Cargando…
Alternating Gyroid Network Structure in an ABC Miktoarm Terpolymer Comprised of Polystyrene and Two Polydienes
The synthesis, molecular and morphological characterization of a 3-miktoarm star terpolymer of polystyrene (PS, [Formula: see text] = 61.0 kg/mol), polybutadiene (PB, [Formula: see text] = 38.2 kg/mol) and polyisoprene (PI, [Formula: see text] = 29.2 kg/mol), corresponding to volume fractions (φ) of...
Autores principales: | , , , , , , , , , , |
---|---|
Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2020
|
Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7466615/ https://www.ncbi.nlm.nih.gov/pubmed/32751589 http://dx.doi.org/10.3390/nano10081497 |
Sumario: | The synthesis, molecular and morphological characterization of a 3-miktoarm star terpolymer of polystyrene (PS, [Formula: see text] = 61.0 kg/mol), polybutadiene (PB, [Formula: see text] = 38.2 kg/mol) and polyisoprene (PI, [Formula: see text] = 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. |
---|