Primary thermal degradation effects on the polyurethane film

Sui, Heliang; Ju, Xin; Liu, Xueyong; Cheng, Kemei; Luo, Yiwei; Zhong, Fachun

doi:10.1016/j.polymdegradstab.2013.11.021

Cited by 38 publications

(20 citation statements)

References 30 publications

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“…It is because the urethane groups with the low thermal stability have been degraded when buried in soil, which was demonstrated by the FTIR results. Sui et al . studied in detail the products and mechanism of PU thermal degradation at 175 °C with the time‐dependent IR spectra, and the results demonstrated that the PU break up into isocyanate and polyols and simultaneously degrade to produce secondary amine and CO 2 at this temperature.…”

Section: Resultsmentioning

confidence: 99%

“…But the degradation extent and mechanism of PU from liquefied biomass is unknown and not reported in the literature. Although the thermal degradation and microbial degradation of PU synthesized by isocyanates and polyols were studied, environmental degradation was not involved. The mechanism of environmental degradation of PU is considerably complicated due to the presence of many substances such as water, oxygen and micro‐organisms in the environmental medium.…”

Section: Introductionmentioning

confidence: 99%

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Degradation of polyurethane coating materials from liquefied wheat straw for controlled release fertilizers

Zhang

Jia

et al. 2016

J of Applied Polymer Sci

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Polyurethane (PU) was synthesized by liquefied wheat straw and isocyanates for controlled release fertilizers (CRFs). CRFs coated by PU were buried in soil for 12 months. The degradation degree and mechanism of PU coating materials were observed by thermogravimetric analysis (TGA), Atomic Force Microscope (AFM), differential scanning calorimetry (DSC), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and Fourier transform infra-red spectroscopy (FTIR). Significant microscopic morphology of PU exhibited many small chips or stereovision holes caused by biodegradation or hydrolytic degradation due to the presence of natural polymer wheat straw. AFM results depicted the plane and height topography changes of PU before and after 12 months burial time, showing the swelling morphology of buried PU. TGA and FTIR results confirmed the disintegration of PU polymer due to the presence of isocyanates monomers in the PU12. XPS revealed an accumulation of biofilm on the surface of buried PU, providing the evidence of biodegradation mechanism. Pot experiment indicated the resin residual coating has a positive effect on soil quality.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Degradation of polyurethane coating materials from liquefied wheat straw for controlled release fertilizers

Zhang

Jia

et al. 2016

J of Applied Polymer Sci

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“…The most studied materials for the generation of isocyanates during thermal degradation are PUR and PIR foams. The thermal degradation of isocyanate-based PUR foams has been described as a two-or three-stage process (Jiao et al 2013;Allan et al 2014;Sui et al 2014;Lefebvre et al 2004;Woolley 1972), see Fig. 1.…”

Section: Isocyanate Generation During Thermal Degradationmentioning

confidence: 99%

The role of isocyanates in fire toxicity

2016

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Isocyanates are a group of low molecular weight, highly reactive compounds with a functional isocyanate group. The main human exposure route is via inhalation of airborne isocyanates, although dermal exposure has also been reported. The inhalation of isocyanates is associated with severely adverse health effects such as asthma, inflammation in the respiratory tract and cancer. During thermal degradation of polyurethane materials, airborne isocyanates can be sampled in the fire effluent. This paper discusses the reactivity and commercial applications of isocyanates and the generation of airborne isocyanates during thermal degradation, the human health effects as well as the environmental fate of some of the most commercially important isocyanates. This is followed by a review of the generation of isocyanates from large-scale fire testing and bench-scale test methods as well as sampling techniques and derivatisation agents necessary to stabilise the isocyanates and analysis.

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“…[36,37] Mechanistic description of thermal decomposition/ degradation kinetics of PU nanocomposite powder coatings assists in optimum formulation and processing conditions for obtaining thermally stable coatings. [38] Nanoparticles can play the role of barrier protecting agents to prevent polymer chains from thermal decomposition via formation of a char layer on the top of the coatings. [39][40][41][42] Extensive research addressed enhancement of thermal stability of polymers by the addition of nanoparticles.…”

mentioning

confidence: 99%

Silane‐functionalized Al₂O₃‐modified polyurethane powder coatings: Nonisothermal degradation kinetics and mechanistic insights

Hadavand

Jouyandeh

Paran

et al. 2020

J of Applied Polymer Sci

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This work reports on nonisothermal degradation kinetics of polyurethane (PU)‐based powder coatings containing 1, 3, and 5%wt% vinyltrimethoxysilane functionalized Al2O3 (V‐Al2O3) nanoparticles. Thermogravimetric analysis of PU/V‐Al2O3 powder coatings with different V‐Al2O3 contents has been performed at different heating rates. Variation of activation energy (Ea) of PU/V‐Al2O3 powder coatings was modeled as a function of partial mass loss by using Kissinger–Akahira–Sunose, Ozawa–Wall–Flynn and modified Coats–Redfern isoconversional approaches. The results revealed hindered decomposition process of PU/V‐Al2O3 nanocomposite powder coatings, featured by an increase in activation energy of degradation from ∼158 for blank PU to 225, 183, and 229 kJ/mol for nanocomposites filled with 1, 3, and 5 wt% of V‐Al2O3, respectively. Likewise, pre‐exponential factor values increased for samples containing V‐Al2O3 nanoparticles compared to that of blank sample. Sestak–Berggren kinetic model appropriately captured thermal degradation behavior of PU/V‐Al2O3 nanocomposites than that of nth order decomposition kinetic reaction models.

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Primary thermal degradation effects on the polyurethane film

Cited by 38 publications

References 30 publications

Degradation of polyurethane coating materials from liquefied wheat straw for controlled release fertilizers

Degradation of polyurethane coating materials from liquefied wheat straw for controlled release fertilizers

The role of isocyanates in fire toxicity

Silane‐functionalized Al₂O₃‐modified polyurethane powder coatings: Nonisothermal degradation kinetics and mechanistic insights

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Primary thermal degradation effects on the polyurethane film

Cited by 38 publications

References 30 publications

Degradation of polyurethane coating materials from liquefied wheat straw for controlled release fertilizers

Degradation of polyurethane coating materials from liquefied wheat straw for controlled release fertilizers

The role of isocyanates in fire toxicity

Silane‐functionalized Al2O3‐modified polyurethane powder coatings: Nonisothermal degradation kinetics and mechanistic insights

Contact Info

Product

Resources

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Silane‐functionalized Al₂O₃‐modified polyurethane powder coatings: Nonisothermal degradation kinetics and mechanistic insights