How to distinguish PP from random copolymerization

How to distinguish PP from random copolymerization

To identify PP homopolymerization and PP random copolymerization, it can be distinguished by the following aspects:

Structural characteristics:

PP homopolymer (PP-H) is polymerized from a single propylene monomer, and the molecular chain does not contain ethylene monomer, so the molecular chain regularity is very high, the crystallinity of the material is high, but the impact performance is poor.

PP random copolymerization (PP-R) is obtained by copolymerization of propylene monomer and a small amount of ethylene (1-4%) monomer under heating, pressure and catalyst. Ethylene monomer is randomly and randomly distributed in the long chain of propylene, which reduces the crystallinity and melting point of the polymer and improves the impact performance of the material.

Performance comparison:

PP homopolymerization has the advantages of good strength, but the disadvantages are poor impact resistance (brittle), poor toughness, poor size stability, easy aging, and poor long-term heat stability.

PP random copolymerization has the advantages of good comprehensive properties, high strength, high rigidity, good heat resistance, good size stability, excellent low temperature toughness (good flexibility), good transparency and good glossiness.

Use differences:

PP homopolymerization can be used for packaging belts, blowing bottles, brushes, ropes, woven bags, toys, folders, electrical appliances, household items, microwave oven lunch boxes, storage boxes, packaging paper films, etc.1.

PP random copolymer is used for pipes, shrink film, drop bottles, transparent containers, transparent household goods, disposable syringes, packaging paper film, etc.2.

Discrimination mode:

PP homopolymerization: After ignition, the wire is flat and not long.

PP random copolymerization: no blackening after ignition, can pull out a long round filament 2.

The above information can help you distinguish PP homopolymerization from PP random copolymerization. If further chemical analysis or laboratory testing is required, it is recommended to contact a specialized material testing agency.