Effect of annealing on the microvoid formation and evolution during biaxial stretching of β nucleated isotactic polypropylene. Issue 14 (21st September 2020)

• Record Type: Journal Article
• Authors: Zhang, Daoxin; Ding, Lei; Yang, Feng; Lan, Fang; Cao, Ya; Xiang, Ming
• Is Part Of: Polymer-plastics technology and materials. Volume 59:Issue 14(2020)
• Page Start: 1595
• Page End: 1607
• Publication Date: 2020-09-21
• Subjects: Β-iPP -- annealing -- transverse stretching -- microvoid formation -- microvoid size distribution; Polymers -- Periodicals; Polymerization -- Periodicals; Plastics -- Periodicals; Plastics; Polymerization; Polymers; Periodicals; 668
• DOI: 10.1080/25740881.2020.1758136
• Languages: English
• ISSNs: 2574-0881

Abstract

ABSTRACT: Cast films, based on β-iPP, were prepared via melt extrusion, and, then annealed at different temperature. The effect of annealing on the properties of the cast films, as well as on microvoid formation and evolution was investigated. After annealing, the initial lamellar structure was improved, and more secondary crystals were formed which decreased the numbers of tie chains, which was beneficial to cavitation. And the stability of β-crystal and β lamellar thickness distribution was improved. Finally, the membrane obtained by unannealed film had inferior pore-size distribution, while the annealed sample had uniform pore-size distribution. GRAPHICAL ABSTRACT: