Effect of die structure on the properties of self-reinforced polypropylene/noil ramie fiber composites prepared by solid
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ORIGINAL PAPER
Effect of die structure on the properties of self‑reinforced polypropylene/noil ramie fiber composites prepared by solid‑state extrusion Suwei Wang1,2 · Zhenwei Shi1,2 · Jianchen Cai3 · Yun Ding1 · Wenqiang Yan2 · Ping Xue2 · Jimin He2 Received: 14 June 2020 / Accepted: 6 October 2020 © The Polymer Society, Taipei 2020
Abstract In this work, the self-reinforced polypropylene (PP)/noil ramie fiber (NRF) composites were prepared by the solid-state extrusion method. And the effect of die structure such as draw ratio and conical angle on the morphology, thermal and mechanical properties of samples was investigated. The results indicated that the solid-state deformation of PP/NRF composites conducted below the melt transition promoted the formation of the orderly arranged microfibrils inside the samples, which arranged along the extrusion direction and could be observed by scanning electron microscopy (SEM). Besides, the increased draw ratio and conical angle both contributed to the higher degree of orientation, which was obvious observed inside the sample prepared at the draw ratio of 5 and conical angle of 20°. The thermal properties tested by differential scanning calorimetry (DSC) also suggested that the intensified orientation of microfibrillar structure not only demonstrated the transformation of the spherulitic crystal into the aligned chain crystals, but also resulted in the enhanced crystallinity and narrowed melting peak. Moreover, the highly oriented fibrillar bundle structure endowed the samples with the excellent tensile strength and flexural strength, which were up to 80.9 MPa and 83.5 MPa respectively and increased by 182.8% and 102.7% compared with the commonly extruded samples. Keywords Polypropylene · Noil ramie fiber · Solid-state extrusion · Self-reinforcement · Unidirectional orientation
Introduction During the past decades, the natural fibers with low density and environmental benefit [1–3] have been widely applied as the substitute of glass fiber and carbon fiber to reinforce the composites, which were often named after wood-polymer composites (WPCs). Besides, the abundant availability and excellent biodegradability also endow the composites reinforced by natural fibers with low prime cost and good Suwei Wang and Zhenwei Shi contributed equally to this work. * Yun Ding [email protected] 1
College of Materials Science and Engineering, Beijing University of Chemical Technology, North Third Ring Road 15, Chaoyang District, Beijing 100029, China
2
College of Mechanical and Electrical Engineering, Beijing University of Chemical Technology, Beijing 100029, China
3
College of Mechanical Engineering, Quzhou University, Zhejiang 324000, China
recyclability, which lead to the great potential value in the fields of building, furniture, automobile and packaging. Hence, the applications of composites reinforced by natural fibers have attracted much attention from researchers, and natural fibers are compounded with various polymers by different methods in relevant stud
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