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I think the meaning of the word "bulk" — as it is used in English language — is preserved here despite chemical context. I suspect that it's been used to stress some aspects or features of the surface chemistry: thin film is a 2D object, whereas bulk polymer is a 3D object (e.g. continuous in three directions) possessing a significant volume. From IUPAC's ...


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I agree with the interpretation given by andselisk. The authors wish to differentiate thin films vs. bulk of the same polymeric material. One of meanings of bulk given in the unabridged Oxford English Dictionary [by subscription] is Magnitude in three dimensions; volume. 1825 J. R. McCulloch Princ. Polit. Econ. ii. ii. 141 They [gold and silver] ...


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What is happening is not actually the polystyrene melting but rather it dissolving in the acetone solvent. This is a physical change and not chemically altering the polymer. It should still retain its chemical properties as before. However, other properties have changed. It is now a poorer insulator since the air pockets have been removed. It will also be ...


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