Synthesis, characterization and reaction kinetics of PMMA/silver nanocomposites prepared via in situ radical polymerization

Siddiqui, Mohammad Nahid; Redhwi, Halim Hamid; Vakalopoulou, Efthymia; Tsagkalias, Ioannis S.; Ioannidou, Maria; Achilias, Dimitris S.

doi:10.1016/j.eurpolymj.2015.09.019

Cited by 39 publications

(30 citation statements)

References 40 publications

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“…Diameter of nanoparticles was obtained with the empirical equation of Siddiqui et al .

d (|, normaln normalm) = A + B λ_{m a x} + C λ_{m a x}^{2}

…”

Section: Resultsmentioning

confidence: 99%

“…The values of the parameters are: A = −653.71, B = 2.375, and C = −0.00174 with a correlation coefficient of R 2 = 0.912 . Using the maximum wavelength of absorption of AgNP in the equation, the diameter of silver nanoparticles is 27.54 nm.…”

Section: Resultsmentioning

confidence: 99%

“…In other cases ternary nanocomposites, PLA with AgNP and cellulose nanocrystals, were prepared by solvent casting or electrospining . AgNPs were added not only to PLA but also to polymers like poly(propylene) and poly (methyl methacrylate) . Nanocomposites showed good antimicrobial response also in migration of silver ions from the polymer to the medium .…”

Section: Introductionmentioning

confidence: 99%

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Enhancement of crystallinity and toughness of poly (l‐lactic acid) influenced by Ag nanoparticles processed by twin screw extruder

et al. 2016

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Poly(l‐lactic acid) nanocomposites based on silver nanoparticles (PLA/AgNP) were prepared by melt blending using a twin screw extruder. Nanocomposites at low concentrations were prepared with 0.1, 0.2, and 0.3 wt% of AgNP to enhance the crystallinity and improve the thermal and mechanical properties of PLA. AgNPs smaller than 100 nm which increased the crystallinity of PLA upon the addition were detected by UV–Vis. Crystallinty index of nanocomposites was estimated reaching a maximum of 0.52, where the AgNPs acted as heterogeneous nucleating agent which is correlated with the Ag content. The α and α′ crystals were observed by temperature modulated differential scanning calorimetry and wide angle X‐ray diffraction, thus lattice spacing of more ordered and distorted crystals were corroborated obtaining a higher fraction of α structures when a high content of nanoparticles was added. Moreover, strain at break and toughness of pure PLA were increased from 4.3% to 16.9% and 2.1 to 7.3 MJ/m3, respectively, modifying the inherent brittleness of PLA. Finally, with the obtained results a correlation was established where more disordered crystals show less resistance to deformation that lead to an enhancement of elongation at break observed in the nanocomposites. POLYM. COMPOS., 39:2368–2376, 2018. © 2016 Society of Plastics Engineers

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“…Diameter of nanoparticles was obtained with the empirical equation of Siddiqui et al .

d (|, normaln normalm) = A + B λ_{m a x} + C λ_{m a x}^{2}

…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Enhancement of crystallinity and toughness of poly (l‐lactic acid) influenced by Ag nanoparticles processed by twin screw extruder

et al. 2016

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“…Though a number of sophisticated models have For PHEMA, the propagation activation energy has been estimated by Buback et al using the pulsed laser polymerization (PLP)/size-exclusion chromatography (SEC) technique and found equal to 21.9 ± 1.5 kJ/mol [22]. Moreover, for the BPO initiator, the decomposition activation energy is equal to 143 kJ/mol [23]. Then, using the value estimated for the overall (effective) activation energy (i.e., 90.6 kJ/mol) and Equation 4, the activation energy of the termination reaction can be estimated.…”

Section: T (°C)mentioning

confidence: 99%

“…Furthermore, in order to provide values for the individual kinetic rate constants of the HEMA polymerization, we used for the initiator BPO the values reported in [23], i.e., k d = 5 × 10 16 exp(−143,000/RT) s −1 and f = 0.5. Then, from Equation 2and assuming that [I] ∼ = [I] 0 , the values of (k p0 / √ k t0 ) can be estimated and included in Table 1.…”

Section: T (°C)mentioning

confidence: 99%

Polymerization Kinetics of Poly(2-Hydroxyethyl Methacrylate) Hydrogels and Nanocomposite Materials

Achilias

Sıafaka

2017

Processes

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Hydrogels based on poly(2-hydroxyethyl methacrylate) (PHEMA) are a very important class of biomaterials with several applications mainly in tissue engineering and contacts lenses. Although the polymerization kinetics of HEMA have been investigated in the literature, the development of a model, accounting for both the chemical reaction mechanism and diffusion-controlled phenomena and valid over the whole conversion range, has not appeared so far. Moreover, research on the synthesis of nanocomposite materials based on a polymer matrix has grown rapidly recently because of the improved mechanical, thermal and physical properties provided by the polymer. In this framework, the objective of this research is twofold: to provide a kinetic model for the polymerization of HEMA with accurate estimations of the kinetic and diffusional parameters employed and to investigate the effect of adding various types and amounts of nano-additives to the polymerization rate. In the first part, experimental data are provided from Differential Scanning Calorimetry (DSC) measurements on the variation of the reaction rate with time at several polymerization temperatures. These data are used to accurately evaluate the kinetic rate constants and diffusion-controlled parameters. In the second part, nanocomposites of PHEMA are formed, and the in situ bulk radical polymerization kinetics is investigated with DSC. It was found that the inclusion of nano-montmorillonite results in a slight enhancement of the polymerization rate, while the inverse holds when adding nano-silica. These results are interpreted in terms of noncovalent interactions, such as hydrogen bonding between the monomer and polymer or the nano-additive. X-Ray Diffraction (XRD) and Fourier Transform Infra-Red (FTIR) measurements were carried out to verify the results.

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Engineering silver‐zwitterionic composite nanofiber membrane for bacterial fouling resistance

Ganesh

Kundukad

Cheng

et al. 2019

J of Applied Polymer Sci

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Bacterial attachment and fouling compromise material performance in applications ranging from marine equipment and biomedical devices to water treatment systems. For membrane‐based water treatment systems, bacterial attachment and biofilm formation decrease water purification efficiency and reduces mechanical durability of the membranes. In this work, we present a concurrent electrospinning and copolymerization approach to engineer composite nanofiber membranes comprising of silver nanoparticle containing poly(vinylidene fluoride‐co‐hexafluoropropylene) (PVDF‐HFP‐Ag) nanofibers and [copolymerized zwitterionic sulfobetaine methacrylate‐methacryl polyhedral oligomeric silsesquioxane]‐poly(methyl methacrylate) nanofibers. We characterized the surface morphology, topography, material chemistry, and wettability of the nanofiber membranes with scanning electron microscopy, atomic force microscopy, Fourier transform infrared spectroscopy, and contact angle measurements. We then challenged these nonwoven membranes with two model microbes, Gram‐negative Pseudomonas aeruginosa and Gram‐positive Staphylococcus aureus, and found that the silver‐zwitterionic composite nanofiber membrane exhibited superior bacterial fouling resistance by reducing >90% of bacterial attachment when compared to neat PVDF‐HFP and PVDF‐HFP‐Ag nanofiber membranes. This study demonstrates that concurrent electrospinning enables free‐standing nanofiber membranes with sustained bacterial fouling resistance, with potential in applications in filtration and water treatment technologies for which antifouling strategies are imperative. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47580.

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Synthesis, characterization and reaction kinetics of PMMA/silver nanocomposites prepared via in situ radical polymerization

Cited by 39 publications

References 40 publications

Enhancement of crystallinity and toughness of poly (l‐lactic acid) influenced by Ag nanoparticles processed by twin screw extruder

Enhancement of crystallinity and toughness of poly (l‐lactic acid) influenced by Ag nanoparticles processed by twin screw extruder

Polymerization Kinetics of Poly(2-Hydroxyethyl Methacrylate) Hydrogels and Nanocomposite Materials

Engineering silver‐zwitterionic composite nanofiber membrane for bacterial fouling resistance

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