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A. the glass transition temperature of semi-crystalline PE lies below the melting temperature of semi-crystalline PE, if measurements are obtained from samples having the same molecular weigth distribution.

B. The isotactic conformation of polypropylene is more regular than the syndiotactic conformation of polypropylene.

C. Vinyl Polymers can exist as both Cis and trans isomers.

D. Atactic PMMA is more crystalline than atactic PS.

E. The melting temperature of semi-crystalline PP is not sensitive to tacticity.

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