Characteristic terahertz absorption spectra of paramylon and paramylon-ester compounds

Investigation of Some Ion Selective and Water Repellent Properties of Carbazole Based Polymers

“…According to this, the changing in absorbance peaks of B2 depending on concentration is linear but that of P(B2) is not linear, firstly it has a rising curve and a descending curve later. Therefore the correlation value (R 2 =0,337259) is far from 1, whereas as calculated 0,997993 the correlation value (R 2 ) of B2 is pretty close to 1 [23] . It is drawn the absorbance changing graphs at maximum wavelengths in UV spectra of B2 and P(B2) to investigate the changing depending on absorbance.…”

Chemically induced strengthening of curdlan alkylcarbamate thermoplastics

“…The FTIR spectra of CrdCE with reference to those of CrdC(Hex), CrdE(Hex), and curdlan are shown in Figure 1. The spectra show peaks ascribed to stretching vibrations of the curdlan skeleton at 1155 (C1OC3), 1074 (CO), and 1036 cm −1 (C1OC5), 16,17 those corresponding to the deformation of the β‐linked glycosidic bonds at 887 cm −1 (C1H), and those due to the deformation vibrations of the pyranose ring in the lower frequency region than 1000 cm −1 18 . The peak arising from the OH stretching vibrational broad absorption of curdlan at 3400 cm −1 slightly disappeared at a higher frequency region of 4000–2500 cm −1 , and a weak‐broad absorption was observed in the frequency range of 3310–3330 cm −1 after carbamation and carboxyesterification.…”

A review of paramylon processing routes from microalga biomass to non-derivatized and chemically modified products

“…Paramylon granules can then be recovered by centrifugation, before being dried (Clarke & Stone, 1960) or freeze-dried (Kobayashi et al, 2010). This extraction process can be applied to fresh E. gracilis biomass (Zhong et al, 2021) or previously lyophilized biomass (Tanaka et al, 2017). However, there is no standard method.…”

“…More recently, the same heterogeneous reaction of acyl chlorides with paramylon was performed in N-methylpyrrolidone/pyridine mixtures (Zhong et al, 2021). DS values from 1.7 to 2.7 were obtained by varying the acyl chloride/paramylon ratio.…”

“…DS values from 1.7 to 2.7 were obtained by varying the acyl chloride/paramylon ratio. The authors demonstrated that the DS value can be easily characterized on particles of the paramylon derivatives by terahertz spectroscopy, using specific signature peaks of paramylon which are shifted upon modification (Zhong et al, 2021). this section allow a much wider variety of processing routes: their solvent based processing into films and nanofibers can be done either in water or in organic solvents, thanks to modified solubility, while solvent free thermomechanical processing can become possible thanks to their thermoplasticity without thermal degradation:…”