FTIR spectroscopic studies on the heterogeneous transformation of cellulose I into cellulose II

Fengel, D.; Strobel, Claudia

doi:10.1002/actp.1994.010450406

Cited by 40 publications

(21 citation statements)

References 19 publications

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“…From Fig. 4, it can be seen that all 3 precursor fibres, 100% cellulose ( and 40% lignin: 60% cellulose (4060LC) show characteristic cellulose bands at around 3300, 2900 and 1025 cm -1 attributed to O-H stretching (tO-H), C-H bending (tC-H) and pyranose ring stretching (-C-O-C) (Fan et al 2012;Fengel and Strobel 1994). As the fibres are heated the O-H stretch band decreases likely due to a continuous dehydration process as revealed by the evolved gas analysis.…”

Section: Stabilization Of Cellulose-lignin Composite Fibresmentioning

confidence: 99%

Enhanced stabilization of cellulose-lignin hybrid filaments for carbon fiber production

Byrne

Silva

et al. 2017

Cellulose

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Herein we investigate the stabilization behavior of a cellulose-lignin composite fibre towards application as a new bio derived precursor for carbon fibres. Carbon fibre materials are in high demand as we move towards a lower emission high-efficiency society. However, the most prominent current carbon fibre precursor is an expensive fossil-based polymer. Over the past decade significant research has focused on using renewable and bio derived alternatives. By blending cellulose and lignin and spinning a fibre with a continuous bi-component matrix a new approach to overcome the current limitations of both these precursors is proposed. A thorough study is conducted here on understanding the stabilization of the new precursors which is a critical step in the carbon fibre process. We show that stabilization times of the composite fibre are significantly reduced in comparison to pure lignin and improvements in mass yield compared to pure cellulose fibres are observed.

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Section: Stabilization Of Cellulose-lignin Composite Fibresmentioning

confidence: 99%

Enhanced stabilization of cellulose-lignin hybrid filaments for carbon fiber production

Byrne

Silva

et al. 2017

Cellulose

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“…On the FTIR spectrum of the CF after grafting modification, the bands at 1653 and 1542 cm −1 corresponded to the typical amide I and II stretching vibrations of PNIPAAm chain, respectively, and the bands at 2850, 2973, and 1458 cm −1 corresponded to the stretching vibrations and deformation vibrations, respectively, of the CH bond from methyl groups on the PNIPAAm chain . On the FTIR spectrum of pristine cotton, the weak band at 1635 cm −1 was attributed to absorbed water . This revealed that PNIPAAm was successfully grafted onto the CF with the APS initiator, and we obtained CF‐ g ‐PNIPAAm.…”

Section: Resultsmentioning

confidence: 94%

Cotton‐fabric‐grafted poly(N‐isopropyl acrylamide) initiated by ammonium peroxydisulfate

Jian

2014

J of Applied Polymer Sci

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In this article, we report that thermoresponsive poly(N‐isopropyl acrylamide) (PNIPAAm) was successfully grafted onto a cotton fabric (CF) surface by free‐radical solution grafting polymerization; we obtained a thermoresponsive CF‐grafted PNIPAAm. This reaction system only contained four constituents: the monomer, solvent, initiator, and CFs. Ammonium peroxydisulfate was chosen as the initiator, and water was chosen as the solvent. A series of initiator concentrations and grafting polymerization temperatures were used in the experiments, and their effects on the grafting ratio (G) were also studied. Also, the effects of the G of CF‐g‐PNIPAAm on their corresponding thermoresponses was studied further. The structure of CF‐g‐PNIPAAm was characterized by Fourier transform infrared spectroscopy–attenuated total reflectance analysis and scanning electron microscopy analysis. The G of CF‐g‐PNIPAAm was measured by a gravimetric method. The thermoresponse of CF‐g‐PNIPAAm was characterized by modulated differential scanning calorimetry, water contact angle measurements, and wetting time measurements. The experiments manifested the following results: (1) the initiator concentration and grafting polymerization temperature both influenced G, (2) the grafted PNIPAAm covered the CF surface, (3) the CF‐g‐PNIPAAm showed thermoresponsive hydrophilicity/hydrophobicity, and (4) a relationship existed between the thermoresponse of CF‐g‐PNIPAAm and the corresponding G. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 41193.

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“…The most prominent bands of the lignin spectra could be in the region 1 300–1 000 cm −1 . The absorption band between 1 240 and 1 210 cm −1 allows to probe the asymmetric stretchning vibrations of the COC linkages in ethers and esters or to phenolic hydroxyls . The COC vibrational stretching was observed at 1 160 cm −1 by Schultz and Baranska .…”

Section: Ir Bands Of Ligninmentioning

confidence: 99%

Treatment of Sugarcane Bagasse Lignin Employing Atmospheric Pressure Microplasma Jet in Argon

Amorim

Oliveira

Souza-Corrêa

et al. 2013

Plasma Processes & Polymers

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An atmospheric argon rf microplasma jet was employed to treat lignin samples. The treatment time was carried out from 30 min to 4 h resulting in a strong degradation of the lignin structure. The most important degradation was observed in functional groups having asymmetric in‐phase ring stretching as well as in CC and CO stretching vibrations. Simple calculations may help us explain the OH bond breakings by electron collisions inside the microplasma. In the afterglow condition, it was not observed any change on the lignin spectra.

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FTIR spectroscopic studies on the heterogeneous transformation of cellulose I into cellulose II

Cited by 40 publications

References 19 publications

Enhanced stabilization of cellulose-lignin hybrid filaments for carbon fiber production

Enhanced stabilization of cellulose-lignin hybrid filaments for carbon fiber production

Cotton‐fabric‐grafted poly(N‐isopropyl acrylamide) initiated by ammonium peroxydisulfate

Treatment of Sugarcane Bagasse Lignin Employing Atmospheric Pressure Microplasma Jet in Argon

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