Simultaneous free radical and addition miniemulsion polymerization: Effect of the diol on the microstructure of polyurethane-acrylic pressure-sensitive adhesives

López, Aitziber; Degrandi, Elise; Canetta, Elisabetta; Keddie, Joseph L.; Creton, Costantino; Asúa, José M.

doi:10.1016/j.polymer.2011.04.053

Cited by 42 publications

(43 citation statements)

References 38 publications

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“…The use of a functional monomer that can introduce double bonds in the PU chains that subsequently can participate in the free‐radical polymerization of (meth)acrylics offers a way to produce grafted hybrids and improve the compatibility between PU and (meth)acrylics . Functional monomers containing both hydroxyl and (meth)acrylic groups are interesting because this dual functionality allows the monomers to react with the isocyanate groups during the formation of the polyurethane and with radicals during the formation of the poly(meth)acrylic chains.…”

Section: Introductionmentioning

confidence: 99%

Role of Grafting on Particle and Film Morphology and Film Properties of Zero VOC Polyurethane/Poly(meth)acrylate Hybrid Dispersions

Mehravar

Ballard

Agirre

et al. 2018

Macro Materials & Eng

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Hybrid waterborne dispersions of polyurethane (PU)/poly(meth)acrylic are widely applied in coating and adhesive products, as well as in many other applications. The synergetic performance of the two component polymers is highly dependent on the ability to control the PU and (meth)acrylic network structure. In this work, the effect of grafting and the impact of macromolecular architecture on the particle and film morphology as well as on the properties of PU/(meth)acrylic hybrid films is investigated. It is shown that with grafting, the absolute molar mass distribution (MMD) is shifted toward higher values as the low molar mass PU chains become incorporated in the (meth)acrylic polymer network. Furthermore, by using different types of functional monomers, the nature of the MMD can be altered. Using transmission electron microscopy (TEM) analysis, it is demonstrated that more homogeneous particle and film morphologies are obtained in the case of grafted hybrids. Finally, the impact of network structure on tensile strength is outlined highlighting that grafted polymer films have higher Young's modulus and strain hardening than the non‐grafted ones.

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Section: Introductionmentioning

confidence: 99%

Role of Grafting on Particle and Film Morphology and Film Properties of Zero VOC Polyurethane/Poly(meth)acrylate Hybrid Dispersions

Mehravar

Ballard

Agirre

et al. 2018

Macro Materials & Eng

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“…It also considered that crosslinking was only due to PU chains linking acrylic chains. This assumption is based on the fact that no gel was formed in the absence of the PU prepolymer, because BPA acted as a chain transfer agent 32, 41, 42. In addition, the formation of acrylic chains by free‐radical polymerization was assumed to be much faster than the addition reaction.…”

Section: Methodsmentioning

confidence: 99%

“…were used as a reference to estimate the increase of µ with the HEMA content. The reason of this increase is that in order to maintain the ratio OH/NCO constant, the concentration of BPA, which is an efficient chain transfer agent in the free‐radical polymerization,32, 41, 42 decreased with the HEMA content. The acrylic chains were assumed to have a Gaussian molecular weight distribution (MWD), with a mean µ and a standard deviation equal to 2 µ .…”

Section: Methodsmentioning

confidence: 99%

High‐Shear‐Strength Waterborne Polyurethane/Acrylic Soft Adhesives

Degrandi-Contraires

López

Reyes

et al. 2012

Macro Materials & Eng

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Urethane/acrylic hybrid latex particles are prepared by miniemulsion polymerization for an application as soft adhesives. The polymerization of the acrylic monomers and grafting of an isocyanate functionalized PU on a hydroxyl functionalized monomer (HEMA) take place simultaneously, resulting in a complex PU/acrylic network while avoiding any macroscopic phase separation. Its structure can be tuned by changing the extent of grafting and a specific model is applied to analyze the final polymer microstructure. The resulting materials have a low level of adhesion but display an exceptionally high resistance to shear. Two parameters are varied: the fraction of HEMA in the monomer composition and the diol concentration.

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“…Although this method ensures the virtually complete incorporation of NaSS to the polymer particles, the CRP agent strongly affects the microstructure of the main (co)polymer (frequently lowering its molecular weight), and hence limiting the achievable range of properties that for most applications (e.g. adhesives [25][26][27] ; coatings 1 ) require the broad molecular weight distributions and the high molecular weights obtained by free radical emulsion polymerization. In free radical emulsion polymerization, the incorporation of the NaSS to the polymer particles by copolymerization with a more hydrophobic monomer is expected to be largely controlled by the nature of the comonomer.…”

Section: Introductionmentioning

confidence: 99%

Fundamentals of chemical incorporation of ionic monomers onto polymer colloids: paving the way for surfactant-free waterborne dispersions

Bilgin

Asúa

2016

RSC Adv.

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In this article, the fundamentals of the chemical incorporation of a pH and temperature insensitive ionic monomer (sodium styrene sulfonate, NaSS) onto the polymer particles was investigated in an attempt to go beyond the current technology for production of waterborne polymer dispersion, which is based on the use of surfactants to stabilize the dispersion. The success of this approach requires to chemically incorporate the NaSS onto the polymer particles minimizing at the same time the amount of water soluble polymer. It was found that the chemical incorporation of NaSS can be improved by increasing the concentration of the comonomer in the aqueous phase, whereas functionality of the comonomer did not play any significant role. Strategies to maximize incorporation of the NaSS were proposed.

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Simultaneous free radical and addition miniemulsion polymerization: Effect of the diol on the microstructure of polyurethane-acrylic pressure-sensitive adhesives

Cited by 42 publications

References 38 publications

Role of Grafting on Particle and Film Morphology and Film Properties of Zero VOC Polyurethane/Poly(meth)acrylate Hybrid Dispersions

Role of Grafting on Particle and Film Morphology and Film Properties of Zero VOC Polyurethane/Poly(meth)acrylate Hybrid Dispersions

High‐Shear‐Strength Waterborne Polyurethane/Acrylic Soft Adhesives

Fundamentals of chemical incorporation of ionic monomers onto polymer colloids: paving the way for surfactant-free waterborne dispersions

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