Surface Bonding Is Stronger for Poly(methyl methacrylate) than for Poly(vinyl acetate)

Mortazavian, Hamid; Fennell, Christopher J.; Blum, Frank D.

doi:10.1021/acs.macromol.6b00521

Cited by 35 publications

(55 citation statements)

References 68 publications

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“…Mujtaba et al proposed that polymer segments adsorbed in the concave area near the nanoparticle contacts can be strongly confined and exhibit high stiffness. Methacrylate esters are strongly anchoring chain moieties and glycol chain units were reported to successfully form bound polymer layer with a thickness in the order of several nanometers on inorganic NPs containing ─OH surface groups . Thus attractive interaction is expected in our system as well.…”

Section: Resultsmentioning

confidence: 87%

Translation of segment scale stiffening into macroscale reinforcement in polymer nanocomposites

Zbončák

Ondreáš

Uhlíř

et al. 2019

Polymer Engineering & Sci

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Structuring of polymer nanocomposites (PNCs) with an aid of relatively weak external magnetic fields has been studied as a method for control of the nano‐ and microstructure. Magnetic nanoparticles (NPs) were assembled into high aspect ratio one‐dimensional strings and unidirectionally oriented with the magnetic field (B = 0–50 mT) within the photopolymer matrix. The effect of the anisotropic MNPs assemblies on the mechanical properties was studied over a wide temperature range for the first time. The impact of various reinforcing mechanisms was distinguished with respect to the position of the glass transition temperature (Tg). The reinforcing effect exhibits temperature dependency with a maximum ~65°C above the glass transition and only negligible effect below the Tg. In addition, significant directional anisotropy of stiffness was observed. Composite micromechanics was applied to interpret the orientation and size‐dependent reinforcement of PNCs, and temperature‐dependent stiffness of the polymer‐MNP structures was quantified. The presence of polymer chains with altered dynamics surrounding the MNPs inside the anisotropic assemblies was proposed to be an essential nanoscale mechanism mediating the stress transfer and contributing to mechanical robustness of the hybrid structures and PNCs. POLYM. ENG. SCI., 60:587–596, 2020. © 2019 Society of Plastics Engineers

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Section: Resultsmentioning

confidence: 87%

Translation of segment scale stiffening into macroscale reinforcement in polymer nanocomposites

Zbončák

Ondreáš

Uhlíř

et al. 2019

Polymer Engineering & Sci

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“…Dewetting occurs very slowly in this system, potentially due to a change in the polymer's T g in the vicinity of a surface, as interfaces and confinement can impact these temperatures. 7,56 Importantly, we show that the poly(styrene-co-butadiene) thin films on mica appear to be in metastable equilibrium and dewet the mica surface very slowly.…”

Section: Concentration Effectsmentioning

confidence: 75%

“…5 However, the understanding of how these polymers interact with surfaces on the nanoscale is incomplete. It is well documented that polymers behave differently in the bulk than at an interface, [6][7][8] although the drivers for these behaviour changes remain under investigation. A greater understanding of how polymers behave in the vicinity of a surface at a fundamental level is essential to promote the intelligent design of composite materials and polymers at interfaces.…”

Section: Introductionmentioning

confidence: 99%

Poly(styrene-co-butadiene) random copolymer thin films and nanostructures on a mica surface: morphology and contact angles of nanodroplets

et al. 2017

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The self-assembly of poly(styrene-co-butadiene) random copolymers on mica surfaces was studied by varying solution concentrations and polymer molecular weights. Toluene solutions of the poly(styrene-co-butadiene) samples were spin coated onto a mica surface and the resulting polymer morphology was investigated by atomic force microscopy. At higher concentrations, thin films formed with varying thicknesses; some dewetting was observed which depended on the molecular weight. Total dewetting did not occur despite the polymer's low glass transition temperature. Instead, partial dewetting was observed suggesting that the polymer was in a metastable equilibrium state. At lower concentrations, spherical cap shaped nanodroplets formed with varying sizes from single polymer chains to aggregates containing millions of chains. As the molecular weight was increased, fewer aggregates were observed on the surface, albeit with larger sizes resulting from increased solution viscosities and more chain entanglements at higher molecular weights. The contact angles of the nanodroplets were shown to be size dependent. A minimum contact angle occurs for droplets with radii of 100-250 nm at each molecular weight. Droplets smaller than 100 nm showed a sharp increase in contact angle; attributed to an increase in the elastic modulus of the droplets, in addition, to a positive line tension value. Droplets larger than 250 nm also showed an increased contact angle due to surface heterogeneities which cannot be avoided for larger droplets. This increase in contact angle plateaus as the droplet size reaches the macroscopic scale.

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“…In silica-filled systems, hydrogen bonding can take place between the silanols present on the silica surfaces and the oxygen-containing functional groups of polymers such as PDMS, poly(methyl methacrylate), poly(vinyl acetate) or epoxy resins [ 54 , 55 , 56 , 57 , 58 , 59 ]. Polymer–filler interactions can be tuned by treating silica particles with a processing aid in order to deactivate part of the silanols.…”

Section: Orientation Of Polymer Compositesmentioning

confidence: 99%

Infrared Linear Dichroism for the Analysis of Molecular Orientation in Polymers and in Polymer Composites

Bokobza

2022

Polymers

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The mechanical properties of polymeric materials are strongly affected by molecular orientation occurring under processing conditions. Infrared dichroism is particularly well suited for characterizing polymer chain orientation at a molecular level. The usefulness of this technique has been demonstrated through various applications in homopolymers, semi-crystalline polymers, copolymers, polymer blends, as well as in polymer composites. Determination of molecular orientation can be carried out in the mid- and near-infrared ranges and very small dichroic effects can be detected with the use of a photoelastic modulator. Chain orientation in polymer composites is seen to increase with the filler content in the case of a strong interface between the two phases, making possible a quantification of the degree of bonding between the host polymeric matrix and the incorporated inclusions.

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Surface Bonding Is Stronger for Poly(methyl methacrylate) than for Poly(vinyl acetate)

Cited by 35 publications

References 68 publications

Translation of segment scale stiffening into macroscale reinforcement in polymer nanocomposites

Translation of segment scale stiffening into macroscale reinforcement in polymer nanocomposites

Poly(styrene-co-butadiene) random copolymer thin films and nanostructures on a mica surface: morphology and contact angles of nanodroplets

Infrared Linear Dichroism for the Analysis of Molecular Orientation in Polymers and in Polymer Composites

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