Fabrication of PLA/CB composites with excellent electrical conductivity and stiffness-ductility balance based on coupling extensional stress with thermal field
Qiu-Yang Wei , Yi-Duo Fang , Zhao-Bo Sun , Ying Zeng , Jie Zhang , Jun Lei , Ling Xu , Hao Lin , Gan-Ji Zhong , Zhong-Ming Li
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引用次数: 0
Abstract
A newfound scalable strategy of “annealing stretching-thermal treatment” is proposed to tune electrical conductivity and stiffness-ductility balance of polylactide/carbon black (PLA/CB) conductive composites. The extensional stress-induced orientation and crystallization lead to a significant increase in tensile strength (from 69.3 MPa to 102.0 MPa) and elongation at break (from 9.8 % to 48.7 %). Further thermal treatment effectively reconstructs the conductive network destroyed by the strong extensional stress, causing a sharp increase in electrical conductivity to 5.75 S/m, which is surprisingly ∼ 109 higher than that of neat PLA (5.61 × 10-9 S/m). Besides, the ductility (44.3 %) and strength (97.8 MPa) are well preserved after thermal treatment, attributed to the preservation of oriented amorphous phase and the perfection of oriented crystals, respectively. Moreover, the heat resistance is also improved after thermal treatment. This work could provide significant guidance for facile and efficient fabrication of high-performance bio-based conductive polymer composites.
期刊介绍:
Composites Part A: Applied Science and Manufacturing is a comprehensive journal that publishes original research papers, review articles, case studies, short communications, and letters covering various aspects of composite materials science and technology. This includes fibrous and particulate reinforcements in polymeric, metallic, and ceramic matrices, as well as 'natural' composites like wood and biological materials. The journal addresses topics such as properties, design, and manufacture of reinforcing fibers and particles, novel architectures and concepts, multifunctional composites, advancements in fabrication and processing, manufacturing science, process modeling, experimental mechanics, microstructural characterization, interfaces, prediction and measurement of mechanical, physical, and chemical behavior, and performance in service. Additionally, articles on economic and commercial aspects, design, and case studies are welcomed. All submissions undergo rigorous peer review to ensure they contribute significantly and innovatively, maintaining high standards for content and presentation. The editorial team aims to expedite the review process for prompt publication.