Characterization from PMMA distribution

A) Generate retention volume chromatograms in tetrahydrofuran and TFE from test polymer samples, which are not necessarily narrow in molecular weight distribution and need not be characterized but are soluble in TFE and cover the retention volume range of interest in both solvents. The test polymers used were PMMA samples. 

Star—block copolymers were also prepared by Teyssie et al.60 from the reaction of living diblock copolymers with EGDM. (PS-b-PtBuA), and (PMMA-APtBuA), were synthesized by this method. The polydispersity of the stars was rather narrow but slightly increased compared to the parent diblocks, meaning that a distribution of functionalities existed in the final products. Only SEC was used to characterize the polymers. 

Sl-ATRP has also been used to modify the surface of quantum dots in order to improve the dispersibility and stability of these nanoparticles. Farmer and Patten demonstrated the use of Sl-ATRP to graft PMMA from CdS/Si02 core-shell nanoparticles [201]. A film formed from the resulting grafted nanoparticles exhibited the same luminescence properties as the CdS core, with the inorganic cores uniformly distributed throughout the polymer matrix. Esteves et al. reported grafting of poly(n-butyl acrylate) from CdS quantum dots via miniemulsion ATRP [202]. Characterization of the nanocomposites demonstrated an even dispersion of CdS cores in the polymer matrix. 

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