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Morozov, E. V.
MRI monitoring and non-destructive quality measurement of polymeric patterns manufactured via stereolithography / E. V. Morozov, M. M. Novikov, V. M. Bouznik // Addit. Manuf. - 2016. - Vol. 12. - P. 16-24, DOI 10.1016/j.addma.2016.05.015 . - ISSN 2214-8604
Кл.слова (ненормированные):
Aging -- Build parameters -- MRI -- Polymers -- Stereolithography
Аннотация: The use of Magnetic Resonance Imaging (MRI) for monitoring, studying and performing output quality measurements of the acrylate-based polymeric patterns manufactured using stereolithography (SL) was introduced in this work. The effects of build parameters and humid environment on sample homogeneity, distribution of crosslink density, stability and defect formation were examined. The spatial resolution of the method was found to be sufficient to identify patterns according to the build parameters used and to detect specific hatch-predicted crosslink density variations. Qualitative information obtained using MRI visualisation was supplemented by quantitative measurements of Nuclear Magnetic Resonance (NMR) relaxation times and 1H NMR spectra. NMR spectroscopy confirmed the identity of the chemical composition among the patterns and showed that the crosslink density variation observed via spatially resolved T2-profiles stems from the difference of the build parameters. Different types of defects in the samples were observed and classified; some defects originated from local matrix continuity failures (partially cured resin trapping within the polymer or bubbles formation), while other defects were found in the form of bulk layering. MRI visualisation coupled with relaxometry and 1H spectroscopy of patterns during their interaction with humidity allowed tracking water distribution inside the sample and observing effects of swelling, fracturing and chemical decomposition. It was found that the initial inhomogeneous structure of the specimen has a crucial role in subsequent fracturing due to non-uniform expansion of the swollen parts. As a result, the approach presented in this work improves the output quality control and current testing techniques, provides insight how physical properties of the 3D parts are affected by different technical parameters, and eventually can help the use of SL technologies for a variety of applications. © 2016 Elsevier B.V.

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Держатели документа:
Kirensky Institute of Physics SB RAS, Krasnoyarsk, Russian Federation
Institute of Chemistry and Chemical Technology SB RAS, Krasnoyarsk, Russian Federation
Institute on Laser and Information Technologies RAS, Shatura, Russian Federation
All-Russian Scientific Research Institute of Aviation Materials, Moscow, Russian Federation

Доп.точки доступа:
Novikov, M. M.; Bouznik, V. M.; Морозов, Евгений Владимирович
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NMR imaging of 3D printed biocompatible polymer scaffolds interacting with water / E. Morozov [et al.] // Rapid Prototyping J. - 2019. - Vol. 25, Is. 6. - P. 1007-1016, DOI 10.1108/RPJ-10-2018-0271. - Cited References: 60. - This research was performed on the equipment of Krasnoyarsk Regional Research Equipment Center of Siberian Branch of Russian Academy of Sciences with the financial support of Russian Foundation for Basic Research (project No14-29-10178 ofi_m). . - ISSN 1355-2546
Кл.слова (ненормированные):
NMR imaging -- Stereolithography -- Chitosan -- Polymer scaffolds -- Tissue engineering
Аннотация: Purpose: Active employment of additive manufacturing for scaffolds preparation requires the development of advanced methods which can accurately characterize the morphologic structure and its changes during an interaction of the scaffolds with substrate and aqueous medium. This paper aims to use the method of nuclear magnetic resonance (NMR) imaging for preclinical characterization of 3D-printed scaffolds based on novel allyl chitosan biocompatible polymer matrices. Design/methodology/approach: Biocompatible polymer scaffolds were fabricated via stereolithography method. Using NMR imaging the output quality control of the scaffolds was performed. Scaffolds stability, polymer matrix homogeneity, kinetic of swelling processes, water migration pathways within the 3D-printed parts, effect of post-print UV curing on overall scaffolds performance were studied in details. Findings: NMR imaging visualization of water uptake and polymer swelling processes during the interaction of scaffolds with aqueous medium revealed the formation of the fronts within the polymer matrices those dynamics is governed by case I transport (Fickian diffusion) of the water into polymer network. No significant difference was observed in front propagation rates along the polymer layers and across the layers stack. After completing the swelling process, the polymer scaffolds retain their integrity and no internal defects were detected. Research limitations/implications: NMR imaging revealed that post-print UV curing aimed to improve the overall performance of 3D-printed scaffolds might not provide a better quality of the finish product, as this procedure apparently yield strongly inhomogeneous distribution of polymer crosslink density which results in subsequent inhomogeneity of water ingress and swelling processes, accompanied by stress-related cracks formation inside the scaffolds. Practical implications: This study introduces a method which can successfully complement the standard tests which now are widely used in either additive manufacturing or scaffolds engineering. Social implications: This work can help to improve the overall performance of the polymer scaffolds used in tissue engineering. Originality/value: The results of this study demonstrate feasibility of NMR imaging for preclinical characterization of 3D printed biocompatible polymer scaffolds. The results are believed to contribute to better understanding of the processes vital for improving the design of 3D-printed polymer scaffolds. © 2019, Emerald Publishing Limited.

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Держатели документа:
Federal Research Center, Krasnoyarsk Scientific Center SB RAS”, Institute of Chemistry and Chemical Technology, Krasnoyarsk, Russian Federation
Federal Research Center “Crystallography and Photonics RAS”, Institute on Laser and Information Technologies, Shatura, Russian Federation
All-Russian Scientific Research Institute of Aviation Materials, Moscow, Russian Federation
Kurnakov Institute of General and Inorganic Chemistry RAS, Moscow, Russian Federation
Federal Research Center “Krasnoyarsk Scientific Center SB RAS”, Kirensky Institute of Physics, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Morozov, E. V.; Морозов, Евгений Владимирович; Novikov, M.; Bouznik, V.; Yurkov, G.
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