In‐situ thermal aging of biobased and conventional rigid polyurethane foams nanostructured with bacterial nanocellulose

2021 ◽  
pp. 51824
Author(s):  
Tomás Joaquin Diaz ◽  
Patricia Cerrutti ◽  
Leonel Matías Chiacchiarelli
Keyword(s):  
Thermal Aging ◽  
Polyurethane Foams ◽  
Bacterial Nanocellulose ◽  
Rigid Polyurethane Foams

Compressive behavior of rigid polyurethane foams nanostructured with bacterial nanocellulose at low and intermediate strain rates

2019 ◽  
Vol 137 (20) ◽  
pp. 48701 ◽  
Author(s):  
Leonel Matías Chiacchiarelli ◽  
Patricia Cerrutti ◽  
Emmanuel A. Flores‐Johnson
Keyword(s):  
Polyurethane Foams ◽  
Strain Rates ◽  
Compressive Behavior ◽  
Bacterial Nanocellulose ◽  
Rigid Polyurethane Foams ◽  
Intermediate Strain Rates

scholarly journals Nanostructured rigid polyurethane foams with improved specific thermo‐mechanical properties using bacterial nanocellulose as a hard segment

2021 ◽  
pp. 50520
Author(s):  
Sofía Benavides ◽  
Franco Armanasco ◽  
Patricia Cerrutti ◽  
Leonel Matías Chiacchiarelli
Keyword(s):  
Mechanical Properties ◽  
Hard Segment ◽  
Polyurethane Foams ◽  
Bacterial Nanocellulose ◽  
Rigid Polyurethane Foams

Flame-retardant system for rigid polyurethane foams based on diethyl bis(2-hydroxyethyl)aminomethylphosphonate and in-situ exfoliated clay

2020 ◽  
Vol 177 ◽  
pp. 109178 ◽  
Author(s):  
Shihu Han ◽  
Xiaodong Zhu ◽  
Fang Chen ◽  
Shanhua Chen ◽  
Hui Liu
Keyword(s):  
Flame Retardant ◽  
Polyurethane Foams ◽  
Rigid Polyurethane Foams

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.

The role of genetic manipulation and in situ modifications on production of bacterial nanocellulose: A review

2021 ◽  
Author(s):  
Mehran Moradi ◽  
Paulina Jacek ◽  
Azra Farhangfar ◽  
Jonas T. Guimarães ◽  
Mehrdad Forough
Keyword(s):  
Genetic Manipulation ◽  
Bacterial Nanocellulose

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
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