The refractive index, n of a polymer was determined as a function of temperature. The results are given in the table. Determine the glass transition temperature of the polymer. T/°C 20 30 40 50 60 70 80 90 100 110 120 130 n 1.5913 1.5898 1.5883 1.5868 1.5853 1.5838 1.5822 1.5801 1.5766 1.5725 1.5684 1.5643
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