Influence of moisture on molecular motion in nylon 4 studied by NMR

The influence of crystallinity and radiation crosslinking on the water induced depression of the glass transition temperature in Nylon 4 [poly(2-pyrrolidone)] has been investigated by differential scanning calorimetry. Radiation crosslinking was effective in preventing exothermic events associated with crystallization during the measurement of the incremental change in heat capacity (AC,); a parameter necessary for the theoretical evaluation of the depressed glass transition temperature. ACp , when normalized to account for fractional crystallinity, was found to deviate substantially from a linear two phase relation. A simple three phase representation of morphology is proposed to account for this deviation, and assumptions have been made regarding the distribution of plasticizer, leading to good agreement between the theoretical and experimentally observed depressions of the glass transition temperature. x, ACE' (X) Tg, ( X ) + ~2 ACp2 Tg, x, ACp";' (X) + 3 AC,, TP,, = Details concerning the origin of Eq.(1) may be found elsewhere*), but here 1 and 2 refer to polymer and diluent, respectively, Tg is the glass transition temperature of the pure component, AC,, is the incremental change in heat capacity at Tgz , xis the mole ' )

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Studies on the water induced plasticization behavior of nylon 4. The influence of crystallinity and radiation crosslinking

Jin

Ellis

Karasz

1985

Makromol. Chem.

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NMR and magnetic susceptibility study of woods and cellulose

et al. 1984

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Influence of moisture on molecular motion in nylon 4 studied by NMR

Cited by 2 publications

References 12 publications

Studies on the water induced plasticization behavior of nylon 4. The influence of crystallinity and radiation crosslinking

Studies on the water induced plasticization behavior of nylon 4. The influence of crystallinity and radiation crosslinking

NMR and magnetic susceptibility study of woods and cellulose

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