The plastic board is brittle at low temperature
Plastics are polymer materials at room temperature showed a hard and tough, in higher temperature conditions will exhibit toughness even elasticity, once the temperature is reduced to below the glass transition temperature or brittle point, it will show the brittleness.The usual example is that plastic barrels behave very soft in the summer, and when they fall, they appear very stiff in the winter
Plastics are polymer materials at room temperature showed a hard and tough, in higher temperature conditions will exhibit toughness even elasticity, once the temperature is reduced to below the glass transition temperature or brittle point, will show the fragility of.
Reducing temperature and becoming brittle is one of the characteristics of polymers. If they revert to the original temperature, they will not be brittle, so no new substances are produced during the process of change, which belongs to physical changes.
