Stimuli responsive associative polyampholytes based on ABCBA pentablock terpolymer architecture

Poly(methacrylic acid-ran-2-vinylpyridine) Statistical Copolymer and Derived Dual pH-Temperature Responsive Block Copolymers by Nitroxide-Mediated Polymerization

“…Therefore, it was expected that the copolymers of MAA/2VP will be water soluble at low and high pH but will have decreased water solubility in slightly acidic/basic environments. A similar trend was reported for amphiphilic poly(MAA/diethylamino ethyl methacrylates (DEAEMA))-b-poly(methyl methacrylate) diblock terpolymers [9] and with other ampholytic systems [11,74,75]. From Figure 3, at very low pH (pH < 1), all copolymers possessed particle sizes~10 nm, indicating well-dissolved unimers.…”

“…Later, the uncoupling of the charges was desired to make block copolymers, which led to dramatically different properties in solution. Traditionally, living polymerizations such as ionic [6][7][8][9][10][11] and later group transfer polymerization [12][13][14][15][16] were used to make polymers with active chain ends that would permit the formation of poly(ampholytes) or schizophrenic block copolymers with a controlled sequence length and narrow molecular weight distributions. In the case of charged species, however, this required protecting group chemistry during the synthesis [6,10].…”

Rheology of associative polymer solutions

“…A different family of water soluble triblock copolymers is based on charged central blocks such as PAA [58][59][60][61][62], PMA [7], PDMA [63,64], PDMAEMA [65], and PMPC [66,67]. The polyelectrolyte character of the central block renders these systems sensitive to the ionic strength and the pH [68].…”

Rheology and phase behavior of thermo‐reversible pentablock terpolymer hydrogel

“…Moreover, the G ′ is found to be greater than the G ″ in the whole shear stress range, indicating the elastic behavior of the terpolymer gel. Similarly, of the terpolymer solution at 30 °C is only 100 mPa s irrespective of the shear stress, but increases up to 7 × 10 4 mPa s at low shear stress at 41 °C, suggesting strong gelling efficiency . A Newtonian plateau is also observed below the critical shear stress value of 50 Pa followed by an abrupt decrease.…”

“…Similarly, jg à j of the terpolymer solution at 30 C is only 100 mPa s irrespective of the shear stress, but increases up to 7 3 10 4 mPa s at low shear stress at 41 C, suggesting strong gelling efficiency. 39,40 A Newtonian plateau is also observed below the critical shear stress value of 50 Pa followed by an abrupt decrease.…”