Synthesis of Degradable Sulfur-Containing Polymers: Precise Control of Structure and Stereochemistry

2021 ◽  
Author(s):  
Tian-Jun Yue ◽  
Li-Yang Wang ◽  
Wei-Min Ren
Keyword(s):  
Sulfur Atom ◽  
Main Chain ◽  
Precise Control ◽  
Polymer Main Chain ◽  
Repeat Units ◽  
Sulfur Containing

Sulfur-containing polymers refer to the polymers contain at least one sulfur atom in their repeat units of the main-chain. The incorporation of sulfur atoms into the polymer main chain endows...

Studies on analogs of DAMASCENOLIDETM: Part 4. Synthesis and odor evaluation of sulfur-containing analogs of DAMASCENOLIDETM

2021 ◽  
Author(s):  
Yamato Miyazawa ◽  
Kenji Kawaguchi ◽  
Ryo Katsuta ◽  
Tomoo Nukada ◽  
Ken Ishigami
Keyword(s):  
Sulfur Atom ◽  
Development Project ◽  
Aroma Compounds ◽  
Odor Intensity ◽  
Aroma Compound ◽  
Odor Evaluation ◽  
Damask Rose ◽  
Sulfur Containing ◽  
Sulfur Containing Compounds

ABSTRACT DAMASCENOLIDETM [1, 4-(4-methylpent-3-en-1-yl)furan-2(5H)-one], which is isolated from damask rose, is a useful aroma compound with a citrus-like odor. We have previously reported on the synthesis and odor properties of 34 analogs of 1 as part of our new aroma compound development project. In order to develop better aroma compounds and to gather more information on structure-odor relationships, six novel sulfur-containing analogs of 1 were synthesized. Odor evaluation revealed that their odors differed significantly from those of the corresponding sulfur-free compounds. The introduction of a sulfur atom does not necessarily result in a sulfur-like odor. In particular, the 2(5H)-thiophenone analogs gave waxy, oily and lactone-like odors that are uncharacteristic of sulfur-containing compounds. In many synthesized analogs, the introduction of a sulfur atom led to an increase in odor intensity, as expected.

Synthesis and Characterization of Low Content of Structural Defects of Aryl-Substituted Electroluminescent Poly(p-phenylenevinylene)s

2001 ◽  
Vol 665 ◽  
Author(s):  
Zhi-Kuan Chen ◽  
Nancy Hoi Sim Lee ◽  
Wei Huang
Keyword(s):  
Thermal Stability ◽  
Quantum Efficiency ◽  
Defect Structure ◽  
Main Chain ◽  
Structural Defects ◽  
Synthesis And Characterization ◽  
Good Thermal Stability ◽  
H Nmr ◽  
Polymer Main Chain

ABSTRACTWe report the synthesis and characterization of a novel series of aryl-substituted PPVs, which have shown excellent processability, good thermal stability, high photoluminescence quantum efficiency and low content of structural defects. The substituents of the polymers were designed with different degree of hindrance effect on the main chain. 1H NMR measurement indicates that the defect structure in the polymer main chain can be effectively depressed by introducing bulk and hindrance substituents.

New Host-Guest Polymeric System for Thermal Stability Enhancement of Electro Optic Effect

2002 ◽  
Vol 725 ◽  
Author(s):  
Seung Koo Park ◽  
Jung Yun Do ◽  
Jung-Jin Ju ◽  
Suntak Park ◽  
Myung-Hyun Lee
Keyword(s):  
Thermal Stability ◽  
Model Compound ◽  
Main Chain ◽  
Side Chain ◽  
Hydroxyl Groups ◽  
New Host ◽  
Polymer Main Chain ◽  
Electro Optic ◽  
Chromophore Concentration ◽  
Stability Enhancement

AbstractA new host-guest electro optic (EO) polymer, in which a chromophore can be reacted with the polymer main chain during poling to give the corresponding side-chain EO polymer, has been prepared for improving EO effect and its thermal stability. Polyisoimide (PII) synthesized from 2, 2-bis (4-aminophenyl) hexafluoropropane and oxydiphthalic anhydride and Disperse Red 1 (DR1) were used as a host and a guest, respectively. A model compound reaction and Infrared spectra of the host-guest film after annealing at various temperatures show that the reaction between the isoimide groups in PII and the hydroxyl groups in DR1 occurs around 140 °C. The glass transition temperatures of the resulting EO polyamic aicd ester-imide copolymer with 0, 10, 20 and 30 wt. % of chromophore concentration were 275, 219, 160, and 124 °C, respectively. The EO coefficient obtained at a wavelength of 1.55 νm was 5.3 and 10.5 pm/V from the EO polymer film with 20 and 30 wt. % DR1. The EO signals exhibited only a slight decay at high temperature due to the chemical reaction between the host and guest during poling.

Synthesis of novel organic-soluble high-temperature aromatic polymers

1995 ◽  
Vol 7 (3) ◽  
pp. 337-345 ◽  
Author(s):  
Yoshio Imai
Keyword(s):  
Glass Transition ◽  
High Temperature ◽  
Main Chain ◽  
Phenyl Group ◽  
Current Work ◽  
Transition Temperatures ◽  
Polymer Backbone ◽  
Glass Transition Temperatures ◽  
Aromatic Polyamides ◽  
Polymer Main Chain

This paper reviews our current work on the synthesis of new organic-soluble aromatic polyamides and polyimides having high glass transition temperatures above 300 °C. Our strategy to achieve this goal is to introduce a bulky pendant phenyl group along the polymer backbone and to incorporate a crank and twisted non-coplanar structure into the polymer main chain.

The correlation between the ionic degree of covalent bond comprising polymer main chain and the ionic yield due to mechanical fracture

Polymer ◽  
2014 ◽  
Vol 55 (8) ◽  
pp. 1917-1919 ◽  
Author(s):  
Masato Sakaguchi ◽  
Masakazu Makino ◽  
Takeshi Ohura ◽  
Tadahisa Iwata
Keyword(s):  
Main Chain ◽  
Covalent Bond ◽  
Mechanical Fracture ◽  
Polymer Main Chain

Main-Chain Rotaxane Polymer (Main-Chain Polyrotaxane)

2016 ◽  
Author(s):  
Jiří Vohlídal ◽  
Edward S. Wilks ◽  
Andrey Yerin ◽  
Alain Fradet ◽  
Karl-Heinz Hellwich ◽  
...  
Keyword(s):  
Main Chain ◽  
Polymer Main Chain

Time-Resolved EPR Investigation of Potential Model Systems for Acrylate Polymer Main Chain Radicals Based on Esters of Kemp’s Tri-Acid

2009 ◽  
Vol 113 (19) ◽  
pp. 6623-6629 ◽  
Author(s):  
Natalia V. Lebedeva ◽  
Elena V. Gorelik ◽  
Damaris Magnus-Aryitey ◽  
Terence E. Hill ◽  
Malcolm D. E. Forbes
Keyword(s):  
Potential Model ◽  
Main Chain ◽  
Model Systems ◽  
Time Resolved ◽  
Polymer Main Chain ◽  
Acrylate Polymer
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