期刊
POLYMERS
卷 12, 期 2, 页码 -出版社
MDPI
DOI: 10.3390/polym12020463
关键词
thermally expandable microspheres; physical blowing agent; poly (lactic acid) foam; d-lactide; foam extrusion; syntactic foam structure
资金
- New National Excellence Program of the Ministry for Innovation and Technology [UNKP-19-4]
- Hungarian Academy of Sciences
- National Research, Development and Innovation Office [NVKP_16-1-2016-0012]
- BME-Nanonotechnology FIKP grant (BME FIKP-NAT)
This study presents the investigation of different content of thermally expandable microsphere (EMS) type of a physical blowing agent added to polylactic acid (PLA). The effects of the different doses of EMS, processing temperatures, and d-lactide content of the polylactic acid were analyzed for foam properties and structures. We characterized the different PLAs and the physical blowing agent with different testing methods (gel permeation chromatography, rotational rheometry, isothermal thermogravimetric analysis, and thermomechanical analysis). The amounts of the foaming agent were 0.5, 1, 2, 4, 8 wt%, and processing temperatures were 190 degrees C, 210 degrees C, and 230 degrees C. The foam structures were produced by twin-screw extrusion. We used scanning electron microscopy to examine the cell structure of the foams produced, and carried out morphological and mechanical tests as well. The result of extrusion foaming of PLA using different amounts of EMS shows that an exponentially decreasing tendency of density reduction can be achieved, described by the following equation, rho(x)=1.062e(-x/7.038)+0.03 (R-2 = 0.947) at 190 degrees C. With increasing processing temperature, density decreases at a lower rate, due to the effect that the microspheres are unable to hold the pentane gas within the polymer shell structure. The d-lactide content of the PLAs does not have a significant effect on the density of the produced foam structures.
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