Synthesis of Well-Defined Telechelic Aromatic Polyamides by Chain-Growth Polycondensation: Application to the Synthesis of Block Copolymers of Polyamide and Poly(tetrahydrofuran)

2003 ◽  
Vol 24 (18) ◽  
pp. 1085-1090 ◽  
Author(s):  
Ryuji Sugi ◽  
Akihiro Yokoyama ◽  
Tsutomu Yokozawa
Keyword(s):  
Block Copolymers ◽  
Chain Growth ◽  
Aromatic Polyamides

Synthesis of well-defined poly(p-benzamide) from chain-growth polycondensation and its application to block copolymers

2003 ◽  
Vol 199 (1) ◽  
pp. 187-196 ◽  
Author(s):  
Tsutomu Yokozawa ◽  
Miyuki Ogawa ◽  
Atsushi Sekino ◽  
Ryuji Sugi ◽  
Akihiro Yokoyama
Keyword(s):  
Block Copolymers ◽  
Chain Growth

Inductive Effect-Assisted Chain-Growth Polycondensation. Synthetic Development frompara-tometa-Substituted Aromatic Polyamides with Low Polydispersities

2005 ◽  
Vol 127 (29) ◽  
pp. 10172-10173 ◽  
Author(s):  
Ryuji Sugi ◽  
Akihiro Yokoyama ◽  
Taniyuki Furuyama ◽  
Masanobu Uchiyama ◽  
Tsutomu Yokozawa
Keyword(s):  
Inductive Effect ◽  
Chain Growth ◽  
Aromatic Polyamides

scholarly journals Synthesis and Properties of Multi-Block Copolymers Based on Polybutadiene and Aromatic Polyamides Having Unsymmetrical Structures

1985 ◽  
Vol 17 (8) ◽  
pp. 935-941 ◽  
Author(s):  
Shin-ichi Ogata ◽  
Hiroyuki Maeda ◽  
Masa-aki Kakimoto ◽  
Yoshio Imai
Keyword(s):  
Block Copolymers ◽  
Aromatic Polyamides

Formation of polymer vesicles by simultaneous chain growth and self-assembly of amphiphilic block copolymers

2009 ◽  
pp. 2887 ◽  
Author(s):  
Guillaume Delaittre ◽  
Charlotte Dire ◽  
Jutta Rieger ◽  
Jean-Luc Putaux ◽  
Bernadette Charleux
Keyword(s):  
Block Copolymers ◽  
Self Assembly ◽  
Amphiphilic Block Copolymers ◽  
Chain Growth ◽  
Polymer Vesicles

Self-initiated Chain-growth Polycondensation for Aromatic Polyamides

2004 ◽  
Vol 33 (3) ◽  
pp. 272-273 ◽  
Author(s):  
Tsutomu Yokozawa ◽  
Ryuji Sugi ◽  
Toshinobu Asai ◽  
Akihiro Yokoyama
Keyword(s):  
Chain Growth ◽  
Aromatic Polyamides

scholarly journals Synthesis and Properties of Bioresorbable Block Copolymers of l-Lactide, Glycolide, Butyl Succinate and Butyl Citrate

Polymers ◽  
2020 ◽  
Vol 12 (1) ◽  
pp. 214 ◽  
Author(s):  
Natalia Śmigiel-Gac ◽  
Elżbieta Pamuła ◽  
Małgorzata Krok-Borkowicz ◽  
Anna Smola-Dmochowska ◽  
Piotr Dobrzyński
Keyword(s):  
Molecular Weight ◽  
Block Copolymers ◽  
Biomedical Applications ◽  
Chain Growth ◽  
Hydroxyl Groups ◽  
Butylene Succinate ◽  
Branched Copolymers ◽  
Ultrahigh Molecular Weight ◽  
Biological Tests ◽  
Polymerization Mixture

The paper presents the course of synthesis and properties of a series of block copolymers intended for biomedical applications, mainly as a material for forming scaffolds for tissue engineering. These materials were obtained in the polymerization of l-lactide and copolymerization of l-lactide with glycolide carried out using a number of macroinitiators previously obtained in the reaction of polytransesterification of succinic diester, citric triester and 1,4-butanediol. NMR, FTIR and DSC were used to characterize the materials obtained; wettability and surface free energy were assessed too. Moreover, biological tests, i.e., viability and metabolic activity of MG-63 osteoblast-like cells in contact with synthesized polymers were performed. Properties of obtained block copolymers were controlled by the composition of the polymerization mixture and by the composition of the macroinitiator. The copolymers contained active side hydroxyl groups derived from citrate units present in the polymer chain. During the polymerization of l-lactide in the presence of polyesters with butylene citrate units in the chain, obtained products of the reaction held a fraction of highly branched copolymers with ultrahigh molecular weight. The reason for this observed phenomenon was strong intermolecular transesterification directed to lactidyl side chains, formed as a result of chain growth on hydroxyl groups related to the quaternary carbons of the citrate units. Based on the physicochemical properties and results of biological tests it was found that the most promising materials for scaffolds formation were poly(l-lactide–co–glycolide)–block–poly(butylene succinate–co–butylene citrate)s, especially those copolymers containing more than 60 mol % of lactidyl units.

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