scholarly journals Steam Exploded Peanut Shell Fiber as the Filler in the Rigid Polyurethane Foams

2019 ◽  
Vol 7 (11) ◽  
pp. 1077-1091
Author(s):  
Zehui Ju ◽  
Qian He ◽  
Tianyi Zhan ◽  
Haiyang Zhang ◽  
Lin Sun ◽  
...  
Keyword(s):  
Polyurethane Foams ◽  
Peanut Shell ◽  
Rigid Polyurethane Foams

Effect of auxiliary blowing agents on properties of rigid polyurethane foams based on liquefied products from peanut shell

2017 ◽  
Vol 134 (48) ◽  
pp. 45582 ◽  
Author(s):  
Guangyu Zhang ◽  
Qinqin Zhang ◽  
Yumin Wu ◽  
Huan Zhang ◽  
Jingqiang Cao ◽  
...  
Keyword(s):  
Polyurethane Foams ◽  
Peanut Shell ◽  
Rigid Polyurethane Foams ◽  
Blowing Agents

scholarly journals Modification of Rigid Polyurethane Foams with the Addition of Nano-SiO2 or Lignocellulosic Biomass

Polymers ◽  
2020 ◽  
Vol 12 (1) ◽  
pp. 107 ◽  
Author(s):  
Qinqin Zhang ◽  
Xiaoqi Lin ◽  
Weisheng Chen ◽  
Heng Zhang ◽  
Dezhi Han
Keyword(s):  
Cell Structure ◽  
Chemical Characterization ◽  
Polyurethane Foams ◽  
Peanut Shell ◽  
Step Method ◽  
Residual Content ◽  
Nano Sio2 ◽  
Rigid Polyurethane Foams ◽  
Building Insulation ◽  
Composite Foams

Many achievements have been made on the research of composite polyurethane foams to improve their structure and mechanical properties, and the composite foams have been widely utilized in building insulation and furniture. In this work, rigid polyurethane foams (RPUFs) with the addition of different fillers (nano-SiO2, peanut shell, pine bark) were prepared through the one-step method. The effects of inorganic nano-SiO2 and organic biomass on foam properties were evaluated by means of physical and chemical characterization. The characterization results indicate that the compressive strength values of prepared foams could fully meet the specification requirement for the building insulation materials. The inorganic and organic fillers have no effect on the hydrogen bonding states in composite RPUFs. Furthermore, compared to the biomass fillers, the addition of nano-SiO2 greatly influenced the final residual content of the fabricated foam. All composite foams exhibit closed-cell structure with smaller cell size in comparison with the parent foam. The prepared composite foams have the potential for utilization in building insulation.

scholarly journals Open-Cell Rigid Polyurethane Foams from Peanut Shell-Derived Polyols Prepared under Different Post-Processing Conditions

Polymers ◽  
2019 ◽  
Vol 11 (9) ◽  
pp. 1392 ◽  
Author(s):  
Guangyu Zhang ◽  
Yumin Wu ◽  
Weisheng Chen ◽  
Dezhi Han ◽  
Xiaoqi Lin ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Water Absorption ◽  
Dimensional Stability ◽  
Polyurethane Foams ◽  
Environmental Conservation ◽  
Peanut Shell ◽  
Processing Conditions ◽  
Post Processing ◽  
Open Cell ◽  
Rigid Polyurethane Foams

Bio-based polyurethane materials with abundant open-cells have wide applications because of their biodegradability for addressing the issue of environmental conservation. In this work, open-cell rigid polyurethane foams (RPUFs) were prepared with bio-based polyols (BBPs) derived from the liquefaction of peanut shells under different post-processing conditions. The influences of the neutralization procedure and filtering operation for BBPs on the foaming behaviors, density, dimensional stability, water absorption, swelling ratio, compressive strength, and microstructure of RPUFs were investigated intensively. The results revealed that a small amount of sulfuric acid in the polyols exhibited a great impact on physical and chemical properties of RPUFs while the filtering operation for those polyols had a slight effect on the above properties. The RPUFs prepared from neutralized BBPs possessed higher water absorption, preferable dimensional stability and compression strength than that fabricated from the non-neutralized BBPs. Moreover, the prepared RPUFs exhibited preferable water absorption of 636–777%, dimensional stability of <0.5%, compressive strength of >200 KPa, lower swelling rate of ca. 1%, as well as uniform cell structure with superior open-cell rate, implying potential applications in floral foam.

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.

Improvement of thermal conductivity of rigid polyurethane foams with aluminum nitride filler

2021 ◽  
pp. 026248932198897
Author(s):  
Serife Akkoyun ◽  
Meral Akkoyun
Keyword(s):  
Thermal Conductivity ◽  
Aluminum Nitride ◽  
Polyurethane Foams ◽  
Thermal Transitions ◽  
Rigid Polyurethane Foams ◽  
Noticeable Increase ◽  
Polyurethane Composite ◽  
Composite Foams ◽  
Step Procedure ◽  
Electrical Conductivities

The aim of this work is the fabrication of electrically insulating composite rigid polyurethane foams with improved thermal conductivity. Therefore, this study is focused on the effect of aluminum nitride (AlN) on the thermal and electrical conductivities of rigid polyurethane foams. For this purpose, aluminum nitride/rigid polyurethane composite foams were prepared using a three-step procedure. The electrical and thermal conductivities of the foams were characterized. The thermal transitions, mechanical properties and morphology of the foams were also examined. The results reveal that AlN induces an increase of the thermal conductivity of rigid polyurethane foam of 24% which seems to be a relatively noticeable increase in polymeric foams. The low electrical conductivity of the foams is preserved.

Morphology and Mechanical Properties of Nylon-1010-filled Rigid Polyurethane Foams

2004 ◽  
Vol 36 (4) ◽  
pp. 333-349 ◽  
Author(s):  
Bo Yin ◽  
Zhong-Ming Li ◽  
Hui Quan ◽  
Ming-Bo Yang ◽  
Qiu-Ming Zhou ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Polyurethane Foams ◽  
Rigid Polyurethane Foams ◽  
Nylon 1010 ◽  
Morphology And Mechanical Properties

scholarly journals Polymers and Environment II. General Purpose Adhesives Prepared from Chemically Decomposed Waste Rigid Polyurethane Foams.

1993 ◽  
Vol 50 (11) ◽  
pp. 847-853 ◽  
Author(s):  
Shuchang XUE ◽  
Feifeng HE ◽  
Mituru OMOTO ◽  
Takao HIDAI ◽  
Yoshio IMAI
Keyword(s):  
General Purpose ◽  
Polyurethane Foams ◽  
Rigid Polyurethane Foams

Effects of a novel phosphorus–nitrogen flame retardant on rosin-based rigid polyurethane foams

2015 ◽  
Vol 120 ◽  
pp. 427-434 ◽  
Author(s):  
Meng Zhang ◽  
Zhenyang Luo ◽  
Jinwen Zhang ◽  
Shuigen Chen ◽  
Yonghong Zhou
Keyword(s):  
Flame Retardant ◽  
Polyurethane Foams ◽  
Rigid Polyurethane Foams
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