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Novel lightweight open-cell polypropylene foams for filtering hazardous materials
Fei Wu1,2, Pengke Huang1,2, Haibin Luo1
1Ningbo Key Lab of Polymer Materials, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences Ningbo Zhejiang province 315201 China shenbin@nimte.ac.cn wgzheng@nimte.ac.cn.
RSC Advances
|May 6, 2022
Summary
Novel polypropylene (PP) foams offer a greener alternative to traditional cellulose acetate (CA) cigarette filters. These PP foams, created using supercritical CO2 foaming, show promising filtration of harmful smoke components.
Area of Science:
- Materials Science
- Chemical Engineering
- Environmental Science
Background:
- Traditional cellulose acetate (CA) cigarette filters involve complex processing and chemical solutions.
- Concerns exist regarding micro/nano-fiber release from CA filters.
Purpose of the Study:
- To develop novel, lightweight polypropylene (PP) foams as alternative cigarette filters.
- To utilize supercritical CO2 (scCO2) foaming technology for eco-friendly filter preparation.
Main Methods:
- Design and preparation of PP foams with varying porous structures via scCO2 extrusion foaming.
- Evaluation of draw resistance and filtration performance for smoke constituents (tar, nicotine, B[a]P).
Main Results:
- Successfully prepared PP foams with flower-like/bamboo-like structures.
- Achieved modest draw resistance (2625 Pa) suitable for smoking mouthfeel.
- Demonstrated comparable filtration of tar, nicotine, and benzo[a]pyrene (B[a]P) to CA filters.
Conclusions:
- PP foams produced via scCO2 foaming are a viable, eco-friendly alternative to CA filters.
- The developed PP filters show potential for filtering hazardous materials in cigarette smoke.
- Further investigation into foam structure formation and smoke transport mechanisms is warranted.
