Elastic Response of Flexible Polyurethane Foams in Uniaxial Tension

1996 ◽  
Vol 118 (2) ◽  
pp. 157-161 ◽  
Author(s):  
W. H. El-Ratal ◽  
P. K. Mallick
Keyword(s):  
Noise Suppression ◽  
Constitutive Models ◽  
Stretch Ratio ◽  
Industrial Applications ◽  
Polyurethane Foams ◽  
Elastic Response ◽  
Uniaxial Tensile ◽  
Tensile Data ◽  
Flexible Polyurethane

Flexible polymeric foams are used in many industrial applications, including cushioning, shock absorption, and noise suppression. There have not been many systematic studies on the characterization of their elastic response that can be used in developing their constitutive behavior. This paper presents the uniaxial tensile data of two different flexible polyurethane foams and determines the relationships between their elastic properties and the major stretch ratio. These relationships will be useful in formulating constitutive models for flexible compressible materials.

Preparation and characterization of cation-exchange media based on flexible polyurethane foams

2002 ◽  
Vol 86 (7) ◽  
pp. 1773-1781 ◽  
Author(s):  
Kyeong-Ho Yeon ◽  
Jin-Woo Lee ◽  
Jae-Suk Lee ◽  
Seung-Hyeon Moon
Keyword(s):  
Cation Exchange ◽  
Polyurethane Foams ◽  
Flexible Polyurethane

Preparation and Characterization of Flexible Polyurethane Foams from Palm Oil-Based Polyol

2014 ◽  
Vol 911 ◽  
pp. 352-356 ◽  
Author(s):  
Duangphon Lumcharoen ◽  
Onusa Saravari
Keyword(s):  
Palm Oil ◽  
Polyurethane Foams ◽  
Toluene Diisocyanate ◽  
Indentation Hardness ◽  
Deflection Coefficient ◽  
Flexible Polyurethane ◽  
Polyether Polyol ◽  
Opposite Tendency ◽  
Pu Foams

Flexible polyurethane (PU) foams were prepared by replacing commercial petroleum-based polyether polyol with palm oil-based polyol up to 50 wt%. Palm oil was converted to polyol by transesterification reaction with glycerol using calcium oxide as a catalyst. PU foams were then prepared from reaction between mixtures of palm oil-based polyol and petrochemical polyols with toluene diisocyanate (TDI) using water as blowing agent. The morphology and physical-mechanical properties including apparent density, indentation hardness, compressive deflection coefficient or support factor, tensile strength, and tear strength of the prepared foams were characterized and compared to those of reference foam prepared using only conventional petrochemical polyols. Scanning electron microscopy (SEM) indicated that the cellular structures of all the prepared foams were semi-open and the cell size decreased with higher amount of palm oil-based polyol. The apparent densities and the compressive deflection coefficient of the PU foams increased with the increasing amount of palm oil-based polyol, while the indentation hardness showed the opposite tendency. Furthermore, the obtained foam modified with palm oil-based polyol of 20 wt% were found to have the highest tensile and tear strengths.

Solid-state NMR characterization of motion in flexible polyurethane foams

1994 ◽  
Vol 52 (9) ◽  
pp. 1175-1180 ◽  
Author(s):  
J. C. Moreland ◽  
G. L. Wilkes ◽  
C. G. Moreland ◽  
S. S. Sankar ◽  
E. O. Stejskal ◽  
...  
Keyword(s):  
Solid State ◽  
Solid State Nmr ◽  
Polyurethane Foams ◽  
Nmr Characterization ◽  
Flexible Polyurethane

Characterization of flexible polyurethane foams based on soybean-based polyols

2009 ◽  
Vol 112 (1) ◽  
pp. 299-308 ◽  
Author(s):  
Sudipto Das ◽  
Mahendra Dave ◽  
G. L. Wilkes
Keyword(s):  
Polyurethane Foams ◽  
Flexible Polyurethane

Preparation and characterization of bio-polyol and bio-based flexible polyurethane foams from fast pyrolysis of wheat straw

2017 ◽  
Vol 103 ◽  
pp. 64-72 ◽  
Author(s):  
Hongwei Li ◽  
Nubla Mahmood ◽  
Zhen Ma ◽  
Mingqiang Zhu ◽  
Junqi Wang ◽  
...  
Keyword(s):  
Wheat Straw ◽  
Fast Pyrolysis ◽  
Polyurethane Foams ◽  
Flexible Polyurethane

Characterization of Local Structures in Flexible Polyurethane Foams by Solid-state NMR and FTIR Spectroscopy

2006 ◽  
Vol 42 (4) ◽  
pp. 307-323 ◽  
Author(s):  
Hideyuki Oka ◽  
Yuji Tokunaga ◽  
Takahiro Masuda ◽  
Hiroyuki Kiso ◽  
Hiroyuki Yoshimura
Keyword(s):  
Solid State ◽  
Ftir Spectroscopy ◽  
Solid State Nmr ◽  
Polyurethane Foams ◽  
Local Structures ◽  
Flexible Polyurethane

Synthesis, Characterization, and Dynamic Behavior of Well-defined Dithiomaleimide-functionalized Maltodextrins

2020 ◽  
Vol 17 (2) ◽  
pp. 85-89
Author(s):  
Francisco J. Hidalgo ◽  
Nathan A.P. Lorentz ◽  
TinTin B. Luu ◽  
Jonathan D. Tran ◽  
Praveen D. Wickremasinghe ◽  
...  
Keyword(s):  
Physicochemical Properties ◽  
Dynamic Behavior ◽  
Industrial Applications ◽  
19F Nmr ◽  
Nmr Studies ◽  
Synthetic Pathway ◽  
End Groups ◽  
Sugar End

: Maltodextrins have an increasing number of biomedical and industrial applications due to their attractive physicochemical properties such as biodegradability and biocompatibility. Herein, we describe the development of a synthetic pathway and characterization of thiol-responsive maltodextrin conjugates with dithiomaleimide linkages. 19F NMR studies were also conducted to demonstrate the exchange dynamics of the dithiomaleimide-functionalized sugar end groups.

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