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Block copolymers of polyacetals
Author(s) -
Franta E.,
Refai J.,
Durand C.,
Reibel L.
Publication year - 1990
Publication title -
makromolekulare chemie. macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 0258-0322
DOI - 10.1002/masy.19900320115
Subject(s) - copolymer , diol , polymerization , polymer chemistry , condensation polymer , block (permutation group theory) , dioxolane , acetal , catalysis , materials science , chemistry , organic chemistry , polymer , mathematics , geometry
The polymerization of 1,3‐dioxolane was carried out using trifluoromethanesulfonic acid (triflic acid) as catalyst, in the presence of an oligomeric diol, α‐hydro‐ω‐hydroxypoly(oxyethylene) (PEOG) or α‐hydro‐ω‐hydroxypoly(oxytetramethylene) (poly‐THF‐diol). When PEOG was used, a linear increase of the number average molecular weight versus conversion was observed. A triblock copolymer was obtained as well as small cycles in their usual equilibrium concentration. When poly‐THF‐diol was used, fast transacetalization provoked the “polycondensation” of the diol through acetal linkages at the very onset of the reaction, leading to a very inhomogeneous mixture. After equilibrium was reached, through reactions involving all the various species present, a triblock copolymer was also obtained. In conclusion, this method is well suited to prepare α,ω‐diol block copolymers in which the initial oligomeric diol constitutes the center block, while the outside blocks are made of polyacetal.