Features of phase transitions of high-dispersed low molecular weight hydrocarbon in the porous structure of polyethylene terephthalate, strained in a liquid medium

Specific features of structure and properties of solutions, melts and solid states of polymers in confined nanometric volumes

“…32. 204 As can be seen (see curve 1), the hydrocarbon crystallizes in the bulk at 24 8C (the asymmetric peak, whose shape is, possibly, caused by a transition from orthorhombic to hexagonal packing, which is known to occur in the melting region of saturated hydrocarbons). 205 The spatial restrictions influence the thermal characteristics of OD in the polymer matrix: OD crystallization seems to proceed in two steps (see curve 2).…”

“…204 A PETP film was stretched in liquid OD at 50 8C and cooled in clamps of a stretching device. Due to this procedure, OD, being an efficient adsorptionally active medium, fills the craze porous structure and then crystallizes.…”

“…It is possible to estimate the pore size distribution in the polymer strained in this adsorptionally active medium from the peak shape. The procedure of the estimation is given by Volynskii et al 204 The obtained results are shown in Fig. 34, they represent the size distributions of pores for samples of PETP stretched in OD by 50% and 400%.…”

“…This correlation agrees with known data of evolution of the polymer porous (2). 204 The stretching degree of PET in OD is 50%. (7).…”

“…Plots of size distribution of pores in the structure of PET samples strained in OD by 50 (1) and 400 (2)%. 204 Dashed line intercepts the abscissa axis at the point corresponding to the critical size of the nucleus of crystallization of free OD. dn/N is the probability of the distribution.…”