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.

Mechanical Properties of Polyamide 6 (Pa6) / Ethylene Vinyl Acetate (Eva) / Sepiolite Composite

2014 ◽  
Vol 554 ◽  
pp. 62-65 ◽  
Author(s):  
Noora Tiqah Mohamad Fauzi ◽  
Zurina Mohamad
Keyword(s):  
Mechanical Properties ◽  
Impact Strength ◽  
Vinyl Acetate ◽  
Ethylene Vinyl Acetate ◽  
Polyamide 6 ◽  
The Other ◽  
Screw Extruder ◽  
Twin Screw ◽  
Moulding Machine ◽  
The Impact

The objective of this study is to investigate the effect of sepiolite concentration (2-10 phr) on the mechanical properties of polyamide 6 (PA6) / ethylene vinyl acetate (EVA) blend at the ratio 80/20. Twin screw extruder and injection moulding machine were used to prepare the samples. The strength and modulus of flexural was increased until 6 phr of sepiolite content. On the other hand, the impact strength of PA6/EVA/sepiolite composite was decreased gradually as sepiolite content increased.

Synergistic effects in mechanical properties of PLA/PCL blends with optimized composition, processing, and morphology

RSC Advances ◽  
2015 ◽  
Vol 5 (120) ◽  
pp. 98971-98982 ◽  
Author(s):  
Aleksandra Ostafinska ◽  
Ivan Fortelny ◽  
Martina Nevoralova ◽  
Jiri Hodan ◽  
Jana Kredatusova ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Lactic Acid ◽  
Impact Strength ◽  
Synergistic Effects ◽  
Poly Lactic Acid ◽  
The Individual ◽  
The Impact

Blending of poly(lactic acid) with poly(ε-caprolactone) can increase the impact strength above the values of the individual components.

Effects of Processing Parameters and Nanofillers on Mechanical and Thermal Properties and Morphology of Impact Modified Poly (lactic acid)

2013 ◽  
Vol 1499 ◽  
Author(s):  
Eda Acik ◽  
Ulku Yilmazer
Keyword(s):  
Mechanical Properties ◽  
Lactic Acid ◽  
Thermal Properties ◽  
Impact Strength ◽  
Random Copolymer ◽  
Processing Parameters ◽  
Poly Lactic Acid ◽  
Mechanical And Thermal Properties ◽  
Injection Molded ◽  
The Impact

ABSTRACTTernary nanocomposites of poly (lactic acid) (PLA) were produced by melt blending with two types of elastomers and five types of organoclays to obtain improved mechanical properties such as tensile strength, modulus and impact strength. One of the elastomers is a random copolymer of ethylene and glycidyl methacrylate (E-GMA) and the other one is a random terpolymer of ethylene-butyl acrylate-maleic anhydride (E-BA-MAH). Organically modified montmorillonites (OMMT) were utilized as nanofillers. XRD, DSC, tensile and impact tests were done on the injection molded samples. FTIR, SEM and TEM analyses are still in progress. As preliminary results, thermal analysis showed that the addition of compatibilizers and organoclays does not have a distinct effect on the thermal properties of the composites, and no evidence of nucleation activity of compatibilizers or organoclays was found. For all types of organoclays, the nanocomposites produced with E-GMA exhibited better mechanical properties in comparison to nanocomposites containing E-BA-MAH, especially for the impact strength.

scholarly journals Kinetics of formation and viscoelastic and mechanical properties of optically transparent interpenetrating networks of poly(methyl methacrylate)/polyurethane

2020 ◽  
pp. 83-90
Keyword(s):  
Mechanical Properties ◽  
Impact Strength ◽  
Methyl Methacrylate ◽  
Polymer Networks ◽  
Interpenetrating Polymer Network ◽  
Interpenetrating Networks ◽  
Poly Methyl Methacrylate ◽  
Breaking Elongation ◽  
Optically Transparent ◽  
The Impact

An optically transparent material with enhanced physical-mechanical properties was synthesized, which is based on the in situ formed sequential interpenetrating polymer networks of poly(methyl methacrylate)/polyurethane with an oligoester component. The kinetic features of polymerization of methyl methacrylate in these systems were studied. It was established that the polymerization rate of methyl methacrylate increases with an increase in the content of a polyurethane component, which results from an increase in the system viscosity. Irrespective of the content of polyurethane (15, 20 or 25 wt.%), optically transparent materials with a light transmission coefficient of about 90% were formed. The method of dynamic mechanical analysis showed that the modification of cross-linked poly(methyl methacrylate) with cross-linked polyurethane led to a decrease in the value of the elastic modulus; the value of the loss modulus being increased with an increase in polyurethane content. This indicated bot a decrease in fragility and the improvement in impact strength of the glass-like material. According to the study of physical-mechanical properties of the materials, the presence of polyurethane in their composition resulted in an increase in the impact strength and relative breaking elongation and in the reduction of the Young modulus. It was found that the interpenetrating polymer network containing 20% of polyurethane showed the best values of breaking strength, breaking elongation and Charpy impact.

Preparation and characterization of EVA/PLA/sugarcane bagasse composites for water purification

2016 ◽  
Vol 51 (9) ◽  
pp. 1169-1186 ◽  
Author(s):  
TA Makhetha ◽  
K Mpitso ◽  
AS Luyt
Keyword(s):  
Lactic Acid ◽  
Vinyl Acetate ◽  
Sugarcane Bagasse ◽  
Ethylene Vinyl Acetate ◽  
Poly Lactic Acid ◽  
Melt Mixing ◽  
Lower Viscosity ◽  
Monolayer Adsorption ◽  
Sample Water ◽  
The Impact

Poly(lactic acid)/ethylene vinyl acetate blends and poly(lactic acid)/ethylene vinyl acetate/sugarcane bagasse composites were prepared by melt mixing. The lower viscosity of poly(lactic acid), the lower interfacial tension between poly(lactic acid) and sugarcane bagasse, and the wetting coefficient of poly(lactic acid)/sugarcane bagasse being larger than one, all suggested that sugarcane bagasse would preferably be in contact with poly(lactic acid). A fairly good dispersion of sugarcane bagasse was observed in the composites. Exposed fibre ends were observed in the composite micrographs, which were believed to add to the efficiency of metal adsorption. The impact properties depended more on the poly(lactic acid):ethylene vinyl acetate ratio than on the presence of sugarcane bagasse. The poly(lactic acid)/ethylene vinyl acetate blends showed two melting peaks at approximately the same temperatures as those of the neat polymers, which confirms the complete immiscibility of poly(lactic acid) and ethylene vinyl acetate at all the investigated compositions. Sugarcane bagasse-related weight loss occurred at higher temperatures for sugarcane bagasse in the composites, which could have been the result of the sugarcane bagasse being protected by the polymers, or a delay in the diffusion of the sugarcane bagasse decomposition products out of the sample. Water absorption increased with an increase in sugarcane bagasse loading in the composites. More lead was adsorbed than one would expect if the partial coverage of the fibre by the polymer is taken into account, and therefore it may be assumed that some of the lead was trapped inside the cavities in the composites and that the polymers may also have played a role in the metal complexation process, since both polymers have functional groups that could interact with the lead ions. The metal impurities underwent monolayer adsorption.

Mechanical Properties and Phase Morphology of Poly(Lactic Acid)/Acrylonitrile-Butadiene Rubber/Organoclay Nanocomposites Prepared by Melt Blending

2018 ◽  
Vol 775 ◽  
pp. 13-19
Author(s):  
Sirirat Wacharawichanant ◽  
Kasana Chomphunoi ◽  
Chawisa Wisuttrakarn ◽  
Manop Phankokkruad
Keyword(s):  
Mechanical Properties ◽  
Lactic Acid ◽  
Impact Strength ◽  
Phase Morphology ◽  
Poly Lactic Acid ◽  
Butadiene Rubber ◽  
Melt Blending ◽  
Acrylonitrile Butadiene Rubber ◽  
Internal Mixer ◽  
The Impact

This work investigated the mechanical properties and phase morphology of poly(lactic acid) (PLA)/acrylonitrile-butadiene rubber (NBR) blends and nanocomposites, which prepared by melt blending in an internal mixer. The contents of NBR were 5, 10, 15 and 20 wt% and the content of organoclay was 3 phr. The impact test showed that the impact strength of PLA/NBR blends increased with an increase of NBR content and the impact strength of the blends was more than eight times by adding NBR 10 wt% when compared with neat PLA. The tensile test showed that Young’s modulus and tensile strength of PLA/NBR blends and nanocomposites decreased after adding NBR and organoclay. While the strain at break of the NBR blends increased with increasing NBR content. This result is attributed to the rubber phase in NBR in a cause the increment of elongation and elasticity in PLA/NBR blends. The morphology of PLA/NBR blends observed the fractured surface was rougher than that of pure PLA. This observation indicates that the addition of NBR in PLA can change the brittle fracture of PLA to ductile fracture, which has an effect to the strain at break or elongation of PLA. However, the morphology of the PLA/NBR blends were also observed the phase separation of the dispersed NBR phase and PLA matrix phase, and appeared the voids in a polymer matrix. The addition of organoclay had an effect slightly on the morphology of the blends. From X-ray diffraction, results found that PLA/organoclay and PLA/NBR/organoclay nanocomposites showed the intercalated structure, which PLA chains were inserted into the interlayer of clay due to the increase of d-spacing.

Rheology, Mechanical Properties and Morphology of Poly(lactic acid)/Ethylene Vinyl Acetate Blends

2019 ◽  
Vol 27 (7) ◽  
pp. 1439-1448 ◽  
Author(s):  
Pankaj Agrawal ◽  
Aylanna P. M. Araújo ◽  
Jéssica C. C. Lima ◽  
Shirley N. Cavalcanti ◽  
Daniel M. G. Freitas ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Lactic Acid ◽  
Vinyl Acetate ◽  
Ethylene Vinyl Acetate ◽  
Poly Lactic Acid

Rubber Toughened Polyamide 6/High Density Polyethylene/HDPE-g-MAH Nanocomposites with Ethylene Vinyl Acetate

2013 ◽  
Vol 594-595 ◽  
pp. 745-749
Author(s):  
Farizah Hamid ◽  
Suffiyana Akhbar ◽  
Ku Halim Ku Hamid
Keyword(s):  
Mechanical Properties ◽  
Impact Strength ◽  
Vinyl Acetate ◽  
Tensile Modulus ◽  
Ethylene Vinyl Acetate ◽  
Polyamide 6 ◽  
Hardness Tester ◽  
Rubber Toughened ◽  
Impact Tester ◽  
The Impact

This paper study the effective toughening of polymer nanocomposites in order to have a balance stiffness, strength and toughness by incorporation of EVA as impact modifier and organoclay as a filler. In this research, rubber toughened PA6/HDPE blends nanocomposites were blended with 1 to 5 phr of ethylene vinyl acetate (EVA) with incorporation of 5wt% organoclay (MMT) in the presence of HDPE-g-MAH as compatibilizer. The mechanical properties of the samples such as tensile test and tensile modulus were measured by universal tensile machine whiles impact strength and hardness was measured using Izod Impact Tester and Rockwell hardness tester. The composites were characterized by Fourier Transform Infrared (FTIR) spectrophotometer and Thermogravimetric Analyzer (TGA). The results exhibited enhancement of mechanical properties with incorporation of 1 phr EVA but slightly decreased for further addition of EVA content. FTIR analysis showed that both samples with and without EVA presented almost the same trend. TGA stability exhibit samples containing EVA showed lower stability than sample with EVA. Conversely, addition of EVA greatly increases the impact strength as well as improved the toughness of the composites.

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