New approach to evaluate microphase separation in segmented polyurethanes containing carbonate macrodiol

Niemczyk, Agata; Piegat, Agnieszka; Sonseca, Águeda; Fray, Mirosława El

doi:10.1016/j.eurpolymj.2017.05.046

Cited by 88 publications

(82 citation statements)

References 29 publications

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“…The carbonyl region (1800-1600 cm −1 ) of the ATR-IR spectra of the PUUs shows that the bands of the urethane and urea groups are more intense by increasing the number of OH groups in the amino-alcohol (Figure 8b). Several C=O groups may contribute to the carbonyl band including the carbonate of the polyol (soft segment -SS), the carboxyl group of DMPA, and the urethane and urea hard segments (HS), as well as the interactions by hydrogen bond between them, i.e., hard segments-hard segment (HS-HS), hard segment-soft segment (HS-SS) and soft segment-soft segment (SS-SS) interactions ( Figure 9) [22,[24][25][26]. Because of the amounts of the DMPA and the polyol, and because the NCO/OH ratio are similar in all PUU films, the differences in the percentages of the free and associated carbonyl groups must derive from the interactions between the urethane and urea groups formed by reacting the amino-alcohol with the prepolymer during the chain extension step of the waterborne polyurethane-urea synthesis.…”

Section: Characterization Of the Puu Filmsmentioning

confidence: 99%

New Waterborne Polyurethane-Urea Synthesized with Ether-Carbonate Copolymer and Amino-Alcohol Chain Extenders with Tailored Pressure-Sensitive Adhesion Properties

et al. 2020

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New waterborne polyurethane-urea dispersions with adequate adhesion and cohesion properties have been synthesized by reacting isophorone diisocyanate, copolymer of ether and carbonate diol polyol and three amino-alcohols with different number of OH groups chain extenders using the prepolymer method. The waterborne polyurethane-urea dispersions were characterized by pH, particle-size distribution, and viscosity, and the polyurethane-urea films were characterized by attenuated total reflectance infrared (ATR-IR) spectroscopy, differential scanning calorimetry (DSC), thermal gravimetric analysis (TGA), and plate-plate rheology (temperature and frequency sweeps). Polyurethane-urea pressure-sensitive adhesives (PUU PSAs) were prepared by placing the waterborne polyurethane dispersions on polyethylene terephthalate (PET) films and they were characterized at 25 °C by creep test, tack and 180° peel test. The waterborne polyurethane-urea dispersions showed mean particle sizes between 51 and 78 nm and viscosities in the range of 58–133 mPa·s. The polyurethane-urea films showed glass transition temperatures (Tgs) lower than −64 °C, and they showed a cross of the storage and loss moduli between −8 and 68 °C depending on the number of OH groups in the amino-alcohol chain extender. Different types of PUU PSAs (removable, high shear) were obtained by changing the number of OH groups in the amino-alcohol chain extender. The tack at 25 °C of the PUU PSAs varied between 488 and 1807 kPa and the 180° peel strength values ranged between 0.4 and 6.4 N/cm, and their holding times were between 2 min and 5 days. The new PUU PSAs made with amino-alcohol chain extender seemed very promising for designing environmentally friendly waterborne PSAs with high tack and improved cohesion and adhesion property.

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Section: Characterization Of the Puu Filmsmentioning

confidence: 99%

New Waterborne Polyurethane-Urea Synthesized with Ether-Carbonate Copolymer and Amino-Alcohol Chain Extenders with Tailored Pressure-Sensitive Adhesion Properties

et al. 2020

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“…To investigate hydrogen bonding distribution and microphase separation, researchers used DSC and FTIR spectroscopy . Niemczyk et al confirmed the high influence of microphase separation, hydrogen bonding and partial crystallization of the SSs on the thermoplastic elastomeric behavior of polyurethanes. The microphase separation and H‐bonds formation between the functional groups of the hard and SSs in poly(carbonate‐urethane)s was confirmed.…”

Section: Introductionmentioning

confidence: 99%

“…The HS content varied from 35 to 41%. The authors showed that the high content of mixed phase and the physical interactions between carbonyl groups of carbonate polyol result in the highest elastic modulus of the prepared materials (41 wt% of HS) .…”

Section: Introductionmentioning

confidence: 99%

Effect of molar ratio [NCO]/[OH] groups during prepolymer chains extending step on the morphology and selected mechanical properties of final bio‐based thermoplastic poly(ether‐urethane) materials

Kasprzyk

Datta

2018

Polymer Engineering & Sci

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The main aim of this work was to investigate the effect of [NCO]/[OH] molar ratio used during the prepolymer chain extending step (with bio‐based diols) on the chemical structure, and thermomechanical and mechanical properties of thermoplastic poly(ether‐urethane)s. Thermoplastic poly(ether‐urethane)s were obtained from bio‐based polyol (polytrimethylene ether glycol), bio‐based glycol (1,4‐butanediol or 1,3‐propanediol), and 4,4'diphenylmethane diisocyanate via a prepolymer route. In the first step, the prepolymer was synthesized from a polyol and diisocyanate. In the second step, the prepared prepolymer terminated with isocyanate group had been extended by using bio‐glycol at three different [NCO]/[OH] molar ratios, namely, 0.9, 0.95, and 1.0. The chemical structure was analyzed using Fourier transform infrared spectroscopy. The Gaussian deconvolution technique was used to study the hydrogen bonding as well as to decompose carbonyl region of three peaks in various TPUs. It has been confirmed that the glycol type and [NCO]/[OH] molar ratio have an effect on the degree of phase separation, and thermomechanical and mechanical properties of resulting materials. It was also observed that the degree of microphase separation increased with increasing content of 1,3‐propanediol used as a chain extender. Materials with the highest [NCO]/[OH] ratio showed the most favorable mechanical properties. POLYM. ENG. SCI., 58:E199–E206, 2018. © 2018 Society of Plastics Engineers

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“…It is well-known that the infrared absorbance of hydrogenbonded urethane carbonyl appears at lower wavenumbers than that of free urethane carbonyl [37]. The band in the range of 1720-1730 cm −1 is associated with the stretching vibration of free carbonyl (F-CO) [38], whereas the bands with the center position at about 1695-1706 cm −1 and at about 1660 cm −1 is due to the hydrogen bonded C=O (H-CO) of the hard domains [21,39,40]. The band in the range of 1624-1656 cm −1 is associated with the H-CO groups of crystalline soft domains [37,41].…”

Section: Microphase Separation Behavior 321 the Effect Of Long Chamentioning

confidence: 95%

“…Basically, the phase separation occurs when the HSs assemble themselves via hydrogen bonding, and thus the hard domains are formed and excluded from the matrix of soft phase [47,48]. However, in the case that the SSs possess functional groups acting as acceptors which is strong enough to interact with -NH group in HSs, phase mixing is supposed to occur [40]. The possible interactions between segments in PU are illustrated in figure 5.…”

Section: Microphase Separation Behavior 321 the Effect Of Long Chamentioning

confidence: 99%

Palm kernel oil polyol based shape memory polyurethane: effect of polycaprolactone and polyethylene glycol as soft segment

Trinh

Jaafar

Viet

et al. 2020

Mater. Res. Express

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Shape memory polyurethane (SMPU) with its outstanding characteristics is categorized as smart materials and has been utilized in a wide range of applications. In this study, a series of palm kernel oil polyol (PKOp) -based SMPU with the combination of polycaprolactone (PCL) and polyethylene glycol (PEG) as soft segment was synthesized and characterized for the first time. The synthesized SMPUs were examined via several techniques such as Fourier transform infrared, x-ray diffraction, thermal analysis, tensile and shape memory test. The combination of PCL and PEG in PKOp-based SMPU has overcome the drawbacks of PKOp-based PU with only PCL or PEG as soft segment. PU-PCL4PEG4 exhibited tensile strength, Young's modulus, and shape fixity of 5.7 MPa, 53.9 MPa, and 97%, respectively. For the variation of PEG molar ratio, PU-0.6PEG demonstrated good modulus (151.3 MPa) and shape fixity (99%) but its tensile strength and tensile strain at break were compromised as compared to other samples.

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New approach to evaluate microphase separation in segmented polyurethanes containing carbonate macrodiol

Cited by 88 publications

References 29 publications

New Waterborne Polyurethane-Urea Synthesized with Ether-Carbonate Copolymer and Amino-Alcohol Chain Extenders with Tailored Pressure-Sensitive Adhesion Properties

New Waterborne Polyurethane-Urea Synthesized with Ether-Carbonate Copolymer and Amino-Alcohol Chain Extenders with Tailored Pressure-Sensitive Adhesion Properties

Effect of molar ratio [NCO]/[OH] groups during prepolymer chains extending step on the morphology and selected mechanical properties of final bio‐based thermoplastic poly(ether‐urethane) materials

Palm kernel oil polyol based shape memory polyurethane: effect of polycaprolactone and polyethylene glycol as soft segment

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