Effects of SBS on phase morphology of iPP/aPS blends /
The supermolecular structure of binary isotactic polypropylene/poly(styrene-b-butadiene-b-styrene) (iPP/SBS) and isotactic polypropylene/atactic polystyrene (iPP/aPS) compression molded blends and that of ternary iPP/aPS/SBS blends were studied by optical microscopy, scanning andtransmission electro...
Shranjeno v:
| Main Authors: | , |
|---|---|
| Format: | Book Chapter |
| Jezik: | English |
| Teme: | |
| Sorodne knjige/članki: | Vsebovano v:
Polymer engineering and science |
| Oznake: |
Označite
Brez oznak, prvi označite!
|
| Izvleček: | The supermolecular structure of binary isotactic polypropylene/poly(styrene-b-butadiene-b-styrene) (iPP/SBS) and isotactic polypropylene/atactic polystyrene (iPP/aPS) compression molded blends and that of ternary iPP/aPS/SBS blends were studied by optical microscopy, scanning andtransmission electron microscopy, wide-angle X-ray diffraction and differential scanning calorimetry. Nucleation, crystal growth, solidification and blend phase morphology are affected by the addition of amorphous components (SBS and aPS). As a compatibilizer in immiscible iPP/aPS blends, SBS formed interfacial layer between dispersed honeycomb-like a PS/SBS particles and the iPP matrix, thus influencing the crystallization process in iPP. The amount of SBS and aPS, compatibilizing efficiency of SBS, determine the size of dispersed aPS, SBS, and aPS/SBS particles and, consequetly, the final blend phase morphologies: well-developed spherulitic morphology, cross-hatched structure with blocks of sandwich lamellae and co-continuous morphology. The analysis of the relationship between the size of spherulities and dispersed particles gave the criterion relation, which showed that, in the case of a well-developed spherulitization, the spherulites should be about fourteen times larger than the incorporated dispersed particles; i.e. to be large enough to engulf dispersed inclusions without considerable disturbing ofthe spherulitic structure. |
|---|---|
| Fizični opis: | str. 2144-2160. |
| ISSN: | 0032-3888 |