3D‐Printed Functional Polymers and Nanocomposites: Defects Characterization and Product Quality Improvement

Alo, Oluwaseun Ayotunde; Tonder, PJM van; Mauchline, David; Otunniyi, Iyiola Olatunji

doi:10.1002/adem.202101219

Cited by 10 publications

(5 citation statements)

References 286 publications

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“…The thermal stability of LC-CNT is slightly weaker than that of CNT, with a thermal weight loss step between 200 °C and 300 °C, and a thermal weight loss of around 6 wt % at 300 °C, which is attributed to the thermal decomposition of surfaceassembled 7CB. [34,35] Figure 1e shows the differential scan-ning calorimetry (DSC) curves of 7CB, CNT and LC-CNT. 7CB exhibits typical thermotropic liquid crystal characteristics, and obvious endothermic peaks appear at 34.5 °C and 44.8 °C, corresponding to the transition of 7CB from solid state to liquid crystal state and from liquid crystal state to isotropic liquid state, respectively.…”

Section: Characterizations Of 7cb Cnt and Lc-cntmentioning

confidence: 99%

Electric‐Field‐Induced Alignment of Functionalized Carbon Nanotubes Inside Thermally Conductive Liquid Crystalline Polyimide Composite Films

Ruan,

Shi,

Zhang

et al. 2023

Angew Chem Int Ed

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The positive liquid crystals, 4'‐heptyl‐4‐biphenylcarbonitrile (7CB), are used to functionalize carbon nanotubes (LC‐CNT), which can be aligned in the liquid crystalline polyimide (LC‐PI) matrix under an alternating electric field to fabricate the thermally conductive LC‐CNT/LC‐PI composite films. The efficient establishment of thermal conduction pathways in thermally conductive LC‐CNT/LC‐PI composite films with a low amount of LC‐CNT is achieved through the oriented alignment of LC‐CNT within the LC‐PI matrix. When the mass fraction of LC‐CNT is 15 wt%, the in‐plane thermal conductivity coefficient (λ∥) and the through‐plane thermal conductivity coefficient (λ⊥) of the LC‐CNT/LC‐PI composite films reach 4.02 W/(m·K) and 0.55 W/(m·K), which are 90.5% and 71.9% higher than those of the intrinsically thermally conductive LC‐PI films respectively, also 28.8% and 5.8% higher than those of the CNT/LC‐PI composite films respectively. Meanwhile, the thermally conductive LC‐CNT/LC‐PI composite films also possess excellent mechanical and heat resistance properties. The Young’s modulus and the heat resistance index are 2.3 GPa and 297.7oC, respectively, which are higher than the intrinsically thermally conductive LC‐PI films and the thermally conductive CNT/LC‐PI composite films under the same amount of CNT.

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Section: Characterizations Of 7cb Cnt and Lc-cntmentioning

confidence: 99%

Electric‐Field‐Induced Alignment of Functionalized Carbon Nanotubes Inside Thermally Conductive Liquid Crystalline Polyimide Composite Films

Ruan,

Shi,

Zhang

et al. 2023

Angew Chem Int Ed

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“…Ahmed and Mehta (2015), Kuo (2011) Additive manufacturing Most people refer to this trend as 3D printing; it is used during manufacturing by organizations when designing product prototypes and parts that are more complex and require more time and resources. Alo et al (2022)…”

Section: Big Data Analyticsmentioning

confidence: 99%

An Assessment of The Use of Quality 4.0 Trends in Higher Education Institutions in South Africa

Bakama¹,

Sukdeo²,

Ramdass³

et al. 2023

Proceedings of the International Conference on Industrial Engineering and Operations Management

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The fourth industrial revolution (4IR) has brought many changes in our lives, and we must adapt in different ways. Quality 4.0 is also part of the change. 4IR affected how organizations perceive quality; how has it affected the higher education sector in South Africa? This is the question this study attempts to answer. The study aimed to assess the use of quality 4.0 trends in higher education institutions in South Africa. To best achieve the study, The following objectives were listed: (1) To identify the most used quality 4.0 trends in higher education institutions in South Africa;(2) To highlight the respondents' perspective on quality 4.0 and finally; (3) To recommend ways to a successful implementation of quality 4.0 in higher education institutions. The study followed a quantitative approach using a questionnaire to collect data from 300 respondents mixed between staff and students from higher education institutions. Descriptive and inferential statistics were used to analyze data. To assess the reliability of the questionnaire, Cronbach's alpha was used. The study revealed that quality 4.0 is a relatively new field in South Africa, both on the business and academic levels. In addition, most of the respondents are not familiar with the quality 4.0 concept but are familiar with its trends. From the most used trend in higher education institutions, the top five were: Online social platforms (YouTube, WhatsApp, Zoom, etc.), IoT, Simulation, AR and Big data analytics.

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“…Recent developments have extended the materials manufacturing library thanks to the numerous advantages of photopolymerisation (also known as photocuring or photocrosslinking and mainly used for thermoset resins). Therefore, various 3D printers have been used, including stereolithography (SLA), digital light processing (DLP), continuous liquid interface printing (CLIP), two-photon absorption (TPA), liquid crystal display (LCD) and volumetric 3DP (V3DP) [13][14][15][16]. On the other hand, material jetting techniques, such as continuous ink jetting (CIJ) and drop-on-demand (DoD), have attracted significant attention due to several advantages for their printed components, such as multicolour materials, good surface finish, high dimensional accuracy and homogeneous mechanical properties [17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Liquid-Based 4D Printing of Shape Memory Nanocomposites: A Review

Alsaadi

Hinchy

McCarthy

et al. 2023

JMMP

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Significant advances have been made in recent years in the materials development of liquid-based 4D printing. Nevertheless, employing additive materials such as nanoparticles for enhancing printability and shape memory characteristics is still challenging. Herein, we provide an overview of recent developments in liquid-based 4D printing and highlights of novel 4D-printable polymeric resins and their nanocomposite components. Recent advances in additive manufacturing technologies that utilise liquid resins, such as stereolithography, digital light processing, material jetting and direct ink writing, are considered in this review. The effects of nanoparticle inclusion within liquid-based resins on the shape memory and mechanical characteristics of 3D-printed nanocomposite components are comprehensively discussed. Employing various filler-modified mixture resins, such as nanosilica, nanoclay and nanographene, as well as fibrous materials to support various properties of 3D printing components is considered. Overall, this review paper provides an outline of liquid-based 4D-printed nanocomposites in terms of cutting-edge research, including shape memory and mechanical properties.

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3D‐Printed Functional Polymers and Nanocomposites: Defects Characterization and Product Quality Improvement

Cited by 10 publications

References 286 publications

Electric‐Field‐Induced Alignment of Functionalized Carbon Nanotubes Inside Thermally Conductive Liquid Crystalline Polyimide Composite Films

Electric‐Field‐Induced Alignment of Functionalized Carbon Nanotubes Inside Thermally Conductive Liquid Crystalline Polyimide Composite Films

An Assessment of The Use of Quality 4.0 Trends in Higher Education Institutions in South Africa

Liquid-Based 4D Printing of Shape Memory Nanocomposites: A Review

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