HMC Polymers is fully committed to continuous research and development of catalysts, processes, and various innovations to ensure delivery of unique products to meet ever-changing needs of customers.
The physical properties and characteristics of PP are prime factors for uninterrupted and efficient production of the final moulded and casted products. We have provided full disclosure of fundamental PP product data of all grades to customers for their decision-making on procurement and applications as well as custom-made orders.
PP Molecular Structures
Molecular structures are the foremost parameters affecting the physical properties of PP. The molecular structure is semi-crystalline with some molecular chains bonded in a neat order like all other crystals, while the remaining ones are bonded in disorder, forming an amorphous structure.
PP is composed of three theoretical basic structures:
- Isotactic side group: all the molecules are located on the same side of the main polymer chain or the prime molecular chain.
- Syndiotactic side group: the molecules are located on the opposite side of the main polymer chain.
- Atactic side group: the molecules are scattered in locations.
General commercial PP is composed of two main molecular structures, isotactic and atactic, mostly with more than 90% isotactic.
PP physical properties are controlled by the following key parameters.