Characterization of polystyrene nanocomposites and expanded nanocomposites reinforced with cellulose nanofibers and nanocrystals

Neves, Roberta Motta; Lopes, Kirk Silveira; Zimmermann, Matheus Vinícius Gregory; Poletto, Matheus; Zattera, Ademir J.

doi:10.1007/s10570-019-02392-2

Cited by 39 publications

(26 citation statements)

References 48 publications

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“…According to refs. 17,50,51 particle reinforcements, such as YM, restrict the epoxy polymeric chains, requiring a higher energy for the movement of these polymeric chains, displacing E ' g to greater values. In the transition region (II), the increase of free volume of the components leads to an increase in the molecular mobility and a drop of E ' is observed 46 .…”

Section: Resultsmentioning

confidence: 99%

“…Unlike E ', E '' is an irreversible measure 12,17 . The curve behavior with temperature is explained by increasing temperatures, E '' values increases until reaching T g , the peak of the curve, and then, decreases with increasing temperature 48,50 . In addition, it is claimed that the peak presents the maximum mobility point of the chains being the most correct way of determining the T g value of the materials 51 .…”

Section: Resultsmentioning

confidence: 99%

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Thermal and dynamic mechanical behavior of epoxy composites reinforced with post‐consumed yerba mate

Neves

Vanzetto

Lazzari

et al. 2021

J of Applied Polymer Sci

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Yerba mate (YM) is widely consumed in Latin American countries, and its residues can be used as bio‐resources such as reinforced in epoxy composites. The present work aims to produce epoxy resin composites and evaluate the influence of post‐consumed YM as reinforcement. The concentrations of YM used were 5, 10, and 20% (wt/wt). Chemical, thermal, morphological, and dynamic mechanical behaviors were explored. The YM incorporation did not influence chemically on the epoxy structure and a pull‐out phenomenon was observed as YM content increased. The YM at lower concentrations (5 and 10%) led to higher values of activation energies calculated from model‐free isoconversional methods. On the other hand, the composite e/YM 20 wt% improved all dynamic‐mechanical properties. YM proved to be a suitable and cheap reinforcement for epoxy resin.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Thermal and dynamic mechanical behavior of epoxy composites reinforced with post‐consumed yerba mate

Neves

Vanzetto

Lazzari

et al. 2021

J of Applied Polymer Sci

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“…Nanocellulose exhibits some exclusive features such as exceptional mechanical properties (i.e., low density, high flexibility, and strength while being chemically inert) (Lavoine and Bergström, 2017) and thermal properties (Gan et al, 2020). Over the past few decades, many research studies have been conducted on the reinforcement of polymer matrix nanocomposites, for instance, natural rubber nanocomposites (Neto et al, 2016;Cao et al, 2018;Dominic et al, 2020), polylactic acid nanocomposites (Gitari et al, 2019;Rigotti et al, 2019), epoxy nanocomposites (Ayrilmis et al, 2019;Yan et al, 2019;Yue et al, 2019), and polystyrene nanocomposites (Clarke et al, 2019;Neves et al, 2019), where nanocellulose has been introduced as a reinforcing agent.…”

Section: Properties and Surface Modification Of Nanocellulose Charactmentioning

confidence: 99%

Nanocellulose: From Fundamentals to Advanced Applications

et al. 2020

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Over the past few years, nanocellulose (NC), cellulose in the form of nanostructures, has been proved to be one of the most prominent green materials of modern times. NC materials have gained growing interests owing to their attractive and excellent characteristics such as abundance, high aspect ratio, better mechanical properties, renewability, and biocompatibility. The abundant hydroxyl functional groups allow a wide range of functionalizations via chemical reactions, leading to developing various materials with tunable features. In this review, recent advances in the preparation, modification, and emerging application of nanocellulose, especially cellulose nanocrystals (CNCs), are described and discussed based on the analysis of the latest investigations (particularly for the reports of the past 3 years). We start with a concise background of cellulose, its structural organization as well as the nomenclature of cellulose nanomaterials for beginners in this field. Then, different experimental procedures for the production of nanocelluloses, their properties, and functionalization approaches were elaborated. Furthermore, a number of recent and emerging uses of nanocellulose in nanocomposites, Pickering emulsifiers, wood adhesives, wastewater treatment, as well as in new evolving biomedical applications are presented. Finally, the challenges and opportunities of NC-based emerging materials are discussed.

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“…The values of the storage modulus at −50 and 30°C were used for E' G and E' R . A higher reinforcing efficiency, illustrated by a lower value of coefficient C, 56,58 0.63 instead of 1.08, was obtained for PUEO/10MFC compared to PUBA/10MFC. This result shows the influence of both MFC and different soft segments of TPUs, which led to better polymer‐fibers interactions and better MFC dispersion in the first case.…”

Section: Resultsmentioning

confidence: 86%

“…The coefficient C was determined for quantifying the reinforcing effectiveness of MFC in both types of polyurethane composites 57,58 :

C = \frac{{((), E_{G}^{'} / E_{R}^{'})}_{composite}}{{((), E_{G}^{'} / E_{R}^{'})}_{TPU}},

where E' G and E' R are the storage modulus values in the glassy and rubbery region for the composites and neat TPUs. The values of the storage modulus at −50 and 30°C were used for E' G and E' R .…”

Section: Resultsmentioning

confidence: 99%

Influence of microfibrillated cellulose and soft biocomponent on the morphology and thermal properties of thermoplastic polyurethanes

Panaitescu

Nicolae

Melinte³

et al. 2021

J of Applied Polymer Sci

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Composite materials from thermoplastic polyurethanes (TPUs) with biodegradable segments and microfibrillated cellulose (MFC) were developed as alternatives to traditional materials used in packaging or biomedical applications. Two TPUs were synthesized by the prepolymer method starting from different soft segments, poly(ε‐caprolactone)/poly(butylene adipate) (PUBA) or poly(ε‐caprolactone)/poly(ethylene oxide) (PUEO), and isophorone diisocyanate/aliphatic chain extender. Proton nuclear magnetic resonance (1H NMR) confirmed the structure and Fourier transform infrared spectroscopy (FTIR) along with scanning electron microscopy showed that the soft segments with different hydrophobicity led to a higher phase mixing in PUBA and improved microphase separation in PUEO. MFC was added in the TPUs with different soft segments to increase biocompatibility, strength, and degradation rate. A better thermal stability, a gradual increase of crystallinity and a better dispersion of MFC were noticed in PUEO composites compared to PUBA ones. The crystallinity increased with 78% and 50% in PUBA and PUEO composites with 5 wt% MFC compared to the neat polyurethanes showing the nucleating ability of MFC. In addition, the enhanced storage modulus, with 75% and 25% in PUEO and PUBA composites, highlighted the reinforcing efficiency of MFC. Therefore, the addition of MFC to the already synthesized TPUs allows tailoring the morphology and thermal properties of TPUs for industrial application.

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Characterization of polystyrene nanocomposites and expanded nanocomposites reinforced with cellulose nanofibers and nanocrystals

Cited by 39 publications

References 48 publications

Thermal and dynamic mechanical behavior of epoxy composites reinforced with post‐consumed yerba mate

Thermal and dynamic mechanical behavior of epoxy composites reinforced with post‐consumed yerba mate

Nanocellulose: From Fundamentals to Advanced Applications

Influence of microfibrillated cellulose and soft biocomponent on the morphology and thermal properties of thermoplastic polyurethanes

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