@Article{JPM.2020.37.1-2.6,
AUTHOR = {YAN WANG, LI-FANG ZHANG, XIAO-QI WANG},
TITLE = {Anionic Polymerization of ε-Caprolactone Using Potassium <i>tert</i>-Butoxide/18-Crown-6 Initiating System},
JOURNAL = {Journal of Polymer Materials},
VOLUME = {37},
YEAR = {2020},
NUMBER = {1-2},
PAGES = {77--89},
URL = {http://www.techscience.com/jpm/v37n1-2/56060},
ISSN = {0976-3449},
ABSTRACT = {The effect of 18-crown-6 ether (18C6) on the anionic polymerization of ε-caprolactone (ε -CL)
using potassium tert-butoxide (t-BuOK) as the initiator was studied. The experimental results
showed that 18C6 in combination with t-BuOK exhibited high selectivity for ring opening relative
to trans-esterification and improved control toward the ROP of ε-CL, producing poly(ε-
caprolactone) (PCL) with much higher molecular weight and relatively narrow distribution compared
to those using t-BuOK alone as the initiator.The influences of reaction conditions, such as
monomer concentration, monomer/initiator molar ratio, and [18C6]/[t-BuOK] molar ratio, as well
as reaction temperature and time on the polymerization have been examined in detail. The
resulting hopolymers were characterized by various analytical techniques, such as GPC, FTIR,
<sup>1</sup>
H NMR, DSC, TGA, and MALDI-ToF MS, to monitor the structures and property changes of
PCLs.},
DOI = {10.32381/JPM.2020.37.1-2.6}
}