Liu Hao, Chen Simin, Li Chengdi, Chen Xiao, Li Jinbo, Chen Ping, Xie Fuzhen, Jian Huihua, Huang Xiaoying, Liu Lei
Xinyu Key Laboratory of Materials Technology and Application for Intelligent Manufacturing, School of Mechanical and Electrical Engineering, Xinyu University, Xinyu 338004, China.
Polymers (Basel). 2023 Oct 12;15(20):4066. doi: 10.3390/polym15204066.
Recently, material extrusion (MEX) 3D printing technology has attracted extensive attention. However, some high-performance thermoplastic polymer resins, such as polycarbonate (PC), cannot be processed by conventional MEX printing equipment due to poor processing performance. In order to develop new PC-based printing materials suitable for MEX, PC/poly(butylene adipate-co-terephthalate) (PBAT) blends were prepared using a simple polymer blending technique. It was found that the addition of PBAT component significantly improved processing performance of the PC, making the blends processable at 250 °C. More importantly, the PC was completely compatible with the PBAT, and the PBAT effectively reduced the T of the blends, endowing the blends with essential 3D printing performance. Furthermore, methyl methacrylate-butadiene-styrene terpolymer (MBS) was introduced into the PC/PBAT blends to improve toughness. SEM observations demonstrated that MBS particles, as stress concentration points, triggered shear yielding of polymer matrix and absorbed impact energy substantially. In addition, the MBS had little effect on the 3D printing performance of the blends. Thus, a PC/PBAT/MBS blend system with favorable comprehensive mechanical properties and 3D printing performance was achieved. This work can provide guidance for the development of novel MEX printing materials and is of great significance for expanding the variety of MEX printing materials.
最近，材料挤出（MEX）3D打印技术引起了广泛关注。然而，一些高性能热塑性聚合物树脂，如聚碳酸酯（PC），由于加工性能差，无法用传统的MEX打印设备进行加工。为了开发适用于MEX的新型PC基打印材料，采用简单的聚合物共混技术制备了PC/聚（己二酸丁二醇酯-co-对苯二甲酸丁二醇酯）（PBAT）共混物。发现添加PBAT组分显著改善了PC的加工性能，使共混物在250℃下可加工。更重要的是，PC与PBAT完全相容，PBAT有效地降低了共混物的玻璃化转变温度，赋予共混物基本的3D打印性能。此外，将甲基丙烯酸甲酯-丁二烯-苯乙烯三元共聚物（MBS）引入PC/PBAT共混物中以提高韧性。扫描电子显微镜观察表明，MBS颗粒作为应力集中点，引发了聚合物基体的剪切屈服并大量吸收冲击能量。此外，MBS对共混物的3D打印性能影响很小。因此，获得了具有良好综合力学性能和3D打印性能的PC/PBAT/MBS共混体系。这项工作可为新型MEX打印材料的开发提供指导，对于扩大MEX打印材料的种类具有重要意义。
