Effect of molecular weight distribution on the structure and properties of polypropylene cast film and stretched microporous membrane
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Dahua Chen
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Ruijie Xu
Abstract
Two isotactic polypropylene (iPP) resins with approximate weight-average molecular weight (Mw) and different molecular weight distribution (MWD) were chosen to prepare cast films by the melt-stretching method. The lamellar morphology and mechanical properties of the initial precursor films and stretched microporous membranes were characterized. It was found that PP1 resin with a broader MWD exhibits a higher relaxation time of around 5.5 s, a larger entanglement density of 24.7 mol/m3 and fast crystalline ability. The lamellar lateral size, orientation degree and entanglement density of the corresponding cast film are significantly increasing, resulting in higher elastic recovery and more apparent strain-hardening behavior. The PP resin with broader MWD also benefits the pore formation, resulting in a larger pore size and better air permeability of the stretched microporous membrane.
Funding source: The Youth Fund Project of Regional Joint Foundation- Fundamental and Applied Basic Research Foundation of Guangdong Province
Award Identifier / Grant number: 2021A1515110648
Funding source: Guangzhou Municipal Science and Technology Project
Award Identifier / Grant number: 202102020952
Funding source: Foshan Science and Technology Innovation Project
Award Identifier / Grant number: FS0AA-KJ919-4402-0145
Funding source: Project of Science Foundation of Guangdong Province
Award Identifier / Grant number: 2021A1515011914
Funding source: National Natural Science Foundation of China
Award Identifier / Grant number: 52173033
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Research ethics: Not applicable.
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Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
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Competing interests: The authors declare no conflicts of interest regarding this article.
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Research funding: The authors would like to thank the Project of the National Science Foundation of China under grant 52173033, Guangzhou Science and Technology Plan Project (202102020952), Project of Science Foundation of Guangdong Province (2021A1515011914), The Youth Fund Project of Regional Joint Foundation- Fundamental and Applied Basic Research Foundation of Guangdong Province (2021A1515110648), Foshan Science and Technology Innovation Project (no. FS0AA-KJ919-4402-0145).
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Supplementary Material
This article contains supplementary material (https://doi.org/10.1515/polyeng-2023-0118).
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Artikel in diesem Heft
- Frontmatter
- Material Properties
- Influence of betalain natural dye from red beet in gum acacia biopolymer: optical and electrical perspective
- Effect of molecular weight distribution on the structure and properties of polypropylene cast film and stretched microporous membrane
- Preparation and Assembly
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Artikel in diesem Heft
- Frontmatter
- Material Properties
- Influence of betalain natural dye from red beet in gum acacia biopolymer: optical and electrical perspective
- Effect of molecular weight distribution on the structure and properties of polypropylene cast film and stretched microporous membrane
- Preparation and Assembly
- Preparation and properties of dynamic crosslinked styrene butadiene rubber
- Antimicrobial hydrocolloid composite sponge with on-demand dissolving property, consisting mainly of zinc oxide nanoparticles, hydroxypropyl chitosan, and polyvinyl alcohol
- Engineering and Processing
- Multiobjective optimization of injection molding parameters based on the GEK-MPDE method
