Self-Assembly of Alkali-Soluble [60]Fullerene Containing Poly(methacrylic acid) in Aqueous Solution

Abstract

Well-defined stimuli-responsive alkali-soluble poly(methacrylic acid)-block-[60]fullerene (PMAA-b-C60) was synthesized via atom transfer radical polymerization (ATRP), and its aggregation behavior in aqueous solution was examined using potentiometric and conductometric titrations, static and dynamic light scattering, and transmission electron microscopic (TEM) techniques. PMAA-b-C60 shows pH-responsive and water-soluble properties at high pH. In dilute solution, the micelles and large secondary aggregates, which are independent of polymer concentration, coexist in solution. The R h of micelles increases from 6 to 10 nm with increasing degree of neutralization and remains constant at 10 nm with the addition of salt. However, the R h of large aggregates increases from 91 to 153 nm with increasing degree of neutralization and decreases from 153 to 105 nm with increasing NaCl concentration. TEM studies revealed that the large aggregates comprise of individual micelles and possess microstructure similar to large compound micelles (LCM).

Synthesis and Self-Assembly of [60]Fullerene Containing Sulfobetaine Polymer in Aqueous Solution

“…20 Over the last couple of few years, we have focused on the synthesis and self-assembly behavior of well-defined fullerene containing polymers. Recently, we have synthesized a series of well-defined stimuliresponsive C 60 containing polyelectrolytes such as poly(2-(dimethylamino)ethyl methacrylate) (PDMAEMA-b-C 60 ) 21 and poly(methacrylic acid)-b-C 60 (PMAA-b-C 60 ) 22 , 23 and polyampholytes such as P(MAA-b-DMAEMA)-b-C 60 24 and studied their self-assembly behavior as a function of pH and temperature. Both PDMAEMA-b-C 60 and PMAA-b-C 60 possess micellar-like aggregate at low and high pH respectively.…”

The adsorptive removal of cationic dye from aqueous solution using Poly (methacrylic acid) Hydrogels:Part-I. equlibrium studies

“…However, as the pH is increased further, the mass swelling begins to decrease. This might be due to formation of un-crosslinked poly(MAc) hydrogel which must has a fair tendency to dissolve in alkaline medium (Ravi et al, 2005). (29) hydrogel.…”

Stimuli‐Responsive Water‐Soluble Fullerene (C60) Polymeric Systems

“…[ 36 ] First, a well-defi ned -Clterminated P t BMA with PDI of 1.13 was synthesized by ATRP, then ATRA was utilized to attach C 60 to the end of P t BMA in excess amounts of C 60 in order to avoid multiple substitutions of polymer chains to C 60 . Finally, the t -butyl protecting group was removed by hydrolysis.…”

“…C 60 modifi ed with these kinds of polymers combines the unique properties of C 60 with the stimuli characteristics of the polymers that may extend their end-use applications in the fi elds of biotechnology and biomedicine. In recent years, a variety of stimuliresponsive water-soluble fullerene systems have been reported such as PMAA-C 60 , [ 36 ] PDMAEMA-C 60 [ 37 , 38 ] and its betainization derivative, [ 39 ] P(MAA-bDMAEMA)-C 60 , [ 40 ] PAA-C 60 , [41][42][43] and PNIPAM-C 60 systems. [44][45][46][47] Over the last two decades, various C 60 -containing polymers, including hydrophobic and hydrophilic polymers have been prepared and their structures are shown schematically in Figure 1 .…”