Preparation and Test of Polyurethane Foam Composites with Alkali Lignin/Renewable PUF

2010 ◽  
Vol 150-151 ◽  
pp. 1167-1170
Author(s):  
Chang Yu Li ◽  
Li Li Liu
Keyword(s):  
Thermal Stability ◽  
Compressive Strength ◽  
Polyurethane Foam ◽  
Compression Property ◽  
Alkali Lignin ◽  
Foam Composite ◽  
Thermal Stability Of

The polyurethane foam composite was prepared by alkali lignin and renewable polyurethane foam (PUF). The thermal stability as well as compression property was studied. It was obtained from the TG curve and the DTG curve that the initial decomposition temperatures of polyurethane foam composites with 10% renewable PUF and without renewable PUF were 560.25K and 574.13K,respectively, which showed the renewable PUF affacted the thermal stability of the polyurethane foam composite. The compressive strength (σ10)was from 203kPa to 125 kPa , which were affacted by the dose of the renewable PUF.

Enhanced Thermal Stability of Esterified Lignin in Different Solvent Mediums

2018 ◽  
Vol 9 (1) ◽  
pp. 39-49 ◽  
Author(s):  
Sharifah Nurul Ain Syed Hashim ◽  
Sarani Zakaria ◽  
Chin Hua Chia ◽  
Sharifah Nabihah Syed Jaafar
Keyword(s):  
Thermal Stability ◽  
Alkaline Solution ◽  
Room Temperature ◽  
Hydroxyl Groups ◽  
Aqueous Alkaline Solution ◽  
Alkali Lignin ◽  
Weight Percentage ◽  
H Nmr ◽  
Ft Ir ◽  
Thermal Stability Of

In this study, soda alkali lignin from oil palm empty fruit bunch (EFB-AL) and kenaf core (KC-AL) are esterified with maleic anhydride under two different conditions, namely i) pyridine at temperature of 120°C for 3h and ii) aqueous alkaline solution at room temperature for 4h. As a result, the weight percentage gain (WPG) of the esterified EFB-AL (EFB-EL) and esterified KC-AL (KC-EL) in pyridine demonstrated a higher compared to aqueous alkaline solution. The FT-IR results of EFB-EL and KC-EL in both solvents exhibited some changes at the carbonyl and hydroxyl groups. Furthermore, the esterification process induced the carboxylic peak to appear in both alkali lignin samples. The outcome is confirmed by conducting H-NMR analysis, which demonstrated ester and carboxylic acid peaks within the spectral analysis. Finally, the TGA results showed both EFB-EL and KC-EL that are exposed to aqueous alkaline actually possessed better thermal stability and higher activation energy (Ea) compared to the esterified samples in pyridine.

Long-term thermal stability of carbon fibre-reinforced addition-type polyimide composite in terms of compressive strength

2018 ◽  
Vol 28 (2) ◽  
pp. 115-133 ◽  
Author(s):  
Yuki Kubota ◽  
Takefumi Furuta ◽  
Takuya Aoki ◽  
Yuichi Ishida ◽  
Toshio Ogasawara ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Compressive Strength ◽  
Carbon Fibre ◽  
Thermal Stability Of

Fabrication of carbon black coated flexible polyurethane foam for significantly improved fire safety

RSC Advances ◽  
2015 ◽  
Vol 5 (69) ◽  
pp. 55870-55878 ◽  
Author(s):  
Wei Wang ◽  
Haifeng Pan ◽  
Bin Yu ◽  
Ying Pan ◽  
Lei Song ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Carbon Black ◽  
Polyurethane Foam ◽  
Fire Safety ◽  
Low Cost ◽  
Polyurethane Acrylate ◽  
Flexible Polyurethane Foam ◽  
Flexible Polyurethane ◽  
Thermal Stability Of

Fire resistant coatings, composed of nanosized carbon black (CB) and polyurethane acrylate (PUA), were synthesized through a facile and low-cost method to improve the fire safety and thermal stability of flexible polyurethane foam (FPU).

scholarly journals Green Flexible Polyurethane Foam as a Potent Support for Fe-Si Adsorbent

Polymers ◽  
2019 ◽  
Vol 11 (12) ◽  
pp. 2011 ◽  
Author(s):  
Afiqah Ahmad ◽  
Siti Nurul Ain Md. Jamil ◽  
Thomas Shean Yaw Choong ◽  
Abdul Halim Abdullah ◽  
Mohd Sufri Mastuli ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Polyurethane Foam ◽  
Palm Oil ◽  
Morphological Analysis ◽  
Physical Interaction ◽  
Drying Method ◽  
Polyurethane Composite ◽  
Flexible Polyurethane Foam ◽  
Flexible Polyurethane ◽  
Thermal Stability Of

This paper describes the preparation, characterisation, and potential application of flexible palm oil-based polyurethane foam (PUF) as a support for iron-silica (Fe-Si) adsorbent. Fe-Si/polyurethane composite (Fe-Si/PUC) was prepared by impregnating Fe-Si adsorbent onto the surface of PUF by using a novel immersion-drying method. Morphological analysis of Fe-Si/PUC proved that Fe-Si was successfully impregnated onto the surface of PUF. Compression test and thermogravimetric analysis were carried out to determine the flexibility and thermal stability of Fe-Si/PUC, respectively. The Fe-Si/PUC removed 90.0% of 10 ppm methylene blue (MB) from aqueous solution in 60 min. The reusability study showed that Fe-Si/PUC removed 55.9% of MB on the seventh cycle. Hence, the synthesis of Fe-Si/PUC opens up a new path of implementing palm oil-based PUF to assist in the recovery of an adsorbent for environmental clean-up. The mechanism of physical interaction during the impregnation of Fe-Si adsorbent onto PUF was proposed in this paper.

scholarly journals Optimization of the Solidification Method of High-Level Waste for Increasing the Thermal Stability of the Magnesium Potassium Phosphate Compound

Energies ◽  
2020 ◽  
Vol 13 (15) ◽  
pp. 3789
Author(s):  
Svetlana A. Kulikova ◽  
Sergey S. Danilov ◽  
Kseniya Yu. Belova ◽  
Anastasiya A. Rodionova ◽  
Sergey E. Vinokurov
Keyword(s):  
Heat Treatment ◽  
Thermal Stability ◽  
Compressive Strength ◽  
Potassium Phosphate ◽  
Treatment Temperature ◽  
High Level Waste ◽  
Leaching Rate ◽  
High Level ◽  
The Impact ◽  
Thermal Stability Of

The key task in the solidification of high-level waste (HLW) into a magnesium potassium phosphate (MPP) compound is the immobilization of mobile cesium isotopes, the activity of which provides the main contribution to the total HLW activity. In addition, the obtained compound containing heat-generating radionuclides can be significantly heated, which increases the necessity of its thermal stability. The current work is aimed at assessing the impact of various methodological approaches to HLW solidification on the thermal stability of the MPP compound, which is evaluated by the mechanical strength of the compound and its resistance to cesium leaching. High-salt surrogate HLW solution (S-HLW) used in the investigation was prepared for solidification by adding sorbents of various types binding at least 93% of 137Cs: ferrocyanide K-Ni (FKN), natural zeolite (NZ), synthetic zeolite Na-mordenite (MOR), and silicotungstic acid (STA). Prepared S-HLW was solidified into the MPP compound. Wollastonite (W) and NZ as fillers were added to the compound composition in the case of using FKN and STA, respectively. It was found that heat treatment up to 450 °C of the compound containing FKN and W (MPP-FKN-W) almost did not affect its compressive strength (about 12–19 МPa), and it led to a decrease of high compressive strength (40–50 MPa) of the compounds containing NZ, MOR, and STA (MPP-NZ, MPP-MOR, and MPP-STA-NZ, respectively) by an average of 2–3 times. It was shown that the differential leaching rate of 137Cs on the 28th day from MPP-FKN-W after heating to 250 °C was 5.3 × 10−6 g/(cm2∙day), however, at a higher temperature, it increased by 20 and more times. The differential leaching rate of 137Cs from MPP-NZ, MPP-MOR, and MPP-STA-NZ had values of (2.9–11) × 10−5 g/(cm2∙day), while the dependence on the heat treatment temperature of the compound was negligible.

Study on Preparation of Biodegradable Polyurethane Foam

2014 ◽  
Vol 633-634 ◽  
pp. 257-260 ◽  
Author(s):  
Cai Long Zhou ◽  
Yu Feng Li ◽  
Shu Quan Wan
Keyword(s):  
Thermal Stability ◽  
Polyurethane Foam ◽  
Degradation Rate ◽  
Toluene Diisocyanate ◽  
Tung Oil ◽  
Good Thermal Stability ◽  
Soil Burial ◽  
Biodegradable Polyurethane ◽  
Polyether Polyol ◽  
Thermal Stability Of

Biodegradable polyurethane foam (PUF) was prepared by using tung oil and starch as the modifiers, they were mixed with polyether polyol and some other reaction auxiliary agents, and then reacted with toluene diisocyanate (TDI). The structure and thermal stability of products were analyzed based on SEM and TG, and the soil burial method was used to investigate the biodegradability of products. The results indicated that polyurethane foam modified by tung oil and starch has good thermal stability, good mechanical properties and good biodegradability. The degradation rate of PUF modified by 5: 2 of starch/ tung oil was 38% after 120 d.

scholarly journals Flame retardancy and thermal stability of polyurethane foam composites containing carbon additives

2016 ◽  
Author(s):  
Pyoung-Chan Lee ◽  
Bo-Ram Kim ◽  
Sun Kyoung Jeoung ◽  
Geesoo Lee ◽  
San Wook Han ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Polyurethane Foam ◽  
Flame Retardancy ◽  
Carbon Additives ◽  
Thermal Stability Of
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