By Yuri N. Khakimullin, Vladimir S. Minkin, Timur R. Deberdeev, Gennady E. Zaikov
This worthy e-book is dedicated to difficulties of the synthesis, vulcanization, amendment, and research of constitution and homes of hugely crammed sealants in response to polysulfide oligomers (PSO). The e-book summarizes info pertaining to chemistry, synthesis know-how, constitution, and houses of liquid thiokols and thiokol-containing polyesters. It additionally provides a literary survey on chemism and mechanisms for liquid thiokols vulcanization related to oxidants or via polyaddition. The booklet describes formula rules of sealants, their houses, and alertness areas.
The publication offers examine on vulcanization and amendment of thiokol sealants regarding thiokol-epoxy resin copolymers, unsaturated polyesters, and diverse isocyanate prepolymers. It describes experiences of mechanisms underlying vulcanization of polysulphide oligomers via manganese dioxide, sodium dichromate and zinc oxide, and likewise of the constitution and houses of sealants at the foundation of a liquid thiokol and advertisement “ТПМ-2” polymer reckoning on a chemical nature and the ratio of constituent oligomers. The ebook offers info at the impact of filling fabrics on vulcanization kinetics, rheological, and physico–mechanical houses of sealants counting on the character of PSO.
The booklet can be of curiosity to analyze group of workers of medical institutes and facilities constructing reactive oligomers and their compositions and learning their constitution and homes in addition to engineers operating in technology facilities or businesses operating within the zone of improvement, construction, and alertness of polysulfide oligomers and sealants.
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Additional resources for Polysulfide oligomer sealants : synthesis, properties, and applications
It is explained by a relatively high mobility of hydrogen atoms, causing conjugation of unpaired electrons of electronegative sulfur atoms in HS– and SСH2 groups with highest valent orbitals of sulfur atoms in free molecules. The presence of free sulfur atoms, adsorbed along oligomer’s chain, leads to a substantial decrease of sulfur atoms’ electronic cloud density and the mobility of HS-protons, comparing oligomers with less content of free sulfur. It can mainly explain the increase of PSO’s reactivity if few free sulfur atoms are introduced, that would increase the activity of mercaptan groups during curing of oligomers.
Industrial grade vulcanizing agents have the following row of activity [2, 4, 16, 17]: PbO2> Na2Cr2O7> MnO2 Systems with manganese dioxide are more preferable as their parameters of network formation are optimal. However, vulcanizates with sodium bichromate demonstrate higher mechanical, adhesion and cohesion properties, than vulcanizates, produced with metal dioxides. 1). They are also cost-effective and ecofriendly [1, 2, 4]. End SH-groups of oligomer are oxidized by manganese dioxide, form disulfide bonds and release water in the following common reaction [1, 18]: 2~R-SH + MnO2 ~R-S-S-R~ + MnO + H2O The question of oxidation mechanism (either ionic or radical) is still open.
Suhanov, P. , Averko-Antonovich, L. , Minkin, V. , & Kostochko, A. , (1996). Zhurnal prikladnojhim ii (in Russian). 69(1) 124–126. Suhanov, P. , Khakimullin, Yu. , Averko-Antonovich, L. , & Minkin, V. S. (1994). Transactions of International Conference on Caoutchouc and Rubber (in Russian), Moscow, Vol. 3, 152–158. 15. , & Kucharski, M. (1985). Przem. Chem. 64(3), 129–131. 16. Dachselt, Thioplaste, Leipzig, (1971), 164. 17. Patent 3046516, FRG (Germany) C07 C149/05, (1981). 18. Patent 2073032, Russia, C08, G75/16, C08K 3/30.