Rheological approach to select most suitable associative thickener for water-based polymer dispersions and paints

Bhavsar, Ritesh; Nehete, Kirankumar M.

doi:10.1007/s11998-019-00194-6

Cited by 19 publications

(22 citation statements)

References 16 publications

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“…With the strict regulatory restrictions of volatile organic compounds (VOC) and the consumer preferences for environmentally friendly products, waterborne technology is in demand nowadays. Associative polymers are among the major rheology additives used in waterborne paints. − Their amphiphilic structure allows their solubility in water and the formation of a transient network thanks to interactions of their hydrophobic groups, either with emulsion particles or between themselves . The hydrophobic groups can be randomly attached to the hydrophilic backbone, leading to comblike polymers such as hydrophobically modified hydroxyethyl cellulose (HMHEC) and hydrophobically modified alkali soluble emulsion (HASE) .…”

Section: Introductionmentioning

confidence: 99%

From Architectures to Cutting-Edge Properties, the Blooming World of Hydrophobically Modified Ethoxylated Urethanes (HEURs)

et al. 2020

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Hydrophobically modified ethoxylated urethanes (HEURs) are associative polymers that, compare to others, are far less sensitive to solution parameters, especially pH and ionic strength. Therefore, they are widely used as rheology modifiers in many different waterborne systems such as inks, coatings, emulsions, etc. In solutions, HEURs form transient networks through molecular associations between their hydrophobic groups. The transient network formation and its characteristics are responsible for the rheological properties and depend on the HEUR chains architecture. Many parameters such as molecular weight, size and nature of hydrophobic groups, polymer concentration, etc must be controlled to tune the several physicochemical properties of HEUR solutions. This article aims to give an overview of the HEUR studies reported in the literature in order to highlight the structure/rheological properties relationship. The article also draws attention to new trends in HEURs with innovative architectures and stimuli-responsive properties.

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Section: Introductionmentioning

confidence: 99%

From Architectures to Cutting-Edge Properties, the Blooming World of Hydrophobically Modified Ethoxylated Urethanes (HEURs)

et al. 2020

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“…PUs are industrially crucial polymers with a range of structures and uses [24]. The acrylics PU polymer is known by a table of Newtonian rheological features [25]. Regarding the aging of the PU film, Sanchis et al [26] have shown that the PU structure plays an important role in addressing the age issue.…”

Section: Polyurethane Compositementioning

confidence: 99%

Investigating Physio-Thermo-Mechanical Properties of Polyurethane and Thermoplastics Nanocomposite in Various Applications

et al. 2021

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The effect of the soft and hard polyurethane (PU) segments caused by the hydrogen link in phase-separation kinetics was studied to investigate the morphological annealing of PU and thermoplastic polyurethane (TPU). The significance of the segmented PUs is to achieve enough stability for further applications in biomedical and environmental fields. In addition, other research focuses on widening the plastic features and adjusting the PU–polyimide ratio to create elastomer of the poly(urethane-imide). Regarding TPU- and PU-nanocomposite, numerous studies investigated the incorporation of inorganic nanofillers such as carbon or clay to incorporating TPU-nanocomposite in several applications. Additionally, the complete exfoliation was observed up to 5% and 3% of TPU–clay modified with 12 amino lauric acid and benzidine, respectively. PU-nanocomposite of 5 wt.% Cloisite®30B showed an increase in modulus and tensile strength by 110% and 160%, respectively. However, the nanocomposite PU-0.5 wt.% Carbone Nanotubes (CNTs) show an increase in the tensile modulus by 30% to 90% for blown and flat films, respectively. Coating PU influences stress-strain behavior because of the interaction between the soft segment and physical crosslinkers. The thermophysical properties of the TPU matrix have shown two glass transition temperatures (Tg’s) corresponding to the soft and the hard segment. Adding a small amount of tethered clay shifts Tg for both segments by 44 °C and 13 °C, respectively, while adding clay from 1 to 5 wt.% results in increasing the thermal stability of TPU composite from 12 to 34 °C, respectively. The differential scanning calorimetry (DSC) was used to investigate the phase structure of PU dispersion, showing an increase in thermal stability, solubility, and flexibility. Regarding the electrical properties, the maximum piezoresistivity (10 S/m) of 7.4 wt.% MWCNT was enhanced by 92.92%. The chemical structure of the PU–CNT composite has shown a degree of agglomeration under disruption of the sp2 carbon structure. However, with extended graphene loading to 5.7 wt.%, piezoresistivity could hit 10-1 S/m, less than 100 times that of PU. In addition to electrical properties, the acoustic behavior of MWCNT (0.35 wt.%)/SiO2 (0.2 wt.%)/PU has shown sound absorption of 80 dB compared to the PU foam sample. Other nanofillers, such as SiO2, TiO2, ZnO, Al2O3, were studied showing an improvement in the thermal stability of the polymer and enhancing scratch and abrasion resistance.

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“…Hydrophobically modified ethoxylated urethanes (HEURs) are widely used as rheology additives in many waterborne systems for various applications such as coatings, emulsions, ink... [1][2][3][4][5] They are telechelic polymers composed of a hydrophilic main chain of poly(ethylene glycol) (PEG) that is endfunctionalized with hydrophobic groups attached through urethane linkages. HEURs are associative polymers, which through molecular association of their hydrophobic groups, form flower-like micelles above their critical micelle concentration (CMC).…”

Section: Introductionmentioning

confidence: 99%

Synthesis of hydrophobically modified ethoxylated non-isocyanate urethanes (HENIURs) and their use as rheology additives

Quienne

Pinaud

Caillol

2022

European Polymer Journal

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Rheological approach to select most suitable associative thickener for water-based polymer dispersions and paints

Cited by 19 publications

References 16 publications

From Architectures to Cutting-Edge Properties, the Blooming World of Hydrophobically Modified Ethoxylated Urethanes (HEURs)

From Architectures to Cutting-Edge Properties, the Blooming World of Hydrophobically Modified Ethoxylated Urethanes (HEURs)

Investigating Physio-Thermo-Mechanical Properties of Polyurethane and Thermoplastics Nanocomposite in Various Applications

Synthesis of hydrophobically modified ethoxylated non-isocyanate urethanes (HENIURs) and their use as rheology additives

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