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Synthesis of End‐Functionalized Star‐Shaped Poly(methylthiirane)s
Author(s) -
Nicol Erwan,
BonnansPlaisance Chantal,
Dony Philippe,
Levesque Guy
Publication year - 2001
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/1521-3935(20011001)202:14<2843::aid-macp2843>3.0.co;2-n
Subject(s) - polymer chemistry , polymer , polymerization , molar mass , chemistry , macromolecule , lithium (medication) , end group , lithium aluminium hydride , anionic addition polymerization , organic chemistry , medicine , biochemistry , endocrinology
Star‐shaped poly(methylthiirane)s were prepared by ring‐opening polymerization of methylthiirane with thiolate ions as initiators. As expected, the “ arm first method” using 1,2,4,5‐tetrakis(bromomethyl) benzene as a linking agent gave mixtures of tetra‐, (tri) and di‐armed polymers. The “ core first method” with tri‐ and tetra‐thiols as core components seemed to be a better method and gave polymers of different molar masses, varying from 800 to 60 000 g·mol –1 with narrow polymolecularity indices; but the presence of macromolecular disulfides – formed by oxidation of the thiolate ions – broaden the molar distribution. These disulfides could be reduced with lithium aluminium hydride. The star polymers could be end‐capped with various functional groups through reaction of the thiolate end groups, either at the end of the polymerization or after acid regeneration from the thiol polymers.