The second virial coefficients of highly-purified ring polystyrenes in cyclohexane |
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Authors: | Atsushi Takano Yuuki Kushida Yutaka Ohta Keisuke Masuoka Yushu Matsushita |
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Affiliation: | Department of Applied Chemistry, Graduate school of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan |
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Abstract: | The second virial coefficients A2 of ring polystyrenes with high purity in cyclohexane were measured by light scattering in the temperature range 27.0-34.5 °C. The purity of four samples with Mw of 16k, 42k, 110k and 570k was determined to be all over 96% by HPLC. It has been found that A2s of all the samples are definitely positive at the theta temperature of linear polystyrene, 34.5 °C, and the measured values for four samples converged to zero at 27.7 °C with decreasing temperature. This value is below the previously reported one, but it is quite consistent with the predicted value based on the topological repulsive interaction among the ring polymer molecules. |
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Keywords: | Ring polystyrene Theta temperature Topological interaction |
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