Influence of Calcium Carbonate Fillers on the Properties of Recycled Poly(e-caprolactone) Based Thermoplastic Polyurethane
| Autor: | Vitalija BETINGYTĖ, Kristina ŽUKIENĖ, Virginija JANKAUSKAITĖ, Daiva MILAŠIENĖ, Kazys Vytautas MICKUS, Ada GULBINIENĖ |
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| Jazyk: | angličtina |
| Rok vydání: | 2012 |
| Předmět: | |
| Zdroj: | Medžiagotyra, Vol 18, Iss 3, Pp 243-249 (2012) |
| Druh dokumentu: | article |
| ISSN: | 1392-1320 2029-7289 |
| DOI: | 10.5755/j01.ms.18.3.2433 |
| Popis: | In this work the effects of different crystallographic modifications of calcium carbonate (CaCO3) filler on the melt flow, mechanical properties, hydrolytic degradation, and shape memory behaviour of recycled low-temperature poly(e-caprolactone)-based polyurethane (rTPU) were evaluated. Composites were prepared by two-roll milling varying filler content from 2 wt % to 6 wt %. It was found that at temperature range from 20 °C to 50 °C CaCO3 fillers do not change Young’s modulus, they decrease tensile stress and deformation of rTPU, but improve its mechanical properties at elevated temperatures (up to 65 °C). rTPU melt flow index increases due to chain scission during the recycling and filler mixing with mill. Therefore, destruction temperature of rTPU is 20 °C lower than that of TPU. The CaCO3 does not change shape memory properties independently of filler type and transition from secondary shape to the primary shape at 70 °C temperature is completed within 17 s for both filled and unfilled rTPU. The investigation of hydrolytic degradation shows that CaCO3 only slightly increases degradation rate of rTPU.DOI: http://dx.doi.org/10.5755/j01.ms.18.3.2433 |
| Databáze: | Directory of Open Access Journals |
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