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Activity of substrates in the catalyzed nucleation of poly(ethylene terephthalate) melts

✍ Scribed by A. Dobreva; M. Alonso; M. Gonzalez; J. A. De Saja

Publisher
John Wiley and Sons
Year
1997
Tongue
English
Weight
164 KB
Volume
63
Category
Article
ISSN
0021-8995

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✦ Synopsis

The activity, F, of AgBr, AgI, PbF 2 , Ag 2 S, LiF, and CaF 2 in the catalyzed nucleation of poly(ethylene terephthalate) (PET) melts was determined using a nonisothermal differential scanning calorimetry (DSC) technique. A comparison with existing experimental data was made. It is established that the higher the melting temperature of the substrate the lower its activity as a crystallization core in the heterogeneous nucleation of PET. The lateral surface energy, s, the end surface energy, s e , the adhesion energy, b, and the difference between the surface energies at the substrate/melt, s s f , substrate/deposit, s*, and the total energy of misfit dislocations, E d [i.e., s s f 0 (s* 0 E d )] were calculated.

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