Journal article
First observation of an ordered microphase in melts of poly(oxyethylene)-poly(oxypropylene) block copolymers
The first observation of ordered microphase structures in poly(oxyethylene)-poly(oxypropylene) diblock copolymers melts is reported. Two diblock copolymers were synthesised by anionic polymerisation, i.e. E130P58 and E107P69 where E represents an oxyethylene unit, OCH2CH2, and P an oxypropylene unit, OCH2CH(CH3).
The volume fractions of the two components were in the range 0.5-0.6. Order in the melt phase was confirmed by small angle X-ray scattering, and order-to-disorder transitions (ODT) were located at 106 degrees C (E130P58) and 114 degrees C (E107P69). In a related experiment, a triblock copolymer with perdeuterated P blocks, E(33)dP(42)E(33), was synthesised and studied in the melt phase by small-angle neutron scattering.
This allowed determination of the temperature dependence of the Flory-Huggins interaction parameter for the poly(oxyethylene)-poly(oxypropylene) system, i.e. chi = 20.2/T + 0.0221.
Language: | English |
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Year: | 2000 |
Pages: | 1503-1507 |
ISSN: | 14639084 and 14639076 |
Types: | Journal article |
DOI: | 10.1039/a909182c |
ORCIDs: | 0000-0002-8998-9390 |