Abstract
AbstractThe mechanism of anionic polymerization of acrylates and methacrylates was studied by differential thermometry. The course of the temperature curves after the addition of the initiator to the monomer was analyzed. As initiator, organolithium and sodium compounds as well as lithium, sodium, and potassium tert. alkoxides were used. It was found that in case of methacrylates the lifetime of growing chains is according to the type of the initiator and monomer from seconds to about 1 min. In the case of lithium alkoxide, formation of active centers is a relatively slow process, different from potassium alkoxide, where the whole process resembles polymerization by organometallic compounds. Sodium alkoxide initiator evidently causes a very complicated process. After the region of acceleration is reached, polymerization resembles potassium alkoxide initiation. In the case of lithium compounds the high isotactic portion depends on the alkoxide present, whereas with sodium compounds, atactic polymer is normally obtained. Potassium alkoxide leads to slightly increased syndiotactic portion.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Journal of Polymer Science Part C: Polymer Symposia
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
