We present a measurement of the mechanical properties of single polystyrene molecules of size R≈50nm. Using a micromechanical technique, we show directly that the polymer chain behaves like a spring, and we measure the spring constant. We examine both cross-linked and non-cross-linked polystyrene. The former forms a stiffer spring, and the value of the spring constant is in agreement with theory, while in the latter case the measured value is larger than expected.
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Jensenius et al. (1997) studied this question.
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