The "glass transition" temperature is the point at which it happens. For instance, low-density polyethylene has a glass transition temperature, or Tg, of about 100°C.
He claims that the fact that the Tg of PVC/CF composite is higher (86.7 °C) than the Tg of pure PVC (76.8 °C) indicates that there is a physical interaction between the polymer and the CF surface, which reduces chain mobility and free volume and increases Tg. Pressure and free volume. Increased surrounding pressure causes a decrease in free volume, which ultimately results in increased Tg. The glass transition temperature of polymers is also significantly influenced by other elements such as branching, alkyl chain length, bond interaction, flexibility of the polymer chain, film thickness, etc.
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