Role of the interactions between carbonate groups on the phase separation and properties of waterborne polyurethane dispersions prepared with copolymers of polycarbonate diol

Jofre-Reche, José Antonio; García-Pacios, Vanesa; Costa, V. Da; Colera, Manuel; Martı́n-Martı́nez, José Miguel

doi:10.1016/j.porgcoat.2015.06.029

Cited by 30 publications

(12 citation statements)

References 32 publications

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“…The ATR-IR spectra of the solid WPUA films shows the absence of N C O stretching band at 2270 cm −1 , indicating complete reaction of the isocyanate groups. The ATR-IR spectra show the characteristic bands of the polyurethanes [36][37][38] On the other hand, the characteristic out-of-plane bending of styrene [22] appears at 760 and 700 cm −1 , suggesting that polymerization of styrene, promoted by the redox pair, is produced because of, apart from this monomer, only the Bis-GMA presents aromatic groups in its structure, and this can be related to the height of the band at 700 cm −1 . Furthermore, the absence of the band at 1638 cm −1 , assigned to the symmetric stretching of the double C C bond, demonstrates the efficacy of the redox system in the radical polymerization.…”

Section: Characterization Of the Solid Hybrid Polyurethane/acrylate Fmentioning

confidence: 99%

Hybrid waterborne polyurethane/acrylate dispersion synthesized with bisphenol A-glicidylmethacrylate (Bis-GMA) grafting agent

Alvarez

Fuensanta

Orozco

et al. 2018

Progress in Organic Coatings

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New hybrid waterborne polyurethane/acrylate (WPUA) dispersions were synthesized by grafting with bisphenol-A-glycidyl dimethacrylate (Bis-GMA) in order to create chemical bonds between polyurethane and polyacrylate chains. WPUAs were prepared by using prepolymer self-emulsifying method with isophorone diisocianate, poly(tetramethylene ether) glycol, dimethylolpropionic acid, and ethylenediamine in the polyurethanic part, and styrene and n-butyl acrylate in the polyacrylate portion. A redox pair system consisting of ascorbic acid and hydrogen peroxide were used as polymerization initiator. The particle size of the WPUA dispersions increased by increasing the Bis-GMA/1,4 butanediol ratio, stable dispersions of negatively charged particles were obtained, and they had low viscosity (around 1.3 mPa.s) in spite of the relatively high solids content (27 wt%). Higher thermal stability was obtained when 50 mol% of chain extension was carried out with Bis-GMA. Using Bis-GMA/BD, instead of HEMA, as grafting agent, allowed obtaining hybrid polyurethane dispersions with the lowest mean particle size and better colloidal stability. Finally, the addition of 35 wt% Bis-GMA increased noticeably the cross-cut adhesion of polyurethane/acrylate coatings to stainless steel.

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Section: Characterization Of the Solid Hybrid Polyurethane/acrylate Fmentioning

confidence: 99%

Hybrid waterborne polyurethane/acrylate dispersion synthesized with bisphenol A-glicidylmethacrylate (Bis-GMA) grafting agent

Alvarez

Fuensanta

Orozco

et al. 2018

Progress in Organic Coatings

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“…Polycarbonates-based polyols are characterized by high polarity and strong carbonate bond expecting polyurethanes with good mechanical properties and phase separation [5]. Also, more stability has been observed toward oxidative and hydrolytic biodegradation than polyesters polyols [6].…”

Section: Polycarbonatesmentioning

confidence: 99%

Castor Oil Polyurethanes as Biomaterials

Valero¹

2017

Elastomers

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Medical application of polyurethane (PU) elastomers has been contributed significantly to the quality and effectiveness of health care systems. Applications such as nasogastric catheter, sutures, wound dressing, drug delivery system, and insulation on the leads of electronics pacemakers are already in the market. Properties of polyurethanes such as thermal and chemical stability, mechanical performance, and low degradation rate make an outstanding material for that kind of application. More recently, castor oil as polyol source has been investigated due to the needs of friendly environmental sources. In this chapter, we want to approach the advances in polyurethane area from castor oil for application in medicines. A review of castor oil-based polyurethanes, chemical modification, processing techniques, and applications in tissue engineering and medical devices will be made with the objective to understand the current situation, limitations, challenges, and perspective of this type of material.

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“…Reciprocal interactions between soft segments enhance elongation at break and thus tensile strength. 69 H bond structures can strengthen intermolecular cohesion in TPU. 70 Kim et al observed that relative to polyether ester, TPU with carbonated soft segments has higher stiffness and thermostability and features a methyl side-chain that enhances its transparency and self-healing properties.…”

Section: Introductionmentioning

confidence: 98%

Thermoplastic polyurethane/CNT nanocomposites with low electromagnetic resistance property

Lee

Chen

Chuang³

et al. 2021

Journal of Composite Materials

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Multi-wall carbon nanotubes (MWCNTs) at 0.5 wt% to 2 wt% proportions were added to thermoplastic polyurethane (TPU) synthesized with polycarbonatediol (PCDL), 4,4’-methylene diphenyl diisocyanate (MDI), and 1,3-butanediol(1,3-BDO). To formulate a new TPU-MWCNT nanocomposite, the composite was melt-blended with a twin-screw extruder. To ensure the even dispersion of MWCNTs, dispersant (ethylene acrylic ester terpolymer; Lotader AX8900) of equal weight proportion to the added MWCNTs was also added during the blending process. Studies on the mechanical and thermal properties, and melt flow experiments and phase analysis of TPU-MWCNT nanocomposites, these nanocomposites exhibit higher tensile strength and elongation at break than neat TPU. TPU-MWCNT nanocomposites with higher MWCNT content possess higher glass-transition temperature (Tg), a lower melt index, and greater hardness. Relative to neat TPU, TPU-MWCNT nanocomposites exhibit favorable mechanical properties. By adding MWCNTs, the tensile strength of the nanocomposites increased from 7.59 MPa to 21.52 MPa, and Shore A hardness increased from 65 to 81. Additionally, TPU-MWCNT nanocomposites with MWCNTs had lower resistance coefficients; the resistance coefficient decreased from 4.97 × 1011 Ω/sq to 2.53 × 104 Ω/sq after adding MWCNTs, indicating a conductive polymer material. Finally, the internal structure of the TPU-MWCNT nanocomposites was examined under transmission electron microscopy. When 1.5 wt% or 2 wt% of MWCNTs and dispersant were added to TPU, the MWCNTs were evenly dispersed, with increased electrical conductivity and mechanical properties. The new material is applicable in the electronics industry as a conductive polymer with high stiffness.

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Role of the interactions between carbonate groups on the phase separation and properties of waterborne polyurethane dispersions prepared with copolymers of polycarbonate diol

Cited by 30 publications

References 32 publications

Hybrid waterborne polyurethane/acrylate dispersion synthesized with bisphenol A-glicidylmethacrylate (Bis-GMA) grafting agent

Hybrid waterborne polyurethane/acrylate dispersion synthesized with bisphenol A-glicidylmethacrylate (Bis-GMA) grafting agent

Castor Oil Polyurethanes as Biomaterials

Thermoplastic polyurethane/CNT nanocomposites with low electromagnetic resistance property

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