Novel nucleating agents for polypropylene and modifier of its physical-mechanical properties. (March 2021)

• Record Type: Journal Article
• Authors: Balkaev, Dinar; Neklyudov, Vadim; Starshinova, Valentina; Stolov, Mikhail; Amirova, Liliya M.; Ziyatdinova, Anna; Amirov, Rustem R.
• Is Part Of: Materials today communications. Volume 26(2021)
• Publication Date: 2021-03
• Subjects: Polypropylene (PP) -- Nucleation -- Nucleating agent -- Differential scanning calorimetry (DSC) -- Mechanical properties; Materials science -- Periodicals; 620.11
• DOI: 10.1016/j.mtcomm.2020.101783
• Languages: English
• ISSNs: 2352-4928

Abstract

Graphical abstract: Highlights: Based on dicalcium HEDP salt novel nucleators show high efficiency in the nucleation of iPP crystals. Polypropylene nucleation experiments were performed using differential scanning calorimetry. At of 0.25 wt% the nucleators demonstrate an increase in crystallinity + 1.5 % with Ca stearate and + 4% - with Zn stearate. When the dicalcium HEDP salt based nucleator is added to the iPP, the flexural modulus increases by 8–12 %. The main component of the nucleator is synthesized by the one-step reaction in a non-toxic aqueous. Abstract: In this paper, we demonstrate that dicalcium salt of 1-hydroxyethane-1, 1-diphosphonic acid (HEDP) can be used as a component of nucleating agents for isotactic polypropylene (iPP) - one of the most widely used commercial polymers. Based on dicalcium HEDP salt novel nucleators show high efficiency in the nucleation of iPP α -crystals. At a concentration of 0.25 wt% the nucleators demonstrate an increase in crystallinity (+ 1.5 % in composition with calcium stearate and + 4% - with zinc stearate). When the dicalcium HEDP salt based nucleator is added to the iPP, the flexural modulus increases by 8–12 %. Assumptions are suggested about the mechanism of action of the new nucleator, based on its core-shell structure. The main component of the nucleating agent, the dicalcium HEDP salt, is synthesized by the one-step reaction in a non-toxic aqueous medium with commercially available reagents. The synthetic protocol gives a finely friable product that does not require further grinding. The synthesis is cheap and environmentally friendly since only deionized water is used as a solvent.