Shot blasting dust as a filler in elastomer composites

2021 ◽  
pp. 009524432110153
Author(s):  
Mirosława Prochoń ◽  
Jacek Sawicki ◽  
Maciej Reda ◽  
Piotr Sirek ◽  
Małgorzata Suwalska ◽  
...  
Keyword(s):  
Functional Properties ◽  
Decomposition Temperature ◽  
Spatial Network ◽  
Shot Blasting ◽  
Sem Images ◽  
Wave Numbers ◽  
Hydrophobic Nature ◽  
Elastomer Composites ◽  
The Impact ◽  
Thermal Stability Of

The aim of this article was to determine the impact of using shot blasting dust as a filler in natural rubber (NR) composites. Increasing filler contents were used, from 0 to 30 parts by weight per 100 g of rubber. Examination of the wetting characteristics of the dust confirmed its hydrophobic nature. This characteristic makes it easier to introduce dust into the elastomer structure, with better binding to the mixture ingredients. FTIR spectra confirmed the presence of the filler in the elastomer matrix, with changes in absorbency intensity and the absence of peaks at given wave numbers. SEM images were taken to compare the surface topography of the compositions with and without the filler. The compositions with fillers showed the presence of a common spatial network. The functional properties of the obtained elastomer compositions were analyzed. Mechanical examinations demonstrated that the introduction of dust into the elastomer compositions contributed to improve the mechanical properties of the compositions. The conductivity of the elastomer structures increased with the addition of the filler but these changes were minor and allow the vulcanizates to remain classified as insulators. TGA/DSC demonstrated an increase in the thermal stability of the composites after the introduction of shot blasting dust into the elastomer structure. The decomposition temperature shifted toward higher values and an increase in glass transition temperature was observed for the filled compositions. The results of this study indicate that the use of shot blasting dust as a filler in NR improves the functional properties of the vulcanizates and could be competitive with more widely-used methods using fillers such as silica or chalk.

Preparation, characterization, and properties of polystyrene/Na-montmorillonite composites

2018 ◽  
Vol 32 (8) ◽  
pp. 1078-1091 ◽  
Author(s):  
Sibel Erol Dağ ◽  
Pınar Acar Bozkurt ◽  
Fatma Eroğlu ◽  
Meltem Çelik
Keyword(s):  
Electron Microscopy ◽  
Interlayer Spacing ◽  
Decomposition Temperature ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Sem Images ◽  
Specific Pore Volume ◽  
Transmission Electron ◽  
Thermal Stability Of

A series of polystyrene (PS)/unmodified Na-montmorillonite (Na-MMT) composites were prepared via in situ radical polymerization. The prepared composites were characterized using various techniques. The presence of various functional groups in the unmodified Na-MMT and PS/unmodified Na-MMT composite was confirmed by Fourier transform infrared spectroscopy. Morphology and particle size of prepared composites was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). According to the XRD and TEM results, the interlayer spacing of MMT layers was expanded. SEM images showed a spongy and porous-shaped morphology of composites. TEM revealed the Na-MMT intercalated in PS matrix. The thermal stability of PS/unmodified Na-MMT composites was significantly improved as compared to PS, which is confirmed using thermogravimetric analysis (TGA). The TGA curves indicated that the decomposition temperature of composites is higher at 24–51°C depending on the composition of the mixture than that of pure PS. The differential scanning calorimetry (DSC) results showed that the glass transition temperature of composites was higher as compared to PS. The moisture retention, water uptake, Brunauer–Emmett–Teller specific surface area, and specific pore volume of composites were also investigated. Water resistance of the composites can be greatly improved.

Composites of Polypropylene/Pottery Stone/Magnesium Oxysulfate

2012 ◽  
Vol 488-489 ◽  
pp. 643-647 ◽  
Author(s):  
Saowaroj Chuayjuljit ◽  
Thitima Rupunt ◽  
Thatisorn Karnjanamayul
Keyword(s):  
Thermal Stability ◽  
Impact Strength ◽  
Transfer Energy ◽  
Melt Mixing ◽  
Sem Images ◽  
Shaped Particle ◽  
Twin Screw ◽  
Magnesium Oxysulfate ◽  
The Impact ◽  
Thermal Stability Of

The impact strength, thermal stability and morphology of polypropylene (PP) composites filled with pottery stone (PTS) and magnesium oxysulfate (MOS) were investigated. PP/PTS composites were prepared by melt mixing of PP with four loadings of PTS (5, 10, 15 and 20 phr) and each PP/PTS composite with two loadings of MOS (3 and 5 phr) on a twin screw extruder, followed by injection molding into the impact test specimens. The SEM images show a particulate form of PTS particles and a needle-shaped particle with high aspect ratio of MOS. It is found that the impact strength of PP increased with increasing PTS and MOS loading levels. This is because PTS and MOS provide high ability to transfer energy from one phase to another. The thermal stability of PP was improved by shifting the Tonset, Tend set and %char residue towards higher values. Moreover, SEM images of the fractured surfaces show that PTS and MOS are well dispersed in the PP matrix.

Study on the Preparation and Properties of Epoxy/PEI/Nano-Attapulgite Nanocomposites

2013 ◽  
Vol 745-746 ◽  
pp. 341-351
Author(s):  
Chang Xiu Fan ◽  
Jing Kuan Duan ◽  
Ya Li ◽  
Shuang Xi Shao ◽  
Pei De Han
Keyword(s):  
Epoxy Resin ◽  
Thermo Gravimetric Analysis ◽  
Gravimetric Analysis ◽  
Sem Images ◽  
Thermal Measurements ◽  
Organically Modified ◽  
Glass Translation ◽  
The Impact ◽  
And Storage ◽  
Thermal Stability Of

Polyether imides (PEI) and nanoattapulgite particles organically synthesized by the active silane containing epoxide groups (OAT) were used to modify the epoxy resin (ER). The effect of the concentration of OAT on the morphology, thermal and mechanical properties of ER/PEI/OAT nanocomposites was explored in the present work. The microscopic structure of nanocomposites was investigated by Scanning electric microscopy (SEM). The results showed that a homogeneous nanoattapulgite organically-modified by silane in the polymeric matrix was obtained. SEM images showed that the morphology transformation increased with the increase of OAT content, which would lead the improvement of the impact strengths of nanocomposites. The results of mechanical and thermal measurements indicated that the introduction of PEI and OAT into the epoxy resulted in the great improvement of the impact strength and storage module. With the OAT concentration increasing, the glass translation temperature (Tg) value of nanocomposites was gradually increased. Additionally, the results of thermo-gravimetric analysis (TGA) revealed that thermal stability of nanocomposites was apparently improved in comparison to the epoxy resin systems.

Evaluation of the Impact of Fatty Acid Methyl Ester (FAME) Contamination on the Thermal Stability of Jet A

2013 ◽  
Author(s):  
Jr Morris ◽  
Shardo Robert W. ◽  
Higgins James ◽  
Cook Kim ◽  
Tanner Rhonda ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Fatty Acid ◽  
Methyl Ester ◽  
Fatty Acid Methyl Ester ◽  
Acid Methyl Ester ◽  
Acid Methyl ◽  
The Impact ◽  
Thermal Stability Of

scholarly journals Fermentation as a Tool to Revitalise Brewers’ Spent Grain and Elevate Techno-Functional Properties and Nutritional Value in High Fibre Bread

Foods ◽  
2021 ◽  
Vol 10 (7) ◽  
pp. 1639
Author(s):  
Emma Neylon ◽  
Elke K. Arendt ◽  
Emanuele Zannini ◽  
Aylin W. Sahin
Keyword(s):  
Functional Properties ◽  
Nutritional Value ◽  
Bread Quality ◽  
Wheat Bread ◽  
Promising Tool ◽  
Additional Processing ◽  
Spent Grain ◽  
The Impact ◽  
Over Time

Recycling of by-products from the food industry has become a central part of research to help create a more sustainable future. Brewers’ spent grain is one of the main side-streams of the brewing industry, rich in protein and fibre. Its inclusion in bread, however, has been challenging and requires additional processing. Fermentation represents a promising tool to elevate ingredient functionality and improve bread quality. Wheat bread was fortified with spray-dried brewers’ spent grain (BSG) and fermented brewers’ spent grain (FBSG) at two addition levels to achieve “source of fibre” and “high in fibre” claims according to EU regulations. The impact of BSG and FBSG on bread dough, final bread quality and nutritional value was investigated and compared to baker’s flour (BF) and wholemeal flour (WMF) breads. The inclusion of BSG and FBSG resulted in a stronger and faster gluten development; reduced starch pasting capacity; and increased dough resistance/stiffness. However, fermentation improved bread characteristics resulting in increased specific volume, reduced crumb hardness and restricted microbial growth rate over time. Additionally, the inclusion of FBSG slowed the release in reducing sugars over time during in vitro starch digestion. Thus, fermentation of BSG can ameliorate bread techno-functional properties and improve nutritional quality of breads.

Design and Characterization of Novel Dirhodium Coordination Polymers - The Impact of Ligand Size on Selectivity in Asymmetric Cyclopropanation

2021 ◽  
Author(s):  
Zhenzhong Li ◽  
Lorenz Roesler ◽  
Till Wissel ◽  
Hergen Breitzke ◽  
Kathrin Hofmann ◽  
...  
Keyword(s):  
Coordination Polymers ◽  
Ligand Exchange ◽  
Dicarboxylic Acids ◽  
Sem Images ◽  
Asymmetric Cyclopropanation ◽  
The Impact

Three chiral dirhodium coordination polymers Rh2-Ln (n=1-3) have been synthesized via ligand exchange between dirhodium trifluoroacetate Rh2(TFA)4 and differently sized chiral dicarboxylic acids derived from L-tert-leucine. SEM images indicate that...

scholarly journals An Effective Method for Preparation of Liquid Phosphoric Anhydride and Its Application in Flame Retardant Epoxy Resin

Materials ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2205
Author(s):  
Qian Li ◽  
Yujie Li ◽  
Yifan Chen ◽  
Qiang Wu ◽  
Siqun Wang
Keyword(s):  
Flame Retardant ◽  
Epoxy Resin ◽  
Epoxy Resins ◽  
Oxygen Index ◽  
Decomposition Temperature ◽  
Ease Of Use ◽  
Limiting Oxygen Index ◽  
Good Thermal Stability ◽  
Low Viscosity ◽  
The Impact

A novel liquid phosphorous-containing flame retardant anhydride (LPFA) with low viscosity was synthesized from 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) and methyl tetrahydrophthalic anhydride (MeTHPA) and further cured with bisphenol-A epoxy resin E-51 for the preparation of the flame retardant epoxy resins. Both Fourier transform infrared spectroscopy (FT-IR), mass spectrometry (MS) and nuclear magnetic resonance (NMR) measurements revealed the successful incorporation of DOPO on the molecular chains of MeTHPA through chemical reaction. The oxygen index analysis showed that the LPFA-cured epoxy resin exhibited excellent flame retardant performance, and the corresponding limiting oxygen index (LOI) value could reach 31.2%. The UL-94V-0 rating was achieved for the flame retardant epoxy resin with the phosphorus content of 2.7%. With the addition of LPFA, the impact strength of the cured epoxy resins remained almost unchanged, but the flexural strength gradually increased. Meanwhile, all the epoxy resins showed good thermal stability. The glass transition temperature (Tg) and thermal decomposition temperature (Td) of epoxy resin cured by LPFA decreased slightly compared with that of MeTHPA-cured epoxy resin. Based on such excellent flame retardancy, low viscosity at room temperature and ease of use, LPFA showed potential as an appropriate curing agent in the field of electrical insulation materials.

Study on Synthesis and Thermal Property of Polyvinylamine

2010 ◽  
Vol 150-151 ◽  
pp. 1500-1503 ◽  
Author(s):  
Hong Chi Zhao ◽  
Qi Li ◽  
Wen Yu Xu ◽  
Fan Huang
Keyword(s):  
Decomposition Temperature ◽  
Characteristic Peak ◽  
Initial Decomposition Temperature ◽  
Nmr Spectrum ◽  
X Ray ◽  
Nuclear Magnetic Resonance Spectrometer ◽  
Chemical Structures ◽  
Thermogravimetric Analyzer ◽  
Infrared Spectrometer ◽  
Thermal Stability Of

Polyvinylamine (PVAm) and polyvinylamine chloride (PVAm•HCl) were synthesized by Hofmann degradation of polyacrylamide (PAM). The reaction condition is gentle and the operation is safe, simple and economical so that it is a good reaction method. The chemical structures and thermal properties of the polymers were studied by Fourier transform infrared spectrometer (FTIR), nuclear magnetic resonance spectrometer (NMR), X-ray diffractmeter (XRD) and thermogravimetric analyzer (TGA). Synthesis of PVAm•HCl was confirmed by the intensities of the characteristic peak of -CONH2 decreased and the appearance of a new absorption peak at 1530cm-1 (due to N-H bond of -NH3+ ) in the FTIR spectrum, the appearance of the characteristic absorption peaks of carbon atoms in the 13C NMR spectrum, the appearance of chemical shift assignments of proton in 1H NMR spectrum and the appearance of characteristic dispersing diffraction peak between 22.5° to 25.2° in the XRD spectrum, respectively. PAM had three decomposing stages, but PVAm•HCl had two decomposing stages. TG curve of PAM and PVAm•HCl showed that the initial decomposition temperature were 190oC and 140oC, respectively. The thermal stability of PVAm•HCl was poorer than that of PAM.

scholarly journals Repeated social defeat exaggerates fibrin-rich clot formation in FeCl3-induced arterial thrombosis mouse model by enhancing NETs formation via modulation of neutrophil functional properties

2020 ◽  
Vol 41 (Supplement_2) ◽  
Author(s):  
T Sugimoto ◽  
H Yamada ◽  
H Kubota ◽  
D Miyawaki ◽  
M Saburi ◽  
...  
Keyword(s):  
Functional Properties ◽  
Arterial Thrombosis ◽  
Social Defeat ◽  
Arterial Injury ◽  
Physical Contact ◽  
Clot Formation ◽  
Positive Staining ◽  
Double Positive ◽  
The Impact

Abstract Background and objective Depression is an independent risk factor of cardiovascular disease (CVD). We have recently shown that repeated social defeat (RSD) precipitates depressive-like behaviors in apoE−/− mice and exaggerates atherosclerosis development by enhancing neutrophil extracellular traps (NETs) formation. Here, we investigated the impact of RSD on arterial thrombosis. Methods and results Eight-week-old male WT mice were exposed to RSD by housing with a larger CD-1 mouse in a shared home cage. They were subjected to vigorous physical contact daily for 10 consecutive days. Control mice were housed in the same gage without physical contact. After social interaction test to confirm depressive-like behaviors, defeated mice (19 of 31) and control mice (12 of 14) were underwent arterial injury at 10 wks of age. A filter paper saturated with 10% FeCl3 was applied on the adventitial surface of left carotid artery for 3 min and analyzed 3 hrs later. The volume of thrombi was comparable between the two groups. However, fibrinogen/fibrin-positive areas in immunofluorescent images significantly increased in defeated mice (27.8% vs. 48.8%, p<0.01). The number of Ly-6G-positive cells in thrombi was markedly higher in defeated mice (144/mm2 vs. 878/mm2, p<0.05). Further, Ly-6G-positive cells were almost accumulated at the inner surface of injured artery, which were co-localized with neutrophil elastase, Cit-H3, and CD41-positive staining. Treatment with DNase I completely diminished the exaggerated fibrin-rich clot formation in defeated mice to an extent similar to that in control mice (25.7% vs. 22.3%, p = ns), without affecting the volume of thrombi and accumulation of Ly-6G-positive cells. Given that platelet aggregations induced by ADP or collagen were comparable between the two groups, neutrophil functional properties primarily contribute to the exaggerated fibrin-rich clot formation in defeated mice. We then examined neutrophil subset and vulnerability to NETs formation. At 3 hrs after FeCl3 application, the numbers of immature neutrophils (Ly6Glo/+CXCR2-) were comparable between the two groups in both bone marrow (BM) and peripheral blood (PB). In contrast, the number of PB mature neutrophils (Ly6G+CXCR2+) was markedly higher in defeated mice than control mice (580±68 /μl vs. 1265±114, p<0.01). We next examined in vitro NETs formation upon PMA in BM mature neutrophils by FACS and nucleic acid staining. The percentage of double-positive cells (Cit-H3, MPO) was significantly higher in defeated mice (7.5% vs. 10.2%, p<0.05), as well as SYTOX green-positive cells expelling DNA fibers (8.1% vs. 11.8%, p<0.05). Conclusions Our findings demonstrate for the first time that repeated social defeat enhances fibrin-rich clot formation after arterial injury by enhancing NETs formation via modulation of neutrophil functional properties, suggesting that NETosis could be a new therapeutic target in depression-related CVD development. Funding Acknowledgement Type of funding source: None

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