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A fast catalyst system for the ring-opening polymerization of cyclosiloxanes

✍ Scribed by Aart Molenberg; Martin Möller

Publisher
John Wiley and Sons
Year
1995
Tongue
English
Weight
193 KB
Volume
16
Category
Article
ISSN
1022-1336

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✦ Synopsis

Abstract

Methanol, in combination with a non‐ionic phosphazene base, was used to initiate the polymerization of octamethylcyclotetrasiloxane. In bulk, an instantaneous and large increase in viscosity was observed upon addition of the initiator. In toluene solution, the equilibrium state was reached in approximately 1 min. In addition to its high polymerization rate, another advantage of this system, as compared with e.g. alkali metal hydroxides, is that it is homogeneous.

📜 SIMILAR VOLUMES

In situ catalyst systems for ring-openin
In situ catalyst systems for ring-opening metathesis polymerization
✍ Donald R. Kelsey; Dale L. Handlin Jr.; Mysore Narayana; Betty M. Scardino 📂 Article 📅 1997 🏛 John Wiley and Sons 🌐 English ⚖ 304 KB 👁 2 views

Several new in situ tungsten catalyst systems for ring-opening metathesis polymerizations (ROMP) by reaction injection molding (RIM) have been developed by adding BF 3 promoter to binary catalyst systems, by using metal hydride cocatalysts, and by altering the ligands on the procatalyst metal center