Melt processing of polymer biocomposites

Marinho, Juliana França; Braga, Natália Ferreira; Krohn, Annelise; Myata, Fernanda Salviano; Silveira, Luiz Henrique da; Neto, Abner Cabral; Fechine, Guilhermino J. M.

doi:10.1590/0104-1428.1847

Cited by 8 publications

(5 citation statements)

References 13 publications

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“…The chemical compositions of white pines and Holo-Fibers were characterized using a method reported by Van Soest et al 45 The saline coupling reaction was characterized using attenuated total reflectance-Fourier-transform infrared (ATR-FTIR) spectroscopy (Nicolet 5700, Thermo Fisher Scientific), in which a wavelength range of 4000−500 cm −1 and 40 scans were used, with a resolution of 0.09 cm −1 . Solid-state 13 C nuclear magnetic resonance (NMR) experiments were performed on a spectrometer (AVANCE NEO 600WB, Bruker, GER) by using a total sideband suppression (TOSS) sequence. The measurements were at ambient temperature with a spinning rate of 10 kHz, a recycle delay of 3 s, and 2000 scans.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Cellulosic materials are promising candidates owing to abundant resources and low cost. Natural plant fibers − and microcrystalline cellulose (MCC) − have been used to reinforce PBAT. The corresponding composites showed significant improvements in tensile modulus, but the tensile strength and elongation at break decreased dramatically.…”

Section: Introductionmentioning

confidence: 99%

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Biodegradable Poly(butylene adipate-co-terephthalate) Nanocomposites Reinforced with In Situ Fibrillated Nanocelluloses

Wang,

Jin,

Lim

et al. 2023

ACS Sustainable Chem. Eng.

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The enhancement of mechanical properties is highly required for the expanded applications of biodegradable polymers like poly(butylene adipate-co-terephthalate) (PBAT). The use of nanocellulose as reinforcing fillers is one of the effective approaches while preserving the biodegradability of polymers, but the dispersion of nanofibers in polymer matrixes is a great challenge. Here, we report an in situ fibrillation method to prepare nanocellulose-reinforced PBAT composite films with superior mechanical properties and enhanced degradability while promoting the easy dispersion of natural plant fibers in the polymer matrix, which overcome the limitation of natural fiber composites for thin film applications. A hemicellulose-rich holocellulose fiber was selected and silanized prior to melt compounding with PBAT, in which in situ fibrillation of fibers and the dispersion of in situ fibrillated cellulose nanofibrils (CNFs) occurred simultaneously. The nanostructure, mechanical properties, and degradability of the resulting composite films were characterized. Compared with pristine PBAT, the incorporation of 1 wt % CNF fillers increased the tensile modulus by 82% while possessing a tensile strength of 26 MPa, an elongation of 372%, and a toughness of 75 MJ/m 3 , surpassing most reported data. Moreover, the degradability of PBAT was enhanced as well. Altogether, this study paves a new way of making biodegradable nanocomposites, which expand the application areas, especially where films are required.

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Section: ■ Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Biodegradable Poly(butylene adipate-co-terephthalate) Nanocomposites Reinforced with In Situ Fibrillated Nanocelluloses

Wang,

Jin,

Lim

et al. 2023

ACS Sustainable Chem. Eng.

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“…Recently, reactive extrusion (REX) is being used to overcome the aforementioned drawbacks, considering that functional molecules are anchored into the polymeric matrix. REX technology provides stable and irreversible covalent bonds, achieving a uniform distribution of functional moieties into the polymer matrix and avoiding particle aggregation, migration, and leaching [24][25][26]. Furthermore, reactive extrusion offers a one-step solvent-free route to produce novel and high-performance materials with new functionalities [27].…”

Section: Introductionmentioning

confidence: 99%

Improved Mechanical, Thermal, and Hydrophobic Properties of PLA Modified with Alkoxysilanes by Reactive Extrusion Process

et al. 2021

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An eco-friendly strategy for the modification of polylactic acid (PLA) surface properties, using a solvent-free process, is reported. Reactive extrusion (REX) allowed the formation of new covalent bonds between functional molecules and the PLA polymeric matrix, enhancing its mechanical properties and modifying surface hydrophobicity. To this end, the PLA backbone was modified using two alkoxysilanes, phenyltriethoxysilane and N-octyltriethoxysilane. The reactive extrusion process was carried out under mild conditions, using melting temperatures between 150 and 180 °C, 300 rpm as screw speed, and a feeding rate of 3 kg·h−1. To complete the study, flat tapes of neat and functionalized PLA were obtained through monofilament melt extrusion to quantify the enhancement of mechanical properties and hydrophobicity. The results verified that PLA modified with 3 wt% of N-octyltriethoxysilane improves mechanical and thermal properties, reaching Young’s modulus values of 4.8 GPa, and PLA hydrophobic behavior, with values of water contact angle shifting from 68.6° to 82.2°.

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“…Natural fibers are an alternative that can help solve ecological and environmental problems (Goda et al 2006), as they replace glass fiber, aramid, carbon, or nylon as reinforcing materials in polymeric matrices to enhance the mechanical properties (Kim and Netravali 2010;Marinho et al 2015;Sanjay et al 2015;Luna et al 2016). These fibers increase the tensile and flexural resistance of materials (de Morais et al 2016).…”

Section: Introductionmentioning

confidence: 99%

Characterization of NaOH-treated Colombian silverskin coffee fiber as a composite reinforcement

Ochoa

Rojas-Vargas

Costa

2017

BioRes

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The effects of an alkali treatment with NaOH (5%, 10%, and 15%) was studied relative to the tensile and flexural mechanical properties of Colombian coffee silverskin fiber (CCSF)/polyester biocomposites. The CCSF was treated with NaOH for 30 min and then dried at 50 °C for 5 h. Laminates with a 35.1% volume fraction of fiber were prepared using a hand lay up manufacturing technique. Scanning electron microscopy was used to study the fiber morphology. The results revealed that the specific maximum tensile and flexural strengths increased by 36.3% and 25.1%, respectively, the specific tensile and flexural moduli increased by 31.6% and 147.0%, respectively, and the tensile toughness was 67.9% higher compared with the untreated biocomposite. The flexural toughness decreased by 62.0%. The results suggested that mercerization is an effective method to treat CCSF/polyester biocomposites.

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Melt processing of polymer biocomposites

Cited by 8 publications

References 13 publications

Biodegradable Poly(butylene adipate-co-terephthalate) Nanocomposites Reinforced with In Situ Fibrillated Nanocelluloses

Biodegradable Poly(butylene adipate-co-terephthalate) Nanocomposites Reinforced with In Situ Fibrillated Nanocelluloses

Improved Mechanical, Thermal, and Hydrophobic Properties of PLA Modified with Alkoxysilanes by Reactive Extrusion Process

Characterization of NaOH-treated Colombian silverskin coffee fiber as a composite reinforcement

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