Formulation, Preparation, and Characterization of Polyurethane Foams

Pinto, Moisés L.

doi:10.1021/ed8000599

Cited by 38 publications

(24 citation statements)

References 10 publications

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“…Conveniently, most PU formulations are based on prepolymers which are incorporated into a reactive mixture containing the catalyst, surfactant, and blowing agent (the 'formulated polyol,') allowing a wide range of customization options for the properties of the final foam. 1 The vast majority of polyurethane polyols are polyethers based on poly(propylene oxide) and poly(ethylene oxide), 2 .Therefore, as part of this finding, we conclude not only that a PU solution is likely to be the most practical approach. As a result of this finding, we acquired materials for preparing test samples of polyurethane foams based upon a polyether/MDI formulation common in industry.…”

Section: Findingmentioning

confidence: 68%

Heat-Iabile Foams 2021 (Project Report)

Ketusky

Marshall

2021

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Section: Findingmentioning

confidence: 68%

Heat-Iabile Foams 2021 (Project Report)

Ketusky

Marshall

2021

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“…Subsequently, requisite amount of MDI, as calculated according to the following formula was added and stirred vigorously for 30 s, after which the viscous liquid was poured into square box moulds (2 ×2 × 2 cm 3 ) and allowed to foam within. where m iso , m

_{italicH_{2} italicO}

, and m poly refer to the mass of polyisocyanate, water and polyol respectively and n eq,iso , n

_{italiceq, italicH_{2} italicO}

, and n eq,poly are the equivalent number of polyisocyanate (7.43 mmol/g), water (111.1 mmol/g) and polyol (estimated from the HN) and i NCO is the desired NCO index (1.05) maintained for the formulation 20. The polyols and foams were designated as PL and FM followed by a numerical suffix indicating the molecular weight of glycol from which it is derived.…”

Section: Methodsmentioning

confidence: 99%

Microwave assisted glycolysis of poly(ethylene terepthalate) for preparation of polyester polyols

Chaudhary

Parthasarathy

Kumar

et al. 2013

J of Applied Polymer Sci

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The generic aim of the present work is to reduce the time required for glycolytic depolymerization of PET by employing microwave irradiation instead of the conventional heating process. Glycolysis of PET was performed in the presence of glycols of different molecular weight under microwave irradiation. Experimental conditions like PET : glycol ratio, reaction time and concentration of glycerol were optimized to maximize the product yield. In the presence of ethylene glycol, bis-(hydroxyethyl) terephthalate (BHET) could be obtained in excellent yields in significantly lesser time (30 min) as compared to 8-9 h by conventional heating process. The BHET yield could further be increased by a second step glycolysis of the residual oligomers. This increased efficiency of the microwave assisted process has been attributed to the high microwave absorption capacity of glycols which results from their high loss factor. PET could also be glycolysed in the presence of higher glycols, however the reactivity of diols was found to decrease with increase in the molecular weight. The polyols obtained were reacted with aromatic diphenylmethane diisocyanate to prepare polyurethane foams, which were characterized by various techniques for determination of their physical, mechanical and structural properties. The compressive strength of the polyurethane foams was found to be inversely proportional to the molecular weight of the glycolysed polyol used for its preparation.

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“…Polymeric foams can be prepared from a number of chemistries and methods, but most common types routinely used include polyurethanes and polystyrene. 6 However, the preparation of polyurethane and polystyrene foams in a classroom environment, although not impossible, 7 does offer some practical challenges associated with exposure to toxic reactants, such as isocyanates.…”

Section: Polymeric Foamsmentioning

confidence: 99%

“…This is also true in the US system, with the introduction of the NGSS. 6 However, the preparation of polyurethane and polystyrene foams in a classroom environment, although not impossible, 7 does offer some practical challenges associated with exposure to toxic reactants, such as isocyanates.…”

Section: Introductionmentioning

confidence: 99%

Preparation of a Polymeric Foam: An Activity Designed to Increase Teachers’ Awareness of the Utility of Condensation Polymerization

Cullen

Scott

2018

J. Chem. Educ.

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The new Scottish 'Curriculum for Excellence' places a greater emphasis on the 10 societal implications of Chemistry concepts, including polymer chemistry. This has led to many Scottish secondary school teachers having little experience and background knowledge with which to satisfactorily explore the topic of polymers as they deliver the curriculum. Here we detail our development of a practical demonstration of polymer foams and its inclusion in a continuous professional development module for Scottish 15 secondary school teachers. This demonstration has now been incorporated into chemistry classrooms across Scotland as a means of exemplifying the topic of polymers.

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Formulation, Preparation, and Characterization of Polyurethane Foams

Cited by 38 publications

References 10 publications

Heat-Iabile Foams 2021 (Project Report)

Heat-Iabile Foams 2021 (Project Report)

Microwave assisted glycolysis of poly(ethylene terepthalate) for preparation of polyester polyols

Preparation of a Polymeric Foam: An Activity Designed to Increase Teachers’ Awareness of the Utility of Condensation Polymerization

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