Direct measurement of molecular weight and grafting density by controlled and quantitative degrafting of surface-anchored poly(methyl methacrylate)
ACS Macro Letters, ISSN: 2161-1653, Vol: 4, Issue: 2, Page: 251-254
2015
- 55Citations
- 3Usage
- 106Captures
Metric Options: Counts1 Year3 YearSelecting the 1-year or 3-year option will change the metrics count to percentiles, illustrating how an article or review compares to other articles or reviews within the selected time period in the same journal. Selecting the 1-year option compares the metrics against other articles/reviews that were also published in the same calendar year. Selecting the 3-year option compares the metrics against other articles/reviews that were also published in the same calendar year plus the two years prior.
Example: if you select the 1-year option for an article published in 2019 and a metric category shows 90%, that means that the article or review is performing better than 90% of the other articles/reviews published in that journal in 2019. If you select the 3-year option for the same article published in 2019 and the metric category shows 90%, that means that the article or review is performing better than 90% of the other articles/reviews published in that journal in 2019, 2018 and 2017.
Citation Benchmarking is provided by Scopus and SciVal and is different from the metrics context provided by PlumX Metrics.
Example: if you select the 1-year option for an article published in 2019 and a metric category shows 90%, that means that the article or review is performing better than 90% of the other articles/reviews published in that journal in 2019. If you select the 3-year option for the same article published in 2019 and the metric category shows 90%, that means that the article or review is performing better than 90% of the other articles/reviews published in that journal in 2019, 2018 and 2017.
Citation Benchmarking is provided by Scopus and SciVal and is different from the metrics context provided by PlumX Metrics.
Metrics Details
- Citations55
- Citation Indexes55
- 55
- CrossRef50
- Usage3
- Abstract Views3
- Captures106
- Readers106
- 106
Article Description
We report on quantitative determination of the molecular weight distribution (MWD) and grafting density (σ) of polymer assemblies grown by controlled radical polymerization from flat substrates as a function of polymerization time and the ratio between the inhibitor and catalyst species. Specifically, we grow poly(methyl methacrylate) (PMMA) brushes on flat silica-based surfaces by surface-initiated atom transfer radical polymerization (SI-ATRP), cleave the PMMA grafts quantitatively using tetrabutyl ammonium fluoride (TBAF), and analyze their MWD by size exclusion chromatography equipped with a high-sensitivity differential refractive index detector. The polymer growth and degrafting processes are followed by ellipsometry, X-ray photoelectron spectroscopy, and time-of-flight secondary ion mass spectrometry. The σ is independent of polymerization time and increases with increasing SI-ATRP inhibitor/catalyst ratio. Specifically, σ increases from 0.48 ± 0.06 to 0.58 ± 0.06 chains/nm as the inhibitor/catalyst molar ratio increases from 0 to 0.015, respectively, providing evidence that high inhibitor/catalyst ratio offers better control of the SI-ATRP reaction, by lowering number of terminations, and leading to denser PMMA brush assemblies.
Bibliographic Details
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=84923162809&origin=inward; http://dx.doi.org/10.1021/mz5007188; http://www.ncbi.nlm.nih.gov/pubmed/35596417; https://pubs.acs.org/doi/10.1021/mz5007188; https://digitalcommons.kettering.edu/chem_eng_facultypubs/22; https://digitalcommons.kettering.edu/cgi/viewcontent.cgi?article=1022&context=chem_eng_facultypubs
American Chemical Society (ACS)
Provide Feedback
Have ideas for a new metric? Would you like to see something else here?Let us know