+ Resolve Article
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter

+ Translate
+ Subscribe to Site Feed
GeoScience Most Shared ContentMost Shared Content

Characterization of poly(methyl methacrylate)-graft-poly(styrene)s using various chromatographic techniques

, : Characterization of poly(methyl methacrylate)-graft-poly(styrene)s using various chromatographic techniques. Journal of Chromatography. A 1473(): 76-82

NlmCategory="UNASSIGNED">Two graft copolymer samples of identical average composition were synthesized by grafting living polystyrene anions onto a broadly distributed PMMA backbone. Size exclusion chromatography (SEC) with only RI-detection, SEC with viscometry and light scattering detection, SEC with UV and RI dual detection, gradient chromatography and 2-dimensional chromatography were applied to compare the information that can be obtained by the different techniques. While only limited information was retrieved by conventional SEC or SEC with molar mass sensitive detection, SEC with UV and RI revealed different chemical heterogeneity of the samples. Using gradient chromatography and 2-dimensional chromatography it was possible to identify non-grafted side chains and unreacted parent PMMA besides the actual graft copolymer molecules. While in one sample a heavily grafted product was formed besides non-grafted PMMA, the second sample did not contain ungrafted PMMA but a graft product of lower grafting density. The different product distributions were explained by the different synthetic procedures.


PMID: 27793393

DOI: 10.1016/j.chroma.2016.10.046

Other references

Souza, M.C.A.; Ferraz Filho, P.B.; Silva, L.O.C.; Souza, J.C.; Malhado, C.H.M., 2004: Environmental and genetic effects on weight at weaning of bovines of Polled Nelore cattle in western Sao Paulo - Parana region. The objective of this study was to investigate the environmental, maternal and direct genetic effects on the weaning weight of Polled Nelore cattle from western Sao Paulo and Parana regions in Brazil. The analysis of environmental factors, season...

Ishida, H.; Ahmed, K., 1973: Studies on phosphoproteins of submandibular gland nuclei isolated from isoproterenol-treated rats. Experimental Cell Research 78(1): 31-40

Lindblom A., 1973: Automatic peritoneal dialyzer peri dialyser wm 101. Proceedings Of The National Meeting On Biophysics & Biotechnology In Finland: 210

Kemp, B.E., 2004: Bateman domains and adenosine derivatives form a binding contract. Conserved pairs of CBS sequence motifs (named after cystathionine beta-synthase) found in a wide variety of proteins associate to form Bateman domains. A new study establishes that Bateman domains bind adenosyl compounds and regulate IMP dehydroge...

Weber, W.N., 1999: Cost analysis studies of Mohs micrographic surgery. Journal of the American Academy of Dermatology 41(1): 130-131

Krajewski, W.A., 2014: Comparison of the Isw1a, Isw1b, and Isw2 nucleosome disrupting activities. The three Saccharomyces cerevisiae ISWI chromatin remodeling complexes, Isw1a, Isw1b, and Isw2, are implicated in the regularization of arrayed nucleosomes and regulation of gene activity. Although Isw1a and Isw1b are based on the same catalytic u...

Vogel, R.; Seyffert, M.; Pereira,; Fraefel, C., 2013: Viral and Cellular Components of AAV2 Replication Compartments. Adeno-associated virus 2 (AAV2) is a helpervirus-dependent parvovirus with a bi-phasic life cycle comprising latency in absence and lytic replication in presence of a helpervirus, such as adenovirus (Ad) or herpes simplex virus type 1 (HSV-1). Hel...

Hoffmann, C.; Smith, D.F., 1979: Lithium and rubidium: effects on the rhythmic swimming movement of jellyfish (Aurelia aurita). The effects of adding LiCl, RbCl, KCl or NaCl to sea water at concentrations up to 30 mmoles/1 on the frequency of contraction of jellyfish (Aurelia aurita) suggest that studies on phylogenetically low animals with relatively simple nervous system...

Doncieux, L., 1933: Notes paleontologiques sur quelques Nummulites d'Espagne. Describes Eocene Nummulinidae from Spain, largely from Catalonia.

Anonymous, 1991: Not-for-profit hospital tax exempt as of its first day of operation. Journal of Health and Hospital Law 25(1): 30-30