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Mr. Lizhe He
Univeristy of Nottingham Ningbo China

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Research Keywords & Expertise

0 Additive Manufacturing
0 Polymer Composites
0 phosphate glasses
0 Biomaterials And Medical Devices
0 biodegradable implants

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Journal article
Published: 10 April 2021 in Polymers
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Management of waste from carbon fibre composites has become a significant societal issue as the application of composite grows across many industries. In this study, carbon fibres (CF) were successfully recovered from cured carbon fibre/epoxy (CF/EP) prepreg under microwave pyrolysis at 450, 550 and 650 °C followed by oxidation of any residual char. The recovered fibres were investigated for their tensile properties, surface morphologies and the elements/functional groups presented on the surface. The chemical compositions of gaseous and oil pyrolysis products were also analysed. The microwave pyrolysis effectively pyrolyzed the epoxy (EP) resin. Char residue remained on the fibre surface and the amount of char reduced as the pyrolysis temperature increased. Compared to virgin fibres, the recovered fibre suffered from a strength reduction by less than 20%, and this reduction could be mitigated by reducing the pyrolysis temperature. The surface of recovered fibre remained clean and smooth, while the profile of elements and functional groups at the surface were similar to those of virgin fibres. The main gaseous products were CO, H2, CO2 and CH4, whilst the liquid product stream included phenolic and aromatic compounds.

ACS Style

Siqi Hao; Lizhe He; Jiaqi Liu; Yuhao Liu; Chris Rudd; Xiaoling Liu. Recovery of Carbon Fibre from Waste Prepreg via Microwave Pyrolysis. Polymers 2021, 13, 1231 .

AMA Style

Siqi Hao, Lizhe He, Jiaqi Liu, Yuhao Liu, Chris Rudd, Xiaoling Liu. Recovery of Carbon Fibre from Waste Prepreg via Microwave Pyrolysis. Polymers. 2021; 13 (8):1231.

Chicago/Turabian Style

Siqi Hao; Lizhe He; Jiaqi Liu; Yuhao Liu; Chris Rudd; Xiaoling Liu. 2021. "Recovery of Carbon Fibre from Waste Prepreg via Microwave Pyrolysis." Polymers 13, no. 8: 1231.

Journal article
Published: 15 January 2021 in Polymers
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Composites of biodegradable phosphate glass fiber and polylactic acid (PGF/PLA) show potential for bone tissue engineering scaffolds, due to their ability to release Ca, P, and Mg during degradation, thus promoting the bone repair. Nevertheless, glass degradation tends to acidify the surrounding aqueous environment, which may adversely affect the viability and bone-forming activities of osteoblasts. In this work, MgO was investigated as a neutralizing agent. Porous network-phase gyroid scaffolds were additive-manufactured using four different materials: PLA, MgO/PLA, PGF/PLA, and (MgO + PGF)/PLA. The addition of PGF enhanced compressive properties of scaffolds, and the resultant scaffolds were comparably strong and stiff with human trabecular bone. While the degradation of PGF/PLA composite induced considerable acidity in degradation media and intensified the degradation of PGF in return, the degradation media of (MgO + PGF)/PLA maintained a neutral pH close to a physiological environment. The experiment results indicated the possible mechanism of MgO as the neutralizing agent: the local acidity was buffered as the MgO reacted with the acidic degradation products thereby inhibiting the degradation of PGF from being intensified in an acidic environment. The (MgO + PGF)/PLA composite scaffold appears to be a candidate for bone tissue engineering.

ACS Style

Lizhe He; Xiaoling Liu; Chris Rudd. Additive-Manufactured Gyroid Scaffolds of Magnesium Oxide, Phosphate Glass Fiber and Polylactic Acid Composite for Bone Tissue Engineering. Polymers 2021, 13, 270 .

AMA Style

Lizhe He, Xiaoling Liu, Chris Rudd. Additive-Manufactured Gyroid Scaffolds of Magnesium Oxide, Phosphate Glass Fiber and Polylactic Acid Composite for Bone Tissue Engineering. Polymers. 2021; 13 (2):270.

Chicago/Turabian Style

Lizhe He; Xiaoling Liu; Chris Rudd. 2021. "Additive-Manufactured Gyroid Scaffolds of Magnesium Oxide, Phosphate Glass Fiber and Polylactic Acid Composite for Bone Tissue Engineering." Polymers 13, no. 2: 270.

Article
Published: 20 June 2019 in Journal of Polymer Science
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Phosphate glass/polylactide (PG/PLA) composites were additively manufactured via fused deposition modeling. The incorporation of 10 wt % PG particles improved the flexural modulus of composites by ~14% (3.53 GPa) but led to 5% reduction in flexural strength (92.4 MPa). The trend was more pronounced as the particle loading doubled. Comparing to a particulate composite of the same weight fraction, milled PG fibers (PGFs) reinforcement led to more effectively improved flexural modulus (~30%, 4.10 GPa). After 28 days of in vitro degradation in phosphate buffered saline, the particulate composites lost more than 30% of their initial mechanical properties, in contrast to less than 10% reduction of strength/modulus reported from fiber reinforced composites. The additively manufactured PG/PLA matrix composites have potential for application as customized bone fixation plates to repair the fractures under modest load‐bearing applications. © 2019 The Authors. Journal of Applied Polymer Science published by Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 48171.

ACS Style

Lizhe He; Jiahui Zhong; Chenkai Zhu; Xiaoling Liu. Mechanical properties andin vitrodegradation behavior of additively manufactured phosphate glass particles/fibers reinforced polylactide. Journal of Polymer Science 2019, 136, 1 .

AMA Style

Lizhe He, Jiahui Zhong, Chenkai Zhu, Xiaoling Liu. Mechanical properties andin vitrodegradation behavior of additively manufactured phosphate glass particles/fibers reinforced polylactide. Journal of Polymer Science. 2019; 136 (44):1.

Chicago/Turabian Style

Lizhe He; Jiahui Zhong; Chenkai Zhu; Xiaoling Liu. 2019. "Mechanical properties andin vitrodegradation behavior of additively manufactured phosphate glass particles/fibers reinforced polylactide." Journal of Polymer Science 136, no. 44: 1.