Poly(acrylic acid) and 100% neutralized poly(acrylic acid) in pure water were stirred at 30°C at 30,000 rpm with a T. K. Homomixer at polymer concentrations ranging from 2% w/v to 0.0025% (25 ppm) for 2 hr to investigate the effect of polymer chain conformation on chain scission by high‐speed stirring. After 2 hr of stirring at low concentration, intrinsic viscosity measured in 1.00 mole/1. NaCl solution at 30°C for 100% neutralized polymer was lower for the polymer which was stirred after 100% neutralization than for the one before 100% neutralization, showing that expanded polymer chains were more easily ruptured.
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Nakano et al. (1978) studied this question.
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