Preparation of PA12 microspheres with tunable morphology and size for use in SLS processing
Preparation of PA12 microspheres with tunable morphology and size for use in SLS processing
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DOI：
10.1016/j.matdes.2015.08.083
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发表时间：
2015-12
影响因子：
8.4
通讯作者：
Wang Gexia;Ping Wang;Zhichao Zhen;Wei Zhang;J. Ji
中科院分区：
文献类型：
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作者：
Wang Gexia;Ping Wang;Zhichao Zhen;Wei Zhang;J. Ji
材料技术是当前选择性激光烧结(SLS)的一大挑战。制备各种材料的新方法的发展引起了产业界和学术界的极大关注。在这项工作中，我们描述了一种简单的策略，通过改进的相分离过程来制备聚酰胺12(PA12)微球。以聚乙烯吡咯烷酮为分散剂，在尼龙12切片的甲酸溶液中加入乙醇进行相分离。通过调节乙醇加入量和相分离温度，制得的PA12微球的平均直径在几十微米到几百微米之间。差示扫描量热仪的进一步研究表明，在微球形成过程中，PA12的烧结窗口在结晶起始温度和熔融起始温度之间发生了显著的拉长。PA12的颗粒大小和形貌，以及微球较宽的烧结窗口，表明所得的PA12粉末适合于SLS工艺。
Materials technology is currently a great challenge in selective laser sintering (SLS). The development of new method for the preparation of a variety of materials has drawn great attention from both industrial and academic organizations. In this work, we described a simple strategy to prepare polyamide 12 (PA12) microspheres through a modified phase-separation process. The phase separation was conducted by adding ethanol as a poor solvent into a formic acid solution of PA12 pellets with polyvinyl pyrrolidone as a dispersant. The mean diameters of the obtained PA12 microspheres, ranging from tens to hundreds of micrometers, were well controlled by adjusting the amount of ethanol and the phase separation temperature. Further investigation by differential scanning calorimetry demonstrated that the sintering window for PA12, between the onset temperatures of crystallization and melting, was drastically stretched during the microsphere formation process. The PA12 particle size and morphology, together with the wider sintering window of the microspheres, demonstrated that the obtained PA12 powder was suitable for SLS processing.