Polymer-filled porous MCM-41: An effective means to design polymer-based nanocomposite

Ethylene-propylene-diene terpolymer nanocomposites has been developed using organically modified mesoporous silica nanoparticles by solution blending method. Hydrophilic mesoporous silica nanoparticles (MCM-41) of 100 nm in sizes were synthesized via a template-directed method, functionalized with trimethylchlorosilane (TMS) to produce hydrophobic silica (OS). The X-ray diffraction (XRD), transmission electron microscopy (TEM) and scanning electron microscopy (SEM) analysis suggest that OS are homogeneously dispersed in the EPDM matrix and can maintain its pore structure effectively in the nanocomposites. The EPDM/OS nanocomposite exhibits a significant improvement in mechanical and thermal properties with respect to neat EPDM. A significant increase in tensile strength (TS) approximately 200% was observed at very low wt % of organosilica content in the nanocomposite. Dynamic mechanical analysis also exhibits the improvement in storage modulus for nanocomposites. Thermogravimetric analysis shows a thermal stability enhancement by approximately 258C of EPDM nanocomposites containing 3 wt% OS when 25% weight loss was selected as point of comparison. The solvent uptakes in nanocomposites were comparable with the porous sites and free volume in EPDM matrix on OS incorporation. POLYM. COMPOS., 00:000-000, 2015.

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“…where v 0 50:34 and d s and d p are solubility parameter of solvent and polymer, respectively [45,46],…”

Section: Swelling Measurementsmentioning

confidence: 99%

Mechanical, thermo‐mechanical, thermal, and swelling properties of EPDM‐organically modified mesoporous silica nanocomposites

Acharya

Srivastava

2015

Polymer Composites

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“…[16][17][18] A few attempts have been made to use ordered mesoporous forms of silica for polymer reinforcement. [18][19][20][21][22][23][24] For instance, two dimensional MCM-41 [19,20] silica (pore size $3 nm) and three dimensional MCM-48 silica [21,22] (pore size $3 nm) were found to function as reinforcing agents in the in-situ polymerization of polyimide, poly(3-trimethoxysilypropylmethacrylate), poly(vinyl acetate) and poly(methyl Mesostructured forms of silica (denoted MSU-J) and aminopropyl-functionalized silica (denoted AP-MSU-J) with wormhole framework structures are effective reinforcing agents for a rubbery epoxy polymer. At loadings of 2.0-10 wt %, MSU-J silica with an average framework pore size of 14 nm (65 8C assembly temperature) provides superior reinforcement properties in comparison to MSU-J silica with a smaller average framework pore size of 5.3 nm (25 8C assembly temperature), even though the surface area of the larger pore mesostructure (670 m 2 g À1 ) is substantially lower than the smaller pore mesostructure (964 m 2 g À1 ).…”

Section: Introductionmentioning

confidence: 99%

Reinforcement of a Rubbery Epoxy Polymer by Mesostructured Silica and Organosilica with Wormhole Framework Structures

Sun

Pinnavaia

2008

Adv Funct Materials

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Mesostructured forms of silica (denoted MSU‐J) and aminopropyl‐functionalized silica (denoted AP‐MSU‐J) with wormhole framework structures are effective reinforcing agents for a rubbery epoxy polymer. At loadings of 2.0–10 wt %, MSU‐J silica with an average framework pore size of 14 nm (65 °C assembly temperature) provides superior reinforcement properties in comparison to MSU‐J silica with a smaller average framework pore size of 5.3 nm (25 °C assembly temperature), even though the surface area of the larger pore mesostructure (670 m2 g−1) is substantially lower than the smaller pore mesostructure (964 m2 g−1). The introduction of 5.0 and 10 mol % aminopropyl groups in the wormhole framework walls decreases the textural properties in comparison to the pure silica analogs. AP‐MSU‐J organosilicas increase the tensile strength as well as the strain‐at‐break of the rubbery epoxy mesocomposites in comparison to MSU‐J silica as a reinforcing agent. The improved toughness provided by the aminopropyl functionalized mesostructures is attributable in part to covalent bond formation between the mesostructured silica walls and the cured epoxy matrix and to a more ductile mesostructure framework in comparison to a pure silica framework. An organosilica derivative containing 20 mol % aminopropyl groups, but lacking a mesostructured framework, provides little or no improvement in polymer tensile properties, demonstrating that an ordered porous network is essential for polymer reinforcement. In general, the reinforcement benefits provided by mesostructures with larger framework pores are superior to those provided by smaller pore derivatives, most likely because of more efficient polymer impregnation of the particle mesopores. The presence of a mesostructured form of the organosilica is essential for improving the mechanical properties of the epoxy polymer.

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“…Then silica particles reinforce the polymer matrix [24 -26]. In some cases a supercritical fluid is the solvent, apparently helping the growth of the polymer into the pores [27].…”

Section: Introductionmentioning

confidence: 99%

Poly(methyl acrylate) plus Mesoporous Silica Nanohybrids: Mechanical and Thermophysical Properties

et al. 2007

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Abstract:A mesoporous silica MCM-48 is used as a reinforcement agent for poly(methyl acrylate) (PMA). Methyl acrylate is introduced into the mesoporous silica that has an interconnected porous structure, allowing monomer diffusion into the pores before the polymerization reaction. In order to improve the silica plus polymer adhesion and to decrease the silica agglomeration, the silanol groups of the silica are functionalized with methyl groups without decreasing significantly the pore size. The silica is characterized by nitrogen adsorption, scanning electronic microscopy (SEM) and infrared (IR) spectroscopy. The nanohybrids so obtained are analyzed by tensile testing, thermogravimetry (TGA), differential scanning calorimetry (DSC) and dynamical mechanical analysis (DMA). The highest improvement of mechanical and thermophysical properties is achieved for nanohybrids containing 5 wt. % mesoporous silica. At 10 % silica, agglomeration of the filler takes place and the dispersed phase is less effective in reinforcing the polymer matrix.

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Polymer-filled porous MCM-41: An effective means to design polymer-based nanocomposite

Cited by 51 publications

References 15 publications

Mechanical, thermo‐mechanical, thermal, and swelling properties of EPDM‐organically modified mesoporous silica nanocomposites

Mechanical, thermo‐mechanical, thermal, and swelling properties of EPDM‐organically modified mesoporous silica nanocomposites

Reinforcement of a Rubbery Epoxy Polymer by Mesostructured Silica and Organosilica with Wormhole Framework Structures

Poly(methyl acrylate) plus Mesoporous Silica Nanohybrids: Mechanical and Thermophysical Properties

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