scholarly journals Transparent Poly(methyl methacrylate) Composites Based on Bacterial Cellulose Nanofiber Networks with Improved Fracture Resistance and Impact Strength

ACS Omega ◽  
2019 ◽  
Vol 4 (6) ◽  
pp. 9896-9903 ◽  
Author(s):  
Alba Santmarti ◽  
Jia Wei Teh ◽  
Koon-Yang Lee
Keyword(s):  
Impact Strength ◽  
Methyl Methacrylate ◽  
Bacterial Cellulose ◽  
Fracture Resistance ◽  
Cellulose Nanofiber ◽  
Poly Methyl Methacrylate

scholarly journals Effect of Antibacterial Silver-Releasing Filler on the Physicochemical Properties of Poly(Methyl Methacrylate) Denture Base Material

Materials ◽  
2019 ◽  
Vol 12 (24) ◽  
pp. 4146 ◽  
Author(s):  
Grzegorz Chladek ◽  
Katarzyna Pakieła ◽  
Wojciech Pakieła ◽  
Jarosław Żmudzki ◽  
Marcin Adamiak ◽  
...  
Keyword(s):  
Impact Strength ◽  
Flexural Strength ◽  
Methyl Methacrylate ◽  
Flexural Modulus ◽  
Base Material ◽  
Distilled Water ◽  
Denture Base ◽  
Inorganic Particles ◽  
Poly Methyl Methacrylate ◽  
Enhanced Solubility

Colonization of polymeric dental prosthetic materials by yeast-like fungi and the association of these microorganisms with complications occurring during prosthetic treatment are important clinical problems. In previously presented research, submicron inorganic particles of silver sodium hydrogen zirconium phosphate (S–P) were introduced into poly(methyl methacrylate) (PMMA) denture base material which allowed for obtaining the antimicrobial effect during a 90 day experiment. The aim of the present study was to investigate the flexural strength, impact strength, hardness, wear resistance, sorption, and solubility during three months of storage in distilled water. With increasing S–P concentration after 2 days of conditioning in distilled water, reduced values of flexural strength (107–72 MPa), impact strength (18.4–5.5 MPa) as well as enhanced solubility (0.95–1.49 µg/mm3) were registered, but they were at acceptable levels, and the sorption was stable. Favorable changes included increased hardness (198–238 MPa), flexural modulus (2.9–3.3 GPa), and decreased volume loss during wear test (2.9–0.2 mm3). The percentage changes of the analyzed properties during the 90 days of storage in distilled water were similar for all materials.

Effects of Poly(Methyl Methacrylate)-Encapsulated Nanosilica on Mechanical Properties of Poly(Lactic Acid)/Ethylene Vinyl Acetate Nanocomposites

2018 ◽  
Vol 773 ◽  
pp. 51-55
Author(s):  
Jasmine Pongkasem ◽  
Saowaroj Chuayjuljit ◽  
Phasawat Chaiwutthinan ◽  
Amnouy Larpkasemsuk ◽  
Anyaporn Boonmahitthisud
Keyword(s):  
Mechanical Properties ◽  
Lactic Acid ◽  
Impact Strength ◽  
Methyl Methacrylate ◽  
Tensile Properties ◽  
Vinyl Acetate ◽  
Ethylene Vinyl Acetate ◽  
Poly Lactic Acid ◽  
Poly Methyl Methacrylate ◽  
The Impact

In this study, poly(lactic acid) (PLA) was melt mixed with three weight percentages (10–30wt%) of ethylene vinyl acetate copolymer (EVA) in an internal mixer, followed by a compression molding. According to a better combination of mechanical properties, the 90/10 (w/w) PLA/EVA was selected for preparing hybrid nanocomposites with three loadings (1, 3 and 5 parts per hundred of resin , phr) of poly(methyl methacrylate)-encapsulated nanosilica (PMMA-nSiO2). The nanolatex of PMMA-nSiO2 was synthesized via in situ differential microemulsion polymerization. The obtained PMMA-nSiO2 showed a core-shell morphology with nSiO2 as a core and PMMA as a shell, having an average diameter of 43.4nm. The influences of the EVA and PMMA-nSiO2 on the impact strength and the tensile properties of the PLA/EVA nanocomposites were studied and compared. It is found that the impact strength and the tensile properties of the 90/10 (w/w) PLA/EVA were improved with the appropriate amounts of the EVA and PMMA-nSiO2.

scholarly journals Bacterial Cellulose Network from Kombucha Fermentation Impregnated with Emulsion-Polymerized Poly(methyl methacrylate) to Form Nanocomposite

Polymers ◽  
2021 ◽  
Vol 13 (4) ◽  
pp. 664 ◽  
Author(s):  
Helena Oliver-Ortega ◽  
Shiyu Geng ◽  
Francesc Xavier Espinach ◽  
Kristiina Oksman ◽  
Fabiola Vilaseca
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Methyl Methacrylate ◽  
Bacterial Cellulose ◽  
Microscopy Study ◽  
Uniform Structure ◽  
Poly Methyl Methacrylate ◽  
Pmma Matrix ◽  
3D Network ◽  
Kombucha Tea

The use of bio-based residues is one of the key indicators towards sustainable development goals. In this work, bacterial cellulose, a residue from the fermentation of kombucha tea, was tested as a reinforcing nanofiber network in an emulsion-polymerized poly(methyl methacrylate) (PMMA) matrix. The use of the nanofiber network is facilitating the formation of nanocomposites with well-dispersed nanofibers without using organic solvents or expensive methodologies. Moreover, the bacterial cellulose network structure can serve as a template for the emulsion polymerization of PMMA. The morphology, size, crystallinity, water uptake, and mechanical properties of the kombucha bacterial cellulose (KBC) network were studied. The results showed that KBC nanofibril diameters were ranging between 20–40 nm and the KBC was highly crystalline, >90%. The 3D network was lightweight and porous material, having a density of only 0.014 g/cm3. Furthermore, the compressed KBC network had very good mechanical properties, the E-modulus was 8 GPa, and the tensile strength was 172 MPa. The prepared nanocomposites with a KBC concentration of 8 wt.% were translucent with uniform structure confirmed with scanning electron microscopy study, and furthermore, the KBC network was homogeneously impregnated with the PMMA matrix. The mechanical testing of the nanocomposite showed high stiffness compared to the neat PMMA. A simple simulation of the tensile strength was used to understand the limited strain and strength given by the bacterial cellulose network. The excellent properties of the final material demonstrate the capability of a residue of kombucha fermentation as an excellent nanofiber template for use in polymer nanocomposites.

Preparation of poly(methyl methacrylate) nanocomposites with superior impact strength

2007 ◽  
Vol 105 (6) ◽  
pp. 3183-3194 ◽  
Author(s):  
Dhananjay Singh ◽  
T. Jayasimha ◽  
K. N. Rai ◽  
Anil Kumar
Keyword(s):  
Impact Strength ◽  
Methyl Methacrylate ◽  
Poly Methyl Methacrylate
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