Thiol-disulfide interchange mediated reversible dendritic megamer formation and dissociation

Macromolecules

Volumn 42, Issue 19, 2009, Pages 7353-7359

  Kiran, Balaji Manjappa ^a   Jayaraman, Narayanaswamy ^a  

^a INDIAN INSTITUTE OF SCIENCE   (India)

Author keywords

[No Author keywords available]

Indexed keywords

ALKYL ARYL ETHERS; DISULFIDE BOND FORMATION; DISULFIDE BONDS; DITHIOTHREITOL; INTERCHANGE REACTIONS; MEGAMERS; OPTICAL DENSITIES; THIOL-DISULFIDE; THREE GENERATIONS;

DISSOCIATION; ETHERS; FUNCTIONAL POLYMERS; INTERCHANGES; SYNTHESIS (CHEMICAL); TRANSMISSION ELECTRON MICROSCOPY;

DENDRIMERS;

EID: 70350020381     PISSN: 00249297     EISSN: None     Source Type: Journal    
DOI: 10.1021/ma9010022     Document Type: Article

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31. An effort was undertaken to estimate the number of monomers that would constitute the megamer, assuming megamers as speherical particles. The estimation represented the ratio of megamer volume to that of monomer volume. The mean diameter for each megamer was obtained from TEM measurements and was used in the calculation of volume (4/3πr3). The volume of each megamer was (mean diameter in parentheses): G0-megamer, 61 600 nm3 (49 nm); G1-megamer, 904778 nm3 (120 nm); G2-megamer, 1 177 097 nm3 (131 nm) and G3-megamer, 1 763 438 nm3 (150 nm). The volume of each monomer was (average diameter, deduced from molecular modeling method, in parentheses): 13, 3.1 nm3 (1.8 nm); 14, 26.0 nm3 (3.7 nm); 15, 57.9 nm3 (4.8 nm); 16, 107.5 nm3 (5.9 nm). Accordingly, the number of monomers constituting each megamer would be as follows: G0-megamer, 19 870; G1-megamer, 34 800; G2-megamer, 20 330; G3-megamer, 16 404. A deviation of the number of monomers in G0-megamer is seen, which is attributed to a high standard deviation in the TEM particle sizes.
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