Cryogenic Mechanical Milling of Syndiotactic Polystyrene (sPS)

Stranz, Michael; Köster, Uwe

doi:10.4028/www.scientific.net/jmnm.20-21.281

Cited by 1 publication

(2 citation statements)

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Section: Resultsmentioning

confidence: 99%

“…[40,41] They agreed with the assumption of plastic deformation during milling as the principal route to creating structural changes and mechanical degradation, as it has also been reported with syndiotactic polystyrene, ultrahigh molecular weight polyethylene, high molecular weight polyethylene, and polyvinyl chloride. [42][43][44][45] It is worth mentioning that polystyrene milled with R-L and TEMPO presented some amount of ferric material coming from the eroded milling media, while the polystyrene milled without a radical scavenger did not present this characteristic. A higher amount of ferric material was observed in the polystyrene milled in the PM with R p = 150 mm when compared with the polystyrene milled in the PM with R p = 60.8 mm.…”

Section: X-ray Electron Spectrometrymentioning

confidence: 99%

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Mechanochemical tuning of molecular weight distribution of styrene homopolymers as postpolymerization modification in solvent‐free solid‐state

Jimenez-Francisco

Carrillo

Garcı́a-Cerda

2020

J of Applied Polymer Sci

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Mechanochemical degradation by planetary ball milling (PM) is used for postpolymerization modification of styrene homopolymers (PS). A complete factorial design was chosen to study the effect of radical scavengers, milling time, initial molecular weight, and revolution radius (R p), on the shape of molecular weight distributions (MWDs) of PS. Size-exclusion chromatography analysis shows the feasibility of fine-tuning MWD of PS at up to 40% conversion. Distributions ranged from unimodal to bimodal in a PM with R p = 150 mm at different stage of milling, whereas in a PM with R p of 60.8 mm the adjustment of unimodal distributions is achieved. Initial polydispersity is more important to develop bimodal distributions when compared with initial molecular weight. Fourier transform infrared and X-ray electron spectrometry analysis show some suppression of PS degradation and complete oxidation inhibition of macromolecular radicals with the incorporation of radical scavengers, which we considered as additional aids when adjusting the MWDs.

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Section: Resultsmentioning

confidence: 99%