Crosslinking of Electrospun Fibres from Unsaturated Polyesters by Bis-Triazolinediones (TAD)

Autor: Viviane Chiaradia, Scott D. Kimmins, Saltuk B. Hanay, Débora de Oliveira, Pedro Henrique Hermes de Araújo, Claudia Sayer, Andreas Heise
Jazyk: angličtina
Rok vydání: 2019
Předmět:
Zdroj: Polymers
Volume 11
Issue 11
Polymers, Vol 11, Iss 11, p 1808 (2019)
ISSN: 2073-4360
Popis: Crosslinking of an unsaturated aliphatic polyester poly(globalide) (PGl) by bistriazolinediones (bisTADs) is reported. First, a monofunctional model compound, phenyl&ndash
TAD (PTAD), was tested for PGl functionalisation. 1H-NMR showed that PTAD&ndash
ene reaction was highly efficient with conversions up to 97%. Subsequently, hexamethylene bisTAD (HM&ndash
bisTAD) and methylene diphenyl bisTAD (MDP&ndash
bisTAD) were used to crosslink electrospun PGl fibres via one- and two-step approaches. In the one-step approach, PGl fibres were collected in a bisTAD solution for in situ crosslinking, which resulted in incomplete crosslinking. In the two-step approach, a light crosslinking of fibres was first achieved in a PGl non-solvent. Subsequent incubation in a fibre swelling bisTAD solution resulted in fully amorphous crosslinked fibres. SEM analysis revealed that the fibres&rsquo
morphology was uncompromised by the crosslinking. A significant increase of tensile strength from 0.3 ±
0.08 MPa to 2.7 ±
0.8 MPa and 3.9 ±
0.5 MPa was observed when PGI fibres were crosslinked by HM&ndash
bisTAD and MDP&ndash
bisTAD, respectively. The reported methodology allows the design of electrospun fibres from biocompatible polyesters and the modulation of their mechanical and thermal properties. It also opens future opportunities for drug delivery applications by selected drug loading.
Databáze: OpenAIRE
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