High performance biobased pour-in-place rigid polyurethane foams from facile prepared castor oil-based polyol: Good compatibility with pentane series blowing agent

2021 ◽  
pp. 0021955X2110626
Author(s):  
Ismail Omrani
Keyword(s):  
Castor Oil ◽  
High Performance ◽  
Polyurethane Foams ◽  
One Pot ◽  
Hydroxyl Value ◽  
Rigid Polyurethane Foams ◽  
H Nmr ◽  
Blowing Agent ◽  
System A ◽  
Ft Ir

In this paper, biobased and environmentally friendly rigid polyurethane foams (RPUF) from high hydroxyl value castor oil-based polyols have been prepared without the addition of petroleum-based polyols in the formulation. The new Biopolyol with high hydroxyl value was designed on the basis of the analysis of functionality, structure and hydroxyl value relation and synthesized directly from castor oil in a facile one-pot three-step system. A series of Biopolyols with hydroxyl values in the range of 550–650 mg KOH/g were obtained through transesterification, epoxidation, and hydrolysis. The Biopolyol chemical structure was characterized using FT-IR,1H NMR spectroscopies. The formulated blend polyol with amine catalysts and cyclopentane as a blowing agent have good cyclopentane solubility and phase separation between cyclopentane and polyol was not observed after 30 days. The foaming characteristics were evaluated and improved results were obtained. The thermal conductivity, thermal stability, compressive strength, morphology, dimensional stability, density, and foam flow of the RPUFs were characterized. The results are compared with RPUF prepared using standard commercial polyether polyols for pour-in-place RPUFs. The prepared biobased RPUFs from Biopolyol was able to reach the required satisfactory properties for the appliance industry.

Preparation and Characterization of Soybean Oil-based Flame Retardant Rigid Polyurethane Foams Containing Phosphaphenanthrene Groups

2020 ◽  
Vol 17 (10) ◽  
pp. 760-771
Author(s):  
Qirui Gong ◽  
Niangui Wang ◽  
Kaibo Zhang ◽  
Shizhao Huang ◽  
Yuhan Wang
Keyword(s):  
Soybean Oil ◽  
Flame Retardant ◽  
Chemical Structure ◽  
Cell Structure ◽  
Polyurethane Foams ◽  
Limiting Oxygen Index ◽  
Rigid Polyurethane Foams ◽  
Degradation Activation Energy ◽  
Ft Ir

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.

PREPARATION AND CHARACTERIZATION OF GLYCYRRHETINIC ACID-MODIFIED POLOXAMER 188/CHITOSAN NANOPARTICLES

NANO ◽  
2013 ◽  
Vol 08 (04) ◽  
pp. 1350042 ◽  
Author(s):  
JING WANG ◽  
LI GUO ◽  
LI FANG MA
Keyword(s):  
High Performance ◽  
Drug Loading ◽  
Chitosan Nanoparticles ◽  
Spherical Shape ◽  
Glycyrrhetinic Acid ◽  
Poloxamer 188 ◽  
H Nmr ◽  
Ft Ir

In this paper, we firstly synthesized glycyrrhetinic acid-modified double amino-terminated poloxamer 188 (GA–NH–POLO–NH–GA). The structure of the synthesized compound was confirmed by 1H-NMR and Fourier transform infrared (FT-IR) spectroscopy. Then the nanoparticles composed of GA–NH–POLO–NH–GA/chitosan (GA–NH–POLO–NH–GA/CTS) were prepared by an ionic gelation process. The characterization of the nanoparticles was measured by dynamic light scattering (DLS) and scanning electron microscope (SEM). The results showed that the nanoparticles were well dispersed with a spherical shape and the particle size was distributed between 100 nm and 300 nm. The cytotoxicity based on MTT assay against cells (QGY-7703 cells and L929 cells) showed that the nanoparticles had low toxicity and good biocompatibility. The encapsulation efficiency and drug loading of 5-fluorouracil-loaded nanoparticles (5-FU nanoparticles) were measured by high-performance liquid chromatography (HPLC) and fluorescence spectroscopy, ultraviolet-visible (UV-vis) absorbance. The encapsulation of 5-Fu-loaded CTS nanoparticles was 12.8% and the drug loading was 2.9%, while the encapsulation of 5-Fu-loaded GA–NH–POLO–NH–GA/CTS nanoparticles was 20.9% and the drug loading was 3.36%. The release profile showed that the GA–NH–POLO–NH–GA/CTS nanoparticles were available for sustained release of 5-Fu. The GA–NH–POLO–NH–GA/CTS nanoparticles have a higher affinity to the QGY-7703 cells, so indicated that the GA–NH–POLO–NH–GA/CTS nanoparticles have the capacity of liver-targeting in vitro.

1,1,2-Trifluoroethane (HFC-143):Zero-ODP Blowing Agent for Rigid Polyurethane Foams Using Conventional Dispensing Equipment

1995 ◽  
Vol 31 (6) ◽  
pp. 513-531
Author(s):  
P. P. Barthelemy ◽  
A. Leroy ◽  
J. A. Franklin ◽  
L. Zipfel ◽  
W. Krücke
Keyword(s):  
Polyurethane Foams ◽  
Rigid Polyurethane Foams ◽  
Blowing Agent

Formic acid as a co-blowing agent in rigid polyurethane foams

1998 ◽  
Vol 34 (9) ◽  
pp. 1233-1241 ◽  
Author(s):  
M. Modesti ◽  
N. Baldoin ◽  
F. Simioni
Keyword(s):  
Formic Acid ◽  
Polyurethane Foams ◽  
Rigid Polyurethane Foams ◽  
Blowing Agent

scholarly journals Microwave-Assisted Hydrogenation of Codeine in Aqueous Media

2012 ◽  
Vol 2012 ◽  
pp. 1-4 ◽  
Author(s):  
F. Taktak ◽  
I. Bulduk
Keyword(s):  
Aqueous Solution ◽  
Aqueous Media ◽  
One Pot ◽  
H Nmr ◽  
Microwave Assisted ◽  
Analysis Technique ◽  
Purity Analysis ◽  
Ft Ir ◽  
Elemental Analysis Technique ◽  
C Nmr

An efficient one-pot microwave-assisted hydrogenation of codeine was achieved in aqueous solution. This technique is simple, fast, environmentally friendly, and highly efficient. Structure of produced dihydrocodeine was approved by using FT-IR, 1H NMR, 13C NMR, EIMS, and elemental analysis technique. Its purity analysis was performed by using HPLC and assay analysis was performed by using potentiometric titration methods.

scholarly journals Polyurethane Foams for Thermal Insulation Uses Produced from Castor Oil and Crude Glycerol Biopolyols

2017 ◽  
Author(s):  
Camila S. Carriço ◽  
Thaís Fraga ◽  
Vagner E. Carvalho ◽  
Vânya M. D. Pasa
Keyword(s):  
Thermal Conductivity ◽  
Compressive Strength ◽  
Young’S Modulus ◽  
Thermal Insulation ◽  
Castor Oil ◽  
Crude Glycerol ◽  
Young's Modulus ◽  
Polyurethane Foams ◽  
Co2 Production ◽  
Blowing Agent

Rigid polyurethane foams were synthesized using a renewable polyol from the simple physical mixture of castor oil and crude glycerol. The effect of the catalyst and blowing agent in the foams properties was evaluated. The use of physical blowing agent (cyclopentane and n-pentane) allowed obtaining foams with smaller cells in comparison with the foams produced with a chemical blowing agent (water). The increase of water content caused a decrease of density, thermal conductivity, compressive strength and Young's modulus, which indicates that the increment of CO2 production contributes to the formation of larger cells. Higher amount of catalyst in the foam formulations caused a slight density decrease and an increase small significance of thermal conductivity, compressive strength and Young's modulus values. These green foams presented properties that indicate a great potential to be used as thermal insulation, as density (23 - 41 kg m-3), thermal conductivity (0.0128 – 0.0207 W m-1 K-1), compressive strength (45 - 188 kPa) and Young's modulus (3 - 28 kPa). These biofoams are also environmental friendly alternatives and can aggregate revenue to biodiesel industry, contributing for reduction of this fuel prices.

Synthesis and Characterization of Imidazo[1,2-a]Pyrimidine

2015 ◽  
Vol 52 ◽  
pp. 1-4
Author(s):  
A.M. Shah ◽  
A.J. Rojivadiya
Keyword(s):  
Mass Spectroscopy ◽  
Synthesis And Characterization ◽  
Spectroscopic Techniques ◽  
One Pot ◽  
H Nmr ◽  
Ft Ir ◽  
C Nmr

An efficient protocol for the synthesis of imidazo [1,2-a] pyrimidine was developed by using three component one-pot Biginelli synthesis. The synthesized compounds were characterized by spectroscopic techniques like FT-IR, 1H NMR, 13C NMR, and mass spectroscopy.

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