Study of thermal stability and degradation kinetics of polyurethane–ureas by thermogravimetry

Askari, Fahimeh; Barikani, Mehdi; Barmar, Mohammad; Shokrolahi, Fatemeh; Vafayan, Mehdy

doi:10.1007/s13726-015-0367-7

Cited by 19 publications

(15 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the FTIR spectra (see Fig. 2a, b) there is no absorption band at the 2270 cm −1 related to NCO groups and also at 3300-3500 cm −1 corresponding to OH groups, and thus it can be concluded that the components are completely reacted [23,24]. At the wavenumber range from 3380 to 3230 cm −1 , there are the -NH stretching vibrations of the urethane group in the area of hydrogen bonds [25].…”

Section: Ftirmentioning

confidence: 91%

“…A detailed description of the degradation processes is provided by thermogravimetric analysis (TGA) coupled with Fourier transform infrared spectroscopy (FTIR). An unquestionable advantage of this technique is the possibility of continuous monitoring of degradation products by infrared spectrums registration [23,38] TGA-FTIR analysis provides both qualitative and quantitative information on the released volatile decomposition products, and also informs about the change in sample mass as a function of time and temperature [34,39,40]. The combination of both techniques allows for a more precise interpretation of the processes mechanisms occurring during materials decomposition rather than conducting separate analyzes [38,41].…”

Section: Thermal Properties Figures 4 and 5 Show Tg And Dtg Thermogramentioning

confidence: 99%

See 1 more Smart Citation

Investigation of Thermoplastic Polyurethanes Synthesized via Two Different Prepolymers

2019

View full text Add to dashboard Cite

The man aim of this work was to investigate the effect of the molecular weight of polyols, mixture of prepolymers, and [NCO]/[OH] molar ratio used during the prepolymer chain extending step on the chemical structure, thermomechanical and mechanical properties, and thermal stability of thermoplastic poly(ether-urethane)s In this work thermoplastic poly(etherurethane)s were synthesized by using polyols with a various molecular weight, 4,4′-diphenylmethane diisocyanate and biobased glycol. Materials were obtained by a two-step method. The tests were carried out for polyurethanes obtained from a mixture of prepolymers and for reference samples. In the case of materials obtained with using mixture of prepolymers, the ratio of both prepolymers was determined on 50/50 weight percent. Soft segments of materials prepared with using mixture consist of two different polyols. The chemical structure was analyzed using FTIR 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. The thermal degradation behavior was investigated by using thermogravimetric analysis at heating rates of 10 °C/ min. It was confirmed that the mixture of prepolymers has an effect of the degree of phase separation, thermal stability and selected properties of synthesized thermoplastic poly(ether-urethane)s.

show abstract

Section: Ftirmentioning

confidence: 91%

Section: Thermal Properties Figures 4 and 5 Show Tg And Dtg Thermogramentioning

confidence: 99%

Investigation of Thermoplastic Polyurethanes Synthesized via Two Different Prepolymers

2019

View full text Add to dashboard Cite

show abstract

“…⁠In the case of PUs, the main aim is to produce bio‐polyol or bio‐isocyanate. For the synthesis of polyols chemically modified plant oils for example linseed oil , sunflower oil , palm oil , cotton oil , soybean oil , tung oil , castrol oil ⁠ hempseed oil ,⁠ corn oil , canola oil are used. Plant oils are mixtures composed of esters of glycerin, saturated acids (e.g., stearic and palmitic acid) and unsaturated fatty acids (e.g., linolenic, linoleic, oleic acid).…”

Section: Bio‐based Raw Materialsmentioning

confidence: 99%

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

Datta

Kasprzyk

2017

Polymer Engineering & Sci

120

View full text Add to dashboard Cite

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.

show abstract

“…While, higher amount of COD in PU15 and PU20 increased the T d 1 to higher temperatures. Previous works showed that increase in the hard segments content reduces maximum decomposition rate temperature of urethane bonds as they form weaker urethane bonds . Thus, we can find out that COD segments have great impact on T d 1 .…”

Section: Resultsmentioning

confidence: 64%

Effect of nano‐silica on gas permeation properties of polyether‐based polyurethane membrane in the presence of esterified canola oil diol as a nucleation agent for hard segments

Karimi

Khanbabaei²,

Sadeghi

et al. 2017

J of Applied Polymer Sci

View full text Add to dashboard Cite

In this research esterified canola oil diol (COD) was used to synthesize a green thermoplastic polyurethane. The mixture of synthesized COD as a polyester and polytetramethylene‐glycol as a polyether with different molar ratios were used to synthesize a thermoplastic polyurethane. Membranes were prepared by solution casting technique and nano‐silica particles were used to improve their gas separation performance. The effects of COD segments on phase separation and thermal properties of blocky segments of polyurethanes were evaluated using Fourier transform infrared spectroscopy and thermal gravimetric analysis. Results showed that phase separation behavior of the synthesized polyurethane was significantly increased with COD content. The COD segments showed high tendency to interact with hard segments of polyurethane in a way that new domains with higher thermal stability is created. Permeability of pure CO2, CH4, N2, and He gases were taken using constant pressure method at different pressures. Nano‐silica particles showed high inclination to interact with COD segments and significantly influenced the phase separation as well as gas permeation properties of polyurethane. Interactions of nano‐silica particles with the soft segments of polyurethane increased the glassy behavior of polymer and improved the CO2/CH4, CO2/N2, and CO2/He ideal selectivities (permselectivities). © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 45979.

show abstract

Study of thermal stability and degradation kinetics of polyurethane–ureas by thermogravimetry

Cited by 19 publications

References 28 publications

Investigation of Thermoplastic Polyurethanes Synthesized via Two Different Prepolymers

Investigation of Thermoplastic Polyurethanes Synthesized via Two Different Prepolymers

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

Effect of nano‐silica on gas permeation properties of polyether‐based polyurethane membrane in the presence of esterified canola oil diol as a nucleation agent for hard segments

Contact Info

Product

Resources

About