Multiarm star poly(glycidol)-block-poly(e-caprolactone) of different arm lengths and their use as modifiers of diglycidylether of bisphenol a thermosets
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hdl:2117/12785
Tipus de documentArticle
Data publicació2011-01-01
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Abstract
Well-defined multiarm star copolymers, hyperbranched
poly(glycidol)-b-poly(e-caprolactone), with an average
of 100–110 arms per molecule and a molecular weight of arms
of 3000 g/mol (PGOH-b-PCL30) and 1000 g/mol (PGOH-b-PCL10)
were synthesized by cationic ring-opening polymerization of ecaprolactone
from a poly(glycidol) core and used to modify
diglycidylether of bisphenol A formulations. The curing process,
studied by dynamic scanning calorimetry, was only
slightly retarded when PGOH-b-PCLx were added to the formulation.
By rheometry, the effect of this new topology and the
arm length on the complex viscosity (g*) and gelation of the
reactive mixture was analyzed in detail. The addition of these
new reactive modifiers decreases the global shrinkage and
increases the conversion at gelation. In addition, the modified
thermosets have an improved reworkability. The homogeneity
of pure DGEBA and modified thermosets was proved by
dynamic thermomechanical analysis and electronic microscopy
(FESEM). Addition of star-like structures led to a more toughened
fracture of the thermoset in comparison to pure DGEBA.
CitacióMorell, M. [et al.]. Multiarm star poly(glycidol)-block-poly(e-caprolactone) of different arm lengths and their use as modifiers of diglycidylether of bisphenol a thermosets. "Journal of polymer science. Part A, polymer chemistry", 01 Gener 2011, vol. 49, núm. 11, p. 2395-2406.
ISSN0887-624X
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