Thermophysical and physical-mechanical properties of the modernized industrial PVC-plastic compound

2021 ◽  
pp. 84-93
Author(s):  
T. A. Borukaev ◽  
R. M. Martazanova
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Heat Release ◽  
Hydrogen Chloride ◽  
High Thermal Stability ◽  
Heat Of Combustion ◽  
Zinc Borate ◽  
Insulating Materials ◽  
Operational Characteristics

Compounds based on PVC-plasticate of I40-13A grade, zinc borate, antimony and chalk oxide have been obtained. The thermal stability, thermophysical and operational properties of the obtained compounds have been investigated. It was found that the modernized compounds have high thermal stability values that meet the requirements for insulating materials. It is shown that the obtained compounds have low values of heat release, heat of combustion, smoke formation and release of hydrogen chloride. It was found that the operational characteristics of the modernized PVC cable compounds are improved.

Thermostability and Mechanical Properties of PVC-Plastic/Molybdenum Compounds

2018 ◽  
Vol 935 ◽  
pp. 140-143
Author(s):  
Timur A. Borukaev ◽  
A.Kh. Shaov ◽  
I.A. Shogenova ◽  
M.A. Pshitsukova ◽  
M.S. Pshikhacheva
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Hydrogen Chloride ◽  
Structural Changes ◽  
High Thermal Stability ◽  
Thermal Stability Of

Composites based on PVC-plastic and molybdenum compounds were obtained. Thermostability and mechanical properties of the obtained compounds were studied. High thermal stability of the obtained PVC compounds was found. It is shown that molybdenum compounds effectively bind hydrogen chloride and catalyze structural changes in macromolecules. At the same time, the introduction of molybdenum compounds in PVC-plastic does not lead to deterioration in the mechanical properties of the material.

scholarly journals Effects of Substitution of Y with Yb and Ce on the Microstructures and Mechanical Properties of Mg88.5Zn5Y6.5

Metals ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 31
Author(s):  
Hongxin Liao ◽  
Taekyung Lee ◽  
Jiangfeng Song ◽  
Jonghyun Kim ◽  
Fusheng Pan
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Yield Strength ◽  
Creep Resistance ◽  
Room Temperature ◽  
High Thermal Stability ◽  
Long Period ◽  
Microstructures And Mechanical Properties

The microstructures and mechanical properties of the Mg88.5Zn5Y6.5-XREX (RE = Yb and Ce, X = 0, 1.5, 3.0, and 4.5) (wt.%) alloys were investigated in the present study. Mg88.5Zn5Y6.5 is composed of three phases, namely, α-Mg, long-period stacking ordered (LPSO) phases, and intermetallic compounds. The content of the LPSO phases decreased with the addition of Ce and Yb, and no LPSO phases were detected in Mg88.5Zn5Y2.0Yb4.5. The alloys containing the LPSO phases possessed a stratified microstructure and exhibited excellent mechanical properties. Mg88.5Zn5Y5.0Ce1.5 exhibited the highest creep resistance and mechanical strength at both room temperature and 200 °C, owing to its suitable microstructure and high thermal stability. The yield strength of Mg88.5Zn5Y5.0Ce1.5 at room temperature was 358 MPa. The ultimate tensile strength of Mg88.5Zn5Y5.0Ce1.5 at room temperature and 200 °C was 453 MPa and 360 MPa, respectively.

scholarly journals Highly Efficient Composite Flame Retardants for Improving the Flame Retardancy, Thermal Stability, Smoke Suppression, and Mechanical Properties of EVA

Materials ◽  
2020 ◽  
Vol 13 (5) ◽  
pp. 1251
Author(s):  
Yilin Liu ◽  
Bin Li ◽  
Miaojun Xu ◽  
Lili Wang
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Heat Release ◽  
Flame Retardant ◽  
Production Rate ◽  
Flame Retardancy ◽  
Flame Retardants ◽  
Mass Loss Rate ◽  
Smoke Suppression ◽  
Average Mass

Ethylene vinyl acetate (EVA) copolymer has been used extensively in many fields. However, EVA is flammable and releases CO gas during burning. In this work, a composite flame retardant with ammonium polyphosphate (APP), a charring–foaming agent (CFA), and a layered double hydroxide (LDH) containing rare-earth elements (REEs) was obtained and used to improve the flame retardancy, thermal stability, and smoke suppression for an EVA matrix. The thermal analysis showed that the maximum thermal degradation temperature of all composites increased by more than 37 °C compared with that of pure EVA. S-LaMgAl/APP/CFA/EVA, S-CeMgAl/APP/CFA/EVA, and S-NdMgAl/APP/CFA/EVA could achieve self-extinguishing behavior according to the UL-94 tests (V-0 rating). The peak heat release rate (pk-HRR) indicated that all LDHs containing REEs obviously reduced the fire strength in comparison with S-MgAl. In particular, pk-HRR of S-LaMgAl/APP/CFA/EVA, S-CeMgAl/APP/CFA/EVA and S-NdMgAl/APP/CFA/EVA were all decreased by more than 82% in comparison with pure EVA. Furthermore, the total heat release (THR), smoke production rate (SPR), and production rate of CO (COP) also decreased significantly. The average mass loss rate (AMLR) confirmed that the flame retardant exerted an effect in the condensed phase of the composites. Meanwhile, the combination of APP, CFA, and LDH containing REEs allowed the EVA matrix to maintain good mechanical properties.

The Synergistic Effect of Flame Retardants on Flammability, Thermal and Mechanical Properties of Natural Fiber Reinforced Epoxy Composite

2016 ◽  
Vol 701 ◽  
pp. 281-285 ◽  
Author(s):  
Pooria Khalili ◽  
Kim Yeow Tshai ◽  
Ing Kong ◽  
Jun Hui Lee ◽  
Farzad Arefi Mostafa
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Mass Loss ◽  
Heat Release ◽  
Natural Fiber ◽  
Synergistic Effects ◽  
Epoxy Composites ◽  
Zinc Borate ◽  
Thermal And Mechanical Properties ◽  
Combustion Heat

Epoxy was effectively resin infused with 15 %wt intumescing Alumina Trihydrate (ATH) flame retardant (FR) formulations into a 10 %wt palm EFB natural fiber (NF) mat. The effects of ATH and its intumescing blend with Zinc Borate (ZB) and Ammonium Polyphosphate (APP) on flammability, thermal and mechanical properties of the composites were investigated. Compared to neat NF filled epoxy composites, specimens loaded with intumescing blend of FR formulations demonstrated an improved thermal properties, showing greater mass residual which can be attributed to the formation of cross-linked network amongst the NF, FRs and epoxy matrix upon combustion at elevated temperature tested within a TGA instrument. Incorporation of fibers drastically enhanced the mass residue and lowered the heat release compare to the pure epoxy. Addition of the intumescing blend of FR formulations also drastically reduces the combustion heat release, total mass loss and zero drip flame in the NF composites. The optimum FRs formulation with 5 %wt ATH and 10 %wt APP exhibited self-extinguishing property, achieved lowest mass loss and no drip flame under Bunsen burner tests, signifying the synergistic effects between ATH and APP within the NF epoxy composites. APP reacts with the carbonaceous network of NF throughout the ignition period, such interaction formed a thick char layer acting as gas and thermal barrier against the fire mechanism. This reaction does not take place in NF composite specimens without APP. In terms of mechanical properties, NF composites loaded with FRs broadly showed poorer tensile strength, mainly due to the existence of FRs, which acted as a nucleating agent affected the physico-mechanical characteristics of the composites. Amongst the FR rich formulations, specimens with APP or ZB blends seem to possess a more superior tensile strength compared with the neat ATH filled formulation. In addition, composites loaded with FRs showed enhanced Young’s modulus relative to those without addition of FRs.

New, thermally stable, rigid polyurethane foams based on polyols obtained using morpholine-2,3-dione derivatives

2018 ◽  
Vol 54 (4) ◽  
pp. 719-741 ◽  
Author(s):  
Iwona Zarzyka ◽  
Anita Bialkowska ◽  
Tomasz Paczesniak ◽  
Wieslaw Fracz ◽  
Dorota Majda
Keyword(s):  
Thermal Stability ◽  
Mechanical Strength ◽  
Operating Temperature ◽  
Polyurethane Foams ◽  
High Thermal Stability ◽  
Thermally Stable ◽  
Insulating Materials ◽  
Research Results ◽  
Rigid Polyurethane Foams

In this work, the research results of the synthesis and properties of the polyols with the oxamidoester group, obtained in the reaction of N-substituted morpholine-2,3-dione derivatives with excess of alkylene carbonates have been presented. Using these derivatives as polyol components, rigid foamed polyurethane materials of high thermal stability and mechanical strength have been obtained. New polyurethane foams obtained using hydroxypropyl morpholine-2,3-dione derivatives can be used as heat-insulating materials of operating temperature as high as 150°C.

Synergistic Effect between Modified Graphene Oxide and Ammonium Polyphosphate on Combustion Performance, Thermal Stability and Mechanical Properties of Polylactic Acid

2021 ◽  
Vol 36 (4) ◽  
pp. 367-378
Author(s):  
X.-Y. Pang ◽  
Y.-F. Meng ◽  
Y.-P. Xin ◽  
R. Chang ◽  
J.-Z. Xu
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Graphene Oxide ◽  
Heat Release ◽  
Polylactic Acid ◽  
Network Structure ◽  
Ammonium Polyphosphate ◽  
Limiting Oxygen Index ◽  
Combustion Performance ◽  
Modified Graphene Oxide

Abstract To improve the thermal stability, ZF-GO (graphene oxide (GO) modified by zinc ferrite (ZF)) is prepared. In view of the anti-dripping function of ZF-GO and flame retardant effect of ammonium polyphosphate (APP), the influence of ZF-GO, APP, mixture of ZF-GO and APP on combustion performance, thermal stability and mechanical properties of polylactic acid (PLA) is investigated. Results show that the modification of GO by ZF significantly improves the residue of ZFGO by 34.7%. The char-forming capability and unique network structure of ZF-GO prevent the melt dripping of PLA. Although APP can increase the limiting oxygen index of PLA, there is still melt dripping. The combination of ZF-GO and APP improves the residual yield of 94PLA/3ZF-GO/3APP by 4.3 times relative to pure PLA, and the UL-94 level reaches V-0. The two additives show synergistic char-forming effect, and there is both physical carbonization and chemical carbonization. The incorporated fillers can decrease the total heat release (THR) of PLA composites. Specifically, the THR and peak value of heat release rate of 94PLA/3ZF-GO/3APP decrease by 21.2% and 53.9%, respectively. For the PLA/ZF-GO/APP system, plenty of residues and the anti-dripping network structure are key factors to get good flame retardancy. Addition of ZFGO and APP reduces the tensile strength, but the tensile elongation of the modified PLA composites is improved. 94PLA/ 3ZF-GO/3APP shows good integrated performance.

scholarly journals Effects of chemical pre-treatment on structure and property of polyacrylonitrile based pre-oxidized fibers

2020 ◽  
Vol 15 ◽  
pp. 155892501989894
Author(s):  
Xiaolu Sun ◽  
Jiayin Song ◽  
Jin Zhang ◽  
Jingyan Liu ◽  
Huizhen Ke ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Heat Release ◽  
Flame Retardant ◽  
Oxygen Index ◽  
Energy Dispersive Spectrometer ◽  
Chemical Compositions ◽  
Limiting Oxygen Index ◽  
X Ray ◽  
Pre Treatment

Polyacrylonitrile-based pre-oxidized fibers with improved thermal stability, flame retardant, and mechanical properties were made from the pristine polyacrylonitrile fibers through chemical pretreatment followed by pre-oxidation in air. The morphological structure of the polyacrylonitrile-based pre-oxidized fibers was investigated by Fourier transfer infrared spectra, X-ray diffraction, scanning electron microscopy, and X-ray energy dispersive spectrometer. The changes of characteristic functional groups and chemical compositions confirmed the successful modification of the polyacrylonitrile fibers during pre-treatment. The grooves and cracks on the surface of polyacrylonitrile-based pre-oxidized fibers were remarkably decreased in comparison with that of pristine polyacrylonitrile fibers. The evolution of crystalline structure of the polyacrylonitrile fibers proved the occurrence of cyclization reactions during pre-oxidation. Meanwhile, thermal stability, flame retardant, and mechanical properties of polyacrylonitrile-based pre-oxidized fibers were also investigated by thermogravimetric analyzer, oxygen index meter, micro combustion calorimeter, and single fiber tensile tester, respectively. The results demonstrated that the polyacrylonitrile-based pre-oxidized fibers initially pre-treated by hydroxylamine hydrochloride, followed by monoethanolamine, had a high limiting oxygen index of 40.1 and breaking strength of 2.03 cN/dtex. The peak of heat release rate and total heat release of polyacrylonitrile-based pre-oxidized fibers decreased significantly while its charred residues increased, contributing to the improved flame retardant property.

Preformed particle gels for enhanced oil recovery

2020 ◽  
Vol 34 (28) ◽  
pp. 2050260
Author(s):  
B. A. Suleimanov ◽  
E. F. Veliyev ◽  
N. V. Naghiyeva
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Polymer Matrix ◽  
Oil Recovery ◽  
Sulfonic Acid ◽  
Bentonite Clay ◽  
High Thermal Stability ◽  
Ammonium Persulphate ◽  
Hydrophilic Interactions ◽  
Preformed Particle Gels

This study refers to the synthesis of new advanced preformed particle gels (PPGs) based on 2-acrylamido-2-methylpropane sulfonic acid (AMPS), Polyvinyl Pirrolidone (PVP) and bentonite clay. For the synthesis, [Formula: see text], [Formula: see text]-methylenebisacrylamide was used as crosslinker and ammonium persulphate as initiator. As a consequence of the inclusion of clay into the polymer matrix and the intercalation of AMPS between the layers as well as the presence of hydrophilic interactions occurring between partners, the final PPGs possessed greater swelling degrees, slower de-swelling process, high thermal stability and enhanced mechanical properties in comparison with pure PPG.

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