This study explores how selective filling affects the morphology of immiscible polymers blends across a widest range of compositions to date. There is no comprehensive study of how selective filling affects the morphology of a ternary blend. All existing research covers a very narrow composition range, often at particle loadings under 10 vol%). Two new morphologies unique to particle polymer blends are found: particles bonded together by small menisci of PEO, and a highly-filled particles-in- PEO phase that percolates. Particles have major effects on the morphology when the polymer preferred by the particles (PEO) is in a minority, but only modest effects when the preferred polymer is in a majority. Selective filling is a powerful way to control morphology and hence properties of polymer blends.
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