Aging and Biodegradation of Biocomposites

Mary, Siji K.; Pillai, Prasanth Kumar Sasidharan; Amma, Deepa Bhanumathy; Pothen, Laly A.; Thomas, Sabu

doi:10.1002/9783527652457.ch26

Cited by 2 publications

(1 citation statement)

References 76 publications

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“…Chitosan is also a biodegradable and renewable biopolymer, derived from deacetylation of the biopolymer chitin, which is the third most abundant polysaccharide in the world (after cellulose and hemicellulose). 22 Traditionally, when chitosan is directly used in water purification, it is mostly effective in adsorbing negatively charged dyes 23 and heavy anions 24 in acidic conditions as a result of protonated amine groups. In this work, we use chitosan as a green cross-linker by taking advantage of its amine groups as functional moieties participating in the formation of covalent bonds.…”

Section: ■ Introductionmentioning

confidence: 99%

Reusable Green Aerogels from Cross-Linked Hairy Nanocrystalline Cellulose and Modified Chitosan for Dye Removal

2016

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A novel biopolymer-based aerogel was developed by freeze-drying a hydrogel, synthesized from cross-linking bifunctional hairy nanocrystalline cellulose and carboxymethylated chitosan through a Schiff base reaction. The nanocelluloses, bearing aldehyde and carboxylic acid groups, facilitated the cross-linking with chitosan through imine bond formation while providing negatively charged functional groups, and chitosan was modified to accommodate carboxylic acid. The potential of this bioaerogel in environmental remediation was examined in a model system comprising methylene blue, a cationic dye. Electrostatic complexation between acidic groups on the anionic aerogel with the dye resulted in time-dependent dye adsorption, with long-time equilibrium dye concentration fitting well to the Langmuir isotherm, yielding a maximum adsorption capacity of ∼785 mg g and equilibrium constant K ∼ 0.0089 at room temperature. Dynamics of adsorption was modeled by numerically solving the unsteady-state diffusion-adsorption mass balance in a 1D spherical coordinate, which attested to a diffusion-controlled process with a Langmuir adsorption time constant τ ∼ 7.6 s. To the best of our knowledge, this bioaerogel exhibits the highest removal capacity as yet for any reusable adsorbents prepared from biopolymers. Successful adsorption-regeneration cycles proved an excellent reusability, and the adsorption capacity remained constant over a wide pH range (e.g., pH > 7). This work may pave the way toward ultralight green functional materials.

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Section: ■ Introductionmentioning

confidence: 99%

Reusable Green Aerogels from Cross-Linked Hairy Nanocrystalline Cellulose and Modified Chitosan for Dye Removal

2016

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Development of biodegradable natural rubber latex composites by employing corn derivative bio‐fillers

Jayathilaka

Ariyadasa

Egodage

2020

J of Applied Polymer Sci

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This study aims to investigate the viability of employing corn‐based fillers (powdered corn grain [CG], corn flour [CF] and cornstarch [CS]) to improve the biodegradability of natural rubber latex (NRL) composites by varying filler loading from 0 to 50 phr. Notable variation in both physical and mechanical properties were observed for the different filler types, with CG‐filled NRL demonstrating the better adhesion with NRL. Thus, CG‐filled composites were selected for investigation of biodegradability. Increased CG loading in NRL compounds enhanced biodegradation; with over 70% degradation observed for 50 phr CG loading upon 15 weeks of soil burial. However, the trade‐off between mechanical properties and biodegradability limits the CG loading in the NRL matrix to 20 phr for manufacturing NRL‐based products. It was observed that NRL with CG filler loading of 20 phr conforms to the ASTM D3578 standard for manufacturing rubber gloves; with 50% biodegradation upon 15 weeks of soil burial.

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Aging and Biodegradation of Biocomposites

Cited by 2 publications

References 76 publications

Reusable Green Aerogels from Cross-Linked Hairy Nanocrystalline Cellulose and Modified Chitosan for Dye Removal

Reusable Green Aerogels from Cross-Linked Hairy Nanocrystalline Cellulose and Modified Chitosan for Dye Removal

Development of biodegradable natural rubber latex composites by employing corn derivative bio‐fillers

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