Mechanical modeling and testing of different polyamides considering molecular chain structure, crystallinity, and large strains

2022 ◽  
pp. 111419
Author(s):  
T. Yoshida ◽  
T. Nakane ◽  
M. Uchida ◽  
Y. Kaneko
Keyword(s):  
Chain Structure ◽  
Molecular Chain ◽  
Large Strains ◽  
Mechanical Modeling

Characterization of the trans-structure in the molecular chain structure of natural rubber

2021 ◽  
pp. 131209
Author(s):  
Zechun Li ◽  
Changjin Yang ◽  
Yanchan Wei ◽  
Yuanbing Zhou ◽  
Shuangquan Liao
Keyword(s):  
Natural Rubber ◽  
Chain Structure ◽  
Molecular Chain ◽  
Trans Structure

scholarly journals Effect of molecular weight on CO2-philicity of poly(vinyl acetate) with different molecular chain structure

2016 ◽  
Vol 118 ◽  
pp. 96-106 ◽  
Author(s):  
Dongdong Hu ◽  
Yingna Zhang ◽  
Mei Su ◽  
Lei Bao ◽  
Ling Zhao ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Vinyl Acetate ◽  
Chain Structure ◽  
Molecular Chain

Spectroscopic study on the molecular polar arrangement and anchoring mechanism in crystalline DR1 films deposited on ITO by electric field assisted PVD process

2018 ◽  
Vol 27 (02) ◽  
pp. 1850021
Author(s):  
H. Herman ◽  
R. E. Siregar ◽  
M. O. Tjia
Keyword(s):  
Electric Field ◽  
Physical Vapor Deposition ◽  
Second Harmonic ◽  
Chain Structure ◽  
Molecular Chain ◽  
Sem Images ◽  
Film Stability ◽  
Hydrogen Bondings ◽  
Deposited Films ◽  
Transmission And Reflection

We report the results of a systematic study for the elucidation of detailed molecular arrangements in Disperse Red 1(DR1) films prepared by electric field assisted physical vapor deposition (EFA-PVD) method on ITO substrate with varied field strength. Aside from confirming the periodic molecular chain structure reported previously, the electric field induced increase of crystallinity is corroborated by the enhanced crystalline appearance in the SEM images of the films deposited with increased applied field up to a certain limit. The optical spectroscopic measurements in both the transmission and reflection modes clearly show that instead of the anti-parallel polar arrangement found previously in films deposited without the applied electric field, it is the parallel arrangements of molecular aggregates that are found in the currently produced films which offer its potential application for the generation of second harmonic (SH) light. A detailed analysis of the additional FTIR-RAS data further reveals the formation of hydrogen bondings in the head-to-tail stacking along the molecular chain responsible for its periodic structure, as well as those between the DR1 hydroxyl end groups and the oxide components in the ITO substrate which provides the molecular immobilizing or anchoring mechanism for the deposited films. This explains in turn, the improved film stability and the formation of the highly desirable parallel polar arrangement of the DR1 molecules in the deposited films, promising for SHG and other related nonlinear optical (NLO) applications.

The Concrete Protective Effect of Silane Impregnated Materials with Different Molecular Chain Structure

2014 ◽  
Vol 919-921 ◽  
pp. 439-442
Author(s):  
Hong Song Wang ◽  
Wei Wang ◽  
Rui Wang ◽  
Wen Bin Wang ◽  
Lei Li ◽  
...  
Keyword(s):  
Concrete Surface ◽  
Chain Structure ◽  
Chloride Ions ◽  
Molecular Structures ◽  
Molecular Chain ◽  
Bridge Engineering ◽  
Protective Effects ◽  
Depth Of Penetration ◽  
Drying Time ◽  
The Impact

The concrete building protection materials is widely used in the hydraulic and bridge engineering. It was found that integral silane treatment can improve the durability of concrete.Compared with other protective methods, Silicone protect materials is the most convenient and environmentally-friendly.The silicone materials can effectively block the invasion of harmful substances such as water and chloride ions, and prevent the occurrence of the freeze-thaw damage. Few studies reported the protective effects of silane material which have different molecular structures .We found that Silane with relatively long molecular chain structure have a slower evaporation rate .When the concrete surface treated with such a silane material,the concrete surface has a 22% longer time to dry, so that the depth of penetration increased 16% for a longer concrete infiltration reaction time. we also studied the impact of temperature and humidity on the drying time of silane material , found using a suitable surface moisture conditions can get better protection.

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