Effect of the Starting NCO/OH Molar Ratio on the Structure and Properties of Polyurethane

2011 ◽  
Vol 415-417 ◽  
pp. 1261-1264
Author(s):  
Yu Hua Yi ◽  
Hao Shi
Keyword(s):  
Mechanical Properties ◽  
Microphase Separation ◽  
Dynamic Mechanical Properties ◽  
Toluene Diisocyanate ◽  
Molar Ratio ◽  
Structure And Properties ◽  
Dynamic Mechanical ◽  
Compression Set

The present study described the effect of the starting NCO/OH molar ratio on the structure and properties of castable polyurethanes based on polytetrahydrofuran glycol (PTMG) and 2,4- toluene diisocyanate (TDI). The structural was tested by SEM. The result showed that higher starting NCO/OH molar ratio can lead to higher degree of microphase separation, decrease the compression set and improve the dynamic mechanical properties.

Influence of Diisocyanates on Dynamic Mechanical Properties of Castable Polyurethane Elastomers

2012 ◽  
Vol 217-219 ◽  
pp. 563-566
Author(s):  
Xiao Dong Chen ◽  
Yu Hua Yi
Keyword(s):  
Mechanical Properties ◽  
Dynamic Mechanical Analysis ◽  
Dynamic Mechanical Properties ◽  
Mechanical Analysis ◽  
Toluene Diisocyanate ◽  
Diphenylmethane Diisocyanate ◽  
Analysis Method ◽  
Polyurethane Elastomers ◽  
Dynamic Mechanical ◽  
Soft Segments

A series of castable polyurethane elastomers, based on polytetramethylene glycol as soft segments and toluene diisocyanate, 4, 4’-diphenylmethane diisocyanate, P-phenylene diisocyanate as diisocyanates respectively, were synthesized. The dynamic mechanical analysis method was utilized to determine tan delta property (tanδ). Also the influence of diisocyanates on the dynamic mechanical properties of castable polyurethane elastomers was analyzed. It can be concluded that the P-phenylene diisocyanate system elastomers have the most excellent dynamic mechanical properties.

Structure and Properties of Model Polybutadienes - Effect of Microstructure on the Dynamic Mechanical Properties of Rubber

2005 ◽  
Vol 37 (3) ◽  
pp. 267-278 ◽  
Author(s):  
Marvin R. Rivera ◽  
Rafael Herrera Nájera ◽  
Juan José Benvenuta Tapia ◽  
Leonardo Ríos Guerrero
Keyword(s):  
Mechanical Properties ◽  
Dynamic Mechanical Properties ◽  
Structure And Properties ◽  
Dynamic Mechanical ◽  
Effect Of Microstructure

Preparation and characterization of polyurethane damping materials derived from mixed-base prepolymers containing numerous side methyls

e-Polymers ◽  
2015 ◽  
Vol 15 (5) ◽  
pp. 323-327 ◽  
Author(s):  
Yang Feng ◽  
Haijun Zhou ◽  
Xiaolei Zhang ◽  
Yongzhen Li ◽  
Yantao Li
Keyword(s):  
Mechanical Properties ◽  
Testing Machine ◽  
Dynamic Mechanical Properties ◽  
Toluene Diisocyanate ◽  
Scanning Tunneling ◽  
Polypropylene Glycol ◽  
Tunneling Microscopy ◽  
Tensile Testing Machine ◽  
Dynamic Mechanical ◽  
Damping Materials

AbstractPolyurethane (PU) damping materials were prepared by mixed-base PU prepolymers and 4,4′-methylene- bis-(2-chloroaniline) (MOCA) as chain extender. The prepolymer was synthesized from poly(hydroxypivalyl hydroxypivalate succinate) (PHPS) or polypropylene glycol 2000 (PPG-2000) with 2,4-toluene diisocyanate (TDI-100), respectively. The structure, morphology, and dynamic and static mechanical properties were characterized by Fourier transform infrared spectroscopy (FT-IR), scanning tunneling microscopy (STM), dynamic mechanical thermal analysis (DMA), and tensile testing machine, respectively. The results indicated that the mass ratios of polyester prepolymer (PESP) and polyether prepolymer (PETP) (mPESP/mPETP ratio) had significantly affected the dynamic mechanical properties of the PUs. When the mPESP/mPETP ratio was 40/60 and 45/55, and PUs had the temperature range (ΔT) higher than 60°C for efficient loss factor (tanδ>0.4) in the DMA curve with bimodal. The phase diagrams of STM indicated that more complex combination of hard and soft segments existed in the PUs, and the segments of PESP and PETP formed irregular block structures. Furthermore, the mechanical properties of PUs were of higher value. It is believed that PUs may be used as potential damping materials.

Study on Morphology and Mechanical Properties of Polyaspartic Esters Based Polyureas

2011 ◽  
Vol 197-198 ◽  
pp. 1289-1293
Author(s):  
Wei Bo Huang ◽  
Ping Lu ◽  
Jing Zhang ◽  
Xin Mao Li
Keyword(s):  
Mechanical Properties ◽  
Microphase Separation ◽  
Dynamic Mechanical Properties ◽  
Mechanical Analysis ◽  
Hexamethylene Diisocyanate ◽  
Shock Absorption ◽  
Dynamic Mechanical ◽  
Atomic Force ◽  
Weight Test ◽  
Drop Weight Test

The morphology, shock absorption and dynamic mechanical properties of a new architectured multifunctional materials- polyaspartic esters (PAE) based ployureas were investigated through FTIR, atomic force microscope(AFM), drop-weight test and dynamic mechanical analysis(DMA). The PAE based polyureas were prepared from synthesized PAE and hexamethylene diisocyanate（HDI）trimer /polytetramethylene ether glycol (PTMG) prepolymer. The FTIR results indicated that hydrogen-bonded urea carbonyl of PAE based polyurea was 76.1%, and the length of hydrogen bonding was 0.306nm. The microphase separation phenomenon of the PAE based polyureas were observed directly through AFM topography studies. PAE based polyureas exhibited unique shock absorption and dynamic mechanical properties.

Polyurethanes based on hydroxylated rapeseed oil: thermal and dynamic mechanical properties

2015 ◽  
Vol 37 (2) ◽  
pp. 162-167
Author(s):  
V.A. Vilensky ◽  
◽  
L.V. Kobrina ◽  
S.V. Riabov ◽  
Y.Y. Kercha ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Rapeseed Oil ◽  
Dynamic Mechanical Properties ◽  
Dynamic Mechanical
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