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    Glass transition temperature

    Can anyone tell me why poly(ethelyne glycol) has a higher Tg than polyethylene?
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    Electronegativity of halogens

    Can anyone explain concisely why Trifluoroacetic Acid is more acidic than Trichloroacetic Acid, but HCl is more acidic than HF?
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    End to end distance of various copolymers

    This is a question out of Polymer Chemistry by Hiemenz and Lodge. (not homework, I'm just curious) For freely jointed copolymers with nA steps of length lA and nB steps of length lB find <h2> for strictly alternating, random and diblock architectures. Are the answers the same or different...