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Research Progress In Polypropylene Modification
- Jan 21, 2019 -

1.  Elastomer toughening modification

The use of elastomers to toughen modified PP is a very effective way. Elastomers are blended with PP. Dispersion in PP matrix can achieve toughening purposes, and its impact strength and elongation at break increase, but the stiffness of the material. The strength, processing and processing properties are greatly reduced. Traditional ethylene-propylene rubber (EPR, EPDM) is the most commonly used elastomer toughening agent, because both PP and PP contain propylene segments, and the solubility parameters are similar, satisfying Similar to the principle of compatibility, the toughening agent has good compatibility with the PP matrix, which can improve the impact properties and low temperature brittleness of PP.

2. Rigid body toughening modification

The toughening modification of the elastomer significantly increases the toughness of PP, but its modulus, strength and heat distortion temperature are reduced. However, the addition of rigid particles can make up for this defect and improve the impact strength, tensile strength, Modulus, heat distortion temperature, processing flow performance, etc., can also significantly reduce costs, have higher economic benefits. Commonly used rigid particles are calcium carbonate, montmorillonite, talc, barium sulfate, silica and mica.

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