5.39 Consider an acrylic sheet of thickness L = 5 mm that is used to coat a hot, isothermal metal substrate at T, = 300°C. The properties of the acrylic are p= 1990 kg/m², c = 1470 J/kg · K, and k = 0.21 W/m • K. Neglecting the thermal contact resistance between the acrylic and the metal substrate, determine how long it will take for the insulated back side of the acrylic to reach its soft- ening temperature, Tyoft = 90°C. The initial acrylic tem- perature is T; = 20°C. %3D 352/ 1046

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