A new miscible blend of all compositions comprising poly(4-vinyl phenol) (PVPh) and poly(trimethylene terephthalate) (PTT) was discovered and reported. The blends exhibit a single composition-dependent glass transition and homogeneous phase morphology, with no lower critical solution temperature (LCST) behavior upon heating to high temperatures. Interactions and spherulite growth kinetics in the blends were also investigated. The Flory-Huggins interaction parameter (X12) and interaction energy density (B) obtained from analysis of melting point depression are negative (X12 = -0.74 and Β = -32.49J cm-3), proving that the PVPh/PTT blends are miscible over a wide temperature range from ambient up to high temperatures in the melt state. FTIR studies showed evidence of hydrogen-bonding interactions between the two polymers. The miscibility of PVPh with PTT also resulted in a reduction in spherulite growth rate of PTT in the miscible blend. The Lauritzen-Hoffman model was used to analyze the spherulite growth kinetics, which showed a lower fold-surface free energy (σe) of the blends than that of the neat PTT. The decrease in the fold-surface free energy has been attributed to disruption of the PTT lamellae exerted by PVPh in an intimately interacted miscible state.
All Science Journal Classification (ASJC) codes
- Polymers and Plastics
- Organic Chemistry
- Materials Chemistry