Effect of microwave argon plasma on the glycosidic and hydrogen bonding system of cotton cellulose

Prabhu, S.; Krishnakumar, V.; Anitha, S.

doi:10.1016/j.carbpol.2016.08.057

Cited by 25 publications

(13 citation statements)

References 12 publications

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“…Similar to those found for scCO 2 TPS, the intensities of O-H stretching and bending bands of scCO 2 TPS 100 GA x were also considerably larger than those of the corresponding TPS 100 GA x . It is also worth noting that the absorption bands centered at 1043 cm -1 (C-O stretching) of TPS and TPS 100 GA x specimens shifted to 1046 cm - [27,75,76] originally present in TPS and TPS 100 GA x specimens. As reported by several investigators [51,53,72], the extremely high diffusivities and low viscosities of scCO 2 can lead to effective plasticization for the amorphous regions of starch granules, and favor water and glycerol penetration in the amorphous and crystalline regions of starch (see Figures 6).…”

Section: Characterization 321 Fourier Transform Infrared Spectroscopymentioning

confidence: 94%

Melt-processing, moisture-resistance and strength retention properties of supercritical CO2-processed thermoplastic starch resins

Peng

Kuo

Huang

et al. 2018

Express Polym. Lett.

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This paper represents the first report of thermoplastic starch (scCO 2 TPS) and glutaraldehyde (GA) modified TPS resins (scCO 2 TPS 100 GA x), gelatinized and/or modified with the aid of supercritical carbon dioxide (scCO 2). The melt flow rate, initial and retention values of tensile strength (σ f) of TPS and GA-modified TPS prepared using scCO 2 fluid were considerably higher than those of TPS and TPS 100 GA x materials prepared in the conventional way. After conditioning at 20°C/50% RH for 56 days, the σ f of properly prepared scCO 2 TPS 100 GA 0.1 still remained at 17.5 MPa, which is around 3.5 times of that of the corresponding conditioned TPS 100 GA 0.1. The moisture contents of conditioned scCO 2 TPS and scCO 2 TPS 100 GA x were considerably lower than those of the corresponding TPS and TPS 100 GA x aged for the same amounts of time. Conditioned scCO 2 TPS and scCO 2 TPS 100 GA x exhibited only V h-type crystals with melting temperatures ~20°C lower than those of corresponding conditioned TPS and TPS 100 GA x. In comparison to TPS and TPS 100 GA x , more dissociated amylopectin chains with loosely hydrogen-bonded-OH groups and significantly less retrogradation was found for conditioned scCO 2 TPS and scCO 2 TPS 100 GA x .

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Section: Characterization 321 Fourier Transform Infrared Spectroscopymentioning

confidence: 94%

Melt-processing, moisture-resistance and strength retention properties of supercritical CO2-processed thermoplastic starch resins

Peng

Kuo

Huang

et al. 2018

Express Polym. Lett.

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“…For drop test, the specimens were placed over the top of a beaker and a drop of water was dropped on the surface of specimen (from 1 cm above the surface of sample) and the absorbance time (thorough absorption) of the water drop was recorded [41].…”

Section: Characterization Techniquesmentioning

confidence: 99%

Preventing the collapse of 3D bacterial cellulose network via citric acid

et al. 2018

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Bacterial cellulose (BC) is a three-dimensional interconnected network of biosynthesized nanofibers. Its rehydration potential would be reduced significantly after its first drying, as a result of entanglement and jamming of cellulose polymer chains. Consequently, its versatility would be also reduced to some limited applications in which repeated water absorbance potential is not of great importance. This study aims to prevent the drawback of carboxylic bridging/cross-linking between cellulose polymer chains. Ten-day-cultured BC pellicles were immersed in various citric acid solutions (as bridging agent) and cured at 160 °C for 5 min. The formation of bridges was confirmed using attenuated total reflection-fourier transform infrared spectroscopy. Scanning electron microscope images showed that there is a different porosity bridged/cross-linked BC specimens (XBC). According to Brunauer-Emmett-Teller analysis, the surface area of XBC (20 w/v % with catalyst) got 87.5 times larger than that of the unbridged/pristine BC (PBC). X-ray diffraction patterns showed no change of crystallinity of XBC in comparison with PBS. The thickness and wettability of XBC samples were 137 and 3.27 times more than PBC samples orderly. Furthermore, the water swelling rate increased significantly for XBC in comparison with PBC. Meanwhile, treated samples had lower elongation and strength than normal BC. The conclusion is that XBC could conserve its repeated absorbency potential after the presented process.

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“…Plasma treatment of cellulose has been intensively studied for the textile and paper industry and other fields, for different purposes like cleaning, sterilization, activation, increased hydrophilicity or hydrophobicity [ 19 , 20 , 21 , 22 , 23 , 24 , 25 ]. Plasma pretreatment is very efficient for the activation of textile surfaces [ 19 , 20 ].…”

Section: Introductionmentioning

confidence: 99%

Treatment of Nanocellulose by Submerged Liquid Plasma for Surface Functionalization

et al. 2018

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Tailoring the surface properties of nanocellulose to improve the compatibility of components in polymer nanocomposites is of great interest. In this work, dispersions of nanocellulose in water and acetonitrile were functionalized by submerged plasmas, with the aim of increasing the quality of this reinforcing agent in biopolymer composite materials. Both the morphology and surface chemistry of nanocellulose were influenced by the application of a plasma torch and filamentary jet plasma in a liquid suspension of nanocellulose. Depending on the type of plasma source and gas mixture the surface chemistry was modified by the incorporation of oxygen and nitrogen containing functional groups. The treatment conditions which lead to nanocellulose based polymer nanocomposites with superior mechanical properties were identified. This work provides a new eco-friendly method for the surface functionalization of nanocellulose directly in water suspension, thus overcoming the disadvantages of chemical treatments.

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Effect of microwave argon plasma on the glycosidic and hydrogen bonding system of cotton cellulose

Cited by 25 publications

References 12 publications

Melt-processing, moisture-resistance and strength retention properties of supercritical CO2-processed thermoplastic starch resins

Melt-processing, moisture-resistance and strength retention properties of supercritical CO2-processed thermoplastic starch resins

Preventing the collapse of 3D bacterial cellulose network via citric acid

Treatment of Nanocellulose by Submerged Liquid Plasma for Surface Functionalization

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