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A review on the free radical grafting of vinyl monomers onto polyethylene and polypropylene by reactive extrusion.
- Source :
-
Chemical Engineering Science . Aug2023, Vol. 278, pN.PAG-N.PAG. 1p. - Publication Year :
- 2023
-
Abstract
- Polyethylene (PE) and polypropylene (PP) have been widely used in films, pipes, plates, fibers, and electronic devices, etc. due to a good balance between mechanical properties, processability and cost. They are apolar and chemically relatively inert. Sometimes these characteristics may restrain their application. A solution to making them polar and/or chemically reactive is to graft polar and/or functional groups onto their backbones. This can be done by free radical chemistry via a reactive extrusion process which is continuous, solventless and of short residence time (<a few minutes). This review describes problems related to free radical grafting: low grafting yield, monomer residual, and side reactions (especially chain scission for PP and gel formation for PE), and strategies to solve them: addition of comonomers, use of nano-reactors, optimization of screw profile and mixing, sequential feeding of monomers, assistance of supercritical carbon dioxide (scCO 2), and devolatilization. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00092509
- Volume :
- 278
- Database :
- Academic Search Index
- Journal :
- Chemical Engineering Science
- Publication Type :
- Academic Journal
- Accession number :
- 164256639
- Full Text :
- https://doi.org/10.1016/j.ces.2023.118916