19576-37-5Relevant academic research and scientific papers
Preparation method of cationic polymerization bifunctional initiator and telechelic polyisobutene
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, (2017/09/18)
The invention discloses a preparation method of a novel cationic polymerization bifunctional initiator. The initiator is produced to a kilo grade scale meeting industrial production from a laboratory gram-grade scale, so that the synthetic cost of the initiator is greatly lowered. By developing a series of novel initiator derivatives, the brand new initiator which is higher in initiating efficiency, lower in energy consumption and higher in production efficiency are found, and telechelic polyisobutene, the functional groups (hydroxyl, double bonds or chlorine group) of which are fully terminated and the molecular structure of which is controllable, can be synthesized.
METHOD FOR THE SYNTHESIS OF INITIATORS FOR TELECHELIC POLYISOBUTYLENES
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Page/Page column 15-16, (2012/07/27)
A new methodology for the synthesis of a novel difunctional- and a known trifunctional initiator, i.e., 1,3-di(2-methoxy-2-propyl)-5-isopropyl benzene and 1,3,5-tri(2-methoxy-2-propyl) benzene, respectively, for the preparation of di- and tri-telechelic polyisobutylenes. The synthesis proceeds in three steps: 1) catalytic peroxidation of 1,3,5-triisopropylbenzene, 2) reduction of the peroxides to the corresponding alcohols, and 3) methylation of the alcohols. By controlling the conversion of the key peroxidation step the relative ratio of di- and tri-fiinctional intermediates can be controlled. By the use of the 1,3-di(2-methoxy-2-propyl)-5-isopropyl-benzene, well-defined di-methoxy telechelic polyisobutylenes can be synthesized. Although the overall combined yield of the two initiators was only 14-20%, because of the low cost of the starting material, reagents used, and simple manipulations these compounds represent the most cost effective initiators to-date for the preparation of telechelic polyisobutylenes.
