Nylon 12 composite powder prepared by thermally induced phase separation for selective laser sintering

IF 2.7 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY
Rong Deng, Lulu Ren, Dandan Su, Jingkui Yang, Jinbo Jin, Ting Lei, Kaizhou Zhang, Shuhao Qin
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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.

Abstract Image

通过热诱导相分离制备用于选择性激光烧结的尼龙 12 复合粉末
成功开发了一种热诱导相分离方法,用于制备球形尼龙 12(PA12)/纳米二氧化硅(Nano-SiO2)复合粉末。通过比较纯 PA12 和复合 PA12 粉末的性能,发现引入 Nano-SiO2 可以提高复合 PA12 粉末的球形度,中值粒径为 54-70 μm。此外,纳米二氧化硅的存在能促使 PA12 在结晶过程中形成更多的 α 相,在凝固结晶过程中,大部分纳米二氧化硅被 PA12 分子链包覆,从而提高了复合 PA12 粉末的结晶温度和结晶度。当 Nano-SiO2 的用量为 0.3 wt% 时,复合 PA12 粉末的结晶度最高,铺粉性能最好。图中发现,纳米二氧化硅经硅烷偶联剂处理后可形成硅氧烷,使氨基接枝到纳米二氧化硅表面。氨基可与 PA12 中的羧基反应形成酰胺键,从而改善纳米二氧化硅与 PA12 基体的界面粘附性,提高两者的相容性。同时,通过比较添加前后的微观结构发现,纳米二氧化硅的添加增加了粉末的球形度,粉末粒径从 55.2 μm 增加到 68.71 μm。
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来源期刊
Journal of Materials Research
Journal of Materials Research 工程技术-材料科学:综合
CiteScore
4.50
自引率
3.70%
发文量
362
审稿时长
2.8 months
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
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