New Developments in Thermoplastic Polyurethanes of Variable Crystallinity: Sensitivity of Cyclic Stress-Strain Response to Chemical Structure

Prisăcariu, Cristina; Scortanu, Elena; Airinei, Anton; Agapie, Bogdan; Iurzhenko, Maksym; Mamunya, Yevgen

doi:10.1016/j.proeng.2011.04.076

Cited by 13 publications

(14 citation statements)

References 5 publications

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“…Figure shows the phase and three‐dimensional representation of height images of different PUU systems. High dissipating soft domains give dark contrast while stiffer phases appear brighter due to the different energy dissipation by the cantilever, enabling the possibility of differentiate the different domains . Analyzing the obtained images, separated microphase segregation can be observed in PCL100 system.…”

Section: Resultsmentioning

confidence: 99%

Influence of the addition of PEG into PCL‐based waterborne polyurethane‐urea dispersions and films properties

Vadillo

Larraza²,

Arbelaiz³

et al. 2019

J of Applied Polymer Sci

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In this work, segmented waterborne polyurethane‐urea (WBPUU) dispersions containing hydrophobic polycaprolactone (PCL) and hydrophilic poly(ethylene glycol) (PEG) in different molar ratios are synthesized and used for the subsequent preparation of films by casting. The molar ratio of PEG is gradually increased up to 0.20 in order to analyze the effect of low hydrophilic PEG content (from 1.7 to 7.1 wt %) on the properties of resulting dispersions and films. Regarding the dispersions, the addition of PEG results in an increase of the particle size, from 86 ± 1 in the case of pure PCL‐based system to 112 ± 15 for systems containing 7.1 wt % of PEG, as well as in the formation of a core–shell structure in the particles. Films show different behaviors depending on their PEG content. WBPUUs containing just PCL or very low content of PEG in the soft segment present higher stiffness. However, the addition of PEG in a content of 3.4 wt % or higher hinder the ability of the short‐range ordering of the hard segment, increasing the elongation at break from 842 ± 102 MPa for PCL‐based WBPUU to 1312 ± 84 MPa for the system with the highest PEG content. Systems with higher PEG content form nanoparticles with more segregated core–shell structures inducing to the film a higher hydrophilicity. Hence, the addition of PEG to a PCL‐based WBPUU allows to tune the properties of the resulting film increasing the range of application of these materials. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020, 137, 48847.

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Section: Resultsmentioning

confidence: 99%

Influence of the addition of PEG into PCL‐based waterborne polyurethane‐urea dispersions and films properties

Vadillo

Larraza²,

Arbelaiz³

et al. 2019

J of Applied Polymer Sci

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“…Prisacariu et al demonstrated that in the case of polyetherol‐based PUs greater phase separation is observed than in the case of polyesterol‐based PUs. They studied material, which were consisted of PTHF, DBDI, or MDI.…”

Section: Thermoplastic Poly(ester‐urethane)smentioning

confidence: 99%

Thermoplastic polyurethanes derived from petrochemical or renewable resources: A comprehensive review

Datta

Kasprzyk

2017

Polymer Engineering & Sci

108

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Thermoplastic polyurethanes (TPUs) materials are obtained by the reaction of polyol (ether-, ester-, and carbonate-based diols with average molecular weight in the range from 1,000 to 3,000 g/mol) with aliphatic or aromatic diisocyanates. Synthesized materials consist of the hard and soft segments which are separated in different level. All mechanical and thermal properties of TPUs depend on the chemical structure of used monomers, volume fraction, and interaction between the hard and soft segments. Presented work is the review of the synthesis and the structure-properties relationship analysis in the case of TPU. The most popular reactants used for the production of the TPUs have petrochemical-based origin.

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“…Because of the difference in polarity, that is, thermodynamical incompatibility, these segments separate into soft and hard phases. The widespread application of the PUR elastomers is the reason for extensive research carried out in the fields of novel type synthesis and structure‐properties relationship 3–5…”

Section: Introductionmentioning

confidence: 99%

Influence of silica nanofiller on the isothermal crystallization and melting of polyurethane elastomer

Blagojević

Buhin

Igrec

2012

J of Applied Polymer Sci

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In this article, isothermal crystallization kinetic of the linear hydroxyl polyester urethane (PUR), as well as influence of amorphous silica nanofiller, was investigated. With the aim to investigate the influence of filler surface modification on the crystallization process of polyurethane matrix, nonmodified silica, as well as silica modified with methacrylsilane and octylsilane, were used as fillers for PUR composite preparation. The crystallization kinetics depending on temperature of the isothermal crystallization and volume fraction of filler by using differential scanning calorimetry (DSC) were investigated. The measurements at temperatures 7, 12, and 17°C for PUR and composites with 0.5, 1, 2, and 4 vol % of filler were done. Kinetic parameters of the isothermal crystallization n and K were determined according to Avrami model. Melting of the isothermally crystallized samples was also investigated. Results of the research indicate that by increasing the isothermal crystallization temperature, the crystallization rate of the PUR soft phase decreases and that the perfection of the crystallites is improved. By addition of all fillers up to ≈1 vol %, the crystallization rate increases; however, addition of a higher amount of the filler significantly decreases the crystallization rate. It was found that surface modification can significantly affect crystallization rate and that the nucleation efficiency of silica increases in the following order: methacrylsilane‐modified silica < nonmodified silica < octylsilane‐modified silica. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013

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New Developments in Thermoplastic Polyurethanes of Variable Crystallinity: Sensitivity of Cyclic Stress-Strain Response to Chemical Structure

Cited by 13 publications

References 5 publications

Influence of the addition of PEG into PCL‐based waterborne polyurethane‐urea dispersions and films properties

Influence of the addition of PEG into PCL‐based waterborne polyurethane‐urea dispersions and films properties

Thermoplastic polyurethanes derived from petrochemical or renewable resources: A comprehensive review

Influence of silica nanofiller on the isothermal crystallization and melting of polyurethane elastomer

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