Synthesis of isotactic polypropylene-block-polystyrene block copolymers as compatibilizers for isotactic polypropylene/polyphenylene oxide blends

Poly(2,6-dimethyl-1,4-phenylene oxide) (PPO) and isotactic polypropylene (iPP) are highly incompatible and consequently their uncompatibilized blends are quite brittle regardless of the molecular weights and ductility of the individual components. Isotactic polypropylene-polystyrene block copolymers...

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Bibliographic Details
Published in:Polymer (Guilford) 2018-07, Vol.147, p.121-132
Main Authors: Jasinska-Walc, Lidia, Bouyahyi, Miloud, Lorenc, Piotr, Heeneman, Alexander Leijen, Duchateau, Rob, Różański, Artur, Bernaerts, Katrien V.
Format: Article
Language:English
Subjects:
Block copolymers
Chemical synthesis
Compatibility
Compatibilization
Compatibilizers
Composition
Copolymers
Ductility
Electron transfer
Genetic transformation
Impact resistance
Isotactic polypropylene-block-polystyrene block copolymers
Isotacticity
Mechanical properties
Polydimethyl phenylene oxide
Polymer blends
Polymerization
Polyphenylene oxides
Polypropylene
Polystyrene
Polystyrene resins
PPO/iPP polymer blends
Styrene
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Summary:Poly(2,6-dimethyl-1,4-phenylene oxide) (PPO) and isotactic polypropylene (iPP) are highly incompatible and consequently their uncompatibilized blends are quite brittle regardless of the molecular weights and ductility of the individual components. Isotactic polypropylene-polystyrene block copolymers, to be applied as compatibilizers for a broad range of PPO/iPP blend compositions, were prepared by mechanism transformation from coordination polymerization (iPP) to Activators Regenerated by Electron Transfer (ARGET) Atom Transfer Radical Polymerization of styrene. The effect of the block copolymer composition and loading on the mechanical, thermal and morphological properties of the blends was studied. The addition of compatibilizer resulted in significant decreased domain size of the dispersed phase and improved mechanical properties. An unexpected phenomenon was observed for some compatibilized iPP-rich blends with only 20% PPO, which were characterized by an even higher impact resistance than that of pure PPO. [Display omitted] •iPP-b-PS as efficient compatibilizer for PPO/iPP blends.•Compatibilized blends rich in iPP have unexpectedly high impact resistances.•During injection molding, reinforcing PPO fibrils are formed in the iPP matrix.
ISSN:0032-3861
1873-2291
DOI:10.1016/j.polymer.2018.05.075