Kinetics of curing of unsaturated polyesters in the presence of organic and inorganic fillers

Simitzis, J; Stamboulis, A; Tsoros, D; Martakis, N

dc.contributor.author	Simitzis, J	en
dc.contributor.author	Stamboulis, A	en
dc.contributor.author	Tsoros, D	en
dc.contributor.author	Martakis, N	en
dc.date.accessioned	2014-03-01T01:13:06Z
dc.date.available	2014-03-01T01:13:06Z
dc.date.issued	1997	en
dc.identifier.issn	0959-8103	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/12332
dc.subject	Curing	en
dc.subject	Inorganic fillers	en
dc.subject	Kinetics	en
dc.subject	Olive stones	en
dc.subject	Unsaturated polyesters	en
dc.subject.classification	Polymer Science	en
dc.subject.other	Activation energy	en
dc.subject.other	Chemical bonds	en
dc.subject.other	Composition effects	en
dc.subject.other	Crosslinking	en
dc.subject.other	Curing	en
dc.subject.other	Differential scanning calorimetry	en
dc.subject.other	Macromolecules	en
dc.subject.other	Plastics fillers	en
dc.subject.other	Quartz	en
dc.subject.other	Reaction kinetics	en
dc.subject.other	Rheology	en
dc.subject.other	Talc	en
dc.subject.other	Olive stones	en
dc.subject.other	Polyesters	en
dc.title	Kinetics of curing of unsaturated polyesters in the presence of organic and inorganic fillers	en
heal.type	journalArticle	en
heal.identifier.primary	10.1002/(SICI)1097-0126(199708)43:4<380::AID-PI816>3.0.CO;2-3	en
heal.identifier.secondary	http://dx.doi.org/10.1002/(SICI)1097-0126(199708)43:4<380::AID-PI816>3.0.CO;2-3	en
heal.language	English	en
heal.publicationDate	1997	en
heal.abstract	The curing of unsaturated polyesters in the presence of organic and inorganic fillers was studied by rheology and differential scanning calorimetry (DSC). A commercial resin was used as unsaturated polyester and pressed olive stones, which are an agricultural by-product, talc and quartz in different concentrations were used as fillers. The viscosity versus time at different temperatures was recorded and the gel time (G) was determined by the sharp increase of viscosity, which involves the beginning of the crosslinking reaction. DSC records the exothermic peak due to the double bonds breaking to give crosslinked macromolecules. The results of both methods were treated kinetically. The activation energy E-v and the pre-exponential factor A' from the rheological method remained almost constant in the case of talc and quartz compared with the neat unsaturated polyester. With pressed olive stones as filler, both parameters increased. On the other hand. the DSC results for the resins with inorganic and organic fillers showed a decreased activation energy E-a,E-D and frequency factor k(o,D) compared with the neat unsaturated polyester, whose activation energy E-a,E-D. and frequency factor k(o,D) were calculated to be 23.5 kcal mol(-1) and 9.5 x 10(9) s(-1), respectively. The order of reaction was calculated to be close to 1, The olive stones influenced the curing reaction, acting as an auxiliary accelerator.	en
heal.publisher	JOHN WILEY & SONS LTD	en
heal.journalName	Polymer International	en
dc.identifier.doi	10.1002/(SICI)1097-0126(199708)43:4<380::AID-PI816>3.0.CO;2-3	en
dc.identifier.isi	ISI:A1997XQ12100014	en
dc.identifier.volume	43	en
dc.identifier.issue	4	en
dc.identifier.spage	380	en
dc.identifier.epage	384	en