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2 Journal of Achievements in Materials and Manufacturing Engineering

2 2008

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Microstructure and mechanical properties of Polypropylene/Polycarbonate blends

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

Journal of Achievements in Materials and Manufacturing Engineering

2008

Vol. 27, nr 1

19-22

Purpose: Researches, which are presented in this paper, consider the effect of chosen different weight ratios polycarbonate blended in a polypropylene matrix (PP/PC) at variable injection moulding conditions and its effect on the microstructure, and also on fracture and flexural properties. Design/methodology/approach: Composites contain between 0 and 30 wt% of polycarbonate and changes at constant rate of 10wt%. Specimens were produced with advantage of melt manipulation technology, further called as non-conventional injection moulding technique (SCORIM). Then, the results were compared with conventional injection moulding, as a result of comparison structure development and mechanical behaviour. Fracture and flexural tests were done on universal testing machine-Instron. The structure sample appearance was observed in polarized light microscope. Findings: PC addition influence on energy absorption and flexural modulus. There are also visible microstructure changes. The SCORIM technique have a significant influence on mechanical properties. Higher settings of those processing variables give higher values of energy at break and flexural modulus. Research limitations/implications: Further work contains research of termomechanical indices to establish straightforward connection between mechanical properties and processing set-ups. Other mechanical properties will be assessed. Practical implications: The improvement of mechanical response is clearly visible by using SCORIM technique and increasing a percentage polycarbonate volume. Originality/value: The Shear Controlled Injection Moulding technique is based on the in-mould shear melt manipulation during the solidification phase. This technology is very important for morphology manipulation and the improvement on the mechanical polymer system properties.

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

2008

Vol. 31, nr 1

71-76

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.