Thermal stability of poly(methyl methacrylate)/silica nano- and microcomposites as investigated by dynamic-mechanical experiments

Katsikis, Nikolaos; Zahradnik, F.; Helmschrott, Anne; Münstedt, Helmut; Vital, Andri

doi:10.1016/j.polymdegradstab.2007.08.009

Cited by 75 publications

(49 citation statements)

References 39 publications

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“…The flexural strength test, which is also called bending strength and rapture strength, shows that the lowest value of flexture obtained in group I )control) )117.78 N/m 2 ) when only PMMA resin used without addition while in group IV when silanated SiO 2 used in combination with polyester fiber shows the highest value of flexural strength )122.1480 N/m 2 ) as shown in Table 2, this may be due to the number of the microfilament in the polyester fiber and the size of each filament that act as a network to mesh the nanoparticles of SiO 2 and increase the flexural strength of the composite resin matrix and also may be due to the mixture homogeneity and even distribution of fibers ) [18][19][20][21][22] . By using ANOVA Table shows no significant differences among all groups for surface hardness test however, the highest value found in group IV )86.60) and the lowest value in group I )control group = 84.57) which show a very little difference with group III )84.88) when only polyester fiber incorporated into PMMA resin, therefore the unchanged in the surface hardness of the material may be due to the accumulation of the enforcement materials within the bulk of the specimen rather than on the surface, the results in disagreement with Hachim et al ) 11) who stated that acrylic resin hardness decreased when using polyester fiber of both 2 mm and 4 mm length this may be due to differences in fiber length and concentration used )3% by wt and 6 mm length in the present study) that leads to more fiber enforcements and more randomized distribution of them within the bulk of the specimen.…”

Section: Discussionmentioning

confidence: 96%

Comparison of Some Mechanical Properties of Silanated SiO2 and Polyester Fiber Composite Incorporation into Heat Cured Acrylic Resin.

Fatihallah

2015

Iraqi dent. j.

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Background: improving polymethylemethacrylate (PMMA) resin properties is the challenge nowadays, this can be done by adding several forms and types of nano-and micro-particles to the powder or to the monomer , the aims of the study is to investigate some mechanical properties of the acrylic resin after the addition of SiO 2 nano-particles in combination with polyester fibers. Materials and Methods: The research includes 160 samples divided into four groups, four tests investigated in the study: Transverse flexural strength, impact strength, surface hardness and surface roughness (n=10). Group I is the control (No addition), group II with the addition of SiO 2 5% by wt. nano-particles, group III in which polyester fibers 3% by wt., 6 mm length added and group IV contains a combination of SiO 2 5% by wt. nano-particles and polyester fibers 3% by wt., 6 mm length. The data analyzed by ANOVA Table and multiple comparison post hoc Tukey's tests. Results: Show that a mark increase in the impact and flexural strength when combination of 5% by wt. silanated SiO 2 and 3% by wt. and 6 mm length polyester fiber incorporated into PMMA resin; while flexural strength and surface hardness tests show that there was no significant differences among the groups after ANOVA Table inferential statistical analysis application. Surface roughness comparison among the groups revealed that group containing silanated SiO 2 only gives the highest rough surface while group containing polyester fiber only shows the lowest value of roughness. Conclusion: Within the limitation of this study, incorporation of silanated SiO 2 and polyester fiber combinations in a significant weight and fiber length lead to enhancement in the impact and flexural strength of PMMA resins and with no or little effect on the surface hardness and roughness properties.

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Section: Discussionmentioning

confidence: 96%

Comparison of Some Mechanical Properties of Silanated SiO2 and Polyester Fiber Composite Incorporation into Heat Cured Acrylic Resin.

Fatihallah

2015

Iraqi dent. j.

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“…The most important factor in thermal stability, which has been produced by nano particles, is the forming of a char layer that is non-burning; ultimately, the high specifi c surface area and proper coverage of the char layer affects thermal stability (Khosravian, 2010). Moreover, an increasing of thermal stability may be the result of an increasing of interaction between the polymer matrix, wood fl our, and nanosilica (Katsikis et al, 2007). Under the effect of the addition of mineral material, the motion of the polymer chain reduced.…”

Section: Thermogravimetric Analysismentioning

confidence: 99%

Effect of Nanosilica on Thermal, Flammability, and Morphological Properties of Wf/RPS-Based Nanocomposites

Kiaei

Amiri

Ahmad

et al. 2018

CERNE

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KIAEI, M.; AMIRI, H.; SAMARIHA, A.; AMANI, N. Effect of nanosilica on thermal, flammability, and morphological properties of WF/rPS-based nanocomposites. CERNE, v. 24, n. 1, p. 59-66, 2018. HIGHLIGHTSThe results showed that the addition of nanosilica increased the thermal stability of the nanocomposite.It was determined that increasing of nano particles to more than a determined level reduced the Limited oxigen index and flammability.The data from thermo gravimetric analysis (TGA) indicated the nanosilica greatly enhanced the thermal stability. ABSTRACTThe present study considered the effect of nanosilica levels on the thermal, flammability, and morphological properties of nanocomposites made of wood flour and recycled polystyrene. To do so, the recycled polystyrene (50%), wood flour (50%), nanosilica (four levels of nanosilica; 0, 2, 4 and 6 phc (parts per hundred compounds)), and maleic anhydride, grafted with polypropylene (at a constant level of 3 phc) were mixed by a twin-screw extruder; then standard experimental samples were made using a hand pressing method. Next, the thermal and flammability properties were measured. The results showed that increasing of nanosilica content to 6 phc by weight increased thermogravimetric analysis (TGA) of nanocomposites; in addition, the limited oxygen index increased. Moreover, scanning electron microscopy (SEM) indicated that an increasing of nanosilica increased compatibility so that better link and adherence was observed among the fiber and matrix material.

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“…This is the temperature where the first decomposition of the polymer complex starts. The reason for this weight loss is due to the scission of the main chains at weak head-to-head linkages [31].…”

Section: Thermogravimetric Analysismentioning

confidence: 99%

Effect of ethylene carbonate in poly (methyl methacrylate)-lithium tetraborate based polymer electrolytes

Ramesh¹,

Shanti²,

Durairaj³

2011

Journal of Non-Crystalline Solids

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Thermal stability of poly(methyl methacrylate)/silica nano- and microcomposites as investigated by dynamic-mechanical experiments

Cited by 75 publications

References 39 publications

Comparison of Some Mechanical Properties of Silanated SiO2 and Polyester Fiber Composite Incorporation into Heat Cured Acrylic Resin.

Comparison of Some Mechanical Properties of Silanated SiO2 and Polyester Fiber Composite Incorporation into Heat Cured Acrylic Resin.

Effect of Nanosilica on Thermal, Flammability, and Morphological Properties of Wf/RPS-Based Nanocomposites

Effect of ethylene carbonate in poly (methyl methacrylate)-lithium tetraborate based polymer electrolytes

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