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Synthesis of Amorphous Hydrophobic Telechelic Hydrocarbon Diols via ADMET Polymerization
Author(s) -
Schwendeman John E.,
Wagener Kenneth B.
Publication year - 2009
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/macp.200900270
Subject(s) - isobutylene , polymerization , polymer chemistry , acyclic diene metathesis , chemistry , telechelic polymer , polymer , depolymerization , end group , diene , cationic polymerization , hydrolysis , organic chemistry , copolymer , metathesis , natural rubber
Amorphous, hydrophobic telechelic hydrocarbon diols were synthesized using acyclic diene metathesis (ADMET) polymerization. These diols can be used in hydrolysis and UV resistant polyurethanes. The hydrocarbon backbone is based on a mimic of an ethylene/isobutylene polymer, made by the ADMET polymerization of a gem‐dimethyl substituted α , ω ‐diene followed by hydrogenation of the polymer's repeat unit unsaturation. Chain termination reactants (CTR's) having one, three, and nine methylene “spacers,” respectively, between their olefin and alcohol precursor group were used to cap the polymer chain ends to yield 2.0 functional telechelics. Use of the medium length CTR in a polymerization–depolymerization scheme, resulted in amorphous ( T g = −56 °C) telechelic diols with good molecular weight control.