کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5185001 1381063 2009 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
The second virial coefficients of highly-purified ring polystyrenes in cyclohexane
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آلی
پیش نمایش صفحه اول مقاله
The second virial coefficients of highly-purified ring polystyrenes in cyclohexane
چکیده انگلیسی

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.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer - Volume 50, Issue 5, 23 February 2009, Pages 1300-1303
نویسندگان
, , , , ,