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Structure–Property–Process Relationship for Blown Films of Bimodal HDPE and Its LLDPE Blend
Author(s) -
Rungswang Wonchalerm,
Wongpanit Panya,
Jarumaneeroj Chatchai,
Jirasukho Prapasinee,
Juabrum Sawitree,
Soontara Siriwat,
Rugmai Supagorn
Publication year - 2019
Publication title -
macromolecular materials and engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.913
H-Index - 96
eISSN - 1439-2054
pISSN - 1438-7492
DOI - 10.1002/mame.201900325
Subject(s) - linear low density polyethylene , materials science , high density polyethylene , lamellar structure , polyethylene , crystallite , composite material , crystal (programming language) , metallurgy , computer science , programming language
Blown films of bimodal‐high‐density polyethylene (HDPE) (BPE) and its blend containing 40 wt% of linear low‐density polyethylene (LLDPE) are prepared in various neck‐heights (NHs). The crystal structures of both films are investigated in detail using small‐angle X‐ray scattering and wide‐angle x‐ray diffraction techniques. The results show that the blending of LLDPE notably modifies the crystal structure of BPE, including crystal density (ρ c ), crystallite size of the 110 plane (〈 L 110 〉), thickness of the lamellar crystal ( L c ), and grain widths of the lamellae. The relationships between NH, crystal structure, and the resistance of dart‐drop impact (DDI) are investigated for both BPE and BPE/LLDPE films. The results indicate that the reorientation of lamellae might be a primary factor responsible for the DDI property. However, large values of ρ c , L c , and 〈 L 110 〉 are required for the film to achieve high DDI.