On The Micro‐Phase Separation in Waterborne Polyurethanes

Princi, Elisabetta; Vicini, Silvia; Castro, Kepa; Capitani, Donatella; Proietti, Noemi; Mannina, Luisa

doi:10.1002/macp.200900013

Cited by 52 publications

(30 citation statements)

References 35 publications

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“…C O group stretching vibration band appears at different wavenumber if the C O group belongs to polyol or urethane functional groups [23]. Moreover, carbonyl group shifts to different wavenumbers if it is free or hydrogen bonded [1,11,24]. The stretching vibration bands of free and hydrogen bonded urethane C O groups appear around 1733 and 1700-1690 cm −1 , respectively [1,11].…”

Section: Properties Of Polyurethane Filmsmentioning

confidence: 99%

Relationship between reagents molar ratio and dispersion stability and film properties of waterborne polyurethanes

Santamaria‐Echart

Arbelaiz

Saralegi

et al. 2015

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Section: Properties Of Polyurethane Filmsmentioning

confidence: 99%

Relationship between reagents molar ratio and dispersion stability and film properties of waterborne polyurethanes

Santamaria‐Echart

Arbelaiz

Saralegi

et al. 2015

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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“…As a result of only a trace of TPPDA being in the polyurethane films, the characteristic absorption peaks of TPPDA do not appear in the FTIR spectra. With increasing hard segment content, the stretching vibration at 3330 cm −1 increases, which indicates that the hard segment content increases, and the hydrogen‐bonded interaction increases . Also, the width of the stretching vibration band at 1070–1170 cm −1 increases and there is a clearer peak at 1030 cm −1 , which can be attributed to the increase of COC content.…”

Section: Resultsmentioning

confidence: 93%

“…With increasing hard segment content, the stretching vibration at 3330 cm −1 increases, which indicates that the hard segment content increases, and the hydrogen-bonded interaction increases. 24,25 Also, the width of the stretching vibration band at 1070-1170 cm −1 increases and there is a clearer peak at wileyonlinelibrary.com/journal/pi 1030 cm −1 , which can be attributed to the increase of C-O-C content. The 1 H NMR spectra and the 1 H chemical shifts of the polyurethanes are shown in Fig.…”

Section: Ftir 1 H Nmr and Gpc Results For Fwpusmentioning

confidence: 97%

Preparation of waterborne polyurethane with outstanding fluorescence properties and programmable emission intensity

Tao

Han

Bao

et al. 2017

Polymer International

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The hard segment content and hydrophilic group content of a fluorescent waterborne polyurethane (FWPU) were used to optimize the polymer structure which can influence the fluorescence properties. The synthesis of FWPU was based on 2,2′‐((4‐([3,3′:6′,2″‐terpyridine]‐4′‐yl)phenyl)azanediyl)diethanol (TPPDA) as fluorophore. The structure of FWPU was characterized using Fourier transform infrared and 1H NMR spectroscopies, and the polymer molecular weight and polydispersity were measured using gel permeation chromatography. The relationship between fluorescence properties and FWPU structure was studied using luminescence spectrometry. Compared to TPPDA, the maximum emission wavelength of FWPU showed a hypsochromic shift, and the fluorescence emission intensity and quantum yield of FWPU were increased obviously. Moreover, increasing the hard segment content led to an enhancement of the fluorescence lifetime of FWPU, and to the fluorescence intensity increasing at first and then decreasing. The fluorescence emission intensity and quantum yield of FWPU were increased nearly 11 and 7 times, respectively, compared to TPPDA when the hard segment content was 65%. With an increase of hydrophilic group content, the fluorescence emission intensity of FWPU increased. The fluorescence emission intensity of FWPU exhibited a response to pH, which facilitated its employment as a fluorescence probe. FWPU with excellent solid fluorescence is very suitable for processing into optical devices, with increasing hard segment content and hydrophilic group content both enhancing the solid fluorescence emission intensity of FWPU. © 2016 Society of Chemical Industry

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“…The polyurethane dispersion in water is usually obtained by grafting anionic hydrophilic groups onto the polymer chains . The preparation of waterborne polyurethanes was initially motivated by the need to control atmospheric emission of volatile organics .…”

Section: Introductionmentioning

confidence: 99%

Influence of aqueous dispersions in place of organic solvents during the synthesis of shape memory polyurethanes on their structure and properties

Martins

Pereira

Hoehne

et al. 2016

Polymer Engineering & Sci

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In this work, the effect of synthesizing shape memory polyurethanes in aqueous dispersions instead of in organic solvents on the structure and properties of the obtained polymers was investigated. Shape memory polyurethanes based on polycaprolactone diol and isophorone diisocyanate were synthesized by two routes: (1) aqueous dispersion (PU/SM WATER ) and (2) dissolution in THF (PU/SM THF ). The samples were analyzed by infrared spectroscopy (FTIR), X-ray diffraction (XRD), static light scattering (SLS), atomic force microscopy (AFM), differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA), and mechanical tests. The aqueous dispersion method led to the production of polyurethanes with a higher degree of phase separation and a higher degree of crystallinity. The morphology of the obtained polyurethanes demonstrated that PU/SM WATER displays a structure with better defined phase separated domains. The polyurethanes exhibited similar average molar masses, soft segment glass transitions (T gs ) and mechanical properties. The lower degrees of phase separation and crystallinity of the PU/SM THF led to lower values for the shape memory properties (shape recovery ratio (R r )). The observed changes in the structure of the polyurethanes due to the replacement of organic solvent by an aqueous dispersion during their syntheses confirmed the preparation of shape memory polyurethanes with enhanced shape memory properties. POLYM. ENG. SCI.,

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On The Micro‐Phase Separation in Waterborne Polyurethanes

Cited by 52 publications

References 35 publications

Relationship between reagents molar ratio and dispersion stability and film properties of waterborne polyurethanes

Relationship between reagents molar ratio and dispersion stability and film properties of waterborne polyurethanes

Preparation of waterborne polyurethane with outstanding fluorescence properties and programmable emission intensity

Influence of aqueous dispersions in place of organic solvents during the synthesis of shape memory polyurethanes on their structure and properties

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