scholarly journals Cellulose Modification for Improved Compatibility with the Polymer Matrix: Mechanical Characterization of the Composite Material

Materials ◽  
2020 ◽  
Vol 13 (23) ◽  
pp. 5519
Author(s):  
Stefan Cichosz ◽  
Anna Masek ◽  
Adam Rylski
Keyword(s):  
Polymer Matrix ◽  
Treatment Method ◽  
Polymer Materials ◽  
Plant Fiber ◽  
Healthcare Applications ◽  
Neat Polymer ◽  
Cellulose Modification ◽  
Chemical Grafting ◽  
Good Biocompatibility ◽  
Improved Performance

The following article is the presentation attempt of cellulose hybrid chemical modification approach as a useful tool in improving the mechanical properties of plant fiber-filled polymer materials. The treatment process is a prolonged method of the cellulose maleinization and consists of two steps: 1. solvent exchange (altering fiber structure); 2. maleic anhydride (MA) chemical grafting (surface modification). Thanks to the incorporated treatment method, the created ethylene–norbornene copolymer composite specimen exhibited an improved performance, tensile strength at the level of (38.8 ± 0.8) MPa and (510 ± 20)% elongation at break, which is higher than for neat polymer matrix and could not be achieved in the case of regular MA treatment. Moreover, both the Payne effect and filler efficiency factor indicate a possibility of the fiber reinforcing nature that is not a common result. Additionally, the polymer matrix employed in this research is widely known for its excellent resistance to aqueous and polar organic media, good biocompatibility, and the ability to reproduce fine structures which makes it an interesting material regarding healthcare applications. Therefore, plant fiber-based polymer materials described in this research might be potentially applied in this area, e.g., medical devices, drug delivery, wearables, pharmaceutical blisters, and trays.

Study of the effect of the reinforcement direction on the identification of relaxation transitions of moisture-saturated carbon fiber VKU-25

2021 ◽  
Vol 87 (9) ◽  
pp. 38-43
Author(s):  
O. G. Ospennikova ◽  
P. S. Marakhovsky ◽  
N. N. Vorobyov ◽  
E. V. Nikolaev ◽  
A. I. Gulyaev ◽  
...  
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Carbon Fiber ◽  
Polymer Matrix ◽  
Structural Parameters ◽  
Polymer Materials ◽  
Thermal Coefficient ◽  
Initial State ◽  
Relaxation Transitions

Thermodilatometric methods of analysis are used to study the structural parameters of polymer materials, however, when studying moisture-saturated compositions certain difficulties arise in their identification. The results of thermophysical tests of VKU-25 carbon fiber samples in the initial state and after moisture saturation are presented. It is shown that heat treatment of materials affects the recorded values of the glass transition temperature of the epoxy matrix. When the samples are exposed in water or above the water surface, the sorbate penetrates into the polymer at the same rate, which is confirmed by almost identical values of water absorption at the same exposure time. The estimates of the thermal coefficient of linear expansion (TCLE) of the samples in the range of 20 - 250°C are given. Moreover, it is shown that the glass transition temperature of the plasticized polymer matrix depends on the direction of fiber reinforcement. In the case of moisture-saturated carbon fiber (CF)heated to 210°C, the formation of main cracks occurs mainly at the fiber-matrix interface. The glass transition temperature (GTT) of the material in the dry state (176 - 177°C), appeared almost independent on the heating rate, whereas for water-saturated samples, GTT changes significantly and can be described by a polynomial of the 2nd order. After exposure of the carbon fiber under conditions of high temperature and humidity, two relaxation transitions corresponding to the systems occur in the polymer matrix: epoxidian oligomer— amine hardener and polyfunctional resin— amine hardener. The glass transition temperature is 132 and 159°C in the first and in the second, respectively. The results obtained can be used in the development of new polymer composite materials.

scholarly journals Influence of nanoparticles on the morphology, thermal stability and air permeability of electrospun polylactic-acid fibres

e-Polymers ◽  
2011 ◽  
Vol 11 (1) ◽  
Author(s):  
Jenny Alongi ◽  
Merima Pošković
Keyword(s):  
Electron Microscopy ◽  
Thermal Stability ◽  
Polylactic Acid ◽  
Polymer Matrix ◽  
Fibre Diameter ◽  
Air Permeability ◽  
Solution Viscosity ◽  
Polymer Molecular Weight ◽  
Neat Polymer ◽  
Lower Permeability

AbstractPolylactic-acid (PLA) and PLA-clay fibres have been produced from solution of 1,1,1,3,3,3-hexafluoro-2-propanol by electrospinning. Nanoclays having different aspect ratio, namely a montmorillonite and a sepiolite, have been added and dispersed within the polymer matrix in order to enhance the thermal stability and air permeability of PLA. The influence of the polymer molecular weight, the solution viscosity and conductivity on the morphology of the fibres has been investigated. Electron microscopy has shown that fibre diameter and the presence of beads defects in the fibres depend on the type of clay added to the polymer matrix. The thermal stability in nitrogen and in air has been drastically enhanced for the presence of the clays as compared with neat polymer. Finally, permeability tests performed on the electrospun condensed fibres pointed out that PLA-clay fibres exhibit a lower permeability to air (up to 90%) with respect to neat PLA fibres.

scholarly journals Magnetic studies of 0.7(Fe2O3)/0.3(ZnO) nanocomposites in nanopowder form and dispersed in polymer matrix

2016 ◽  
Vol 34 (2) ◽  
pp. 286-296 ◽  
Author(s):  
Janusz Typek ◽  
Kamil Wardal ◽  
Grzegorz Zolnierkiewicz ◽  
Anna Szymczyk ◽  
Nikos Guskos ◽  
...  
Keyword(s):  
Polymer Matrix ◽  
Magnetic Behavior ◽  
Magnetic Studies ◽  
Static Magnetization ◽  
Interparticle Interactions ◽  
Neat Polymer ◽  
Two Samples ◽  
Poly Ethylene ◽  
Two Phases ◽  
Average Size

AbstractMagnetic properties of 0.7(Fe2O3)/0.3(ZnO) nanocomposite synthesized by traditional wet chemistry method and containing only two phases: ZnO (nonmagnetic) and ZnFe2O4 (magnetic, with nanocrystallites of average size 12 nm, but forming large agglomerates, up to 100 nm in size) were studied by DC magnetization and ferromagnetic resonance (FMR). The investigated nanocomposite was either in a form of nanopowder or dispersed at concentration of 0.1 wt.% in poly(ethylene naphthalate-block-tetramethylene oxide) PTMO-b-PEN polymer matrix. Similarities and differences in magnetic behavior of these two samples revealed by the study of static magnetization and FMR spectra have been discussed relative to different morphologies and the associated variation of interparticle interactions. Moreover, thermal and thermo-oxidative stability of the nanocomposite and the neat polymer have been studied by thermogravimetric method.

scholarly journals Investigation of Cross-Linked and Additive Containing Polymer Materials for Membranes with Improved Performance in Pervaporation and Gas Separation

Membranes ◽  
2012 ◽  
Vol 2 (4) ◽  
pp. 727-763 ◽  
Author(s):  
Katharina Hunger ◽  
Nadine Schmeling ◽  
Harold B. Tanh Jeazet ◽  
Christoph Janiak ◽  
Claudia Staudt ◽  
...  
Keyword(s):  
Gas Separation ◽  
Polymer Materials ◽  
Improved Performance

scholarly journals Antioxidant Traits of Some Nanocarbon Moieties Integrated in Polymer Materials (a Review)

2016 ◽  
Vol 10 (4s) ◽  
pp. 581-586 ◽  
Author(s):  
Eldar Zeynalov ◽  
◽  
Manfred Wagner ◽  
Joerg Friedrich ◽  
Matanat Magerramova ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Polymer Matrix ◽  
Polymeric Composites ◽  
Polymer Materials ◽  
Thermal And Mechanical Properties ◽  
Fullerene Soot ◽  
The Status

This review briefly gives the status of worldwide researches in the aspect of an impact of incorporated fullerenes and carbon nanotubes (CNTs) on durability of different polymeric composites under stressful harsh therm-oxidative conditions. It has been inferred that among various nanoparticulates, fullerenes and CNTs are preferable to be used for enhancing thermal and mechanical properties of polymers. Fullerenes C60, C70, fullerene soot and CNTs being integrated in polymer matrix effectively prevent both their thermal and thermoxidative degradation, and photooxidation processes as well.

scholarly journals Impact of the Graphite Fillers on the Thermal Processing of Graphite/Poly(lactic acid) Composites

Materials ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5346
Author(s):  
Daniel Kaczor ◽  
Kacper Fiedurek ◽  
Krzysztof Bajer ◽  
Aneta Raszkowska-Kaczor ◽  
Grzegorz Domek ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Polymer Matrix ◽  
Thermal Processing ◽  
Poly Lactic Acid ◽  
Expandable Graphite ◽  
Slight Reduction ◽  
Melt Mixing ◽  
Neat Polymer ◽  
Industrial Grade ◽  
The Impact

To assess the impact of graphite fillers on the thermal processing of graphite/poly(lactic acid) (PLA) composites, a series of the composite samples with different graphite of industrial grade as fillers was prepared by melt mixing. The average size of the graphite grains ranged between 100 µm and 6 µm. For comparative purposes, one of the carbon fillers was expandable graphite. Composites were examined by SEM, FTIR, and Raman spectroscopy. As revealed by thermogravimetric (TG) analyses, graphite filler slightly lowered the temperature of thermal decomposition of the PLA matrix. Differential scanning calorimetry (DSC) tests showed that the room temperature crystallinity of the polymer matrix is strongly affected by the graphite filler. The crystallinity of the composites determined from the second heating cycle reached values close to 50%, while these values are close to zero for the neat polymer. The addition of graphite to PLA caused a slight reduction in the oxidation induction time (OIT). The melt flow rate (MFR) of the graphite/PLA composites was lower than the original PLA due to an increase in flow resistance associated with the high crystallinity of the polymer matrix. Expandable graphite did not cause changes in the structure of the polymer matrix during thermal treatment. The crystallinity of the composite with this filler did not increase after first heating and was close to the neat PLA MFR value, which was extremely high due to the low crystallinity of the PLA matrix and delamination of the filler at elevated temperature.

scholarly journals Photodegradation of UHMWPE Compounded with Annatto and Beetroot Extracts

2016 ◽  
Vol 2016 ◽  
pp. 1-12 ◽  
Author(s):  
Alexandre Rangel de Sousa ◽  
Géssica Patrícia Dornas ◽  
Isadora Cota Carvalho ◽  
Renata Francisca da Silva Santos
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Polymer Matrix ◽  
Spectroscopic Characterization ◽  
Tensile Tests ◽  
Neat Polymer ◽  
Before And After ◽  
The Stability ◽  
The One ◽  
Ultra High Molecular Weight

We observed the anti-UV action of beetroot extract in an ultra-high molecular weight (UHMWPE) matrix. The beetroot extract and the one prepared from annatto seed also acted efficiently as pigment to the same polymeric matrix. Neat UHMWPE and UHMWPE compounded with annatto and beet extract were compression molded and tensile specimens were obtained from the molded plates and submitted to UV radiation for up to 42 days. Tensile tests were performed and it was observed that the beet extract had a stabilizing action in the polymer compared to neat polymer and the one with annatto extract. Complementary analyses showed good homogenization of the extracts through the polymer matrix indicating the possibility of use as pigment, although the annatto extract appeared to be very unstable under irradiation. Spectroscopic characterization helped to explain the stability of the extracts before and after molding.

Improved performance of flexible white hybrid light emitting diodes by adjusting quantum dots distribution in polymer matrix

Vacuum ◽  
2015 ◽  
Vol 111 ◽  
pp. 1-4 ◽  
Author(s):  
Wei Wu ◽  
Fushan Li ◽  
Chen Nie ◽  
Jiaqi Wu ◽  
Wei Chen ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Polymer Matrix ◽  
Light Emitting Diodes ◽  
Light Emitting ◽  
Improved Performance

scholarly journals Environmental Hazards of Giant Reed (Arundo donax L.) in the Macaronesia Region and Its Characterisation as a Potential Source for the Production of Natural Fibre Composites

Polymers ◽  
2021 ◽  
Vol 13 (13) ◽  
pp. 2101
Author(s):  
Luis Suárez ◽  
Jessica Castellano ◽  
Francisco Romero ◽  
María Dolores Marrero ◽  
Antonio Nizardo Benítez ◽  
...  
Keyword(s):  
Composite Materials ◽  
Invasive Plant ◽  
Flexural Modulus ◽  
Polymeric Composite ◽  
Mechanical Tests ◽  
Arundo Donax ◽  
Polymer Materials ◽  
Giant Reed ◽  
Neat Polymer ◽  
Arundo Donax L

This paper summarises the results obtained from the characterisation of giant reed (Arundo donax L.) plant and fibres. The research is part of a project developed in the Macaronesia region, of which the aim is to demonstrate the feasibility of using biomass from invasive plant species in the composites sector as a way of financing control campaigns and habitats conservation labours. An experimental procedure for the extraction of fibre bundles from this plant was developed, and the material obtained was characterised in terms of chemical composition, thermogravimetry and infrared spectra to evaluate its potential application in the production of polymeric composite materials as a strategy for the valorisation of residual biomass from this invasive species in Macaronesia. Thermoplastic matrix composites with fibre content up to 40 wt.% were produced and their mechanical properties under tensile, flexural and impact loading were determined. No references on the preparation of composite materials with polyolefin matrices and giant reed fibres have been found. Results obtained from mechanical tests show a good performance of the manufactured composites, with a significant increase in both flexural and tensile stiffness; the flexural modulus is almost tripled for PE-based composites and rises to 88% with respect to PP matrix. The ultimate flexural strength and the tensile and flexural yield strength are kept at acceptable values compared to neat polymer materials, although ultimate tensile strength and impact resistance are significantly affected when natural fibres are added.

Sign in / Sign up

Export Citation Format

Share Document