The main material of the plastic hollow board is polypropylene, which can be divided into three types: isotactic polypropylene (IPP), syndiotactic polypropylene (SPP), and random polypropylene (APP):
1, Isotactic polypropylene. The methyl group is cis- sterically on the same side of the carbon chain (above or below the plane). This regular structure is easy to crystallize.
2, Syndiotactic polypropylene. Methyl groups appear alternately on both sides of the carbon chain and are syndiotactic. This is also a regular structure that is easy to crystallize.
3. Atactic polypropylene. Methyl groups appear irregularly on both sides of the carbon chain, and crystallization is difficult due to poor structural regularity.