽

Yahui Wang ◽

Rundong Zhang ◽

Yun Liu

Keyword(s):

High Heat ◽

Cross Linking ◽

Heat Resistant

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Plasma Sprayed Ultra High Temperature Ceramics for Thermal Protection Systems

Thermal Spray 2000: Proceedings from the International Thermal Spray Conference ◽

10.31399/asm.cp.itsc2000p0837 ◽

2000 ◽

Author(s):

T. Valente ◽

C. Bartuli ◽

G. Visconti ◽

M. Tului

Keyword(s):

Plasma Spraying ◽

High Performance ◽

Thermal Protection ◽

Electrical Discharge Machining ◽

High Heat ◽

Heat Fluxes ◽

Space Vehicles ◽

Ultra High Temperature Ceramics ◽

Protection Systems ◽

Plasma Sprayed

Abstract Reusable space vehicles, which must withstand re-entry into the Earth's atmosphere, require external protection systems (TPS) which are usually in the forms of rigid surface in areas of high or moderate working temperature. High heat fluxes and temperatures related to high performance hypervelocity flights also require the use of TPS materials having good oxidation and thermal shock resistance, dimensional stability, and ablation resistance. Components by these materials are usually fabricated, starting from either billets or plate stocks, by uniaxial hot pressing, and complex parts, such as low radius edges, are then obtained by electrical discharge machining technique. This article investigates an alternative fabrication technology, based on plasma spraying, to produce near net shape components. Results of experimental activities, such as optimization of plasma spraying parameters based on a DOE approach, are reported and discussed.

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