Poly (Methyl Methacrylate)-SiC Nanocomposites Prepared Through in Situ Polymerization

Tommasini, Flávio James; Ferreira, Leonardo da Cunha; Tienne, Lucas Galhardo Pimenta; Aguiar, Vinícius de Oliveira; Silva, Marcelo Henrique Prado da; Rocha, Luiz; Marques, Maria de Fátima Vieira

doi:10.1590/1980-5373-mr-2018-0086

Cited by 60 publications

(35 citation statements)

References 23 publications

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“…As shown in Figure 7, the peak at approximately 1060 cm −1 is attributed to the C–O–C of pyranose ring stretching from cellulose [56,57] and that at ca. 754 cm −1 is ascribed to α –methyl group vibrations from PMMA [58]. We thus normalized the curves based on the intensity of 1060 cm -1 .…”

Section: Resultsmentioning

confidence: 99%

Surface-Initiated Initiators for Continuous Activator Regeneration (SI ICAR) ATRP of MMA from 2,2,6,6–tetramethylpiperidine–1–oxy (TEMPO) Oxidized Cellulose Nanofibers for the Preparations of PMMA Nanocomposites

Tsai

Chang

et al. 2019

Polymers

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An effective method of oxidation from paper pulps via 2,2,6,6–tetramethylpiperidine–1–oxy (TEMPO) compound to obtain TEMPO-oxidized cellulose nanofibers (TOCNs) was demonstrated. Following by acylation, TOCN having an atom transfer radical polymerization (ATRP) initiating site of bromoisobutyryl moiety (i.e., TOCN–Br) was successfully obtained. Through a facile and practical technique of surface-initiated initiators for continuous activator regeneration atom transfer radical polymerization (SI ICAR ATRP) of methyl methacrylate (MMA) from TOCN–Br, controllable grafting polymer chain lengths (Mn = ca. 10k–30k g/mol) with low polydispersity (PDI < 1.2) can be achieved to afford TOCN–g–Poly(methyl methacrylate) (PMMA) nanomaterials. These modifications were monitored by Fourier-transform infrared spectroscopy (FT–IR), scanning electron microscopy (SEM), electron spectroscopy for chemical analysis (ESCA), and water contact angle analysis. Eventually, TOCN–g–PMMA/PMMA composites were prepared using the solvent blending method. Compared to the pristine PMMA (Tg = 100 °C; tensile strength (σT) = 17.1 MPa), the composites possessed high transparency with enhanced thermal properties and high tensile strength (Tg = 110 °C and σT = 37.2 MPa in 1 wt% TOCN containing case) that were investigated by ultraviolet-visible spectroscopy (UV-Vis), thermogravimetric analysis (TGA), dynamic mechanical analysis (DMA), and tensile tests. We demonstrated that minor amounts of TOCN–g–PMMA nanofillers can provide high efficacy in improving the mechanical and thermal properties of PMMA matrix.

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Section: Resultsmentioning

confidence: 99%

Surface-Initiated Initiators for Continuous Activator Regeneration (SI ICAR) ATRP of MMA from 2,2,6,6–tetramethylpiperidine–1–oxy (TEMPO) Oxidized Cellulose Nanofibers for the Preparations of PMMA Nanocomposites

Tsai

Chang

et al. 2019

Polymers

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“…Zirconia behave as highly functional physical cross-links, and hence reduce the overall mobility of the polymer chains, even when interactions with the polymers are only on a physical level [49, 50]. The embedding of modified nano zirconia slightly increases the Tg of the composite as a consequence of an interaction between the modified zirconia interface and acrylic resin [51]. Interfacial Si-O bond formation on the surface of zirconia enables chemical bonding with polymer matrix [50–54].…”

Section: Resultsmentioning

confidence: 99%

Hybrid denture acrylic composites with nanozirconia and electrospun polystyrene fibers

Elmadani

Radović

Tomić³

et al. 2019

PLoS ONE

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The processing and characterization of hybrid PMMA resin composites with nano-zirconia (ZrO2) and electrospun polystyrene (PS) polymer fibers were presented in this study. Reinforcement was selected with the intention to tune the physical and mechanical properties of the hybrid composite. Surface modification of inorganic particles was performed in order to improve the adhesion of reinforcement to the matrix. Fourier transform infrared spectroscopy (FTIR) provided successful modification of zirconia nanoparticles with 3-Methacryloxypropyltrimethoxysilane (MEMO) and bonding improvement between incompatible inorganic nanoparticles and PMMA matrix. Considerable deagglomeration of nanoparticles in the matrix occurred after the modification has been revealed by scanning electron microscopy (SEM). Microhardness increased with the concentration of modified nanoparticles, while the fibers were the modifier that lowers hardness and promotes toughness of hybrid composites. Impact test displayed increased absorbed energy after the PS electrospun fibers had been embedded. The optimized composition of the hybrid was determined and a good balance of thermal and mechanical properties was achieved.

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“…Peaks belonging to BG, PMMA and Neem were identified. Thus, peaks attributed to the bending vibration modes of Si-O in BG (990 cm −1 ) [56] and to PMMA (at 1727, 1433, 1195, 1148 cm −1 ) [57,58] are clearly visible. As known, Neem is an organic compound with many components and molecular bonds, among which in Figure 2 are visible the folowing: (i) 1700-1500 cm -1 band, representative of N-H and C = O groups (aldehydes, ketones and esters); (ii) 1500-1350 cm -1 band, corresponding to the aromatic domain, especially N-H groups; and (iii) 1300-1500 cm -1 band, confirming the presence of alkenes [59,60].…”

Section: Surface Characterization Of As-deposited Structuresmentioning

confidence: 99%

Functional Bioglass—Biopolymer Double Nanostructure for Natural Antimicrobial Drug Extracts Delivery

et al. 2020

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Aseptic loosening and periprosthetic infections are the main causes of implant failure. Strategies to mitigate this drawback are therefore mandatory to avoid primary and revision replacement surgeries. A functional bioapatite–biopolymer double nanostructure fabricated by matrix-assisted pulsed laser evaporation to prevent infection of orthopedic and dental implants could promote osseointegration and ensure controlled delivery of natural antimicrobial drugs. The synthesized nanostructure consists of two overlapping layers, the lower from a biocompatible polymer for anticorrosive protection, and the upper of bioactive glass incorporating antimicrobial plant extract, acting as a potential drug delivery system. Morphology, composition, adherence, ability for drug delivery and biological properties (cytotoxicity and antimicrobial effect) were studied. Structures proved compact and stable, conserving a remarkable drug delivery ability for more than 21 days, i.e., enough to ensure long-term microbes’ eradication.

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Poly (Methyl Methacrylate)-SiC Nanocomposites Prepared Through in Situ Polymerization

Cited by 60 publications

References 23 publications

Surface-Initiated Initiators for Continuous Activator Regeneration (SI ICAR) ATRP of MMA from 2,2,6,6–tetramethylpiperidine–1–oxy (TEMPO) Oxidized Cellulose Nanofibers for the Preparations of PMMA Nanocomposites

Surface-Initiated Initiators for Continuous Activator Regeneration (SI ICAR) ATRP of MMA from 2,2,6,6–tetramethylpiperidine–1–oxy (TEMPO) Oxidized Cellulose Nanofibers for the Preparations of PMMA Nanocomposites

Hybrid denture acrylic composites with nanozirconia and electrospun polystyrene fibers

Functional Bioglass—Biopolymer Double Nanostructure for Natural Antimicrobial Drug Extracts Delivery

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