Structure and dynamic/compositional heterogeneity in polycyanurate - Poly(tetramethylene glycol) hybrid networks

Bershtein, VA; Egorov, VM; Yakushev, PN; David, L; Fainleib, AM; Grigorieva, OP; Bei, I; Kripotou, S; Pissis, P

dc.contributor.author	Bershtein, VA	en
dc.contributor.author	Egorov, VM	en
dc.contributor.author	Yakushev, PN	en
dc.contributor.author	David, L	en
dc.contributor.author	Fainleib, AM	en
dc.contributor.author	Grigorieva, OP	en
dc.contributor.author	Bei, I	en
dc.contributor.author	Kripotou, S	en
dc.contributor.author	Pissis, P	en
dc.date.accessioned	2014-03-01T01:27:19Z
dc.date.available	2014-03-01T01:27:19Z
dc.date.issued	2007	en
dc.identifier.issn	0022-2348	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/18396
dc.subject	Dynamic heterogeneity	en
dc.subject	Hybrid networks	en
dc.subject	Structure	en
dc.subject.classification	Polymer Science	en
dc.subject.other	Creep resistance	en
dc.subject.other	Crosslinking	en
dc.subject.other	Depolarization	en
dc.subject.other	Differential scanning calorimetry	en
dc.subject.other	Esters	en
dc.subject.other	Laser interferometry	en
dc.subject.other	Phenols	en
dc.subject.other	X ray diffraction	en
dc.subject.other	X ray scattering	en
dc.subject.other	Depolarization currents	en
dc.subject.other	Dicyanate esters	en
dc.subject.other	Dynamic heterogeneity	en
dc.subject.other	Hybrid networks	en
dc.subject.other	Noncrystalline structure	en
dc.subject.other	Polyethylene glycols	en
dc.title	Structure and dynamic/compositional heterogeneity in polycyanurate - Poly(tetramethylene glycol) hybrid networks	en
heal.type	journalArticle	en
heal.identifier.primary	10.1080/00222340601044433	en
heal.identifier.secondary	http://dx.doi.org/10.1080/00222340601044433	en
heal.language	English	en
heal.publicationDate	2007	en
heal.abstract	Structure and dynamics over the range from -150 to 300 degrees C were studied in a series of polycyanurate-poly(tetramethylene glycol) (PCN-PTMG) hybrid networks. Wide-angle x-ray diffraction (WAXD), small-angle x-ray scattering (SAXS), laser-interferometric creep rate spectroscopy (CRS), differential scanning calorimetry (DSC), and thermally stimulated depolarization currents (TSDC) techniques were applied. The networks were synthesized from the dicyanate ester of bisphenol A (DCEBA) and hydroxyl-terminated PTMG with M-n = 1000, 2000 or 5000 g/mol and weight fraction of 10, 20, 30, and 40%. The noncrystalline structure and the pronounced structural nanoheterogeneity, depending on PTMG chain length and PCN-PTMG ratio in the hybrid systems, were evidenced. Combined CRS/DSC analysis revealed a complex dynamics in these networks, in particular a dispersion of glass transitions in a wide temperature range. On this basis, the presence of nanodomains with different degrees of rigid cross-linking (X-CN -> PCN), i.e., compositional nanoheterogeneity in these hybrids was shown. The results obtained turned out to be of applied interest because of a substantial increase in tensile strength because of arising microplasticity at low temperatures, and retaining some creep resistance, at low stresses, up to temperatures much higher the basic T-g.	en
heal.publisher	TAYLOR & FRANCIS INC	en
heal.journalName	Journal of Macromolecular Science, Part B: Physics	en
dc.identifier.doi	10.1080/00222340601044433	en
dc.identifier.isi	ISI:000243498000016	en
dc.identifier.volume	46 B	en
dc.identifier.issue	1	en
dc.identifier.spage	207	en
dc.identifier.epage	230	en