Wyniki wyszukiwania - BazTech

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Polymer Composites Used in Rapid Prototyping Technology

Bulanda Katarzyna, Oleksy Mariusz, Oliwa Rafał, Budzik Grzegorz, Markowski Tadeusz

Advances in Manufacturing Science and Technology

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2020

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Vol. 44, nr 1

15--20

EN

New materials and filaments dedicated to 3D printing were obtained using the fused deposition modeling method, and the properties of the produced materials were investigated. Polylactide was used as a polymer base for the assays because of the desired properties of the polymer, mainly biodegradability, and the matrix was refilled by the addition of metallic nanofillers, such as bronze, copper, brass, and steel. For the composites obtained, mechanical properties were investigated to determine the dependence of the obtained results on the content and type of filler used and on the method of fabrication of the fittings. It was found that the additives present in the polymer matrix increased the fluidity of the material. The best results were obtained for the compositions with bronze and steel in which the mass flow rate was 72.97 and 79.99 g/10 min, respectively. The filled material that had lower hardness was measured by Rockwell and the impact strength was measured by Charpy. In addition, it was found that injection-molded parts obtained much better mechanical properties than those obtained by 3D printing.

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Badania wybranych mieszanin polimerowych przetwarzanych w laboratoryjnych i przemysłowych warunkach recyklingu

Królikowski B.

Przemysł Chemiczny

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2012

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T. 91, nr 8

1564-1567

PL

Przedstawiono wyniki badań procesu przetwarzania polietylenu (PE) i polistyrenu (PS) metodą wytłaczania w warunkach laboratoryjnych, symulujących recykling rzeczywisty, i w warunkach recyklingu rzeczywistego. W obu przypadkach stosowano wytłaczarki dwuślimakowe współbieżne (W2W) z układami uplastyczniającymi o budowie modułowej, o podobnej konfiguracji segmentów. Przebadano także wybrane niekompatybilizowane mieszaniny obu polimerów z punktu widzenia wpływu rodzaju przetwarzania na zmiany właściwości termicznych i reologicznych.

EN

Original and waste polyethylene (PE), polystyrene (PS) and their blends (85:15 and 15:85) were processed by optional mech. grinding, then granulation in lab. and com. extruders and finally by injection molding to prep. the test samples. The viscosity of PE wastes decreased during the grinding and increased during extrusion (also in the blends) in contrary to PS wastes.

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Development of microstructure affected by in-mould manipulation in polymer composites and nanocomposites

Bilewicz M., Viana J. C., Dobrzański L. A.

Journal of Achievements in Materials and Manufacturing Engineering

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2008

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Vol. 31, nr 1

71-76

EN

Purpose: Investigation of microstructure of polymer nanocomposites subjected to high shear rates during solidification phase. Design/methodology/approach: Injection moulding technique combined with specially designed mould gives possibility to manipulate solidifying polymer or polymer's mixture inside cavity mould. Findings: Significant increment of fracture energy depending of applied conditions including melt temperature and time of shearing of polymer blend. Research limitations/implications: Obtained nanocomposites contain better mechanical properties comparing to polymer composites and application of SCORIM technique brought satisfying and improved results comparing to conventional methods. Practical implications: Implicated advanced technique to conventional injection moulding gives high performance material with good increased toughness and nanoplatteled particles, uniformly distributed, thanks to the applied technique, inside matrix well reinforce final products. Originality/value: SCORIM technique is rarely used technology and has influence on creation and development of morphology of processed materials.

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Thermal effects due to variation of pressure in molten polymers

Kiljański T., Budzyński P., Gałąź R.

Polish Journal of Chemical Technology

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2003

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Vol. 5, nr 4

58-59

EN

The variations of temperature during compression of molten polymers: polyethylene, methyl polymethacrylate, hard and plasticized polyvinyl chloride compounds were investigated in the range of pressure up to about 1600 bars. Their specific heat and coefficient of thermal expansion were also evaluated. The measured increase of temperature proved similar for all materials but they differ considerably from the values calculated from theoretical equation 1. It seems that eq. 1 does not take into account some phenomena which influence the thermal effects of compression but are not connected with the coefficient of thermal expansion.