期刊
APPLIED SCIENCES-BASEL
卷 8, 期 10, 页码 -出版社
MDPI
DOI: 10.3390/app8101960
关键词
chemical blowing agent; poly(lactic acid) foam; foam extrusion
类别
资金
- New National Excellence Program of the Ministry of Human Capacities [UNKP-17-4-III]
- National Research, Development and Innovation Office [NVKP_16-1-2016-0012]
This study presents the applicability of different types (exothermic and endothermic) of chemical blowing agents (CBAs) in the case of poly(lactic acid) (PLA). The amount of foaming agent is a fixed 2 wt%. We used a twin-screw extruder and added the individual components in the form of dry mixture through the hopper of the extruder. We characterized the PLA matrix and the chemical blowing agents with different testing methods. In case of the produced foams we carried out morphological and mechanical tests and used scanning electron microscopy to examine cell structure. We showed that PLA can be successfully foamed with the use of chemical blowing agents. The best results were achieved with an exothermic CBA and with PLA type 8052D. The cell population density of PLA foams produced this way was 4.82 x 10(5) cells/cm(3), their expansion was 2.36, their density 0.53 g/cm(3) and their void fraction was 57.61%.
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