F. Decandia et al., INFLUENCE OF AGING ON THE ORDERING PHENOMENA OF SYNDIOTACTIC POLYSTYRENE, Macromolecular chemistry and physics, 195(2), 1994, pp. 735-741
The crystallization from the glassy state of different samples of synd
iotactic polystyrene (sPS) was investigated with different techniques,
such as differential scanning calorimetry, infrared analysis, and pol
arized optical microscopy. The different samples of sPS were obtained
by ageing the glassy sPS films at room temperature and at 70-degrees-C
; the behaviour of these films was compared with that of the fresh sam
ple, put at the crystallization temperature as soon as prepared. The t
emperature of crystallization was 120-degrees-C; at this temperature,
besides the crystalline phase, a fraction of mesophase is formed. All
the techniques investigated to follow the crystallization phenomenon s
how that the fresh sample crystallizes much sooner than the others; th
e sample aged at 70-degrees-C takes the longest time to crystallize, w
hereas an intermediate behaviour characterizes the sample aged at room
temperature. This result was correlated with the initial structural o
rganization of the glassy amorphous samples.