Linear polymers with sulfur in the main chain, I . Polyesters derived from interfacial polycondensation of 4,4′-thiodiphenol and/or bisphenol-A with adipoyl dichloride

1999 ◽  
Vol 267 (1) ◽  
pp. 57-62 ◽  
Author(s):  
Hiroshi Hirano ◽  
Mitsuaki Tanaka
Keyword(s):  
Bisphenol A ◽  
Main Chain ◽  
Linear Polymers ◽  
Interfacial Polycondensation

Organic solvent-free synthesis of phosphorus-containing polymers

2007 ◽  
Vol 79 (11) ◽  
pp. 1879-1884 ◽  
Author(s):  
Smaranda Iliescu ◽  
Gheorghe Ilia ◽  
Aurelia Pascariu ◽  
Adriana Popa ◽  
Nicoleta Plesu
Keyword(s):  
Thermal Stability ◽  
Thermal Analysis ◽  
Bisphenol A ◽  
Organic Solvent ◽  
Molar Mass ◽  
Interfacial Polycondensation ◽  
H Nmr ◽  
Phosphorus Containing ◽  
Solvent Free Synthesis ◽  
Thermal Stability Of

Direct, efficient, organic solvent- and catalyst-free synthesis of a series of polyphosphates was accomplished. The reaction involved a gas-liquid interfacial polycondensation between arylphosphoric dichlorides and bisphenol A. The polyphosphates were characterized by IR, 1H NMR, 31P NMR, inherent viscosity, thermal analysis, and molar mass. Yields in the range 70-90 % and inherent viscosities in the range 0.30-0.40 dl/g were obtained. The thermal stability of the polyphosphates was investigated by using thermogravimetry.

The study of the vapor-liquid interfacial polycondensation of the cyclohexylphosphonic dichloride with bisphenol A

2001 ◽  
Vol 46 (2-3) ◽  
pp. 165-174 ◽  
Author(s):  
Smaranda Iliescu ◽  
Gheorghe Ilia ◽  
Adriana Popa ◽  
Gheorghe Dehelean ◽  
Lavinia Macarie ◽  
...  
Keyword(s):  
Bisphenol A ◽  
Interfacial Polycondensation ◽  
Vapor Liquid

Highly transparent and organosoluble polyimides derived from 2,2′-bis[4-(5-amino-2-pyridinoxy) phenyl] propane

2016 ◽  
Vol 29 (2) ◽  
pp. 161-169 ◽  
Author(s):  
Zhun Li ◽  
Yang Wen ◽  
Ying Wang ◽  
Shaomin Zhu
Keyword(s):  
Optical Properties ◽  
Bisphenol A ◽  
Potassium Carbonate ◽  
Pyridine Ring ◽  
Main Chain ◽  
Step Method ◽  
Nucleophilic Reaction ◽  
The Impact

Two new isomers containing pyridine ring diamine monomers, 2,2′-bis[4-(5-amino-2-pyridinoxy)phenyl] propane (1b) and 2,2′-bis[4-(6-amino-3-pyridinoxy)phenyl] propane (2b), were prepared via a simple nucleophilic reaction of 2-chloro-5-nitropyridine and 5-bromo-2-nitropyridine with bisphenol A in the presence of potassium carbonate, respectively. A series of polyimides (PIs) were obtained from the heterocyclic diamine with various commercially available aromatic dianhydrides via the conventional two-step method. These obtained PIs were investigated in aspects of their solubility, thermal, mechanical, and optical properties for studying the effects of the heteroaromatic rings into the main chain. At the same time, the impact of the two isomers introduced into the PI was discussed in detail.

scholarly journals Effect of Side Groups on the Hydrolytic Stability of Thiolated and Disulfide Cross-linked Polyaspartamides

2021 ◽  
Vol 65 (2) ◽  
pp. 183-191
Author(s):  
Benjámin Gyarmati ◽  
Aysel Mammadova ◽  
Gergely Stankovits ◽  
Dóra Barczikai ◽  
András Szilágyi
Keyword(s):  
Nmr Spectroscopy ◽  
1H Nmr Spectroscopy ◽  
Chemical Structure ◽  
Main Chain ◽  
Hydrolytic Stability ◽  
Linear Polymers ◽  
Dynamic Moduli ◽  
Oscillatory Rheology ◽  
Thiol Content ◽  
Biomedical Fields

Thiolated polyaspartamides either with N,N-dimethyl-2-aminoethyl (DME), N,N-dimethyl-3-aminopropyl (DMP) or 2-hydroxyethyl (HE) side groups were synthesized to study the effect of side groups on the hydrolytic stability of these polymers. The chemical structure of linear polymers was confirmed by 1H NMR spectroscopy, while thiol content was determined by Ellman's assay. Hydrolytic stability of thiolated polyaspartamides was studied by viscosity measurements and results suggested main-chain degradation in the presence of DME side groups. Polyaspartamides with DMP or HE side groups showed considerable stability. Thiolated polyaspartamides were converted to their disulfide cross-linked hydrogels and the gelation process was followed by oscillatory rheology. Time-dependence of dynamic moduli indicated the degradation of hydrogels containing DME side groups, while stable moduli were observed for hydrogels containing DMP or HE side groups. This structure-dependent aqueous degradation of polyaspartamides can be useful in different biomedical fields.

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