The role of Tin(II) octoate - Azobisisobutyronitrile complex in the formation rate of the respective networks in simultaneous interpenetrating polymer networks

Pissis, P; Kyritsis, A; Duenas, JMM; Pradas, MM; Escuriola, DT; Ferrer, GG; Ribelles, JLG

dc.contributor.author	Pissis, P	en
dc.contributor.author	Kyritsis, A	en
dc.contributor.author	Duenas, JMM	en
dc.contributor.author	Pradas, MM	en
dc.contributor.author	Escuriola, DT	en
dc.contributor.author	Ferrer, GG	en
dc.contributor.author	Ribelles, JLG	en
dc.date.accessioned	2014-03-01T02:42:02Z
dc.date.available	2014-03-01T02:42:02Z
dc.date.issued	2001	en
dc.identifier.issn	10221360	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/30733
dc.subject.other	metal complex	en
dc.subject.other	nitrile	en
dc.subject.other	poly(methyl methacrylate)	en
dc.subject.other	polymer	en
dc.subject.other	polyurethan	en
dc.subject.other	tin derivative	en
dc.subject.other	chemical reaction	en
dc.subject.other	complex formation	en
dc.subject.other	conference paper	en
dc.subject.other	infrared spectroscopy	en
dc.subject.other	polymerization	en
dc.subject.other	reaction analysis	en
dc.title	The role of Tin(II) octoate - Azobisisobutyronitrile complex in the formation rate of the respective networks in simultaneous interpenetrating polymer networks	en
heal.type	conferenceItem	en
heal.identifier.primary	10.1002/1521-3900(200106)171:1<123::AID-MASY123>3.0.CO;2-D	en
heal.identifier.secondary	http://dx.doi.org/10.1002/1521-3900(200106)171:1<123::AID-MASY123>3.0.CO;2-D	en
heal.publicationDate	2001	en
heal.abstract	Simultaneous interpenetrating polymer networks (IPNs) based on polyether polyurethane (PUR) and poly(methyl methacrylate-co-trimethylolpropane trimethacrylate) (PMMA) were prepared in bulk at 60°C, using tin(II) octoate and azobisisobutyronitrile (AIBN) as pur polymerization catalyst and free-radical initiator, respectively. The kinetics of the PUR network formation, PMMA network formation as well as PUR/PMMA IPN formation were studied independently by Fourier transform infra-red spectroscopy. The simultaneous formation of the two networks interfered with each other, although they follow different polymerization mechanisms. Mainly two effects concerning the free-radical polymerization have been seen: a decrease of the initiation period and an earlier appearance of the Trommsdorff effect when increasing the concentration of the catalyst. On the other hand, the presence of AIBN in the reaction medium drastically reduced the catalytic efficiency of the organotin compound. An explanation of these results for this particular activating system could be the formation of a cyclic equimolar complex by coordination of the nitrile groups of AIBN with the Sn(II) atom. Complexation both reduces the effective catalyst concentration and induces steric constraints in the azo bond of AIBN, rendering this linkage weaker and more easily cleavable and allowing an early decomposition into radicals of the complexed AIBN. The maximum rate corresponds to a 1:1 complex. Further, decomposition into radicals leads to tin oxidation and formation of a new tetravalent organotin compound, the catalytic activity of which is lower than that of pure tin(II) octoate for the isocyanate-alcohol reaction.	en
heal.journalName	Macromolecular Symposia	en
dc.identifier.doi	10.1002/1521-3900(200106)171:1<123::AID-MASY123>3.0.CO;2-D	en
dc.identifier.volume	171	en
dc.identifier.spage	123	en
dc.identifier.epage	138	en