Effects of electron radiation on properties of PLA

• Autorzy: Malinowski R. , Rytlewski P. , Żenkiewicz M.
• Języki publikacji: EN

Abstrakty

EN

Purpose: The aim of the paper was to examine the effects of electron radiation on physicochemical properties of pristine poly(lactic acid) (PLA), or polylactide, and of polylactide containing a selected crosslinking agent. Design/methodology/approach: Samples to be examined were prepared in granulated forms or as moulded pieces and then treated with the high-energy electron radiation (ca. 10 MeV). The methods of gel permeation chromatography (GPC), rheology, Fourier transform infrared (FTIR) spectroscopy, and dynamic mechanical thermal analysis (DMA) were used to determine physicochemical properties of the samples. A humidity sensor was utilised to determine water vapour permeability. Findings: It has been found that PLA undergoes degradation upon the electron radiation. Triallyl isocyanurate (TAIC) when introduced into polylactide causes plasticization of this polymer whereas irradiation of polylactide containing TAIC leads to crosslinking of PLA. Crosslinked PLA exhibits limited plastic flow or no flow at all and an elevated glass transition temperature. Water vapour permeability of a film made of PLA modified this way is much less than that of a film produced from original PLA. Research limitations/implications: Further studies of crosslinked PLA are advisable, especially assessment of the gelation degree, strength of the plasticized material, and biodegradation. Practical implications: Crosslinked PLA may be applied in practical processes, especially in thermoforming in which increased resistance of a material against deformation at elevated temperatures is required. Originality/value: Substantial influence of the electron radiation on properties of PLA was established. The material undergoes significant degradation upon even relatively small radiation doses. In order to crosslink PLA, TAIC in the amount of ca. 3 wt% and the electron radiation doses of up to ca. 60 kGy have to be applied.

Słowa kluczowe

EN

plastics; biodegradation; radiation

PL

tworzywo sztuczne; biodegradacja; promieniowanie

• Wydawca: International OCSCO World Press
• Czasopismo: Archives of Materials Science and Engineering
• Rocznik: 2011
• Tom: Vol. 49, nr 1
• Strony: 25--32
• Opis fizyczny: Bibliogr. 36 poz.

Twórcy

autor

Malinowski R.

autor

Rytlewski P.

autor

Żenkiewicz M.

• Institute for Engineering of Polymer Materials and Dyes, ul. M. Skłodowskiej-Curie 55, 87-100 Toruń, Poland,

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