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Recent Works from Composite Lab

A little Description


My research mainly deals with establishing the structure-property relationship between natural fiber, and it's reinforced composite. In my Ph.D. work, I have chosen Sunn Hemp natural fiber which belongs to Bast or stems fibers' family. In the structural study, I mostly emphasize Scattering, vibrational, morphology, and macromolecular investigation. To study the physical properties of the fiber-reinforced composite, I mostly do the mechanical and electrical investigation. So interestingly, I am proud that I am a part of a macromolecular family as the natural fiber are nothing but natural Polymers. So I perform Small Angle X-Ray Scattering (SAXS) to find out the macromolecular behavior of the fiber. Before passing the specimen to any kind of characterization techniques, my aim is to stabilize the molecular structure of fiber by some necessary surface treatments. These treatments anticipate to enhance the fiber structure to give them aid to have better adhesion with the required matrix in order to produce composites.

  • Natural polymer

  • Cellulose/Natural Fiber/Filler

  • Diffraction

  • Morphology

  • Spectroscopy

  • Surface Modification

  • Mechanical properties

  • Energy Storage

  • Structure-Property Study

Some published work

Influence of pretreatment on mechanical

Raw Sunn Hemp reinforced Epoxy Composite (RSHC)

DSHC Dewaxed Sunn Hemp Composit.jpg

This is my 1st research paper published online in 2020 under JOURNAL OF COMPOSITE MATERIAL where I showed how a simple purification to the fiber can change its structure and can also modify the physical properties of the composite. This work was about the dewaxing of Sunn Hemp fiber where I used ethanol and benzene as a promoter. After the treatment, the results we achieved were quite significant. 

The image I have shown here was a dielectric comparison study between the RSHC and DSHC.  Compared to RSHC, the DSHC yields less Dielectric Constant and Dielectric Loss values which are associated with the removal of foreign with intrinsic impurities, non-cellulosic amorphous elements, and lessening the polar molecules from sunn hemp fiber that discount the effectivity of space charge and dipolar polarization. 


You can access this whole paper from this link.

Dewaxed Sunn Hemp reinforced Epoxy Composite (DSHC)

This is an AIP conference proceeding published online in 2019 which was a combined accomplishment of me and one of our project students. This paper got some quite interesting results in its structural investigation. Here we treated the chicken eggshells with NaOH dilute solution with various concentrations and passed under the basic characterization like XRD and FTIR. But we did not notice any significant changes in the patterns except for increasing the intensity level. But we found a change in mechanical properties.

When loading was performed by the load cell on the composite specimen during the test, there was a better and homogeneous stress transfer from matrix to reinforcement and also a proper mixing of CES particle within NaOH solution in case of 10 % treated eggshell reinforced composite which managed to have a better mechanical and chemical interlocking at the interface. There was a failure that occurred beyond 10% of the treatment and was attributed to a low degree of polymerization in the polymer. 


You can access this whole paper from this link. 

Mercerization effect on bio-waste eggshe

Effect of NaOH treatment on the flexural strength of untreated and treated Chicken Egg Shell

A mechanical and dielectric study on calcium hydroxide.jpg

This is the second paper of mine published online in 2020 which was a combined accomplishment of me and one of our project students. In this paper, we worked on disposed natural Kapok husk to study its various properties. The Kapok Husk was treated chemically and physically by Ca(OH)2 and microwave respectively. We structurally investigated the properties of fiber, where mechanically and dielectrically investigated the properties of reinforced composites. Here one of the properties of fiber (XRD) is briefly described.  

This is the XRD pattern of untreated, Ca(OH)2 and microwave treated kapok husk fillers. The degree of crystallinity was calculated by Herman's method,

Upon microwave treatment, the crystallinity gradually increases from 30 to 43% which justifies the growth and rearrangement of crystalline polymer chains from the particle due to the elimination of impurities. Again, treatment with Ca(OH)2, the cellulose crystallinity of kapok husk reduces to 40% from microwave-treated fillers but still exhibits a noteworthy mark compared to untreated fillers.

You can download this whole paper from this link. 


The following paper which studied the dielectric and charge transport behaviour in alkali treated Sunn Hemp fiber reinforced composite. The paper is published in jOURNAL OF NATURAL FIBER in the year of 2021. In this piece study, the Sunn Hemp fiber is treated various alkali concentrations (5, 10, 15, and 20 wt %) and the soaking periods (2 hr, 4 hr, 6 hr, 8 hr, and 10 hr). Dielectric constant and loss (tan δ) are found to be less in 10% treated composite soaked for 6 hr (10 K6) and may attribute to the decline of water affinity polar groups that result in reducing the effect of space charge polarization. The ac conductivity investigation of composites results in an increasing trend accompanied by the concentrations and soaking time, revealing the evolution of charge carriers in the amorphous phase due to excess alkali supply to the fiber. 

There is a schematic process proposed that explained the reaction between the cellulose and epoxy resin.

You can download this whole paper from this link. 


Hydrolysis of KOH


Reaction between cellulose and dissociative KOH


The reaction between mercerized cellulose and epoxide group of epoxy during the curing process in composites

Composites yield from Composite Lab

Research Publication

  1. Chinmayee Dash, Asim Das and Dillip Kumar Bisoyi. "Influence of pretreatment on mechanical and dielectric properties of short sunn hemp fiber-reinforced polymer composite in correlation with fine structure of the fiber",  J ournal of Composite Materials. 2020, Vol. 54(23) 3313–3327. DOI: 10.1177/0021998320914071.

  2. Chinmayee Dash & Dillip Kumar Bisoyi. "Study on Dielectric and charge transport behavior in alkali-treated randomly oriented Sunn Hemp Fiber Reinforced epoxy composite in connection with the microstructure of fiber". Journal of Natural Fibers, 2021. DOI: 10.1080/15440478.2021.1907830

  3. Dillip Kumar Bisoyi, Sujit Kumar Oram & Chinmayee Dash. "A mechanical and dielectric study on calcium hydroxide pre-treated Kapok Husk reinforced epoxy composites". Polymer Bulletin, 2021

  4. Chinmayee Dash & Dillip Kumar Bisoyi. "Experimental Investigation of Structural Stabilization in Sunn Hemp Fiber and its Influence on Flexural, Tensile, Electrical Properties of Reinforced Composite". Journal of Material Science: Materials in Electronics,2022.

  5.  Chinmayee Dash and Dillip Kumar Bisoyi. " Microwave Radiation Technique for the Isolation of Sunn Hemp Natural   Fiber in the Application of Material Processing". 2022,591,121706.

  6.  Chinmayee Dash, Ramyaranjan Das, T. Umasankar Patro, Dillip Kumar Bisoyi. "Investigation of macromolecular properties of pretreated Natural Sunn Hemp fiber by using correlation function" (under investigation)


Conferrence Publication

  1. C. Dash, A. Das, S. Behera, D.K. Bisoyi, Mercerization Effect on Bio-waste Eggshell Reinforced Polymer Composite for Energy Saving Application. AIP Conference Proceedings 2142, 070002 (2019);

  2. Chinmayee Dash and Dillip Kumar Bisoyi  ‘Significance of Dielectric and Mechanical Properties on Fiber Loading of Sunn Hemp Reinforced Epoxy Composite’ AIP Conference Proceedings 2220, 080027 (2020);

  3. Chinmayee Dash and Dillip Kumar Bisoyi, ‘A study on the structure-property relationship of microwave irradiated Sunn Hemp fiber and its environmentally conditioned polymer composite’. IOP Conf. Series: Materials Science and Engineering 798 (2020) 012015 doi:10.1088/1757-899X/798/1/012015

  4. Chinmayee Dash and Dillip Kumar Bisoyi, ‘Isolation of Sunn Hemp fiber by microwave irradiation and its effect on reinforced epoxy composite for electrical application’. Materials today proceedings (2022)

Book Chapter

C Dash, A. Das, D. K Bisoyi, High-Intensity Ultrasonication (HIU) Effect on Sunn Hemp Fiber Reinforced Epoxy Composite: A Physico-chemical Treatment towards Fiber Surface.

Publication –“Natural Polymers Perspectives and Applications for a Green Approach”

Edition - 1st Edition

First Published - 2022

Pub. Location - New York

Imprint - Apple Academic Press


Pages - 336

eBook -  ISBN9781003130765

Reviewer of Journal

  • International Journal of Basic and Applied Sciences

  • Asian Journal of Research in Animal and Veterinary Sciences

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