Polyester Composites Reinforced With Maleic Anhydride-Treated Filaments From Mauve

Mesquita, Ricardo Gabriel de Almeida; César, Antônia Amanda da Silva; Mendes, Lourival Marin; Marconcini, J. M.; Tonoli, Gustavo Henrique Denzin

doi:10.1590/01047760201824012453

Cited by 7 publications

(4 citation statements)

References 21 publications

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“…Then they were placed in a prepared solution of maleic anhydride (1 g/100 mL) and heated 120 • C in an oven (Hobersal, Barcelona, Spain) for two hours. The maleic anhydride/filaments mass proportion was 10% [19,20]. For GF surface treatment, 1 wt% aqueous solution of silane coupling agent, with pH adjusted to 4 using acetic acid, was prepared.…”

Section: Pp Yarns and E-gf Pre-treatment (Sizing) Before Braidingmentioning

confidence: 99%

Flexural Strength of Dental Fiber Composite Post Manufactured with a Novel Approach

et al. 2022

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Thermoplastic resin fiber composites have an easy fabrication process, good mechanical properties, and compatible stiffness to tooth dentin. However, they have not yet attracted much interest in the field of dentistry. The current study was carried out to test a new proposed approach to manufacture a fiber reinforced composite endodontic post and evaluate its flexural strength through a two-point inclined loading test. The proposed fiber post manufacture approach depends upon a braiding technique of the glass fibers’ (GF) reinforcing component with thermoplastic polypropylene (PP) resin fibers that will later represent the resin matrix after thermal melting. Posts were made of different core (70%) and sheath (30%) construction (PP/GF ratios) using three different GF types and seizing pre-treatment to both fiber types. Two-point inclined loading test at 45 °C applied force angle was used to test the posts’ flexural strength. Fiber posts (1.6 mm in diameter) with pure GF (de-sized starch E-GF and pre-silanized S-GF) core, and sheath construction with higher PP/GF ratios, showed the significantly highest two-point bending strength (56.67 ± 4.89 and 53.96 ± 1.81 MPa, respectively), among experimental posts groups (except for the commercial control posts). However, posts with PP core type showed the lowest values (21.59 ± 1.86 and 16.54 ± 1.94 MPa for de-sized and E-glass sheath fibers, respectively). Based on these findings, the proposed approach was reliable in producing fiber-reinforced composite post with the desired dimensions and fiber distribution. Post construction with a pure GF core and higher PP/GF ratio showed considerably higher flexural strength and GF volume fraction comparable to commercial available post types.

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Section: Pp Yarns and E-gf Pre-treatment (Sizing) Before Braidingmentioning

confidence: 99%

Flexural Strength of Dental Fiber Composite Post Manufactured with a Novel Approach

et al. 2022

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“…Furthermore, they are highly variable and can be sourced from many different plants (Khanam et al, 2007) across several geographical locations. They can be used to produce papers (Sharma et al, 2019), useful chemicals (Naeimi et al, 2018), fuels (Bufalino et al, 2018;Naiemi et al, 2018;Protásio et al, 2013), and composites materials applicable to the automobile and construction industries (Khanam et al, 2007;Bongarde and Shinde, 2014;Mesquita et al, 2018;Shulga et al, 2019). However, fiber performance on the microscale and the necessity of fibers' pretreatments has limited their application continuously in the biomaterial field, which mandates alteration of morphological, chemical, and physical properties (Shulga et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Cellulose nanostructured films from pretreated açaí mesocarp fibers: physical, barrier, and tensile performance

Braga

Abreu

Silva

et al. 2021

CERNE

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Background: During de-pulping of açai (Euterpe oleracea) for juice production in the Amazonia, large amounts of fibrous waste are daily discarded, a promising substrate for production of high-value cellulose nanofibrils. Therefore, this study sought to evaluate the modifications of açai surface fibers submitted to chemical pretreatment steps and compare the quality of nanostructured films produced with different cycles of mechanical nanofibrillation. Results:A 2-hour pretreatment (at 5% of NaOH) followed by two NaOH/H 2 O 2 bleaching steps resulted in fibers with increased length and reduced diameter compared to raw fibers while preserving fiber integrity and cellulose I structure. The increase of fibers' grinding cycles from 3 (minimum to gel point) to 21 (maximum suspension thickness) resulted in nanofibril films with higher crystallinity properties, uniform thickness, compacted morphology, and smoother surface. Nanofibril films formed after different numbers of passages exhibited similar mechanical strength, but distinct barrier properties. Conclusion:Açaí waste films produced with fibers submitted to 3 grinding cycles can be recommended for packaging applications that demand easily dissolving, such as instantaneous food. Oppositely, açaí fibers subjected to 21 cycles in grinder provide films suitable for water-resistant packaging, ideal for secondary coatings of papers and paperboards.

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“…Os painéis de partículas de madeira de média densidade (MDP), conforme descrevem Mesquita, Mendes, Mendes, Tonoli, & Marconcini (2015), foram considerados como uma evolução dos painéis aglomerados, pois passaram a ser produzidos com três camadas, duas de partículas finas nas faces e uma de partículas maiores no miolo, sendo utilizados para a fabricação de móveis. Contudo, a razão mais adequada para nova denominação seriam os investimentos na modernização tecnológica das empresas brasileiras que, na metade da década de 1990, possibilitaram a fabricação de produtos com menor absorção de umidade e maior resistência ao arrancamento de parafusos e ao empenamento.…”

Section: Introductionunclassified

“…No segmento industrial de base florestal constata-se, anualmente, uma crescente demanda por madeira e, com isso, as indústrias têm buscado diversificar suas fontes de matérias-primas para complementar a produção de painéis reconstituídos (MDP e HDP) (Melo et al, 2009;Stangerlin, Melo, Garlet, & Gatto, 2011;Gauss, Araujo, Gava, Cortez-Barbosa, & Savastano Jr, 2019;Talgatti et al, 2019). A matéria-prima para produção destes painéis pode ser todo e qualquer material lignocelulósico, podendo-se ainda se utilizar da mistura de diferentes fontes (Soratto, Cunha, Vital, Carneiro, & Costa, 2013;Mesquita et al, 2015;Cravo, Sartori, Fiorelli, Balieiro, & Savastano Junior, 2015).…”

Section: Introductionunclassified

Propriedades físicas de painéis de alta densidade (HDP) de pinus, bambu e coparticipação de erva-mate

Rusch¹,

Mustefaga

Hillig

et al. 2020

RSD

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The objective of this study was to evaluate the physical properties of high density particleboard (HDP) produced with pine, bamboo and co-participation of yerba mate, by means of mixtures modeling. Particles of bamboo (Phyllosttachys aurea), finely chopped sticks of yerba mate (Ilex paraguariensis) and Pinus taeda wood were used. These particles, in different proportions of mixtures, were glued in a drum-type rotary mixer with Melamine-Urea-Formaldehyde (MUF) resin, handmade molded and pressed in hydraulic press at 120 °C and 60 kgf.cm-2 for 10 minutes, up to the thickness of the 6 mm. The panels were produced with 0.90 g.cm-³ of nominal density and, after pressing, were stabilized in an air-conditioned environment at 20º C and 65% of the relative humidity. Statistical analysis follows simplex centroid planning, with seven combinations of the three components and three replicates. It was found that the apparently density, moisture content, thickness swelling (2 and 24 hours water immersion), water absorption (2 hours), are explained by the cubic model, while the water absorption (24 hours) are explained by the quadratic model. The materials used made it possible to produce high density particleboard (HDP) with physical properties that varied according to the different mixtures, however, the best results were observed for the panels produced with bamboo and Pinus taeda.

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Polyester Composites Reinforced With Maleic Anhydride-Treated Filaments From Mauve

Cited by 7 publications

References 21 publications

Flexural Strength of Dental Fiber Composite Post Manufactured with a Novel Approach

Flexural Strength of Dental Fiber Composite Post Manufactured with a Novel Approach

Cellulose nanostructured films from pretreated açaí mesocarp fibers: physical, barrier, and tensile performance

Propriedades físicas de painéis de alta densidade (HDP) de pinus, bambu e coparticipação de erva-mate

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