Rheological behavior of short Alfa fibers reinforced Mater-Bi® biocomposites

Borchani, Karama Elfehri; Carrot, Christian; Jaziri, Mohamed

doi:10.1016/j.polymertesting.2019.05.011

Cited by 17 publications

(6 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The corresponding increase in the loss modulus is much lower for both composites, in particular at low frequencies, as visible in Figure 3 C,D. More in detail, at low frequency, the value of the storage modulus of PBAT/as-MCC 20% composite, becomes almost frequency-independent, thus indicating a transition of the viscoelastic behavior of the melted system to a solid-like behavior [ 34 ]. It is known from the scientific literature that interconnected structures of anisometric fillers in polymeric melts result in an apparent yield stress which is visible in dynamic measurements by a plateau at low frequencies of the storage modulus versus frequency curves [ 35 , 36 ].…”

Section: Resultsmentioning

confidence: 99%

PBAT Based Composites Reinforced with Microcrystalline Cellulose Obtained from Softwood Almond Shells

et al. 2021

View full text Add to dashboard Cite

This study explores the processability, mechanical, and thermal properties of biocompostable composites based on poly (butylene adipate-co-terephthalate) (PBAT) as polymer matrix and microcrystalline cellulose (MCC) derived from softwood almond (Prunus dulcis) shells (as-MCC) as filler at two different weight concentration, i.e., 10 wt% and 20 wt%. The materials were processed by melt mixing and a commercial MCC (c-MCC) was used as filler comparison. The fibrillar shape of as-MCC particles was found to change the rheological behavior of PBAT, particularly at the highest concentration. The melt mixing processing allowed obtaining a uniform dispersion of both kinds of fillers, slightly reducing the L/D ratio of as-MCC fibers. The as-MCC particles led to a higher increase of the elastic modulus of PBAT if compared to the c-MCC counterparts. Both the MCC fillers caused a drastic reduction of the elongation at break, although it was higher than 120% also at the highest filler concentrations. DSC analysis revealed that both MCC fillers poorly affected the matrix crystallinity, although as-MCC induced a slight PBAT crystallinity increase from 8.8% up to 10.9% for PBAT/as-MCC 20%. Therefore, this work demonstrates the great potential of MCC particles derived from almond shells as filler for biocompostable composites fabrication.

show abstract

Section: Resultsmentioning

confidence: 99%

PBAT Based Composites Reinforced with Microcrystalline Cellulose Obtained from Softwood Almond Shells

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Figure 7 shows the complex viscosity curves for unmodified Mater-Bi and composites containing organic fillers subjected to thermomechanical and chemical treatment using isophorone diisocyanate. The shape of the curves showing no low values of angular frequency Newtonian plateau is typical for starch-based thermoplastics [ 77 ]. While in the case of composite materials, there is no Newtonian behavior that may be related to solid-like rheological behavior resulting from the formation of rigid physical structures in polymeric bulk.…”

Section: Resultsmentioning

confidence: 99%

“…While in the case of composite materials, there is no Newtonian behavior that may be related to solid-like rheological behavior resulting from the formation of rigid physical structures in polymeric bulk. Similarly, the unmodified Mater-Bi also showed independent storage modulus behavior ( Figure S1—Supporting information ); however, the origin of this phenomenon for pure Mater-Bi is the poor miscibility of the polymer system related to dispersion of non-plasticized starch in the polyester matrix [ 77 , 78 , 79 ]. At the same time, all tested material samples showed shear thinning behavior.…”

Section: Resultsmentioning

confidence: 99%

Mater-Bi/Brewers’ Spent Grain Biocomposites—Novel Approach to Plant-Based Waste Filler Treatment by Highly Efficient Thermomechanical and Chemical Methods

et al. 2022

View full text Add to dashboard Cite

Thermoplastic starch (TPS) is a homogenous material prepared from native starch and water or other plasticizers subjected to mixing at a temperature exceeding starch gelatinization temperature. It shows major drawbacks like high moisture sensitivity, poor mechanical properties, and thermal stability. To overcome these drawbacks without significant cost increase, TPS could be blended with bio-based or biodegradable polymers and filled with plant-based fillers, beneficially waste-based, like brewers’ spent grain (BSG), the main brewing by-product. Filler modifications are often required to enhance the compatibility of such composites. Herein, we investigated the impact of BSG thermomechanical and chemical treatments on the structure, physical, thermal, and rheological performance of Mater-Bi-based composites. Thermomechanical modifications enhanced matrix thermal stability under oxidative conditions delaying degradation onset by 33 °C. Moreover, BSG enhanced the crystallization of the polybutylene adipate terephthalate (PBAT) fraction of Mater-Bi, potentially improving mechanical properties and shortening processing time. BSG chemical treatment with isophorone diisocyanate improved the processing properties of the composites, expressed by a 33% rise in melt flow index. Depending on the waste filler’s selected treatment, processing, and rheological performance, thermal stability or interfacial adhesion of composites could be enhanced. Moreover, the appearance of the final materials could be adjusted by filler selection.

show abstract

“…Therefore, the rheology study of the biocomposites formulations is of great importance in terms of processing conditions needed as well as its potential scaleup. Besides, the rheological responses are closely related to the fillers dispersion and orientation, as well as their interactions with the polymer matrix Borchani et al 2019). In general, rheological rotational studies show an increase in the viscosity of green biocomposites under melt flow conditions, indicating an overall hindrance of its processability (Scaffaro et al 2018;Xiao et al 2019).…”

Section: Processingmentioning

confidence: 99%

“…Moreover, Scaffaro et al (2018) and Xiao et al (2019) observed a more marked shearthinning effect (decrease in apparent viscosity at higher oscillatory frequencies) on biocomposites with higher fillers loads (>20%) that indicate a greater interaction among particles, which is disrupted at higher frequencies by disentanglement and reorientation of the fillers and the polymer chains in the flow direction. Another interesting study carried out by Borchani et al (2019) showed the impact of different alkali fibres treatments on Mater-Bi® based biocomposites on the rheological behaviour of the molten mixture, exhibiting a greater gel network strength of treated fibres biocomposites due to the greater interaction between the matrix and the treated filler.…”

Section: Processingmentioning

confidence: 99%

Towards Sustainable Buildings with Free-Form Geometries: Development and Application of Flexible NFRP in Load-Bearing Structures

Dahy

2021

Biocomposite Materials

View full text Add to dashboard Cite

of the material is concerned, specifically the rights of translation, reprinting, reuse of illustrations, recitation, broadcasting, reproduction on microfilms or in any other physical way, and transmission or information storage and retrieval, electronic adaptation, computer software, or by similar or dissimilar methodology now known or hereafter developed. The use of general descriptive names, registered names, trademarks, service marks, etc. in this publication does not imply, even in the absence of a specific statement, that such names are exempt from the relevant protective laws and regulations and therefore free for general use. The publisher, the authors and the editors are safe to assume that the advice and information in this book are believed to be true and accurate at the date of publication. Neither the publisher nor the authors or the editors give a warranty, expressed or implied, with respect to the material contained herein or for any errors or omissions that may have been made. The publisher remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

show abstract

Rheological behavior of short Alfa fibers reinforced Mater-Bi® biocomposites

Cited by 17 publications

References 39 publications

PBAT Based Composites Reinforced with Microcrystalline Cellulose Obtained from Softwood Almond Shells

PBAT Based Composites Reinforced with Microcrystalline Cellulose Obtained from Softwood Almond Shells

Mater-Bi/Brewers’ Spent Grain Biocomposites—Novel Approach to Plant-Based Waste Filler Treatment by Highly Efficient Thermomechanical and Chemical Methods

Towards Sustainable Buildings with Free-Form Geometries: Development and Application of Flexible NFRP in Load-Bearing Structures

Contact Info

Product

Resources

About