Wear-induced mechanical degradation of plastics by low-energy wet-grinding

Ravishankar, K.; Ramesh, Praneeth S; Balaji, S.; Dhamodharan, R.

doi:10.1016/j.polymdegradstab.2018.10.026

Cited by 15 publications

(10 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The shifting of the peak molecular weight in the chromatograms from the original curve toward a lower peak molecular weight can be attributed to the preferential chain scission of molecules with a higher degree of polymerization, while the generation of two peaks molecular weights in the MWD curves can be attributed to the percentage of chain scissions for this milling time. [ 15,24 ]…”

Section: Resultsmentioning

confidence: 99%

“…In a more recent study, Ravishankar et al simulated polymer distributions showing the effect of percentages of chain scissions on molecular weight and MWD of different polymers submitted to abrasion grinding. [ 24 ] From this simulation study, the final shape of the MWD is reported to be dependent on the percentage of chain scissions and initial molecular weight dispersity. [ 24 ] However, the experimental results did not show the obtention of bimodality.…”

Section: Introductionmentioning

confidence: 99%

“…[ 24 ] From this simulation study, the final shape of the MWD is reported to be dependent on the percentage of chain scissions and initial molecular weight dispersity. [ 24 ] However, the experimental results did not show the obtention of bimodality.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

View full text Add to dashboard Cite

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.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

View full text Add to dashboard Cite

show abstract

“…The authors concluded that substantial reduction in molecular weight and increased polydispersity occurs with an increase in milling time under ambient and cryogenic temperatures. Low energy wet grinding of PS, PLA, polycarbonate (PC), and PMMA found to be effective in reducing the particle size and altering the morphology of polymers ( Ravishankar et al, 2018 ). The polymer powders produced under wet grinding conditions showed substantial chain scission, decreased molecular weight, and strains along the polymer backbone.…”

Section: Mechano-thermo-photo Irradiative and Green Chemical (Pre)treatment Of Plasticsmentioning

confidence: 99%

Progressing Plastics Circularity: A Review of Mechano-Biocatalytic Approaches for Waste Plastic (Re)valorization

Nikolaivits

Pantelic

Azeem

et al. 2021

Front. Bioeng. Biotechnol.

View full text Add to dashboard Cite

show abstract

“…9 Under the conditions of wet grinding, the grinding ball is subject to wear and repeated impact, which accelerate the crushing rate. [10][11] Thus, the grinding ball must have excellent mechanical properties such as hardenability and wear resistance to meet the working conditions. [12][13] The hardness is directly dependent on the hardenability of the material, so a designed #150-mm grinding ball must exhibit high hardenability.…”

Section: Introductionmentioning

confidence: 99%

Effect of Nb on the properties of a large-sized grinding ball

Song¹,

Zheng²,

Wang³

et al. 2019

Mater. Tehnol.

View full text Add to dashboard Cite

Grinding balls are widely used in the mining industry due to their favorable properties; however, poor hardenability of largesized grinding balls is a limitation in wide applications. The hardenability and hardness of large-sized grinding balls can be affected by microalloying elements. In this work, Nb microalloying was used to improve the mechanical properties of largesized grinding balls. The microstructures and mechanical properties of Nb-containing grinding balls were studied in contrast to the Nb-free steel. Typical microstructures were observed with OM and SEM, respectively. The hardness was obtained with a Rockwell hardness tester. The results show that the typical microstructure of a large-sized grinding ball was mainly martensite and that the fracture surface consisted of dimples of different sizes. The prior-austenite grain size (PAGS) was decreased from 31.5 μm to 22.6 μm by adding 0.04 % Nb with a refined microstructure.

show abstract

Wear-induced mechanical degradation of plastics by low-energy wet-grinding

Cited by 15 publications

References 27 publications

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

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

Progressing Plastics Circularity: A Review of Mechano-Biocatalytic Approaches for Waste Plastic (Re)valorization

Effect of Nb on the properties of a large-sized grinding ball

Contact Info

Product

Resources

About