Author Correction: Synthesis and characterization of polyethylene glycol-phenol-formaldehyde based polyurethane composite.

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Synthesis and characterization of polyethylene glycol-phenol-formaldehyde based polyurethane composite.

A series of phenol-formaldehyde-polyethylene glycol polyether polyols (PF-PEGs) were synthesized through the condensation polymerization and etherification of phenol, formaldehyde, and poly(ethylene glycol) (PEG) under alkaline conditions and subsequently reacted with 1,6-hexamethylene diisocyanate to obtain polyurethane (PU) films using acetone as solvents. The influence of phenol and formaldehyde to PEG mass ratio ((P + F)/PEG) on the hydroxyl number of PF-PEGs and mechanical properties, thermal stabilities, crystallization behaviors, as well as microstructure of polyurethane composite films were studied using chemical analysis, mechanical tests, thermogravimetric analyses (TGA), dynamic mechanical analyses (DMA), X-ray diffraction (XRD), scanning and transmission electron microscopies (SEM and TEM), respectively. Results demonstrated that PF-PEGs with (P + F)/PEG of 50/50 had the highest hydroxyl number of 323 mg K(OH)/g.

[Synthesis and characterization of dihydroeugenol acrylate].

Dihydroeugenol acrylate was synthesized by the reaction of acryloyl chloride (AC) with lignin mode compound dihydroeugenol (DH) in the presence of TEA and characterized by using FTIR, GC/MS, 1H-NMR and GPC. FTIR spectra showed that, after the esterification with acryloyl chloride, the intensity of stretching vibration peak of O-H (centered at 3 495 cm(-1)) of DH was disappeared. At the same time, a new peak appeared at 1 762 cm(-1) which was assigned to ester group.

[Chemical structure of bioethanol lignin by low-temperature alkaline catalytic hydrothermal treatment].

In order to improve the reaction activity of bioethanol lignin, we investigated the activation of bioethanol lignin by a hydrothermal treatment method. Catalytic hydrothermal treatment of bioethanol lignin was performed at 180 degrees C for 3 h in the presence of alkaline solutions (NaOH, Na2 CO3, KOH and K2 CO3), the change in bioethanol lignin structures was studied comparatively by FTIR, 1H NMR,GPC and elemental analysis. FTIR spectra showed that after alkali hydrothermal treatment, the band at 1 375 cm(-1) attributed to the phenolic hydroxyl groups increased, and the band intensity at 1 116 cm(-1) attributed to the ether bond decreased.

[Renewable resource-based composites of thermoplastic acorn starch and polycaprolactone: preparation and FTIR spectrum analysis].

Acorn starch was used as the main material. Thermoplastic acorn starch (TPAS) and binary composites of thermoplastic acorn starch(TPAS)/Polycaprolactone (PCL) were prepared by hot-melt extrusion method. The effects of different plasticizers such as ethylene glycol, glycerol, monoethanolamine, iminobisetnanol and triethanolamine on molecular structure of samples were studied by FTIR and XRD analysis.