Alternating gyroid network structure in an ABC Miktoarm terpolymer comprised of polystyrene and two polydienesстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 16 декабря 2020 г.
Аннотация:The synthesis, molecular and morphological characterization of a 3-miktoarm star terpolymer of polystyrene (PS, M n = 61.0 kg/mol), polybutadiene (PB, M n = 38.2 kg/mol) and polyisoprene (PI, M n = 29.2 kg/mol), corresponding to volume fractions (ϕ) of 0.46, 0.31 and 0.23 respectively, was studied. The major difference of the present material from previous ABC miktoarm stars (which is a star architecture bearing three different segments, all connected to a single junction point) with the same block components is the high 3,4-microstructure (55%) of the PI chains. The interaction parameter and the degree of polymerization of the two polydienes is sufficiently positive to create a three-phase microdomain structure as evidenced by differential scanning calorimetry and transmission electron microscopy (TEM). These results in combination with small-angle X-ray scattering (SAXS) and birefringence experiments suggest a cubic tricontinuous network structure, based on the I4 1 32 space group never reported previously for such an architecture.