Wyniki wyszukiwania - BazTech

1

Polymer electrolytes based on POE and Na-TFS salt for all-solid-state batteries

Martinez-Cisneros C. S., Sanchez J. Y., Levenfeld B., Varez A.

Journal of Achievements in Materials and Manufacturing Engineering

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2015

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Vol. 73, nr 2

72--79

EN

Purpose: Currently, electrochemical energy storage systems mostly focus on lithiumion batteries; especially in the field of portable electronics and electric transportation. Nevertheless, it is expected that the exponential growth of these markets and limited lithium resources will increase the price of lithium-based energy storage systems. To meet growing demands in terms of green and sustainable electric power storage, alternative electrochemical technologies towards post lithium-ion batteries are required. Design/methodology/approach: In the present study, polymer electrolytes based on poly(oxyethylene) (POE) and Na-TFS (NaCF3SO3) were developed to be used in solventfree batteries. Electrolytes were prepared using two methodologies: (i) a green-chemistry approach based on lyophilization combined with hot-pressing and (ii) the film-casting method. Findings: Advantages and limitations of both approaches were investigated by several characterization techniques (morphology, thermal and conductivity studies). Using lyophilization/hot-pressing, waste and chemical derivatives production is prevented (Green Chemistry approach) and uniform and porous-free films with controllable thickness and improved mechanical properties are achievable. Research limitations/implications: Further work regarding the development and application of novel polymer backbones is necessary to reach performances comparable to lithium-based polymer electrolytes in terms of electrical properties (conductivity). Originality/value: This work is in total agreement with the current need of developing alternative materials towards sustainable and environmental friendly post lithium-ion batteries. This global aspiration is supported by the recent re-emerging focus on sodium-ion batteries.

2

Influence of the method of heating/cooling moulds on the properties of injection moulding parts

Postawa P., Kwiatkowski D., Bociaga E.

Archives of Materials Science and Engineering

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2008

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Vol. 31, nr 2

121-124

EN

Purpose: The main purpose of carry out research was estimate the influence thermal conditions of the mould on properties of injection moulded parts. Design/methodology/approach: The properties of structure and mechanical properties of injection moulding parts were determined by many factors. One of them is thermal conditions of tool. Injection mould can be heated or cooling during the process and its depend which kind of polymer we produced and what properties we going to obtain. A few different cooling mould systems were presented in the article and disadvantages and advantages of each of them. Findings: The impact of thermal condition (cooling rate, mould temperature) on the structure and physical properties of injection moulded parts were present. Research limitations/implications: Research was limited to a few thermoplastics polymers. Practical implications: Received and presented results are useful from the point of the view of industrial applications and they are able to contribute to improvement parts obtained using injection moulding technology. Originality/value: Very original microscopic research carry out during cooling stage of polymer and crystallization process.

3

Ultrasonic methods in diagnostics of glass-polyester composites

Wróbel G., Wierzbicki Ł.

Journal of Achievements in Materials and Manufacturing Engineering

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2007

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Vol. 20, nr 1-2

203-206

EN

Purpose: The aim of the work was to find relationship between the ultrasonic wave velocity and the strenght and Young's module in a glass-polyester composite. Design/methodology/approach: The experiments have been performed in three distinct phases. During the first phase, typical glass-polyester composite was ageing to get different mechanical properties. In the second phase, strength and ultrasonic properties of composite was testing. In the last of phases we compare changes of properties. Findings: The experimental results showed relationship between velocity of ultrasonic wave and strength and Young's module. Research limitations/implications: In those applications, in which polymer structural composites were subjected to a heat and mechanical load, it is essential to test the strength characteristics of the composites in the use of non-destructive methods. That enables contemporaneous status check of the structure and makes it possible to replace the bivalent evaluation scale (good - bad) with an incessantly gradable strength degradation scale for a material. Practical implications: The results of the investigation have shown possibility of using ultrasonic method to diagnosis of strength changes in composites. This method allowed to test working parts of machines or buildings, without destruction. Originality/value: The results of the investigations allow to confirm, that ultrasonics can be used to non-destructive testing of the strength and Young's modulus changes.

4

Influence of temperature on the viscoelastic properties of drawn PE pipes

Szymiczek M., Wróbel G.

Journal of Achievements in Materials and Manufacturing Engineering

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2007

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Vol. 20, nr 1-2

287-290

EN

Purpose: Purpose of this paper is to describe the free drawing process of PE pipes in the aspect of time characteristics of the viscoelastic return. Design/methodology/approach: To determine the properties, drawing tests were conducted on chosen PE pipes, using a testing machine station. Pipe samples were preheated to a set temperature and drawn by a fixed drawing die. Changes in the pipe diameter and length of the test section were recorded for the further analysis of the pipe sample. Findings: Obtained dependencies were assumed to be the basis for formulation of conclusions as to the choice of essential process conditions for the technological sequence of PE lining deposition in the outer coating of installation pipes or reconstruction of a transmission channel. Research limitations/implications: Conducted research and their conclusions have a methodological value. They factually correspond to chosen spatial parameters of pipes and dies. Together with parallel tribological research on the conditions in the drawing die zone, they give a basis for building a model of the reverse drawing process with its all complexity. Practical implications: From a practical point of view, the obtained results allow to optimize the expansive deposition process of PE pipes in production of new and renovation of damaged elements of transmission networks - in the latter case, mainly in digless conditions. Originality/value: Original input of these works is determination of simultaneous influence of geometrical properties - the degree of inner diameter reduction of the pipe and the approach angle of the drawing die - and the temperature of the examined material on the time characteristics and participation of plastic strain in the process of viscoelastic after-deformation return.

5

The effect of wood filler behaviour on structure and fracture of polyethylene

Dziadur W., Tabor A.

Journal of Achievements in Materials and Manufacturing Engineering

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2006

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Vol. 17, nr 1-2

53-56

EN

Purpose: The aim of this paper was to investigate the effect of wood filler additions on the microstructure, fractographic features and cracking mechanism of low density polyethylene (LPDE). Design/methodology/approach: For the tests, waste polyethylene from industrial and common films and Lignocel CB 120 wood fibers have been used. Three types of compositions (composites) with 10, 20 and 30% of wood flour have been prepared for the tests. To evaluate the role of used filler conducted it’s quantitative analysis by linear method. Parameters like volume fraction of the filler, the number particles of wood flour per surface area and mean wood fiber diameter, were determinated. Findings: The results of microscopic observations of the etched sections and fractures obtained at room temperature and at liquid nitrogen temperature indicate good matching between the filler particles and the structure of basic polymer, due mainly to bonding of the individual lamellae in spherulites. The reinforced polymer reveals a cracking micromechanism which is called crazing. Research limitations/implications: The further research are required to solve the problem of the filler contrast. Practical implications: From practical point of view, this research can be used to project composites (wood flour – polyethylene). Originality/value: Originality of this work is the fact that stereological measurements shown usefulness this method to estimate filler’s influence of forming microstructure and properties of the investigated composite.

6

Żeliwo ausferrytyczne jako nowoczesne tworzywo konstrukcyjne

Guzik S.E.

Inżynieria Materiałowa

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2003

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R. XXIV, nr 6

677-680

PL

W pracy przedstawiono terminologie związane z żeliwem poddanym hartowaniu z przemianą izotermiczną (ADI), jego mikrostrukturę oraz właściwości mechaniczne. Omówiono możliwość sterowania strukturą tego żeliwa oraz wynikającymi z niej właściwościami mechanicznymi oraz wskazano na różnice w budowie ausferrytu i bainitu w żeliwie ADI. Pokazano zastosowanie żeliwa ADI na odlewy koła przeznaczonego do pracy suwnicy mechanicznej.

EN

The various the terminology of the austempered ductile iron (ADI) process and microstructure as well as mechanical properties are presented in the work. The steering possibilities of microstructure of ADI and consequential of its mechanical properties such as the different types ausferrite and bainite in cast iron have been described. The application of austempered ductile iron has been shown.

7

Kompozyty z surowców wtórnych PET jako nowe tworzywo konstrukcyjne

Jeziórska R.

Kompozyty

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2001

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R. 1, nr 2

233-236

PL

Metodą reaktywnego wytłaczania, z udziałem związku małocząsteczkowego - oksazoliny, opracowano z surowców wtórnych PET nowe tworzywa konstrukcyjne. Morfologię opracowanych gatunków badano elektronowym mikroskopem skaningowym (SEM); wartości temperatury zeszklenia, topnienia i krystalizacji oznaczano metodą różnicowej analizy termicznej za pomocą mikrokalorymetru skaningowego (DSC). Scharakteryzowano wpływ składu kompozytów na właściwości mechaniczne przy rozciąganiu i zginaniu, udarność (Charpy), wskaźnik szybkości płynięcia (MFR), lepkość istotną (IV). Analiza mikrofotografii SEM przełomów wykazała, w odróżnieniu od wyników badań metodą DSC, że mieszaniny charakteryzują się jednorodną strukturą semikrystaliczną.

EN

Structural phases and blends properties of unfilled and filled with glass fiber, combination of glass fiber with glass ball or mica PET scrap/oxazoline functionalised LDPE blends have been investigated in a chemical modification involving reactive extrusion with a ricinoloxazoline maleinate. The interfacial reaction between oxazoline groups in oxazoline grafted LDPE and PET scrap were studied by the differential scanning calorimetry (DSC) and the scanning electron microscopy (SEM). The phase morphology of the blends was of scmicrystalline type according to SEM results (Fig. 1). The most important effects of glass reinforcement are better thermal properties together with higher strength (tensile and flexural) and stiffness (flexural modulus) which indicate many potential applications (Tab. 2). Mica offer high rigidity, low thermal expansion, reduced flammability, increased heat distortion temperature (Tab. 3). The reactive extrusion combined with reinforcing provides a possibility to produce a variety of new high-impact composites by varying the type and concentration of the filler. Cost reduction opportunities of the recipes by using PET waste have also been explored.