Properties and structure of PVP–lignin “blend films”

Liu, Changhua; Xiao, Changfa; Liang, Hui

doi:10.1002/app.21367

Cited by 60 publications

(41 citation statements)

References 34 publications

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“…This amorphous nature results in greater ionic diffusivity with a high ionic conductivity which can be obtained in amorphous polymer that have flexible back bone 28 . The low intensity broad peaks observed around 25 o and 41 o which are attributed to the amorphous nature of PVC [29][30][31] . The sample with 1 mol% Mn 2+ , the intensity of the peak observed at 12 o has been increased, which may be due to increased crystallanity.…”

Section: X-ray Diffraction Analysismentioning

confidence: 98%

Structural, Thermal and Optical Properties of Pure and Mn2+ Doped Poly(Vinyl Chloride) Films

et al. 2016

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Pure and Mn2+ doped poly(vinyl chloride) (PVC) polymer films were prepared using the solution cast technique. The prepared samples have been characterized by X-ray diffraction (XRD), UV-Vis Spectroscopy (UV-Vis), Fourier transform infrared (FTIR) Spectroscopy, Thermogravimetric analysis (TGA), Differential Scanning Calorimetry (DSC), Electron Paramagnetic Resonance (EPR) and Scanning Electron Microscopy (SEM) studies. TGA/DSC analysis reveals that the sample is thermally stable upto 350 0C. The morphology of the polymer films was studied by SEM. The optical absorbance of the polymer films was measured in the 200-900 nm wavelength range. The absorption edge, direct band gap and indirect band gap have been evaluated. The FTIR spectrum exhibits several bands characteristics of stretching and bending vibrations of C -Cl, C -H, C = C and O -H groups. The EPR Spectra at room temperature were used to calculate the number of spins and paramagnetic susceptibility as a function of dopant concentration. All the Mn 2+ doped PVC samples exhibit a signal centred at g eff = 1.9. The observed variation in the EPR signal intensity is due to the variation in the dopant concentration. The complexation of Mn 2+ ion with the polymer was confirmed by XRD studies.

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Section: X-ray Diffraction Analysismentioning

confidence: 98%

Structural, Thermal and Optical Properties of Pure and Mn2+ Doped Poly(Vinyl Chloride) Films

et al. 2016

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“…The maleation reaction increases the dispersion process of lignin in the polymeric matrix of rPS. The immiscibility of unmodified lignin in other polymers shifts the T g to higher values 7 .…”

Section: Thermal Propertiesmentioning

confidence: 99%

“…The thermostability of these blends decreased with the increase of lignin content. Initially, an appreciable increase in the measured tensile strength was achieved with a lignin content of 15 %, at which the maximum value of tensile strength was reached but, the strain behaviour of these blend films was deteriorated 7 .In other study, commercial lignin (Protobind 100SA-140) was used as filler with and without silica , on polysiloxane as polymeric matrix. The results of the thermomechanical, physical, and thermal investigations have evidenced the fact that lignin inserted in a silicon matrix does not alter its properties, and in some cases (e.g.…”

Section: Introductionmentioning

confidence: 99%

Structure and Thermal Properties of Maleated Lignin-Recycled Polystyrene Composites

Lisperguer¹,

Núñez²,

Pérez-Guerrero³

2013

J. Chil. Chem. Soc.

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In this work, the changes caused by a chemical modification of the properties and chemical structures of lignin are studied. Lignin from a mixture of Eucalyptus globulus and Eucalyptus nitens obtained through the kraft pulping process was used. The lignin was isolated by acid precipitation and modified by a reaction with maleic anhydride. Maleated lignin (ML) was incorporated to recycled polystyrene (rPS) at 2, 5, and 10 wt-% by a melt-blending process. Fourier transformed infrared spectroscopy (FT-IR) was used to determine the ML structure, and the morphology of rPS/ ML composites was studied by scanning electron microscopy (SEM).Differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) were used to study the glass-transition temperature (T g ) and the thermal stability of rPS and rPS/ ML composites and were compared with virgin PS. The T g values of rPS and their composites were higher than those of the virgin PS. TGA revealed that the thermal stability of rPS with 2 and 5% of ML was slightly greater than that of the virgin PS. These results suggest that postconsumer PS can be used to obtain composite materials with good thermal properties.

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“…The highest average value (103.5 °C) was obtained with 5% acetylated lignin (rPS/NA5), which suggest a higher lignin dispersion in the polymeric matrix in these composites. According to some authors (Liu et al 2005), immiscible blends of unmodified lignin with other polymers cause a shift of Tg to higher values.…”

Section: Dsc Analysismentioning

confidence: 96%

“…Sailaja and Deepthi (2010) modified lignin with phthalic anhydride using pyridine as a catalyst and, through mixing with lowdensity polyethylene and maleic anhydride as compatibilizer, obtained a composite in which relative Young modulus increased from 1 MPa without lignin to 2.5 MPa with 25% lignin. Liu et al (2005) incorporated bamboo alkaline lignin in poly (4-vinyl pyridine) films at 0, 4, 8, 10, 15, and 20% through melt mixing. The glass-transition temperature (Tg) of the blends was found to increase with the addition of lignin from 70 ºC (0%) to 147 ºC (20%) due to the formation of miscible phases, while thermal stability decreased from 354 ºC to 316 ºC.…”

Section: Introductionmentioning

confidence: 99%

Effect of Modified Eucalyptus nitens Lignin on the Morphology and Thermo-mechanical Properties of Recycled Polystyrene

Pérez-Guerrero¹,

Lisperguer²,

Navarrete³

et al. 2014

BioResources

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The morphology and thermo-mechanical properties of recycled polystyrene-based materials (rPS) reinforced with 5 and 15% lignin from kraft pulping of Eucalyptus nitens were studied. The lignin was modified through two esterification processes using either acetic or maleic anhydride, and changes in the structure of the esterified lignin functional groups were analyzed by Fourier transform infrared spectroscopy. The lignin was then incorporated into rPS by melt mixing. Torque variation in the process was evaluated, and the values were compared to those of neat rPS and virgin PS. The results show a plasticizing effect of lignin with a reduction in the torque values. The morphology, studied through scanning electron microscopy, shows a particle size reduction of acetylated and maleated lignin and a more homogeneous dispersion at 5%. The thermal behavior of the composites, studied through differential scanning calorimetry, does not show significant changes in the glasstransition temperature of rPS with the presence of lignin. The dynamic mechanical analysis shows an increasing storage modulus with increasing lignin content. Thermal stability, studied through thermogravimetric analysis, improved for composites containing 5% esterified lignin. The flexural modulus also increased with lignin addition. These results suggest that the thermal and mechanical properties of post-consumer recycled polystyrene can be significantly improved with only 5% esterified lignin.

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Properties and structure of PVP–lignin “blend films”

Cited by 60 publications

References 34 publications

Structural, Thermal and Optical Properties of Pure and Mn2+ Doped Poly(Vinyl Chloride) Films

Structural, Thermal and Optical Properties of Pure and Mn2+ Doped Poly(Vinyl Chloride) Films

Structure and Thermal Properties of Maleated Lignin-Recycled Polystyrene Composites

Effect of Modified Eucalyptus nitens Lignin on the Morphology and Thermo-mechanical Properties of Recycled Polystyrene

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