Thermal, structural and mechanical analysis of polymer/clay nanocomposites with controlled degradation

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• 作者：Alicja Rapacz-Kmita ; Marcin Gajek…
• 关键词：Clay ; Nanocomposites ; Degradation ; Mechanical properties ; DSC ; XRD
• 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：389-398
• 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

The aim of this study was to investigate the influence of the addition of smectite clay fillers to a polylactide matrix on the physical properties of the nanocomposites thus created, studied during the degradation process. A small amount of nanofiller (3–10 mass %) was used, and the clay was additionally modified with organic ammonium salt for better compatibility with the polymer matrix. Crystallisation, glass transition and melting temperature of the nanocomposites were investigated, and the resulting thermal, structural and mechanical properties were compared to those of a neat polylactide. The degradation process of the materials was examined during immersion in distilled water at 80 °C for 60 days using differential scanning calorimetry (DSC), thermogravimetric analysis (TG), X-ray diffraction (XRD) and scanning electron microscopy (SEM). Macroscopic changes were monitored and mechanical properties tested prior to degradation to evaluate the ability of the modified clay filler to reinforce the polymer and enhance elastic modulus, mechanical strength and Brinell hardness. The influence of the modified smectite filler on the thermal, mechanical and structural properties of the nanocomposites during degradation and its dependence on filler content were discussed and confirmed in the study. It was found that the addition of 3 mass% of the clay filler provides an increase of nearly 20 % in tensile strength, with improved stiffness. It was also found that the addition of organically modified clay to the polymer matrix significantly changes the hydrolytic degradation mechanisms of the polylactide, the crystallinity of the polymer and its degradation rate, depending on the amount of the filler.