Miscibility behavior in blends of poly(2,6‐dimethylphenylene oxide) and random or block copolymers of styrene with methyl methacrylate

Abstract

The miscibility in blends of poly(2,6-dimethylphenylene oxide) (PPO) with random or block copolymers of styrene and methyl methacrylate (MMA) was studied by light microscopy and glass transition temperature measurements. Blends of PPO and the random copolymers were found to be miscible up to a copolymer content of 18 wt.-% MMA. The transition from miscibility to immiscibility in these blends is independent of temperature in the range 100 to 350 "C. From these data, the segmental interaction parameter between units of the homopolymer and MMA, x~~,~~~ is estimated to be about 0,5. Blends of PPO and the block copolymers of styrene and MMA used behave essentially as the corresponding homopolymers in terms of miscibility.

SAXS and TEM Studies on Poly(styrene)-block-poly(ethene-co-but-1-ene)-block-poly(styrene) in Bulk and at Various Interfaces

“…It has been known that PPE is miscible with a-PS caused by strong attractive interactions (χ PPE/PS = −0.1) − The question remains as to how PPE influences SEBS when there is an interfacial contact. Figure a shows a TEM micrograph of the SEBS / PPE interface after isothermal annealing for 15.25 h at 225 °C.…”

“…17 These favorable enthalpic interactions are also responsible for the miscibility of PPE with PS in block copolymers even in the case where PPE has a much larger molecular weight than the PS block. [18][19][20] The question remains as to how PPE influences SEBS when there is an interfacial contact.…”

Miscibility and specific interactions in blends of poly(4‐vinylphenol‐co‐methyl methacrylate)/poly(styrene‐co‐4‐vinylpyridine)

“…Karasz et al have been suggested that blends of poly(2,6‐dimethylphenylene oxide) (PPO) and random copolymers of styrene (S) and methyl methacrylate (MMA) were found to be miscible up to a copolymer content to 18 wt % of MMA. Above this critical MMA content, the blends of PPO/PSMMA exhibit two T g s occurring the phase separation 8. Some years ago, Paul and Barlow have enumerated several cases of miscible binary blends involving copolymers when their corresponding homopolymers are not similarly miscible 7.…”