NDLI: Tuning structural parameters of polyethylene brushes on silica nanoparticles in surface-initiated ethylene “living” polymerization and effects on silica dispersion in a polyolefin matrix

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Back cover

Polymer Chemistry Vol - 4 Issue - 4

Polymer Chemistry Vol - 4 Issue - 3

Polymer Chemistry Vol -3

Polymer Chemistry Vol -2

Polymer Chemistry Vol -1

Tuning structural parameters of polyethylene brushes on silica nanoparticles in surface-initiated ethylene “living” polymerization and effects on silica dispersion in a polyolefin matrix

Content Provider	Royal Society of Chemistry (RSC)
Author	Petrie, Kyle Subramanian, Ramesh Xiang, Peng Kontopoulou, Marianna Ye, Zhibin
Copyright Year	2013
Abstract	Surface-initiated ethylene “living” polymerization with covalently tethered Pd–diimine catalysts represents a novel technique for covalent surface functionalization of silica nanoparticles with polyethylene (PE) brushes. In this paper, we report on the successful tuning of various structural parameters of PE brushes in this surface-initiated polymerization technique, including brush length, density, and topology. To control/reduce the brush density, the density of the surface-tethered acryloyl groups for catalyst immobilization is adjusted by using mixed silane agents comprised of effective 3-acryloxypropyltrichlorosilane and inert ethyltrichlorosilane at different compositions in the surface functionalization step, which in turn adjusts the density of immobilized catalysts for rendering PE brushes. This approach gives rise to low-polydispersity PE brushes of controllable densities at the polymerization condition of 27 atm/5 °C: 0.022–0.055 chains per nm2 on a precipitated silica (Silica-I) and 0.07–0.17 chains per nm2 on a fumed silica (Silica-II). The length of PE brushes is controlled by adjusting the polymerization time, with the highest brush length of about 45 kg mol−1 achieved at 6 h of polymerization at 27 atm/5 °C. Unlike the linear brushes with short branch structures obtained at 27 atm/5 °C, hyperbranched PE brushes with compact topology are obtained at 1 atm/25 °C, benefiting from the chain walking mechanism of the Pd–diimine catalyst. The PE-grafted silicas of varying brush density and length are subsequently used as nanofillers to construct polymer nanocomposites with an ethylene–α-olefin copolymer as the matrix polymer. The effects of brush length and density on the nanofiller dispersion and physical properties of the composites are examined. This represents the first study on polyolefin composites containing silica nanoparticles grafted with polyolefin brushes as nanofillers.
Starting Page	1381
Ending Page	1395
Page Count	15
File Format	HTM / HTML PDF
ISSN	17599954
Volume Number	4
Issue Number	5
Journal	Polymer Chemistry
DOI	10.1039/c2py20722b
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Polyethylene Fumed silica Ethylene Polymerization Polymer Topology Silicon dioxide Composite material Statistical dispersion Polyolefin Covalent bond Copolymer Silane
Content Type	Text
Resource Type	Article
Subject	Organic Chemistry Biochemistry Bioengineering Biomedical Engineering Polymers and Plastics

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