Rong Deng, Lulu Ren, Dandan Su, Jingkui Yang, Jinbo Jin, Ting Lei, Kaizhou Zhang, Shuhao Qin
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引用次数: 0
Abstract
A thermally induced phase separation method was successfully developed to prepare spherical composite nylon 12 (PA12)/Nano-silica (Nano-SiO2) powder. By comparing the performance of pure PA12 and composite PA12 powders, it was found that the introduction of Nano-SiO2 can improve the sphericity of the composite PA12 powder, with a median particle size of 54–70 μm. Moreover, the presence of Nano-SiO2 can induce the formation of more α-phase during the crystallization of PA12, and most of Nano-SiO2 was coated by PA12 molecular chains during the solidification crystallization process, which improved the crystallization temperature and crystallinity of the composite PA12 powder. When the amount of Nano-SiO2 was 0.3 wt%, the composite PA12 powder had the highest crystallinity, and the powder spreading performance was the best.
Graphical abstract
Mechanism diagram of the reaction between PA12 and Nano-SiO2. In this figure, it was found that Nano-SiO2 was treated with silane coupling agent can form siloxane, so that amino groups were grafted to the surface of Nano-SiO2. The amino groups can react with carboxyl groups in PA12 to form amide bonds, thereby improving the interfacial adhesion between nano silica and PA12 matrix and enhancing their compatibility. Meanwhile, by comparing the microstructure before and after addition, it was found that the addition of Nano-SiO2 increased the sphericity of the powder, and the powder particle size increased from 55.2 to 68.71 μm.
期刊介绍:
Journal of Materials Research (JMR) publishes the latest advances about the creation of new materials and materials with novel functionalities, fundamental understanding of processes that control the response of materials, and development of materials with significant performance improvements relative to state of the art materials. JMR welcomes papers that highlight novel processing techniques, the application and development of new analytical tools, and interpretation of fundamental materials science to achieve enhanced materials properties and uses. Materials research papers in the following topical areas are welcome.
• Novel materials discovery
• Electronic, photonic and magnetic materials
• Energy Conversion and storage materials
• New thermal and structural materials
• Soft materials
• Biomaterials and related topics
• Nanoscale science and technology
• Advances in materials characterization methods and techniques
• Computational materials science, modeling and theory