Preparation and properties evaluation of nonisocyanate condensation polyurethanes based on phenol sulfonic and hydroxybenzoic acids

Bakar, M.; Białkowska, A.

doi:10.1177/8756087912438881

Cited by 10 publications

(13 citation statements)

References 13 publications

(24 reference statements)

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“…Due to their versatile structure, polyurethane-based materials are used in various application fields [1][2][3]. The foamed materials are produced in quantity, both as rigid and elastic foams.…”

Section: Introductionmentioning

confidence: 99%

Effect of the Additive Fire Retardants on the Properties of Rigid Polyurethane Foams, Obtained Using Hydroxyethyl Derivatives of Oxamide and Polymeric 4,4′-diphenylmethane Diisocyanate

Zarzyka

Łukasiewicz-Czul

Pacześniak

et al. 2015

Polymer-Plastics Technology and Engineering

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The present work investigates the effect of polyol structure and physical addition of boric acid (BA) and N,N'-bis(2-hydroxyethyl)oxamide (BHEOD) on the properties of rigid polyurethane foams. The product of hydroxyalkylation of oxamide by ethylene carbonate (EC) has been used as a polyol component. The new polyol has been foamed using polymeric 4,4'-diphenylmethane diisocyanate (MDI), water and triethylamine (TEA). In order to decrease the flammability of the foams, BA and BHEOD were employed as the additive flame retardants. It has been found, that chemical modification of the foam structure by means of oxamide groups decreases their flammability only to a small extent, whereas physical addition of BHEOD does not influence the flammability. However, the addition of BA to the foam composition resulted in a distinct decrease of foam flammability, according to the amount of BA added. All the foams, modified and non-modified by boron, have been categorized into flammability class HF-1, according to the applicable standard.The introduction of flame retardants had its impact on the properties of polyurethane foams obtained, as described in this work.

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Section: Introductionmentioning

confidence: 99%

Effect of the Additive Fire Retardants on the Properties of Rigid Polyurethane Foams, Obtained Using Hydroxyethyl Derivatives of Oxamide and Polymeric 4,4′-diphenylmethane Diisocyanate

Zarzyka

Łukasiewicz-Czul

Pacześniak

et al. 2015

Polymer-Plastics Technology and Engineering

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“…DSC analysis was performed to determine the temperatures corresponding to the physical phase transitions, which explain the phenomena that occur in the analysed materials . The thermograms obtained in the first heating cycle for all materials are shown in Figs (a) and 3(b).…”

Section: Resultsmentioning

confidence: 99%

Production and characterization of ureaurethane elastomers with rapeseed‐based polyol

Mizera

Ryszkowska

Kurańska

et al. 2018

Polymer International

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The purpose of this study was to evaluate the effect of rapeseed‐oil‐based (RO) polyol on the thermal and mechanical properties of tested ureaurethane elastomers (EPUUs). The chemical structure and degree of phase separation connected to the value of hydrogen bonds were tested by infrared spectroscopy. Thermal degradation was examined by TGA. The glass transition temperature and the enthalpy of heat effects were analysed by DSC. The mechanical properties were tested by dynamic mechanical thermal analysis and static tensile strength. The physicomechanical properties were also examined, including wear resistance and hardness of the tested materials. The use of RO polyol in 10–40 wt% concentration in polyol premixes changed the chemical structure of the EPUUs indicating a change in the quantity of hydrogen bonds and the degree of phase separation. DSC analysis showed that addition of the RO polyol causes an increase in the glass transition temperature of the soft phase in the EPUUs. © 2018 Society of Chemical Industry

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“…Condensation segmented NIPU was prepared by a three-step reactions according to a previously developed procedure. 11 -13 In the first step, oligooxypropylene carbamate containing flexible segments was prepared by amidation of oligomerol hydroxyl groups with ethyl urethane (the molar ratio of hydroxyl groups to ethyl urethane was 1:1.14). In the second step, oligomer containing HSs was obtained by reacting urea, phenol sulphonic acid and formaldehyde (molar ratio = 1:1:2).…”

Section: Methodsmentioning

confidence: 99%

“…Indeed, a lot of efforts have been made to use renewable resources such as vegetable oils for the synthesis of polyols that can be used for ‘greener’ PUs prepration. 8 -11 Diisocyanates, which are used as basic raw materials for the production of the conventional addition PUs, are expensive, toxic, unstable and harmful to the environment and human health. The elimination of these materials and their replacement by natural and chemically stable compounds lead to the preparation of biodegradable, safe and environmentally friendly polymers.…”

Section: Introductionmentioning

confidence: 99%

Effect of hard segments content on the properties, structure and biodegradation of nonisocyanate polyurethane

Białkowska

Mucha

Przybyłek

et al. 2018

Polymers and Polymer Composites

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The present study investigates the biodegradation of synthesized condensation nonisocyanate polyurethanes (NIPUs). It was prepared by reacting phenol sulphonic acid and oligooxypropylene diol and formaldehyde and contained different amounts of hard segments (HSs). Polyurethane samples were submitted to biodegradation with microorganisms R-14 and in garden soil. The tensile strength (TS), relative elongation at break and weight loss of the prepared samples were evaluated and their structure and morphology analysed. It was found that maximum decrease of the TS of all tested NIPU samples occurred only after 7 days of biodegradation. Maximum TS decrease attained was approximately 70% and 75%, respectively, for NIPU based on 0.8-mol and 1-mol HS. Moreover, significant decrease of relative elongation at break and weight loss values after biodegradation in culture R-14 for NIPU samples based on 0.9-mol HS and 1-mol HS was observed. Fourier transform infrared and scanning electron microscopic results confirmed that biodegradation occurred in urea or urethane groups. The glass transition of HSs decreased by at least 20°C due to biodegradation, suggesting that this later took place almost only in the crystalline region of NIPU samples.

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Preparation and properties evaluation of nonisocyanate condensation polyurethanes based on phenol sulfonic and hydroxybenzoic acids

Cited by 10 publications

References 13 publications

Effect of the Additive Fire Retardants on the Properties of Rigid Polyurethane Foams, Obtained Using Hydroxyethyl Derivatives of Oxamide and Polymeric 4,4′-diphenylmethane Diisocyanate

Effect of the Additive Fire Retardants on the Properties of Rigid Polyurethane Foams, Obtained Using Hydroxyethyl Derivatives of Oxamide and Polymeric 4,4′-diphenylmethane Diisocyanate

Production and characterization of ureaurethane elastomers with rapeseed‐based polyol

Effect of hard segments content on the properties, structure and biodegradation of nonisocyanate polyurethane

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