Heterogeneous distribution of magnetic nanoparticles in reactive polymer blends

Wu, Guozhang; Cai, Xiaoxia; Lin, Xiaojie; Yui, Hiroshi

doi:10.1016/j.reactfunctpolym.2010.07.007

Cited by 15 publications

(8 citation statements)

References 33 publications

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“…Based on the previous study,19 the result showed that PS/PA6 form sea‐island structure where PA6 is the dispersed domain and most of Fe 3 O 4 nanoparticles are selectively located in PA6 domain. Figure 1(a,b) are the SEM image and the size distribution of PA6/Fe 3 O 4 microspheres extracted from the PS/PA6/Fe 3 O 4 /FPSblends (60/40/50/6, weight ratio).…”

Section: Resultsmentioning

confidence: 85%

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A novel approach to prepare PA6/Fe₃O₄ microspheres for protein immobilization

Cai

Zhang

2011

J of Applied Polymer Sci

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A novel method for preparation of polymerbased magnetic microspheres was proposed by utilizing melt reactive blending, which was based on selective location of Fe 3 O 4 nanoparticles in PA6 domain of polystyrene (PS)/polyamide 6 (PA6) immiscible blends. The results showed that most of Fe 3 O 4 was located in the PA6 microspheres. Magnetization data revealed the magnetite content of PA6/Fe 3 O 4 microsphere could be up to 54 wt % with strong magnetic responsibility and high saturation magnetization. Carboxyl functional group, bonded with PA6/ Fe 3 O 4 microsphere by copolymerization of acrylic acid with PA6 chain in different concentration ethanoic acid (HAc) solution, was used as a ligand for protein adsorption. The amount of adsorbed bovine serum albumin (BSA) was optimized by changing the medium pH and the initial concentrations of BSA. The results denoted that the adsorption capacity of BSA reaches 215 mg/g microspheres, showing potentials to promising applications in bioseparation and biomedical fields.

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Section: Resultsmentioning

confidence: 85%

“…The mixing procedure was as follows: precompounding PA6, FPS, and PS for 2 min and then adding Fe 3 O 4 for another 8 min. The effect of mixing protocol on the dispersed of Fe 3 O 4 in PS/PA6 blend has been detailed in our previous report 19. The mixtures were compressed into a 1mm‐thick sheet at 260°C for 15 min.…”

Section: Methodsmentioning

confidence: 99%

A novel approach to prepare PA6/Fe₃O₄ microspheres for protein immobilization

Cai

Zhang

2011

J of Applied Polymer Sci

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“…Concerning magnetic materials, a new way to obtain composite magnetic microspheres is to melt-mix magnetic nanoparticles with a binary polymer blend and then selectively extract the dispersed polymer domains in which the magnetic particles are preferentially localized. To obtained PA6/Fe 3 O 4 microspheres with regular shape and size, Wu et al [255] incorporated magnetic Fe 3 O 4 nanoparticles in FPS/PA6 blends where FPS stands for polystyrene with terminal maleic anhydride groups on the PS chain. FPS plays the role of a compatibilizer, reducing the PA6 droplet size in the blend (as explained previously) before extraction.…”

Section: Conductive and Magnetic Propertiesmentioning

confidence: 99%

Structuration, selective dispersion and compatibilizing effect of (nano)fillers in polymer blends

Taguet

Cassagnau

Lopez‐Cuesta

2014

Progress in Polymer Science

456

262

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International audienceHybrid ternary blends comprising two polymers and one mineral (nano)filler are increasingly studied because they are starting to be widely used to respond to industrial issues. The objective of this review is-to gather information on these particular systems. Concerning first thermodynamic effects of fillers on the phase separation of an immiscible polymer blend, Flory-Huggins theory demonstrate stabilization. This theory was particularly taken up and developed for the case of two polymers and one filler by Lipatov and Nesterov in the 90s. More recently, Ginzburg generalized this theory to the case of unfavorable enthalpic interactions between a particle and the two polymers. They showed that the amount of particles had to attain a certain threshold to stabilize the system and the lower the particle radius, the higher the stable zone area. Generally speaking, all the phenomena regarding the morphology of polymer blends are governed by thermodynamics and/or kinetic effects, as well as the localization of nanoparticles. The main discussed thermodynamically controlling parameter of the localization is the wetting parameter omega(AB). However, because of the viscosity of the system, the equilibrium dictated by omega(AB) may never be reached. Hence, concerning the kinetic effects, the final localization of fillers in a polymer pair is guided by the sequence of mixing of the components, the viscosity ratio, the composition, the temperature, the shear rate and the time of mixing. When the particles are placed at the interface between two polymers, coalescence can be suppressed or/and interfacial tension can be reduced. In that case, particles are known to play the role of a compatibilizer. In a ternary system, (i) the shape of the particle (spheres, rods or "onions-shape"), (ii) the particle radius (R-p) versus the radius of gyration of the polymers (R-g) and (iii) the surface chemistry of the particles affect the final localization of the particles (thus, the compatibilizing effect) and the final properties of the material, such as mechanical, conductive, magnetic and thermal properties. This review details recent works for which those four above mentioned properties are improved by incorporating different kind of fillers in polymer blends

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“…4,5 The inclusion of nanollers, such as carbon nanotubes, clay, graphene, carbon black and nanosilica, to polymer blends has gained an increasing popularity, mainly because of the value-added properties of the blend nanocomposites compared to the neat blends. [6][7][8] Addition of nanollers to immiscible polymer blends may cause morphological changes, affecting the nal properties of the material. In the literature of the blend nanocomposites, there is no consensus about the effect of nanollers on the blend morphology.…”

Section: Introductionmentioning

confidence: 99%