Catastrophic phase inversion in region II of an ionomeric polymer–water system

Saw, L.K.; Brooks, Brian W.; Carpenter, Keith; Keight, D.V.

doi:10.1016/j.jcis.2004.06.056

Cited by 16 publications

(13 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…According to literature,20, 21 the phase‐inversion process during the production of aqueous PU dispersions follows three consecutive steps. In the initial one, the first water drops are soluble in the PU/acetone solution and therefore the viscosity is slightly reduced.…”

Section: Resultssupporting

confidence: 91%

“…Nevertheless, it should be pointed out that the fact of obtaining systems with a low‐average particle size does not necessarily mean that the dispersion is a stable colloid. Thus, in our case for DMPA concentrations lower than 0.26 mmol/g pol , the resultant systems are highly unstable as they settle within a couple of hours 20, 21…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, several processes have been developed for achieving aqueous PU dispersions 6–16. Among those synthetic methods, one of the most popular strategies is the acetone process,1, 4, 17–21 which consists of a two‐step procedure. In the first step, during the PU synthesis in acetone, hydrophilic and potentially charged groups are incorporated into the polymer backbone.…”

Section: Introductionmentioning

confidence: 99%

“…The most commonly used strategy to obtain hydrophilic PU by the acetone process is the addition of an internal emulsifier containing an acidic group [2‐ bis (hydroxymethyl) propionic acid (DMPA)]. It is widely accepted that a minimum amount of ionic group content is required for the formation of stable PU dispersions, but this value depends on many variables such as the polymer nature and the neutralization degree 2, 20, 21. The DMPA content affects the dispersion particle size and stability, but other parameters such as the PU content in acetone, the phase‐inversion temperature and the affinity toward water of the solvent used for PU synthesis also have a significant effect on the final PU dispersions.…”

Section: Introductionmentioning

confidence: 99%

“…The DMPA content affects the dispersion particle size and stability, but other parameters such as the PU content in acetone, the phase‐inversion temperature and the affinity toward water of the solvent used for PU synthesis also have a significant effect on the final PU dispersions. There are many reports in literature concerning the relationship between the nature of the dispersion and the reaction parameters 2, 17, 20, 21. However, detailed studies are seldom reported.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Waterborne polyurethane dispersions obtained by the acetone process: A study of colloidal features

Sardón

Irusta²,

Fernández‐Berridi³

et al. 2010

J of Applied Polymer Sci

View full text Add to dashboard Cite

Waterborne polyurethane (PU) dispersions were prepared from isophorone diisocyanate (IPDI), 2-bis(hydroxymethyl) propionic acid (DMPA), 1,4-butane diol (BD), poly(propylene glycol) (PPG), and triethylamine (TEA) by means of phase inversion through the acetone process. Changes in DMPA content, initial PU content in acetone, phase-inversion temperature, evaporation conditions, and solvent nature were found to have a great impact on dispersion properties. Using a DMPA concentration of 0.30 mmol/g pol , stable PU dispersions could only be obtained when the initial PU content in acetone was at least 60 wt %, and phase-inversion temperature was lower than 30 C. However, when increasing the PU content to 75 wt %, stable dispersions were obtained using DMPA concentrations three times lower. Finally, viscosity curves during the water addition step as well as a phase diagram were determined to understand the particle formation mechanism.

show abstract

Section: Resultssupporting

confidence: 91%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Waterborne polyurethane dispersions obtained by the acetone process: A study of colloidal features

Sardón

Irusta²,

Fernández‐Berridi³

et al. 2010

J of Applied Polymer Sci

View full text Add to dashboard Cite

show abstract

Secondary dispersion‐based reactive pressure‐sensitive adhesives with improved tack

Kutlug

Reck²,

Hartwig

2018

J of Applied Polymer Sci

View full text Add to dashboard Cite

Reactive pressure‐sensitive adhesives (PSA) have to meet the requirements for sufficient tack prior to crosslinking but also high shear after crosslinking. This article examines the use of secondary acrylic dispersions with reactive groups and epoxy resin dispersions for such PSA. Long‐term stable secondary PSA dispersions with high tack after film formation were obtained. Tack was dependent on the amount of carboxylic acid groups in the polymer as well as the base used for partial neutralization of the solvent‐borne copolymers. Reactive PSA were prepared by mixing a secondary dispersion with high amounts of carboxylic acid groups with an epoxy resin dispersion providing no tack. Variation of mixing ratio gave reactive PSA with sufficient tack, peel, and shear prior to crosslinking. Crosslinking of these reactive PSA at elevated temperatures led to high shear which was limited by incomplete molecular mixing of both phases. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46315.

show abstract

Ionomer‐based polyurethanes: a comparative study of properties and applications

Jaudouin

Robin

Lopez‐Cuesta

et al. 2012

Polymer International

100

View full text Add to dashboard Cite

International audiencePolyurethanes cover a large range of materials exhibiting various physical and mechanical properties making them useful in different applications such as elastomers or biomaterials, for instance. The introduction of ionic groups in the polyurethane backbone opens the way to new applications where the ionic groups can act as physical crosslinkers that greatly modify the final mechanical and thermal properties of the materials. Furthermore, the hydrophilicity of the chains can be enhanced by the presence of the ionic species, and so the materials can be processed as conventional dispersions even in a polar solvent such as water. As a consequence the applications are numerous; the main commercial outlets are focused on coatings and textiles industries where they can be used as waterproof coatings or substitutes for leather. But these materials can also be used in high-tech industries for shape memory materials, biomedical devices and biocompatible materials. This review summarizes the latest developments of this class of promising materials and provides the reader with the potentialities of these polymers in various areas

show abstract

Catastrophic phase inversion in region II of an ionomeric polymer–water system

Cited by 16 publications

References 12 publications

Waterborne polyurethane dispersions obtained by the acetone process: A study of colloidal features

Waterborne polyurethane dispersions obtained by the acetone process: A study of colloidal features

Secondary dispersion‐based reactive pressure‐sensitive adhesives with improved tack

Ionomer‐based polyurethanes: a comparative study of properties and applications

Contact Info

Product

Resources

About