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Improving dispersion and delamination of graphite in biodegradable starch materials via constructing cation-π interaction: Towards microwave shielding enhancement

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Journal of Materials Science & Technology 2022年第34期129卷 196-205页

作者： Yi Yang Jun-Ru Tao Dian Yang Qian-Ming He Xu-Dong Chen Ming Wang Chongqing Key Laboratory of Soft-Matter Material Chemistry and Function Manufacturing School of Chemistry and Chemical EngineeringSouthwest UniversityChongqing 400715China Key Laboratory of Polymer Composite and Function Materials of Ministry of Education Key Laboratory for Designed Synthesis and Applied Polymer MaterialsSchool of Chemistry and Chemical EngineeringSun Yat-sen UniversityGuangzhou 510275China

Herein, a low-cost, biodegradable, and high-performance microwave shielding graphite/starch material was fabricated via constructing a cation-π interaction between ammonium ions and graphite. The graphite flakes and starch were firstly mixed with distilled water containing ammonium hydroxide to form graphite/starch slurry under an ultrasonic assistant. The cation-π interaction could improve delamination degree and dispersion of graphite in starch matrix. The slurry was first used as a coating material on the surface of wood and paper to develop shielding packages. The effect of coating thickness and coating layers on EM shielding property of the materials was investigated. Second, the composites with a high orientation of graphite were fabricated by compression at high pressures. The electrical conductivity and EM shielding effectiveness(SET) of the materials were greatly enhanced by construction of cation-πinteraction and orientation of graphite. Specifically, the EM SETvalues increased from 56.9 to 66.8 d B for the composites with 50 wt.% graphite and 2.0 mm in thickness by constructing cation-π interaction. The EM SETvalues raised from 17.4 to 66.8 d B via the graphite orientation in the materials with the same components and thickness. The shielding mechanism of the compressed composites with orientation dispersion of graphite was also discussed in comparison to the coating layer with random dispersion of graphite.

关键词： Electromagnetic shielding Graphite Starch bio-degradable Cation-πinteraction

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Fabrication and Optical Characterization of Palm Fiber Reinforced Acrylonitrile Butadiene Styrene Based Composites: Band Gap Studies

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Materials Sciences and Applications 2018年第2期9卷 246-257页

作者： Budrun Neher Md. Mahbubur Rahman Bhuiyan Humayun Kabir Md. Abdul Gafur Farid Ahmed Department of Physics Jahangirnagar University Dhaka Bangladesh Department of Physics Saga University Saga Japan PP and PDC Bangladesh Council of Scientific and Industrial Research Dhaka Bangladesh

The composite materials are replacing the conventional materials, owing to their excellent properties. The developments of new materials are on the anvil and are thriving day by day. Natural fiber composites such as palm fiber (PF) polymer composites became more enchanting because of their high specific strength, low weight and biodegradability. Mixing of natural fiber like PF with acrylonitrile butadiene styrene (ABS) polymer is finding increased applications. In this work, PF reinforced ABS composites PF-ABS was fabricated by Injection Moulding Machine. The effect of UV-Visible radiation on PF-ABS composites was studied by means of ultraviolet-visible spectroscopy in the wavelength 200 - 1000 nm at room temperature. The present investigation shows that the addition of palm fiber modifies the absorption property of the materials. The absorption ability is maximal for 10% PF-ABS composites while minimal for 20% PF-ABS composites in the visible region of the spectrum. Optical constant like direct band gap energy, Urbach energy and Steepness parameter were determined using absorbance data. The values of direct energy band gap, Urbach energy as well as Steepness parameter were found to be in the range 2.6 - 3.9 eV, 0.40 - 0.85 eV and 0.03 - 0.06, respectively. It was observed that the value of direct band gap energy as well as Urbach energy is higher while the value of Steepness parameter is lower for PF-ABS composites with 10% palm fiber.

关键词： Palm Fiber UV-Visible Spectroscopy Band Gap bio-degradable

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Lactic Acid-Sustainable Raw Material for biodegradable Hot Melt Adhesive: Review

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Open Journal of Organic Polymer Materials 2022年第3期12卷 31-45页

作者： Ravindra V. Gadhave Super Bond Adhesives Private Limited Thane India

Currently, due to scarcity of hydrocarbon resources and the extensive use of water based, solvent based and hot melt adhesives in wood bonding in furniture industries and packaging industries that demand recyclability, compostability and bio-degradability, recently attention has been concentrated to making these formulations completely bio-based, sustainable and biodegradable. biodegradable hot melt adhesives (HMAs) prepared from natural sources have a potential for use in furniture and packaging industries because of an increase in awareness of environmental issues, the replacement of conventional petroleum-derived hydrocarbon raw materials by renewable, biodegradable and sustainable materials has developed. In terms of environmental issues, such as climate crisis due to an increase of carbon dioxide emission, attempts have been made to produce HMAs using non-hydrocarbon resins, such as polylactic acid (PLA)-based resins, containing no petroleum as a raw material. Polylactic acid was prepared by self-condensation reactions of lactic acid or by lactide ring opening polymerisation, and used for packaging materials, sanitary pads, diapers etc., especially adhesives owing to its excellent processability and the excellent mechanical properties of its HMAs products. Therefore, recently the use of PLA materials as a substitute for non-biodegradable hydrocarbon-based polymers can be considered to be environmentally favourable. Here, we discussed the various uses of PLA as a sustainable and bio-degradable and sustainable hot melt adhesive.

关键词： Lactic Acid Hot Melt Sustainable bio-degradable Adhesive

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Preparation and Applications of biodegradable Mulch

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Agricultural Science & Technology 2014年第6期15卷 1035-1036,1064页

作者：徐磊郑洪倩唐玉邦虞利俊江苏省农业科学院农业设施与装备研究所江苏南京210014

[Objective] The aim was to introduce preparation methods of biodegradable mulch of starch, and analyze the comprehensive properties, including structure, me- chanical property and degradation. [Method] Environmental factors of biodegradable mulch of starch and common mulch were collected to make analysis and compar- isons on temperature, ground temperature, and illumination intensity with different mulches. Furthermore, the germination rates of broach bean and garlic were mea- sured with mulches covered. [Result] The comprehensive property of biodegradable mulch of starch performed better. [Conclusion] The biodegradable mulch of starch could reduce environmental pollutions and the application would be recommended.

关键词： bio-degradable Ground mulch Appiication property

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A brief review on natural fiber used as a replacement of synthetic fiber in polymer composites

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Materials Engineering Research 2019年第2期1卷 86-97页

作者： Fatin I. Mahir Kamrun N. Keya Bijoyee Sarker Khandakar M. Nahiun Ruhul A. Khan Institute of Radiation and Polymer Technology Bangladesh Atomic Energy Commission Dhaka 1349 Bangladesh National Institute of Textile Engineering and Research Nayarhat Savar Dhaka 1350 Bangladesh

The use of composites in different sectors has become inevitable due to the enhancement in properties, reduction in the manufacturing cost and suitability to several applications. Among different classifications, polymeric composites are mainly focused on their use as structural components and the selection and composition of reinforcement play a vital role in determining the characteristics of the composite. Although composites are developed with man-made reinforcement in the beginning stage, in the present situation, natural reinforcements have proved excellent results in terms of properties. Hence, nowadays researches are mainly focused on the use of different natural fibers in different forms as reinforcements in polymeric composite. This work presents a brief overview on the properties of natural fiber and natural fiber reinforced composites which is an emerging area in polymer science. Interests in natural fiber is reasonable due to the advantages of these materials compared to others, such as synthetic fiber composites, including low environmental impact and low cost and support their potential to be used. Moreover, the disadvantage of the synthetic and fiber-glass as reinforcement, the use of natural fiber reinforced composite gained the attention of the young scientists, researchers, and engineers and are being exploited as a replacement for the conventional fiber such as glass, aramid, carbon etc. Natural fibers have been proven alternative to synthetic fiber in transportation such as automobiles, railway coaches and aerospace, military, building, packaging, consumer products and construction industries for ceiling paneling, partition boards etc. However, in development of these composites, some drawbacks have also emerged. In this paper, it has been tried to overview all of this together.

关键词： natural fiber synthetic fiber polymer composite composite and bio-degradable

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