Research Article

Preparation and Structural Properties of Free Films from Rapeseed Oil-Based Rigid Polyurethane-Montmorillonite Nanocomposites

Table 3

The values of , initial , and final of the glass-transition process for the PU/OMMT nanocomposites.

, %

1st heating
055628126719
13771106693436
3808810929821
755618227621

2nd heating
093110129361719
179106139602733
395116136412021
78097107431726