Thermal degradation of biomedical polyurethanes?A kinetic study using high-resolution thermogravimetry

Lage, Laércio Gomes; Kawano, Yoshio

doi:10.1002/1097-4628(20010131)79:5<910::aid-app150>3.0.co;2-n

Cited by 51 publications

(26 citation statements)

References 17 publications

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“…At 285 °C there is a deviation in the degradation pathway of the uncoated foam, as evidenced by a decreased rate of mass loss. Typical polyurethane degradation occurs in two or three steps . The first step is the degradation of hard segments, forming isocyanates and alcohols, primary or secondary amines and olefins, and carbon dioxide.…”

Section: Resultsmentioning

confidence: 99%

Carbon Nanotube Multilayer Nanocoatings Prevent Flame Spread on Flexible Polyurethane Foam

Holder

Cain

Plummer

et al. 2015

Macro Materials & Eng

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In an effort to protect polyurethane foam (commonly used as cushioning in upholstered furniture) from fire using environmentally benign chemistries, nanocomposite thin films are deposited using water‐based solutions of cationic‐ and anionic‐stabilized multiwalled carbon nanotubes (MWCNTs). The open‐celled foam is coated using layer‐by‐layer (LbL) assembly to produce uniform protective layers up to 600 nm thick, comprised of cationic polyethylenimine modified with pyrene (PEI‐Py), anionic poly(acrylic acid) (PAA), and MWCNT. Film thickness is found to rely heavily on the PAA‐stabilized MWCNT solution. Coatings of only six [PEI‐Py/PAA+MWCNT] bilayers (BL) show tremendous reductions in peak heat release rate (up to 67%) and total smoke release (up to 80%) for the polyurethane foam. This same coating significantly improves the performance of the polyurethane when exposed to horizontal and vertical flame tests. With 9 BL, the foam successfully withstands a vertical burn test, self‐extinguishing immediately after removal of the test flame. These dramatic reductions in foam flammability are unprecedented and are attributed to the protective nature of the carbon‐based char formed from the coating that acts as a protective barrier.

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Section: Resultsmentioning

confidence: 99%

Carbon Nanotube Multilayer Nanocoatings Prevent Flame Spread on Flexible Polyurethane Foam

Holder

Cain

Plummer

et al. 2015

Macro Materials & Eng

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“…As known, the thermal degradation of PUs occurs in a two to three-step process. [29][30][31][32][33][34] The first step is due to the degradation of the hard segment, which results in the formation of isocyanate and alcohol, primary or secondary amine and olefin, and carbon dioxide. The second and third steps are due to the thermal decomposition of the soft segment.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and thermal characterization of novel poly(azomethine-urethane)s derived from azomethine containing phenol and polyphenol species

et al. 2011

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Oligophenol-based poly(azomethine-urethane)s (PAMUs) were newly synthesized in two steps. At the first step, the prepolymers including the phenol and oligophenol based-Schiff bases were prepared by a condensation reaction of o-dianisidine with 4-hydroxybenzaldehyde/3-ethoxy-4-hydroxybenzaldehyde, and the polycondensation reactions of the corresponding Schiff bases in an aqueous alkaline media. At the second step, the PAMUs were obtained by copolymerization of the prepolymers with toluene-2,4-diisocyanate (TDI) under an argon atmosphere. The structures of the obtained compounds were confirmed by FTIR, UV-vis, 1 H NMR, and 13 C NMR, and size exclusion chromatography (SEC) techniques. The synthesized compounds were also characterized by TG-DTA and DSC analyses. Thermal decomposition steps at various temperatures were clarified by FTIR analyses of the degraded products. The physical changes to the synthesized PAMUs after exposing them to the thermal degradation steps are displayed.

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“…As shown, both the materials reveal multistep degradation mechanism. From the literature, it is obvious that the thermal degradation of polyurethanes (PUs) occurs in a two-to three-step process [18][19][20]. The first step is due to degradation of the hard segment which results in the formation of isocyanate and alcohol, primary and secondary amine and olefin, and carbon dioxide.…”

Section: Thermogravimetric and Thermal Analysismentioning

confidence: 99%

A water dispersed Titanium dioxide/poly(carbonate urethane) nanocomposite for protecting cultural heritage: Preparation and properties

D’Orazio

Grippo

2015

Progress in Organic Coatings

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Thermal degradation of biomedical polyurethanes?A kinetic study using high-resolution thermogravimetry

Cited by 51 publications

References 17 publications

Carbon Nanotube Multilayer Nanocoatings Prevent Flame Spread on Flexible Polyurethane Foam

Carbon Nanotube Multilayer Nanocoatings Prevent Flame Spread on Flexible Polyurethane Foam

Synthesis and thermal characterization of novel poly(azomethine-urethane)s derived from azomethine containing phenol and polyphenol species

A water dispersed Titanium dioxide/poly(carbonate urethane) nanocomposite for protecting cultural heritage: Preparation and properties

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