| 1. |
- Das, Oisik, et al.
(författare)
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A Novel Way of Adhering PET onto Protein (Wheat Gluten) Plastics to Impart Water Resistance
- 2018
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Ingår i: Coatings. - : MDPI. - 2079-6412. ; 8:11
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Tidskriftsartikel (refereegranskat)abstract
- This study presents an approach to protect wheat gluten (WG) plastic materials against water/moisture by adhering it with a polyethylene terephthalate (PET) film using a diamine (Jeffamine (R)) as a coupling agent and a compression molding operation. The laminations were applied using two different methods, one where the diamine was mixed with the WG powder and ground together before compression molding the mixture into plates with PET films on both sides. In the other method, the PET was pressed to an already compression molded WG, which had the diamine brushed on the surface of the material. Infrared spectroscopy and nanoindentation data indicated that the diamine did act as a coupling agent to create strong adhesion between the WG and the PET film. Both methods, as expected, yielded highly improved water vapor barrier properties compared to the neat WG. Additionally, these samples remained dimensionally intact. Some unintended side effects associated with the diamine can be alleviated through future optimization studies.
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| 2. |
- Das, Oisik, et al.
(författare)
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An Attempt to Find a Suitable Biomass for Biochar-Based Polypropylene Biocomposites
- 2018
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Ingår i: Environmental Management. - : Springer. - 0364-152X .- 1432-1009. ; 62:2, s. 403-413
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Tidskriftsartikel (refereegranskat)abstract
- Four biomass wastes (rice husk, coffee husk, coarse wool, and landfill wood) were added with biochar and polypropylene (PP) to manufacture biocomposites. Individual biomasses were tested for their combustion behavior using cone calorimeter. Biocomposites were analyzed for their fire/thermal, mechanical, and morphological properties. Wood had the most desirable comprehensive effect on both the mechanical and fire properties of composites. In particular, wood and biochar composite exhibited the highest values of tensile/flexural properties with a relatively low peak heat release rate. In general, application of waste derived biochar and biomasses drastically reduced the susceptibility of neat PP towards fire.
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| 3. |
- Das, Oisik, et al.
(författare)
-
The flammability of biocomposites
- 2018
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Ingår i: Durability and Life Prediction in Biocomposites, Fibre-Reinforced Composites and Hybrid Composites. - : Elsevier BV. ; , s. 335-365
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Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
- Keeping sustainability in mind, polymer composites are usually fabricated with biobased materials instead of synthetics. However, these “biocomposites” often lack the required strength and are extremely susceptible to fire. This necessitates the application of fire-retardant treatment, which could render the composite fire resistant. This chapter gives an overview of the types of fire retardants that are generally applied, and a review of studies done to impart fire retardancy in composites. Several instruments and standards used for determining fire behaviors of composites are also described in detail. Biochar (especially made at high pyrolysis temperatures) is very resistant to ignition and thermally stable, owing to its extensive network of cross-linking between adjacent aromatic carbon sheets. Its inclusion in polymeric composites is advantageous for both fire and mechanical properties. The inherent fire-resistant and char-forming ability of wool (a natural protein fiber) has been exploited to develop composites that exhibit the highest degree of flame resistance (V0 rating in UL94 tests). Finally, wheat gluten, a by-product of the cereal industry, has shown potential regarding fire retardancy and thermal stability. Gluten's flame-resistant properties can be made even more potent by applying other additives (e.g., silica).
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| 4. |
- Piri, Imelda Saran, et al.
(författare)
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Imparting resiliency in biocomposite production systems : A system dynamics approach
- 2018
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Ingår i: Journal of Cleaner Production. - : ELSEVIER SCI LTD. - 0959-6526 .- 1879-1786. ; 179, s. 450-459
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Tidskriftsartikel (refereegranskat)abstract
- A biocomposite production system (BPS) contains a wide range of elements that are vulnerable to internal as well as external factors that may stimulate a system to be disrupted. Hence, there is a need to manifest resiliency in order to withstand the inevitable change without affecting its robustness and stability. The three aspects of a resilient BPS are interconnectivity, adaptability and transformability. The interconnectivity concept deals with the reliability and effectiveness of the supply chain network and production systems' resourcefulness. The adaptability aspect reinforces the agility and adjusting capacity of a system towards versatility and flexibility across the range of elements involved in the production system. Transformability deals with the capacity of a system to alter into a new system based on research, innovation and creativity. Therefore, the core aspects of resiliency in a BPS would result in increased stability and effectiveness. System dynamics models have been developed depicting the cause and effect of each of the three aspects. Finally, a model has been presented which could enable researchers and organizations to take guided decision towards a more robust and resilient BPS.
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