Hybrid miniemulsion photopolymerization in a continuous tubular reactor—A way to expand the characteristics of polyurethane/acrylics

Daniloska, Vesna; Tomovská, Radmila; Asúa, José M.

doi:10.1016/j.cej.2012.01.040

Cited by 45 publications

(39 citation statements)

References 59 publications

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“…This network structure would, on one hand, restrict the possibility of the PU units to form a well-segregated phase and on the other hand it would slow down the corresponding dipole moment fluctuations. Moreover, it is known that most of the PU chains forming the network have been extended during the synthesis process [9] (see scheme c in Fig. 1).…”

Section: Discussionmentioning

confidence: 99%

“…Due to the interest of these hybrid materials, studying their structure, their chemistry and also their physical properties has been the main subject of several reports [5,6,7]. In this context, the hybrid Acrylic-Polyurethane (Acrylic/PU) polymers synthesized via miniemulsion photo-polymerization have been reported to be good candidates as pressure sensitive adhesives [8,9]. With the acrylic part as the majority component and PU chains used to form a network, it has been reported that small changes in the formulation and synthesis conditions of these materials give rise to rather different adhesive properties [10].…”

Section: Introductionmentioning

confidence: 99%

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Dielectric relaxations of Acrylic-Polyurethane hybrid materials

Martínez-Rugerio

Alegría

Daniloska

et al. 2015

Polymer

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In this work we present a dielectric relaxation study of Acrilyc/Polyurethane polymers synthesized via miniemulsion photo-polymerization. Three different samples, both parts of the synthesized hybrid latex (SOL and GEL fractions) and a full acrylic sample as reference have been considered. Besides dielectric experiments using broadband Dielectric Spectroscopy (BDS) technique, complementary Differential Scanning Calorimetry measurements have been performed. The thermodynamic characterization outcomes evidence very similar characteristics of the glass transition phenomena among the investigated samples without any signature of melting/crystallization. However BDS experiments show three well resolved dielectric relaxation processes above Tg, two of them evidence marked differences among the samples. A detail study allows us to provide a molecular origin for these three dielectric relaxation processes in connection with the sample characteristics. In particular, our results show that the characterization of these hybrid Acrylic/PU by BDS can provide access to some of the structural features that would ultimately influence the adhesives properties.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Dielectric relaxations of Acrylic-Polyurethane hybrid materials

Martínez-Rugerio

Alegría

Daniloska

et al. 2015

Polymer

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“…A rapid survey of the recent literature on polyurethane-acrylic hybrid polymer showed that most of them have excellent abrasion resistance, flexibility of polyurethane and toughness, along with chemical resistance and gloss of acrylic polymers [21][22][23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and fluorescence properties of a waterborne polyurethane–acrylic hybrid polymeric dye

Ding

Liu

et al. 2016

Polym. Bull.

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A waterborne polyurethane-acrylic hybrid polymeric dye was prepared depending on soap-free emulsion polymerization method. The resulting polymeric dye composed of methyl methacrylate (MMA) monomer which was polymerized into polymethyl methacrylate (PMMA) as cores and waterborne polyurethane-based dye was synthesized by anchoring dye monomers (6-amino-2-cyclohexylbenz[de]isoquinone-1,3-dione) to polyurethane chains as shells. The average particle sizes of the hybrid polymeric dye emulsions were found to be increased with the increase in MMA contents for MMA monomers. Compared with dye monomers, the absorption intensities and fluorescence intensities of the hybrid polymeric dye were enhanced with the increase of particle sizes. This study revealed that enhanced fluorescence intensity of the hybrid polymeric dye was mainly attributed to the hindered formation of exciplexes among dye monomers and an augmented light absorption area. It was found that the fluorescence intensity of the hybrid polymeric dye was increased with increasing temperature and the trend first increased and then decreased with increase in concentration. Furthermore, the fluorescence of the hybrid polymeric dye emulsions was found to be very stable and not sensitive to the fluorescence quencher.

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“…38 To the best of the authors' knowledge, no work on The photopolymerizations were performed at room temperature in a continuous tubular reactor. 41,42 The reactor consisted of a 740 mm silicone tube (2 mm inner diameter) and seven quartz tubes connected with each other with six semi-circular silicone bends (2 mm inner diameter). Each quartz tube had a length of 400 mm, an inner diameter of 1 mm and an outer diameter of 3 mm.…”

Section: Introductionmentioning

confidence: 99%

“…A gear pump (model 305, Gilson) was used to feed the miniemulsion (that was kept under stirring at 450 rpm) to the reactor with a flow rate corresponding to a residence time of 10 min, which was enough to achieve almost complete conversion of the acrylic monomers at the reactor outlet. 41,42 Prior to being fed to the reactor, the miniemulsion was purged with nitrogen for about 30 min. The latexes were reacted under steady-state conditions.…”

Section: Introductionmentioning

confidence: 99%

MoS₂ Nanoplatelet Fillers for Enhancement of the Properties of Waterborne Pressure-Sensitive Adhesives

Daniloska

Keddie

Asúa

2014

ACS Appl. Mater. Interfaces

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Nanocomposite pressure-sensitive adhesives (PSAs) composed of polyurethane (PU)/(meth)acrylates reinforced with MoS2 nanoplatelets were prepared by blending aqueous dispersions. MoS2 crystals were exfoliated by sonication in water in the presence of poly(vinylpyrrolidone) (PVP, molecular weight of 10,000 g mol -1 ) to prepare an aqueous dispersion. Waterborne colloidal polymer particles (latex) were synthesized by miniemulsion photopolymerization in a continuous tubular reactor. The adhesive and mechanical properties from the resulting nanocomposite films were determined as the MoS2 fraction was increased. A superior balance of viscoelastic properties was achieved with 0.25 wt% loading of the MoS2 nanoplatelets, leading to a tack adhesion energy that was three times greater than for the original PSA.

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Hybrid miniemulsion photopolymerization in a continuous tubular reactor—A way to expand the characteristics of polyurethane/acrylics

Cited by 45 publications

References 59 publications

Dielectric relaxations of Acrylic-Polyurethane hybrid materials

Dielectric relaxations of Acrylic-Polyurethane hybrid materials

Synthesis and fluorescence properties of a waterborne polyurethane–acrylic hybrid polymeric dye

MoS₂ Nanoplatelet Fillers for Enhancement of the Properties of Waterborne Pressure-Sensitive Adhesives

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Hybrid miniemulsion photopolymerization in a continuous tubular reactor—A way to expand the characteristics of polyurethane/acrylics

Cited by 45 publications

References 59 publications

Dielectric relaxations of Acrylic-Polyurethane hybrid materials

Dielectric relaxations of Acrylic-Polyurethane hybrid materials

Synthesis and fluorescence properties of a waterborne polyurethane–acrylic hybrid polymeric dye

MoS2 Nanoplatelet Fillers for Enhancement of the Properties of Waterborne Pressure-Sensitive Adhesives

Contact Info

Product

Resources

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MoS₂ Nanoplatelet Fillers for Enhancement of the Properties of Waterborne Pressure-Sensitive Adhesives