Effect of silicone interphase on the mechanical properties of flax-polyurethane composites

Gassan, Jochen; Dietz, Thorsten; Błędzki, Andrzej K.

doi:10.1163/156855400300184262

Cited by 17 publications

(5 citation statements)

References 23 publications

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“…It may be that the interactions between the PLA and the fibres were too strong to give a good balance between the different mechanical properties, cf. also 27, 28…”

Section: Discussionmentioning

confidence: 96%

Processing and properties of mineral‐interfaced cellulose fibre composites

Thunwall

Boldizar

Rigdahl

et al. 2007

J of Applied Polymer Sci

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Polypropylene (PP) or, in some cases, poly (lactic acid) (PLA) were compounded with cellulosic fibres. The amount of fibres used was in the range 10-30 vol % and, in case of PP, a series of compounds was prepared with a minor amount of maleated PP as a compatibiliser. This matrix was denoted MAPP. Before compounding the polymers and the fibres, undelaminated bentonite (industrial scale) or delaminated clay (nanoclay) was deposited on the fibres in different amounts to improve the dispersion of the fibres in the polymer matrix, i. e., to avoid detrimental fibre bundles. The PP-based compounds were either extruded or injection moulded, whereas the PLA-compounds were only injection moulded. The mechanical properties were primarily evaluated for the injection moulded specimens. In general, the fibres had a strong effect on the mechanical behaviour of the materials, especially in the case of PLA and MAPP. Treating the fibres with undelaminated clay or nanoclay improved to some extent the dispersion of the fibres and the mechanical performance of the composites, but further optimization of the function of the mineral in this respect is probably required. The combination of the mineral treatment with a debonding agent appeared to be an interesting route here. With such a combination, a visually very good dispersion of the fibres in the PP-based matrix could be obtained, partly at the expense of the mechanical performance. The compounding of the cellulosic fibres with PP led in this case to a marked decrease in the fibre length.

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“…It may be that the interactions between the PLA and the fibres were too strong to give a good balance between the different mechanical properties, cf. also 27, 28…”

Section: Discussionmentioning

confidence: 96%

Processing and properties of mineral‐interfaced cellulose fibre composites

Thunwall

Boldizar

Rigdahl

et al. 2007

J of Applied Polymer Sci

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“…During this research, the interface between fibre and matrix was not under investigation and was thus not altered. However, it is well known that the use of compatibilising agents increases the mechanical properties such materials [30,31]. As described in these references, the fibre treat ment procedures are not easy to perform, and are quite time consuming.…”

Section: Perspectivesmentioning

confidence: 99%

Processability of Biobased Thermoset Resins and Flax Fibres Reinforcements Using Vacuum Assisted Resin Transfer Moulding

Schuster¹,

Govignon²,

Bickerton³

2014

OJCM

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Biocomposite panels consisting of biobased thermoset resins (EP, PU, UP, and tannin) and flax fibre reinforcements were produced using the vacuum assisted resin transfer moulding process. Panels based on a conventional chemical-based resin matrix were also produced, and investigated comparatively. Rheometric analyses were performed to evaluate the suitability of these resins for liquid composite moulding. Tensile, shear, and impactbending tests have been carried out to assess the quality and mechanical performance of manufactured laminates. The impregnation quality was assessed by means of ultrasonic-C-scanning and microscopy. It turned out that the properties of the biobased composite panels made of biobased epoxy resin and a biobased UP-resin from the company Nuplex in New Zealand were onlay slightly inferior to those produced with a conventional epoxy resin. A biobased PU-resin from the company USSC in the USA developed voids during curing. A tannin-based resin containing of formaldehyde was not processable.

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“…Wie von GFK her bekannt und bereits bei Flachs-EP-Verbunden gezeigt 10) , müssen die Applikationsbedingungen, im Falle des Additiv-Verfahrens also die Konzentration, so gewählt werden, daß sich (theoretisch) nur eine (bei einigen Systemen auch 1 -3fache) monomolekulare Schicht ausbilden kann. Dies bedeutet, daß sich bei zu geringen Konzentrationen nur partiell eine FaserMatrix-Haftung ausbildet.…”

Section: Festigkeitssteigernde (Strong') Interphaseunclassified

Möglichkeiten zur Kontrolle der Festigkeit und Impactzähigkeit in naturfaserverstärkten Kunststoffen

Gassan

Błędzki²

1999

Angew. Makromol. Chem.

Self Cite

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Die mechanischen Eigenschaften faserverstärkter Kunststoffe werden u. a. wesentlich durch die Grenzfläche/Grenzschicht zwischen Faser und Matrix bestimmt. Vor diesem Hintergrund beschreibt und diskutiert dieser Beitrag wie durch eine gezielte Haftvermittlerapplikation sowie durch den Einsatz einer energieabsorbierenden Grenzschicht die Festigkeit und Zähigkeit naturfaserverstärkter Polyurethane kontrolliert werden kann. Maximale Festigkeitssteigerungen von bis 35% konnten durch den Silanhaftvermittler erzielt werden, die Verbundschlagzähigkeit konnte hingegen durch die energieabsorbierende Grenzschicht um bis zu 100% gesteigert werden. Weiterhin wurde eine lineare Abnahme der Verbundbiegefestigkeit mit zunehmender Verbundschlagzähigkeit ermittelt. REM‐Untersuchungen an Bruchflächen zeigten, daß der Einsatz des Haftvermittlers vermehrt zu kohäsiven Schädigungen der Faseroberfläche führt, hingegen die Verbunde mit energieabsorbierender Grenzschicht deutliche plastische Deformationen dieser Schicht aufweisen.

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Effect of silicone interphase on the mechanical properties of flax-polyurethane composites

Cited by 17 publications

References 23 publications

Processing and properties of mineral‐interfaced cellulose fibre composites

Processing and properties of mineral‐interfaced cellulose fibre composites

Processability of Biobased Thermoset Resins and Flax Fibres Reinforcements Using Vacuum Assisted Resin Transfer Moulding

Möglichkeiten zur Kontrolle der Festigkeit und Impactzähigkeit in naturfaserverstärkten Kunststoffen

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