CRYSTALLIZATION KINETICS OF LINEAR CYCLOP ENTENE TRANS-OLIGOMERS

The crystallization kinetics of non-fractionated linear cyclopentene t rans-oligomers with various molecular masses was studied. It was estab lished that trans-polypentenylene is characterized by low values of M( cr) (< 2000). The crystallization kinetics of oligomers with M similar or equal to 2200 does not satisfy the Avrami equation, while the proc ess for M greater than or equal to 3000 obeys this law. The value of p arameter n depends on the molecular mass of the sample and falls withi n the interval from 2.4 +/- 0.2 to 4.00 +/- 0.02. The surface energy o f the side and end crystal faces, and the work on folding macromolecul es are 6.57 x 10(-3) J/m(2), 40.1 x 10(-3) J/m(2), and 17.47 kJ/mol, r espectively. The glass transition temperature (-76 degrees C) and the melting point (22 degrees C) of the oligomers were determined from dat a of DSC measurements. It is shown that oligomers are readily amorphiz ed on quenching. The degree of crystallinity of the trans-polypentenyl ene oligomers exceeds that of a high-molecular-mass trans-polypentenyl ene.