2017 (1) 2

https://doi.org/10.15407/polymerj.39.01.14

Structure and properties of crosslinked poly(bisphenol A)cyanurate modified with oligobutadiene diisocyanate

O.P. Grigoryeva, A.M. Fainleib, V.V. Grytsenko

Instutute of Macromolecular Chemistry NAS of Ukraine

48, Kharkivske shose, Kyiv 02160, Ukraine

Nezhin Mykola Gogol State University

2, Grafska Street, Nezhin 16600, Chernigov District, Ukraine

Polym. J., 2017, 39, No. 1: 14-23.

Section: Structure and properties.

Language: Russian.

Abstract:

Modification of polycyanurate network (PCN) by reactive rubber terminated with isocyanate end groups, oligobutadienediisocyanate (OIC), was studied. It has been established by using IR-spectroscopy and gel fraction content determination, that at polycyanurate network formation from dicyanate ester of bisphenol A (DCBA) in the presence of above mentioned rubber, the latter is incorporated chemically into the network structure. At that the parallel reactions of polycyclotrimerization of cyanate and isocyanate groups take place as well as their copolycyclotrimerazation with formation of combined (cyanurate-isocyanurate) heterocycles in the junctions of the hybrid PCN-OIC network. Microphase structure and morphology of the PCN-OIC hybrid networks were studied by using DMTA, DSC and SEM techniques. It has been settled that the part of the non-incorporated into the hybrid PCN-OIC network modifier increases up to 16 – 18 % with increasing the modifier content up to 30 – 40 % in the system and it forms the separate microphases. It has been revealed that two competitive processes determine the final microphase structure and properties of the PCN-OIC hybrid networks: rise of network crosslink density at increasing conversion of functional groups of the cyanate component, and increasing defectiveness of the network appeared at chemical incorporation of the modifier.

Keywords: polycyanurates, oligobutadienediisocyanate, viscoelastic properties, hybrid polymer networks, microphase structure.

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