Study on degradation of a commercial rigid polyurethane foam used for fillingof process gas equipment.

Singh, Dhiraj; Chen, N.; Lorenzo-Martín, Cinta; Routbort, J.L.; Pagilla, Krishna; Urgan-Demirtas, M.; Reddy, K. Suresh Kumar; Gangathulasi, Janardhanan; Cul, G. D. Del; Simmons, Cari; Icenhour, A.S.

doi:10.2172/895663

Cited by 3 publications

(5 citation statements)

References 31 publications

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“…It is however, interesting to note that, while commercial PU foams in the similar density domain (49.6 kg/m 3 ) have been reported to have mean compressive strength of 0.21 MPa (31 psi); the biofoams and biofoam composites developed in this study registered average compressive strengths of 1.59 MPa at 55 kg/m 3 and 2.13 MPa at 59.6 kg/m 3 . The comprehensive study carried out at Oak Ridge National Laboratory in 2006, reported that even at much higher density (112.1 kg/m 3 ), the commercial PU foams demonstrated compressive strength of 2.07 MPa . Another recent study on mechanical performance of commercial PU foam reported that at a foam density of 80 kg/m 3 , the mean compressive strength was 0.60 MPa, lower than the strengths obtained in our study.…”

Section: Resultsmentioning

confidence: 51%

Bio‐based engineered nanocomposite foam with enhanced mechanical and thermal barrier properties

Kadam

Bandyopadhyay‐Ghosh

Malik

et al. 2018

J of Applied Polymer Sci

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Bio-based polyurethane (PU) foams were developed from bio-polyol (castor oil-based) in the presence of selective catalyst, surfactant, and blowing agent. Bentonite nanoclay (NC) was incorporated into the bio-polyol mixture as nano-reinforcement, while, triethyl phosphate was used as flame-retardant agent. After fabrication, these bioengineered foam nano-composites were studied for microstructural, mechanical and thermal characterizations. Fourier transform infrared spectroscopy analysis indicated the presence of characteristic functionalities within biopolyol segments, which was influenced by reactant activity within the polyurethane (PU) foams. Scanning electron microscopy revealed the cellular morphology of the foam. Thermogravimetric analysis enabled the study of foam decomposition behavior for different sample compositions. Incorporation of NC into pristine foam was found to delay the onset degradation temperature. Flammability studies depicted significant enhancement of flame retardancy with incorporation of NC up to a certain loading level. Compression tests demonstrated that significant improvement of compressive strength properties of foams could be achieved by incorporating bentonite nanoclay, owing to nucleation effect of nanoclay and corresponding enhanced structural integrity.

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Section: Resultsmentioning

confidence: 51%

Bio‐based engineered nanocomposite foam with enhanced mechanical and thermal barrier properties

Kadam

Bandyopadhyay‐Ghosh

Malik

et al. 2018

J of Applied Polymer Sci

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“…From these results, it can be concluded that there is no biodeterioration of PU foam due to microbial activity in the accelerated shortterm reactors under anaerobic conditions. Furthermore, based on the detailed investigations on aging behavior of PU foam (details not shown), the tested PU material was also mechanically and physically stable when exposed to extreme degradation conditions [21]. Those results can be summarized as follows: (1) No thermal aging characterized by compressive strengths' changes was observed at 90 C for 60-day period in both air and water environments.…”

Section: Accelerated Bioreactor Studiesmentioning

confidence: 79%

“…The measured mean annual earth temperature for Tennessee soil at 90 ft depth where PU will be used as a barrier material was around 13 C [21]. The temperature increase in the landfill designed for the disposal of pipes and equipments contaminated with radionuclides is not likely to be as much as landfills designed for the disposal of municipal waste rich in organic nutrients.…”

Section: Characteristics Of Landfill Areamentioning

confidence: 99%

“…To ascertain what degradation mechanisms could affect the foam, the PU foam was exposed to harsh conditions not likely to be experienced in real applications in a landfill. The effects of various conditions such as mechanical stresses, heat, moisture, temperature cycling, biodegradation, and radiation exposure on the aging and potential degradation of PU were studied to determine the applicability of the PU foam material as a contaminant barrier in the landfill environment [21]. However, in this paper, only the results from the lab-scale biodegradation studies conducted to determine whether PU is bioavailable to soil microorganisms are discussed.…”

Section: Introductionmentioning

confidence: 99%

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Laboratory investigation of biodegradability of a polyurethane foam under anaerobic conditions

Urgun‐Demirtas

Singh

Pagilla

2007

Polymer Degradation and Stability

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“…Due to lightweight of both materials, it is very suitable to combat ground settlement problem [13]. Several reports have appeared in the literature on the susceptibility of PU to fungal attack [14][15][16][17][18]. These studies revealed that polyether PU is moderately resistant to fungal and microbial.…”

Section: Introductionmentioning

confidence: 99%

Uplift and Settlement Prediction Model of Marine Clay Soil e Integrated with Polyurethane Foam

et al. 2019

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Polyurethane (PU) foam is a lightweight material that can be used efficiently as a ground improvement method in solving excessive and differential settlement of soil foundation mainly for infrastructures such as road, highway and parking spaces. The ground improvement method is done by excavation and removal of soft soil at shallow depth and replacement with lightweight PU foam slab. This study is done to simulate the model of marine clay soil integrated with polyurethane foam using finite element method (FEM) PLAXIS 2D for prediction of settlement behavior and uplift effect due to polyurethane foam mitigation method. Model of soft clay foundation stabilized with PU foam slab with variation in thickness and overburden loads were analyzed. Results from FEM exhibited the same trend as the results of the analytical method whereby PU foam has successfully reduced the amount of settlement significantly. With the increase in PU foam thickness, the settlement is reduced, nonetheless the uplift pressure starts to increase beyond the line of effective thickness. PU foam design chart has been produced for practical application in order to adopt the effective thickness of PU foam within tolerable settlement value and uplift pressure with respect to different overburden loads for ground improvement works.

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Study on degradation of a commercial rigid polyurethane foam used for fillingof process gas equipment.

Cited by 3 publications

References 31 publications

Bio‐based engineered nanocomposite foam with enhanced mechanical and thermal barrier properties

Bio‐based engineered nanocomposite foam with enhanced mechanical and thermal barrier properties

Laboratory investigation of biodegradability of a polyurethane foam under anaerobic conditions

Uplift and Settlement Prediction Model of Marine Clay Soil e Integrated with Polyurethane Foam

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