Block copolymers near the microphase separation transition. 2. Linear dynamic mechanical properties

1984 ◽  
Vol 17 (12) ◽  
pp. 2607-2613 ◽  
Author(s):  
Frank S. Bates
Keyword(s):  
Mechanical Properties ◽  
Block Copolymers ◽  
Microphase Separation ◽  
Dynamic Mechanical Properties ◽  
Dynamic Mechanical ◽  
Linear Dynamic

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.

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.

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