High-Pressure Injection Molding of Isotactic Polypropylene and Its Nanocomposite with Multiwall Carbon Nanotubes: Enhancing Mechanical Properties Through γ-Form Crystallization.

ABSTRACT: Isotactic polypropylene (iPP), solidified under high-pressure in the orthorhombic γ-form, can exhibit enhanced mechanical properties compared to iPP crystallized in the common monoclinic α-form under atmospheric pressure. The aim of the study was to enhance the mechanical performance of injection-molded iPP and its nanocomposite containing 5 wt% of multiwall carbon nanotubes (MWCNTs) through high-pressure processing, which induced the formation of the γ-phase. Initially, the materials were crystallized in a high-pressure cell. To simulate the conditions during molding, crystallization was carried out by pressurizing the molten polymer to 250 MPa. For comparison, crystallization was also performed during cooling under 200 MPa and 1.4 MPa. Subsequently, the injection molding was conducted un

SUBMITTER: Veluri S 

PROVIDER: S-EPMC12694080 | biostudies-literature | 2025 Nov

REPOSITORIES: biostudies-literature