Effect of the cyclic structure content on aliphatic polycarbonate-based polyurethane

2021 ◽  
Author(s):  
Yuan-Hsiang Wu ◽  
Cheng-Chien Wang ◽  
Chuh-Yung Chen
Keyword(s):  
Cyclic Structure ◽  
Aliphatic Polycarbonate

scholarly journals Electronic Structure of n-Cycloparaphenylenes Directly Observed by Photoemission Spectroscopy

2021 ◽  
Author(s):  
Kaname Kanai ◽  
Takuya Inoue ◽  
Takaya Furuichi ◽  
Kaito Shinoda ◽  
Takashi Iwahashi ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Electronic Structures ◽  
Photoemission Spectroscopy ◽  
Cyclic Structure ◽  
Visible Absorption ◽  
X Ray ◽  
Inverse Photoemission

A series of n-cycloparaphenylenes ([n]CPP) were studied by ultraviolet photoemission, inverse photoemission, ultraviolet-visible absorption, and X-ray photoemission spectroscopy to detect their unique electronic structures. [n]CPP has a cyclic structure in...

Cyclic Structure of Adenovirus DNA

Science ◽  
1965 ◽  
Vol 148 (3666) ◽  
pp. 100-102 ◽  
Author(s):  
K. O. Smith
Keyword(s):  
Cyclic Structure

Synthesis and properties of novel aliphatic polycarbonate from carbon dioxide with 1,2-butylene oxide and ɛ-caprolactone

2007 ◽  
Vol 18 (2) ◽  
pp. 209-212 ◽  
Author(s):  
Yan Fei Liu ◽  
Ke Long Huang ◽  
Dong Ming Peng ◽  
Su Qin Liu ◽  
Hong Wu
Keyword(s):  
Carbon Dioxide ◽  
Aliphatic Polycarbonate

Synthesis and properties of tunable thermoresponsive aliphatic polycarbonate copolymers with oligo ethylene glycol containing thioether and/or sulphone groups

RSC Advances ◽  
2015 ◽  
Vol 5 (80) ◽  
pp. 64832-64840 ◽  
Author(s):  
Lin Yu ◽  
Zhen Zheng ◽  
Yuan Liu ◽  
Zhao Li ◽  
Xinling Wang
Keyword(s):  
Ethylene Glycol ◽  
Aliphatic Polycarbonate

Tunable thermoresponsive aliphatic polycarbonates with oligo ethylene glycol containing thioether and/or sulphone groups.

Kinetics and Mechanism of the Aminolysis of S-Aryl O-Ethyl Dithiocarbonates in Acetonitrile

2004 ◽  
Vol 69 (12) ◽  
pp. 2174-2182 ◽  
Author(s):  
Hyuck Keun Oh ◽  
Ji Young Oh ◽  
Dae Dong Sung ◽  
Ikchoon Lee
Keyword(s):  
Transition State ◽  
Isotope Effects ◽  
Kinetic Isotope Effects ◽  
Interaction Constant ◽  
Kinetics And Mechanism ◽  
Cyclic Structure ◽  
Concerted Mechanism ◽  
Tetrahedral Intermediate ◽  
Kinetic Isotope ◽  
Hydrogen Bonded

The aminolysis of S-aryl O-ethyl dithiocarbonates with benzylamines are studied in acetonitrile at -25.0 °C. The βX (βnuc) values are in the range 0.67-0.77 with a negative cross-interaction constant, ρXZ = -0.24, which are interpreted to indicate a concerted mechanism. The kinetic isotope effects involving deuterated benzylamine nucleophiles (XC6H4CH2ND2) are large, kH/kD = 1.41-1.97, suggesting that the N-H(D) bond is partially broken in the transition state by forming a hydrogen-bonded four-center cyclic structure. The concerted mechanism is enforced by the strong push provided by the EtO group which enhances the nucleofugalities of both benzylamine and arenethiolate from the putative zwitterionic tetrahedral intermediate.

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