Effect of multiple injection moulding on some properties of polycarbonate

• Autorzy: Żenkiewicz M. , Rytlewski P. , Moraczewski K. , Stepczyńska M. , Karasiewicz T. , Richert J. , Ostrowicki W.
• Języki publikacji: EN

Abstrakty

EN

Purpose: The aim of this work was to investigate the influence of multiple (up to 6 times) injection moulding of polycarbonate (PC) on some properties of the obtained moulded pieces. The investigation results are to be used to evaluate the usefulness of the multiple processing of PC and management of the PC technological waste by material recycling. Design/methodology/approach: The investigated samples were obtained during the industrial injection moulding. There were determined the sample mechanical properties (by a tensile test), melt flow rate, temperatures of phase transitions (by differential scanning calorimetry, DSC), temperatures of thermal degradation (by thermogravimetric analysis, TGA), as well as storage modulus and damping coefficient (both by dynamic mechanical analysis, DMA). Findings: After the first and second injection mouldings, minor increases (ca. 2.2 wt.% in sum) in the tensile strength of polycarbonate were observed. After the next injection mouldings, this quantity did not change much. The melt flow rate increased along with the number of injection mouldings. The glass temperature was approximately constant while the other phase transition temperatures decreased by ca. 7° C after the first injection moulding and they did not essentially change after each of the next five processing procedures. The storage modulus and damping coefficient of polycarbonate were not noticeably affected by the number of injection mouldings. Research limitations/implications: In order to confirm the claim that degradation processes, occurring in polycarbonate during the first two injection mouldings, cause an increase in the van der Waals interactions between the polymer macromolecules, further investigation is necessary, mostly that on variations in the mean molecular weight of polycarbonate. Practical implications: The studies carried out by now indicate that there are no arguments not to subject the polycarbonate technological waste to the management by material recycling. Originality/value: The method for calculating the fraction of multi-processed plastic in a final product is presented. It has been observed that the largest changes in the examined properties of polycarbonate occur during its first injection moulding. It is stated that a minor degradation of polycarbonate macromolecules increases slightly its tensile strength, caused probably by enhancement of the van der Waals forces.

Słowa kluczowe

EN

engineering polymers; recycling; mechanical properties; thermal properties

PL

polimery; wtryskiwanie; recykling; właściwości mechaniczne; właściwości termiczne

• Wydawca: International OCSCO World Press
• Czasopismo: Archives of Materials Science and Engineering
• Rocznik: 2009
• Tom: Vol. 37, nr 2
• Strony: 94--101
• Opis fizyczny: Bibliogr. 33 poz.

Twórcy

autor

Żenkiewicz M.

autor

Rytlewski P.

autor

Moraczewski K.

autor

Stepczyńska M.

autor

Karasiewicz T.

autor

Richert J.

autor

Ostrowicki W.

• Department of Materials Science, Kazimierz Wielki University, ul. Chodkiewicza 30, 85-064 Bydgoszcz, Poland,

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