Modeling the Microstructure of Acrylic‐Polyurethane Hybrid Polymers Synthesized by Miniemulsion Polymerization

Reyes, Yuri; López, Aitziber; Asúa, José M.

doi:10.1002/mren.201100010

Cited by 15 publications

(9 citation statements)

References 21 publications

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“…Very interesting results on the modeling of the polymer architecture inside the particle of complex PU/acrylic hybrids systems have also been reported by Lopez et al [12,30,31]. These studies assumed however that the particles were homogeneous.…”

Section: Resultsmentioning

confidence: 66%

Influence of composition on the morphology of polyurethane/acrylic latex particles and adhesive films

Degrandi-Contraires¹,

Udagama²,

McKenna³

et al. 2014

International Journal of Adhesion and Adhesives

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Polyurethane (PU)/acrylic hybrid particles with different PU contents were synthesized by miniemulsion polymerization and subsequently dried to give solid adhesive films. The morphologies of the particles and the morphologies and mechanical properties of the resulting films were investigated by Transmission electron microscopy combined with selective staining of the PU and by uniaxial tension tests. Morphological investigations showed a clear change in the particle morphology as the PU weight fraction increased. While at 5 wt% and 25 wt% PU (with respect to total organic content) the particles were relatively homogeneous and mechanical properties of the films could be readily interpreted with molecular arguments, at 50 wt% PU a core-shell structure was observed. This heterogeneous structure of the 50 wt% PU particles persisted in the films, resulting in a percolating network of the harder PU phase. The low deformability and strain at failure of the 50% PU films suggest that, unlike the adhesives with lower PU content, the relatively weak interfaces between the original latex particles dominate the mechanical properties.

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Section: Resultsmentioning

confidence: 66%

Influence of composition on the morphology of polyurethane/acrylic latex particles and adhesive films

Degrandi-Contraires¹,

Udagama²,

McKenna³

et al. 2014

International Journal of Adhesion and Adhesives

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“…However, the reference linear acrylic polymer also presents a low-q increase of intensity. This behavior can be attributed to the microstructure generated by miniemulsion polymerization, with typical sizes of 100 − 200 nm [9]. We have found that this low-q scattered intensity can be well described by a power law with exponent value of −3.6 (see dashed line in Figure 6).…”

Section: Small Angle X-ray Scatteringmentioning

confidence: 76%

“…In the literature we can find several comprehensive reports on the fabrication and chemical characterization of Acrylic-PU dispersions [5,7,8], in particular of pressure sensitive adhesives (PSA's). One of the main conclusions obtained from these reports is that the adhesive properties of PSA's materials are mostly determined by their polymer architecture [9]. Therefore, understanding the polymer architecture is of great importance for synthesizing optimal tailored adhesives.…”

Section: Introductionmentioning

confidence: 99%

Dielectric relaxation analysis of hybrid acrylic–polyurethane gels

Martínez-Rugerio

Alegría

Arbe

et al. 2016

Materials Today Communications

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In this paper we present a dielectric relaxation analysis of three Acrylic-Polyurethane gel samples in connection with their synthesis conditions. The dielectric analysis was carried out using Broadband Dielectric Spectroscopy (BDS). Additionally, Differential Scanning Calorimetry (DSC) and Small Angle X-ray Scattering (SAXS) measurements were performed. The thermodynamic characterization outcomes evidence very similar characteristics of the glass transition phenomena among the investigated samples without any signature of melting or crystallization. X-ray diffraction patterns evidence distinctive features for the three gel samples in two different regions, i.e., at high and low values of the scattering vector q. BDS measurements, identify three distinct dielectric relaxation processes above Tg. Particularly, differences in the dielectric parameters of the slowest relaxation process have been rationalized in connection with the synthesis method used. Our results show that the analysis of these Acrylic-Polyurethane gels by BDS-in combination with SAXS-provides access to characteristics of the network structure that would ultimately influence the properties of these materials.

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“…As mentioned above, the resulting product is a latex composed of a GEL fraction and a SOL fraction that coexist within each miniemulsion droplet. The GEL fraction is composed of a network of linear acrylic chains with PU chains attached to the reactive sites of the main acrylic backbone through bifunctional HEMA monomer [11]. These PU chains link the acrylic backbones together to form the reticulated structure.…”

Section: Methodsmentioning

confidence: 99%

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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Modeling the Microstructure of Acrylic‐Polyurethane Hybrid Polymers Synthesized by Miniemulsion Polymerization

Cited by 15 publications

References 21 publications

Influence of composition on the morphology of polyurethane/acrylic latex particles and adhesive films

Influence of composition on the morphology of polyurethane/acrylic latex particles and adhesive films

Dielectric relaxation analysis of hybrid acrylic–polyurethane gels

Dielectric relaxations of Acrylic-Polyurethane hybrid materials

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