Explanation

As another kind of polystyrene with regular structure, syndiotactic polystyrene developed later than isotactic polystyrene (i-PS). This is because highly regular s-PS, that is, highly syndiotactic (>98%) s-PS, was not synthesized until 1985, and a homogeneous phase titanium coordination catalyst system was used. Since then, there have been continuous reports on synthesis methods, which has promoted the research on its crystal structure. syndiotactic polystyrene has a high melting point (up to 270 ° C) and excellent heat resistance, chemical resistance, water resistance and solvent resistance. It has a wide range of crystallization rate, so it is suitable for conventional processing methods. It is a new type of engineering plastics with broad development prospects. For syndiotactic polystyrene macromolecule chain and its conformation, there is a complex polycrystalline phenomenon. Most people think that when s-PS crystallizes from solution, the macromolecule chain assumes a helical conformation.

Classification