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Browsing by Author "John, Maya J"

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Environmental degradation in biocomposites

Author: John, Maya J Date: Jun 2017 The emergence of biocomposites as an alternative to petroleum-based composites has largely been to superior technical properties along with problems associated with depleting petroleum resources and increasing environmental legislations. The ... Read more
Environmental friendly method for the extraction of coir fibre and isolation of nanofibre

Author: Abraham, E ; Deepa, B ; Pothen, LA ; Cintil, J ; Thomas, S ; John, Maya J ; Anandjiwala, R ; Narine, SS Date: Feb 2013 The objective of this work was to develop an environmental friendly method for the effective utilization of coir fibre by adopting steam pre-treatment. The retting of the coconut bunch makes strong environmental problems which can be avoided ... Read more
Fabrication and characterization of various engineered nanomaterials

Author: Mtibe, Asanda ; Mokhothu, Thabang H ; John, Maya J ; Mokhena, Teboho C ; Mochane, MJ Date: Aug 2018 In recent years, there has been growing demand of utilizing nanomaterials to develop new sustainable products. Nanomaterials offer unique extraordinary properties such as high surface area, eco-friendliness and good mechanical and physical ... Read more
Flame retardant treated flax fibre reinforced phenolic composites: Ageing and thermal characteristics

Author: Molaba, TP ; Chapple, Stephen A ; John, Maya J Date: Jan 2018 In this study, flax composites were prepared from flax fabric and phenolic resin. Chemical treatments were imparted to the fabric to improve adhesion between the fabric and the phenolic matrix. Diammonium phosphate was applied to improve the ... Read more
Flammability performance of biocomposites

Author: John, Maya J Date: 2019 Bio-based products have been used in the packaging sector and now there has been a considerable growth in the use of biocomposites in transport (automotive and aerospace) and electronics sector. However, it is imperative that components used ... Read more
Hybrid composites

Author: John, Maya J ; Anandjiwala, RD ; Thomas, S Date: Apr 2009 The incorporation of several different types of fibres into a single matrix has led to the development of hybrid biocomposites. The behaviour of hybrid composites is a weighed sum of the individual components in which there is a more favourable ... Read more
Investigation of the degree of homogeneity and hydrogen bonding in PEG/PVP blends prepared in supercritical CO2: comparison with ethanol-cast blends and physical mixtures

Author: Labuschagne, Philip W ; John, Maya J ; Sadiku, RE Date: Jul 2010 The degree of homogeneity and H-bond interaction in blends of low-molecular-mass poly(ethylene glycols) (PEG, Mw = 400, 600, 1000) and poly(vinylpyrrolidone) (PVP, Mw =9×103) prepared in supercritical CO2, ethanol and as physical mixtures ... Read more
Kenaf-polypropylene composites: effect of amphiphilic coupling agent on surface properties of fibres and composites

Author: John, Maya J ; Bellmann, C ; Anandjiwala, RD Date: Oct 2010 This paper presents an experimental study on the use of zein as a coupling agent in natural fibre composites. Kenaf nonwovens were treated with zein coupling agent, which is a protein extracted from corn. The surface characteristics of untreated ... Read more
Lignocellulosic fiber reinforced rubber composites

Author: John, Maya J ; Anandjiwala, RD ; Thomas, S Date: Apr 2009 Natural Rubber (NR) is a naturally occurring elastomeric polymer of isoprene (2-methyl-1,3-butadiene). It can be extracted from latex of only one kind of tree, the Hevea braziliensis. Hevea rubber is produced in many tropical regions of ... Read more
Mechanical performance of hybrid woven jute-roselle-reinforced polyester composites

Author: Hamdan, MHM ; Siregar, JP ; Thomas, S ; John, Maya J ; Jaafar, J ; Tezera, C Date: May 2019 Natural fibre acts as a significant replacement for the known synthetic fibre that tends to cause critical environmental issues. Hence, the hybridization of natural fibre reinforcement has been considered as one of the strategies in reducing ... Read more
Mechanical, rheological and viscoelastic properties of polysaccharide and protein based aerogels

Author: Lefatle, MC ; John, Maya J Date: Aug 2018 Aerogels are light and porous solid materials derived from gels and find applications in catalysis, wastewater treatment, and in automotive and aerospace industries. Aerogels are considered as a viable bio-based alternative for petroleum ... Read more
Melt-spun polylactic acid fibers: effect of cellulose nanowhiskers on processing and properties

Author: John, Maya J ; Anandjiwala, R ; Oksman, K ; Mathew, AP Date: Apr 2012 Bio-based continuous fibers were processed from polylactic acid (PLA) and cellulose nanowhiskers (CNWs) by melt spinning. Melt compounding of master batches of PLA with 10 wt % CNWs and pure PLA was carried out using a twin-screw extruder in ... Read more
Nanomaterials: Types, synthesis and characterization

Author: Mokhena, Teboho C ; John, Maya J ; Sibeko, MA ; Agbakoba, VC ; Mochane, MJ ; Mtibe, Asanda ; Mokhothu, TH ; Motsoeneng, TS ; Phiri, MM ; Mofokeng, Tladi G Date: Mar 2020 Nanoparticles are generally defined as particles having one or more dimensions of sizes ranging from 1 to 100 nm. Nanoparticles can be classified into organic, inorganic and carbon-based materials. In comparison with conventional micro-size ... Read more
Natural fibre and polymeric matrix composites and their applications in aerospace engineering

Author: Balakrishnan, P ; John, Maya J ; Pothen, L ; Sreekala, MS ; Thomas, S Date: 2016 Fiber-reinforced polymer composite materials are fast gaining ground as preferred materials for construction of aircrafts and space crafts. In particular, their use as primary structural materials in recent years in several technology- ... Read more
Natural fibre-nanocellulose composite filters for the removal of heavy metal ions from water

Author: Mautner, Andreas ; Kwah, Yosi ; Weiland, Katrin ; Mvubu, Mlando B ; Botha, Anton F ; John, Maya J ; Mtibe, Asanda ; Siqueria, Gilberto ; Bismarck, Alexander Date: Jul 2019 Contamination of fresh water sources with heavy metal ions constitutes a serious threat to drinking water safety. Treatment of water in order to remove these contaminants, e.g. copper ions, is thus an important task, usually performed by ... Read more
Natural polymers: an overview

Author: John, Maya J ; Thomas, S Date: Aug 2012 The scarcity of natural polymers during the world war years led to the development of synthetic polymers like nylon, acrylic, neoprene, styrene-butadiene rubber (SBR) and polyethylene. The increasing popularity of synthetic polymers is partly ... Read more
Optimization of pyrolysis conditions for char production from rice husks and its characterization as a precursor for production of activated carbon

Author: Menya, E ; Olupot, PW ; Storz, H ; Lubwama, M ; Kiros, Y ; John, Maya J Date: Mar 2019 Response surface methodology was employed to optimize pyrolysis conditions for production of char with maximum yield, fixed carbon content, and with minimum ash content from Uganda’s New Rice for Africa (NERICA) 1 rice husk variety. The aim ... Read more
Physicomechanical properties of nanocomposites based on cellulose nanofibre and natural rubber latex

Author: Abraham, E ; Deepa, B ; Pothan, LA ; John, Maya J ; Narine, SS ; Thomas, S ; Anandjiwala, R Date: Nov 2012 Cellulose nanofibres (CNF) with diameter 10–60 nm were isolated from raw banana fibres by steam explosion process. These CNF were used as reinforcing elements in natural rubber (NR) latex along with cross linking agents to prepare nanocomposite ... Read more
Poly(lactic acid)-starch/expandable graphite (PLA-starch/EG) flame retardant composites

Author: Mngomezulu, ME ; Luyt, AS ; Chapple, Stephen A ; John, Maya J Date: Jan 2018 This work reports on the effect of commercial expandable graphite (EG) on the flammability and thermal decomposition properties of PLA-starch blend. The PLA-starch/EG composites were prepared by melt-mixing and their thermal stability, volatile ... Read more
Raw and renewable polymers

Author: Joseph, S ; John, Maya J ; Pothen, LA Date: 2010 Biopolymers from renewable resources have attracted much attention in recent years. Increasing environmental consciousness and demands of legislative authorities have given significant opportunities for improved materials from renewable ... Read more

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