Influence of inorganic fillers on PLA crystallinity and thermal properties
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- 作者：Elvira Vidović ; Fabio Faraguna ; Ante Jukić
- 关键词：Melt mixing ; Solution mixing ; Calcium carbonate ; Barium sulfate ; Mica
- 刊名：Journal of Thermal Analysis and Calorimetry
- 出版年：2017
- 出版时间：January 2017
- 年：2017
- 卷：127
- 期：1
- 页码：371-380
- 全文大小：
- 刊物类别：Chemistry and Materials Science
- 刊物主题：Physical Chemistry; Analytical Chemistry; Polymer Sciences; Inorganic Chemistry; Measurement Science and Instrumentation;
- 出版者：Springer Netherlands
- ISSN：1588-2926
- 卷排序：127
文摘
Polylactide (PLA) composites with three types of fillers, calcium carbonate, barium sulfate, and mica, have been prepared. Methods of preparation were melt mixing in a Brabender plasticorder at 190 °C and solution mixing in chloroform. The concentration of added fillers was: 0.1, 1, and 5 mass% (only by melt mixing). Thermal properties of prepared composites were investigated by differential scanning calorimetry (DSC) and thermogravimetric analysis. The dispersity of filler in matrix was examined by scanning electron microscopy. There was no agglomeration in any composites. Results of DSC analysis reveal the influence of preparation method on thermal transitions. By the melt mixing method, the introduced filler hindered crystallization but caused mostly just a slight increase in Tg relative to pure PLA (57.4 °C). By solution-mixing method, the absence of crystallization is noticed in all samples. Concurrently composites displayed Tg higher for ca. 5–6 °C relative to pure PLA (53.3 °C), with the exception of composite with smallest content of calcium carbonate nanofiller. Thermal stability is improved in all composites, regardless of the filler used and preparation method. It is especially pronounced regarding decomposition temperature (5 mass% loss) where the increase ranges from 11 up to 55 °C in case of melt mixing and 17–35 °C for solution mixing.