The effect of extrusion conditions for a screw-disk plasticizing system on the mechanical properties of wood-polymer composites (WPC)

Michalska-Pożoga, I.; Rydzkowski, Tomasz

doi:10.14314/polimery.2016.202

Cited by 8 publications

(9 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Composites with raw wood and wood treated with propolis extract exhibited very low values of strain and relatively low impact strength. Such results are typical for composites of thermoplastic polymers with lignocellulosic fillers described in literature [67][68][69][70], which are characterised by poor adhesion. However, in the case of composites treated by propolis-silane preparations very high values of elongation at break and high impact strength were recorded, which was particularly evident for the PP + EPP-TEOS/OTEOS system.…”

Section: Mechanical Properties Of Wpcsupporting

confidence: 65%

Propolis and Organosilanes as Innovative Hybrid Modifiers in Wood-Based Polymer Composites

et al. 2021

View full text Add to dashboard Cite

The article presents characteristics of wood/polypropylene composites, where the wood was treated with propolis extract (EEP) and innovative propolis-silane formulations. Special interest in propolis for wood impregnation is due to its antimicrobial properties. One propolis-silane formulation (EEP-TEOS/VTMOS) consisted of EEP, tetraethyl orthosilicate (TEOS), and vinyltrimethoxysilane (VTMOS), while the other (EEP-TEOS/OTEOS) contained EEP, tetraethyl orthosilicate (TEOS), and octyltriethoxysilane (OTEOS). The treated wood fillers were characterized by Fourier transform infrared spectroscopy (FTIR), atomic absorption spectrometry (AAS), and X-ray diffraction (XRD), while the composites were investigated using differential scanning calorimetry (DSC), X-ray diffraction (XRD), and optical microscopy. The wood treated with EEP and propolis-silane formulations showed resistance against moulds, including Aspergillus niger, Chaetomium globosum, and Trichoderma viride. The chemical analyses confirmed presence of silanes and constituents of propolis in wood structure. In addition, treatment of wood with the propolis-silane formulations produced significant changes in nucleating abilities of wood in the polypropylene matrix, which was confirmed by an increase in crystallization temperature and crystal conversion, as well as a decrease in half-time of crystallization parameters compared to the untreated polymer matrix. In all the composites, the formation of a transcrystalline layer was observed, with the greatest rate recorded for the composite with the filler treated with EEP-TEOS/OTEOS. Moreover, impregnation of wood with propolis-silane formulations resulted in a considerable improvement of strength properties in the produced composites. A dependence was found between changes in the polymorphic structures of the polypropylene matrix and strength properties of composite materials. It needs to be stressed that to date literature sources have not reported on treatment of wood fillers using bifunctional modifiers providing a simultaneous effect of compatibility in the polymer-filler system or any protective effect against fungi.

show abstract

Section: Mechanical Properties Of Wpcsupporting

confidence: 65%

Propolis and Organosilanes as Innovative Hybrid Modifiers in Wood-Based Polymer Composites

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Very interesting results were obtained in the study of impact strength and elongation at break. All tested systems were characterized by lower values of these parameters in comparison to the matrix, which is a characteristic feature of the produced polymeric composite materials (Nuñez et al 2003;Ndiaye et al 2012;Michalska-Pozoga and Rydzkowski 2016). However, modification of the filler with the imidazolium ionic liquid with a shorter alkyl substituent resulted in a considerable variation.…”

Section: Mechanical Testingmentioning

confidence: 95%

Innovative ionic liquids as functional agent for wood-polymer composites

2021

View full text Add to dashboard Cite

Chemical modification of lignocellulosic fillers is a hydrophobization process that has been used for years in the production of wood-polymer composites (WPCs). However, finding new, more effective modifiers is still a big challenge and remains the subject of much research. This study involved the chemical modification of wood with the use of newly designed ammonium and imidazolium ionic liquids containing reactive functional groups. The effectiveness of the modification was confirmed using FTIR and XRD techniques. The effect of modification of wood on the supermolecular structure and morphology of wood-polymer composites was investigated by X-ray diffraction, hot stage optical microscopy and differential scanning calorimetry. A significant influence of the modifier structure on the shaping of polymorphic varieties of the polymer matrix was demonstrated. The chemical modification also had significant effect on the nucleating properties of the wood fillers, which was confirmed by the determined crystallization parameters (crystallization half-time, crystallization temperature, crystal conversion). Moreover, the formation of a transcrystalline PP layer was noticed, which showed a large variation depending on the structure of the used ionic liquid. The obtained results correlated very well with the results of mechanical tests. It has been shown that it is possible to precisely design an ionic liquid containing a reactive functional group capable of interacting with hydroxyl groups of cellulose molecules. Moreover, the possibility of functionalizing the lignocellulosic material with innovative ionic liquids without the need to use organic solvents has not been demonstrated so far. Graphic abstract

show abstract

“…Composite plates were obtained in the extrusion process using a worm-disk plasticizing system with the technology presented in previous publications [18,19]. The temperature of the hot zone was a constant parameter t = 160 • C. At the same time, the rotational speed of the screw (and the disc) n and the width of the disc chink W s were the variable factors (Table 2).…”

Section: Obtaining Composite Wpcsmentioning

confidence: 99%

Analysis of Particles’ Size and Degree of Distribution of a Wooden Filler in Wood–Polymer Composites

Michalska-Pożoga

Szczepanek

2021

Materials

View full text Add to dashboard Cite

In wood–polymer composites (WPCs), regardless of the origin of the filler and its dimensions, their significant role in changing the properties of the WPCs’ material was found. Given the above, it is of particular importance to determine the size of the wood filler particles after their production. In addition, it is also important to determine the degree of distribution of the filler in the polymer matrix. The methodology for determining particle size and distribution is complex, even when using image analysis computer systems. This article presents the application and implementation of the multi-stage procedure for determining the size of wood particles and the degree of their distribution in the WPCs by means of image analysis using a numerical calculation program. The procedure, co-authored by the researchers at the Koszalin University of Technology and School of Mechanical and Materials Engineering, is published in the Industrial Crops and Products 2016 Comparing the results obtained for the PP/Lignocel 3-4 and PP/Lignocel C120 composites produced under highly different conditions in the target zone, it was found that the degree of the component distribution in the polymer matrix was significantly influenced by the width of the target gap. In both cases, the best homogeneity of the material and a good distribution of the filler in the polymer matrix was achieved within the parameters that have a mild effect on the material and allow it to stay longer in the plasticizing system, i.e., Ws = 1.0–3.0 mm with simultaneous impact medium to high speed in the range n = 26–40 rpm.

show abstract

The effect of extrusion conditions for a screw-disk plasticizing system on the mechanical properties of wood-polymer composites (WPC)

Cited by 8 publications

References 0 publications

Propolis and Organosilanes as Innovative Hybrid Modifiers in Wood-Based Polymer Composites

Propolis and Organosilanes as Innovative Hybrid Modifiers in Wood-Based Polymer Composites

Innovative ionic liquids as functional agent for wood-polymer composites

Analysis of Particles’ Size and Degree of Distribution of a Wooden Filler in Wood–Polymer Composites

Contact Info

Product

Resources

About