Synthesis and characterization of poly(copolyethers-block-polyamides) II. Characterization and properties of the multiblock copolymers

Citation
A. Boulares et al., Synthesis and characterization of poly(copolyethers-block-polyamides) II. Characterization and properties of the multiblock copolymers, POLYMER, 41(10), 2000, pp. 3561-3580
Citations number
32
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Organic Chemistry/Polymer Science
Journal title
POLYMER
ISSN journal
0032-3861 → ACNP
Volume
41
Issue
10
Year of publication
2000
Pages
3561 - 3580
Database
ISI
SICI code
0032-3861(200005)41:10<3561:SACOPI>2.0.ZU;2-T
Abstract
Multiblock copolymers were synthesized from an alpha,w-dicarboxy-oligododec anamide (PA12dC; (M) over bar(n) = 2095) and various alpha,w-dihydroxypolye thers ((M) over bar(n) = 1000-2000), especially, as copolyethers containing both polyoxyethylene and polyoxypropylene blocks. The polycondensation rea ction was carried out in bulk at high temperature in the presence of Zr(OBu )(4) as catalyst. A kinetic study permitted one to compare the reactivity o f the different oligoethers used with respect to PA12dC. The thermal proper ties, the structure and morphology of these poly(polyethers-block-polyamide s) were characterized by DSC, TGA, DMA and solid-state C-13 NMR. DSC and DM A results show that the multiblock copolymers based on copolyethers exhibit a very high degree of phase separation and these soft blocks do not crysta llize, whatever their length and composition. NMR results reveal that the c rystalline polyamide phase adopts a structure (gamma-form) similar to that of the oligoamide precursor. (C) 2000 Elsevier Science Ltd. All rights rese rved.