New method of synthesis of oligoetherols with carbazole ring

Lubczak, Renata

doi:10.17344/acsi.2014.1296

Cited by 3 publications

(1 citation statement)

References 14 publications

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“…The molecular mass of the oligoetherol has a more pronounced effect on the OH group reactivity than the molecular mass of oligoesterol. Polyetherols are synthesized from azacyclic compounds and oxiranes [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

The use of citric acid in the production of polyols for rigid PUR-PIR foams

Liszkowska

2016

Polym. Bull.

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The article describes the method of obtaining new, cheaper compounds which can substitute polyols in the production of rigid polyurethane-polyisocyanurate foams (PUR-PIR). Rigid PUR-PIR foams were synthesized, using newly obtained tree compounds (citrates with hydroxyl groups): obtained with using catalyst (T-2-HHT ? K), without catalyst (T-2-HHT) and (T-5-HHT). New compounds (T-2-HHT ? K, T-2-HHT, T-5-HHT) were prepared from citric acid (1 mol) and glycols, respectively: butane-1.2-diol (3 mol and excess of 30 cm 3 ), butane-1.2-diol (3 mol), pentane-1.5-diol (3 mol) by the esterification reaction in the solution. The industrial Rocopol 551, used as polyol, was gradually substituted for the new compounds in the polyol premix in new foams. The three series of rigid polyurethane-polyisocyanurate foams based on T-2-HHT ? K, T-2-HHT, T-5-HHT have been synthesized (F1-F16) and W foam without new compound. Its properties have been determined according to the standards. It has been shown that the addition of T-2-HHT ? K, T-2-HHT, T-5-HHT to the foams affects the foams' density. The influence of the abovementioned compounds on foams' flammability, thermal properties and others was examined. A decrease in foams' brittleness by 6.9 % and in oxygen index by 24 % was observed. The examined retention was in the range of 80.9-96.5 %.

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Section: Introductionmentioning

confidence: 99%

The use of citric acid in the production of polyols for rigid PUR-PIR foams

Liszkowska

2016

Polym. Bull.

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Preparation and characterization of boron-containing polyurethane foams with carbazole

et al. 2018

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A Brief Introduction to the Polyurethanes According to the Principles of Green Chemistry

Brzeska

Piotrowska-Kirschling

2021

Processes

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Polyurethanes are most often called “green” when they contain natural, renewable additives in their network or chemical structure, such as mono- and polysaccharides, oils (mainly vegetable oils), polyphenols (e.g., lignins, tannins), or various compounds derived from agro-waste white biotechnology (Principle 7). This usually results in these polyurethanes obtained from less hazardous substrates (Principle 4). Appropriate modification of polyurethanes makes them susceptible to degradation, and the use of appropriate processes allows for their recycling (Principle 10). However, this fulfilment of other principles also predisposes them to be green. As in the production of other polymer materials, the synthesis of polyurethanes is carried out with the use of catalysts (such as biocatalysts) (Principle 9) with full control of the course of the reaction (Principle 11), which allows maximization of the atomic economy (Principle 2) and an increase in energy efficiency (Principle 6) while minimizing the risk of production waste (Principle 1). Moreover, traditional substrates in the synthesis of polyurethanes can be replaced with less toxic ones (e.g., in non-isocyanate polyurethanes), which, at the same time, leads to a non-toxic product (Principle 3, Principle 5). In general, there is no need for blocking compounds to provide intermediates in the synthesis of polyurethanes (Principle 8). Reasonable storage of substrates, their transport, and the synthesis of polyurethanes guarantee the safety and the prevention of uncontrolled reactions (Principle 12). This publication is a summary of the achievements of scientists and technologists who are constantly working to create ideal polyurethanes that do not pollute the environment, and their synthesis and use are consistent with the principles of sustainable economy.

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New method of synthesis of oligoetherols with carbazole ring

Cited by 3 publications

References 14 publications

The use of citric acid in the production of polyols for rigid PUR-PIR foams

The use of citric acid in the production of polyols for rigid PUR-PIR foams

Preparation and characterization of boron-containing polyurethane foams with carbazole

A Brief Introduction to the Polyurethanes According to the Principles of Green Chemistry

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