Polysiloxane‐lignin composites

Stiubianu, George; Cazacu, Maria; Cristea, Mariana; Vlad, Angelica

doi:10.1002/app.30240

Cited by 33 publications

(22 citation statements)

References 15 publications

(35 reference statements)

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“…Its competitiveness with respect to other advanced hybrid materials results from the wide range of favorable characteristics of this hybrid system. Lignin, as a commonly occurring and natural substance, in combination with silica with its good mechanical and thermal resistance, produces a hybrid that serves as an excellent filler of polymer sheets, enabling a product with desired properties to be obtained, as has already been confirmed in preliminary studies .…”

Section: Introductionmentioning

confidence: 77%

“…The large amount of research carried out in recent years indicates a significant growth in interest in combining silica with organic polymers of natural origin, including lignin, to obtain an innovative hybrid material [29][30][31][32][33][34][35][36][37]. Its competitiveness with respect to other advanced hybrid materials results from the wide range of favorable characteristics of this hybrid system.…”

Section: Introductionmentioning

confidence: 99%

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A novel functional silica/lignin hybrid material as a potential bio-based polypropylene filler

2014

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A functional silica/lignin hybrid filler was obtained using a process of mechanical grinding of precursors (Syloid®244 silica and kraft lignin). The product underwent comprehensive physicochemical and dispersive–morphological analysis. The silica/lignin hybrid has good homogeneity and a surface area of 164 m2/g. The effectiveness of combination was confirmed by Fourier transform infrared spectroscopy and elemental analysis. The high electrokinetic stability (over almost the whole of the analyzed pH range) and above all the thermal stability of the resulting material (mass loss equal to 12%) indicate its potential use as a polypropylene (PP) filler. Experiments showed that the incorporation of a small amount of silica/lignin hybrid filler into PP may substantially influence its elongation at break and notched impact strength. Especially at low concentrations of silica/lignin filler (below 5 wt%) an exceptional set of mechanical properties was obtained. The addition of larger amounts of the filler was found not to bring any further improvement. POLYM. COMPOS., 36:913–922, 2015. © 2014 Society of Plastics Engineers

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Section: Introductionmentioning

confidence: 77%

Section: Introductionmentioning

confidence: 99%

A novel functional silica/lignin hybrid material as a potential bio-based polypropylene filler

2014

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“…[39][40][41][42] The techniques allow the processing to be performed at a flexible scale without the need for solvents. 46 However, in these cases lignin was used simply as a non-reinforcing filler with no effort to establish a favorable interfacial interaction between lignin and the silicone matrix. Lignin has also been extruded together with silicone and silica.…”

Section: Introductionmentioning

confidence: 99%

Foamed lignin–silicone bio-composites by extrusion and then compression molding

2015

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The use of lignin, one of the most abundant natural products, has not gained wide use as a feedstock due to the difficulty of processing it. We have developed a simple route to produce lignin-silicone composite foams via first extrusion and then compression molding. The formulation consists of raw lignin particles, suitable mixtures of hydrosilanes, and a catalyst B(C 6 F 5 ) 3 . In order to balance the reaction rates between extrusion and molding, as well as to find other optimized conditions for producing foamed structures, a series of optimizations established that a uniform, closed cell lignin-silicone foam was most effectively made by extrusion at room temperature followed by molding at elevated temperatures under pressure for up to 5 minutes. The morphology and uniformity of the foamed structure depended on many factors, including the quantity of lignin, the catalyst, the crosslinking silicone PHMS, the molecular weight of the spacer silicone H-PDMS-H, and the molding temperature. The content of lignin, acting as both a reinforcing filler and a crosslinker (chemically bonded to the siloxane network), could be varied over a wide range from 25 to 55%. The mechanical performance of the lignin-silicone foam was characterized using DMA and tensile tests (tensile strength up to 0.42 MPa, break-at-elongation up to 249%). The strength of the foam was improved by post-curing at 140°C. Although the lignin-silicone foam loses some elasticity after post-curing, it maintains reasonable stability even after heating to 300°C for 12 h. This processing method for lignin-based bio-composites provides new opportunities for better utilization of lignin in silicones and more broadly in organic materials.

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“…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. mechanical properties), it even induces a slight improvement of these, leading to the conclusion that lignin can be used as an extender for silicones, with positives effects mainly on the material's cost 8 .…”

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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Polysiloxane‐lignin composites

Cited by 33 publications

References 15 publications

A novel functional silica/lignin hybrid material as a potential bio-based polypropylene filler

A novel functional silica/lignin hybrid material as a potential bio-based polypropylene filler

Foamed lignin–silicone bio-composites by extrusion and then compression molding

Structure and Thermal Properties of Maleated Lignin-Recycled Polystyrene Composites

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