A Universal Toughening and Energy-Dissipating Strategy for Impact-Resistant 3D-Printed Composites

IF 14.3 1区 材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Xiang Hong, Peng Wang, Yu Ma, Weidong Yang, Junming Zhang, Zhongsen Zhang, Yan Li
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Abstract

3D-printed polymer-based composites are promising for various engineering applications due to high strength-to-weight ratios and design flexibility. However, conventional matrix materials, such as polylactic acid and epoxy resin, often exhibit brittleness and limited impact resistance (< 10 kJ m2). Herein, a universal strategy is reported for enhancing the ductility and impact energy absorption of 3D-printed composites by leveraging the dynamic crosslinking of B─O dative bonds. To validate its effectiveness, a smart composite (PLA/SSG) comprising shear-stiffening gel fillers embedded in a polylactic acid matrix is designed and its rate-dependent mechanical adjustability along with 3D printability is evaluated. The resulting composite shows significant improvements in impact resistance, ductility, and strength-ductility balance. Specifically, the multiple crack and localized plastic yielding of polylactic acid matrix induced by shear-stiffening gel fillers enables PLA/SSG with a 40-times increase in ductility; the “soft-hard” phase transition of shear-stiffening gel induced by B─O bonds endows PLA/SSG with a 330% improvement in impact energy absorption. This B─O bonds-inspired strategy provides a universal approach for printing smart impact-resistant composites and structures.

Abstract Image

抗冲击3d打印复合材料的通用增韧和耗能策略。
由于高强度重量比和设计灵活性,3d打印聚合物基复合材料在各种工程应用中前景广阔。然而,传统的基体材料,如聚乳酸和环氧树脂,往往表现出脆性和有限的抗冲击性(< 10 kJ m- 2)。本文报道了一种通用策略,通过利用B─O键的动态交联来增强3d打印复合材料的延展性和冲击能量吸收。为了验证其有效性,设计了一种智能复合材料(PLA/SSG),其中包括嵌入聚乳酸基质的剪切硬化凝胶填料,并评估了其速率相关的机械可调性以及3D打印性。所得到的复合材料在抗冲击性、延展性和强度-延性平衡方面有显著改善。其中,剪切加筋凝胶填料引起的聚乳酸基体的多重裂纹和局部塑性屈服使PLA/SSG的延性提高了40倍;B─O键诱导的剪切硬化凝胶的“软硬”相变使PLA/SSG的冲击能吸收提高330%。这种受B─O键启发的策略为打印智能抗冲击复合材料和结构提供了一种通用方法。
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来源期刊
Advanced Science
Advanced Science CHEMISTRY, MULTIDISCIPLINARYNANOSCIENCE &-NANOSCIENCE & NANOTECHNOLOGY
CiteScore
18.90
自引率
2.60%
发文量
1602
审稿时长
1.9 months
期刊介绍: Advanced Science is a prestigious open access journal that focuses on interdisciplinary research in materials science, physics, chemistry, medical and life sciences, and engineering. The journal aims to promote cutting-edge research by employing a rigorous and impartial review process. It is committed to presenting research articles with the highest quality production standards, ensuring maximum accessibility of top scientific findings. With its vibrant and innovative publication platform, Advanced Science seeks to revolutionize the dissemination and organization of scientific knowledge.
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