Linear polymers with sulfur in the main chain. II. Synthesis of polyesters by interfacial polycondensation of bis(4,4?-hydroxyphenyl)sulfide with several aliphatic acid dichlorides and their properties

2003 ◽  
Vol 91 (3) ◽  
pp. 1865-1872 ◽  
Author(s):  
Hiroshi Hirano ◽  
Seiji Watase ◽  
Mitsuaki Tanaka
Keyword(s):  
Main Chain ◽  
Aliphatic Acid ◽  
Linear Polymers ◽  
Interfacial Polycondensation

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.

Main-chain sulphur containing water soluble poly(N-isopropylacrylamide-co-N,N′-dimethylacrylamide sulphide) copolymers via interfacial polycondensation

Polymer ◽  
2014 ◽  
Vol 55 (22) ◽  
pp. 5656-5664 ◽  
Author(s):  
Ujjal Haldar ◽  
Latha Ramakrishnan ◽  
Kannan Sivaprakasam ◽  
Priyadarsi De
Keyword(s):  
Main Chain ◽  
Water Soluble ◽  
Interfacial Polycondensation ◽  
Soluble Poly
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