Elaboration and Characterization of Advanced Biobased Polyurethane Foams Presenting Anisotropic Behavior

A phosphaphenanthrene groups containing soybean oil based polyol (DSBP) was synthesized by epoxidized soybean oil (ESO) and 9,10-dihydro-oxa-10-phosphaphenanthrene-10-oxide (DOPO). Soybean oil based polyol (HSBP) was synthesized by ESO and H2O. The chemical structure of DSBP and HSBP were characterized with FT-IR and 1H NMR. The corresponding rigid polyurethane foams (RPUFs) were prepared by mixing DSBP with HSBP. The results revealed apparent density and compression strength of RPUFs decreased with increasing the DSBP content. The cell structure of RPUFs was examined by scanning electron microscope (SEM) which displayed the cells as spherical or polyhedral. The thermal degradation and flame retardancy of RPUFs were investigated by thermogravimetric analysis, limiting oxygen index (LOI), and UL 94 vertical burning test. The degradation activation energy (Ea) of first degradation stage reduced from 80.05 kJ/mol to 37.84 kJ/mol with 80 wt% DSBP. The RUPF with 80 wt% DSBP achieved UL94 V-0 rating and LOI 28.3. The results showed that the flame retardant effect was mainly in both gas phase and condensed phase.

Download Full-text

Oxazolidone formation: myth or fact? The case of biobased polyurethane foams from different epoxidized triglycerides

Polymer Chemistry ◽

10.1039/d1py00129a ◽

2021 ◽

Author(s):

Julien Peyrton ◽

Luc Avérous

Keyword(s):

Polyurethane Foams ◽

Biobased Polyurethane

Study of the oxazolidone formation by reaction between disubstituted epoxide and isocyanate in polyurethane foams and model.

Download Full-text

Synthesis and mechanical characterization of nanoparticle-infused polyurethane foams. Statistical analysis of foam morphology

Nanosystems Physics Chemistry Mathematics ◽

10.17586/2220-8054-2016-7-3-464-471 ◽

2016 ◽

pp. 464-471

Author(s):

D.V. Pikhurov ◽

V.V. Zuev

Keyword(s):

Statistical Analysis ◽

Mechanical Characterization ◽

Polyurethane Foams ◽

Foam Morphology

Download Full-text

Synthesis and characterization of a novel modified expandable graphite and its application in rigid polyurethane foams

Proceedings of the 2017 6th International Conference on Energy, Environment and Sustainable Development (ICEESD 2017) ◽

10.2991/iceesd-17.2017.185 ◽

2017 ◽

Author(s):

Lin Liu ◽

Xiangjun Ma ◽

Rui Lv ◽

Zhengzhou Wang

Keyword(s):

Polyurethane Foams ◽

Synthesis And Characterization ◽

Expandable Graphite ◽

Rigid Polyurethane Foams

Download Full-text

Experimental Characterization of Traditional Mortars and Polyurethane Foams in Masonry Wall

Advances in Materials Science and Engineering ◽

10.1155/2018/8640351 ◽

2018 ◽

Vol 2018 ◽

pp. 1-13 ◽

Cited By ~ 7

Author(s):

Dora Foti ◽

Michela Lerna ◽

Vitantonio Vacca

Keyword(s):

Applied Load ◽

Thermal Inertia ◽

Masonry Wall ◽

Polyurethane Foams ◽

Masonry Walls ◽

Masonry Buildings ◽

Experimental Characterization ◽

Shear Tests ◽

The Poor

Masonry is a composite material largely used in construction. It exhibits several advantages, including significant compressive strength, thermal inertia, and aesthetic beauty. A disadvantage of masonry is mainly related to the inadequate shear strength due to the poor capacity and ductility of the adopted mortar. This aspect is crucial in seismic areas. In this paper, the behavior of polyurethane foams, used as adhesives for the construction of thin joints brick masonry walls, has been investigated. First, the characterization of components was carried out, followed by laboratory uniaxial tests on masonry walls and shear tests on triplets. Moreover, a comparison of the behavior of the foam-brick walls with respect to the traditional mortars masonry was carried out, as the type of joints varies and the arrangement of the holes of the bricks varies with respect to the direction of the applied load. Results provide indications on which adhesive has to be adopted for masonry buildings in reference to the site of construction (i.e., seismic hazard).

Download Full-text

Synthesis and Characterization of Bio-Based Rigid Polyurethane Foams with Varying Amount of Blowing Agent

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.803.346 ◽

2019 ◽

Vol 803 ◽

pp. 346-350

Author(s):

Jessalyn C. Grumo ◽

Lady Jaharah Y. Jabber ◽

Arnold A. Lubguban ◽

Rey Y. Capangpangan ◽

Arnold C. Alguno

Keyword(s):

Polyurethane Foam ◽

Functional Group ◽

Polyurethane Foams ◽

Synthesis And Characterization ◽

Rigid Polyurethane Foam ◽

Sem Images ◽

Average Cell Size ◽

Average Cell ◽

Blowing Agent

We report on the rigid polyurethane foam (RPUF) with varying amount of blowing agent. The effects of blowing agent in the formation of polyurethane will be characterized using scanning electron microscopy (SEM) and fourier transform infrared (FTIR) spectroscopy. SEM images revealed that varying the amount of blowing agent will significantly change the surface morphology of the resulting RPUF. The average cell size of the RPUF increases with increasing amount of blowing agent. Moreover, FTIR results revealed the presence of functional group related to formation of urethane bonds such as N-H, C=O, C=N and C-O-C stretching suggesting that polyurethane foam was successfully synthesized. This simple and straightforward process of RPUF using water as blowing agent will be economical.

Download Full-text

Influence of the Characteristics of Expandable Graphite on the Morphology, Thermal Properties, Fire Behaviour and Compression Performance of a Rigid Polyurethane Foam

Polymers ◽

10.3390/polym11010168 ◽

2019 ◽

Vol 11 (1) ◽

pp. 168 ◽

Cited By ~ 6

Author(s):

Pablo Acuña ◽

Zhi Li ◽

Mercedes Santiago-Calvo ◽

Fernando Villafañe ◽

Miguel Rodríguez-Perez ◽

...

Keyword(s):

Particle Size ◽

Oxygen Index ◽

Fire Behavior ◽

Polyurethane Foams ◽

Expandable Graphite ◽

Size Distributions ◽

Limiting Oxygen Index ◽

Compression Performance ◽

Cone Calorimeter Test

Three types of expandable graphite (EG) differing in particle size and expansion volume, are compared as flame retardant additives to rigid polyurethane foams (RPUFs). In this paper we discuss microstructure, thermal stability, fire behavior, and compression performance. We find that ell size distributions were less homogeneous and cell size was reduced. Furthermore, thermal conductivity increased along with EG loading. Thermogravimetric analysis (TGA) showed that EG only increased residue yield differently. The results indicate that a higher expansion of EG increased the limiting oxygen index (LOI) value, whereas a bigger particle size EG improved the rating of the vertical burning test (UL94). Results from the cone calorimeter test showed that a bigger particle size EG effectively reduced peak of heat release rate (pHRR). Furthermore, a higher expansion, led to a decrease in smoke production (TSP). The combination of both characteristics gives extraordinary results. The physical–mechanical characterization of the EG/RPUF foams revealed that their compression performance decreased slightly, mostly due to the effect of a bigger size EG.

Download Full-text