Analysis of a sample of polyacrylonitrile shows that there are six lengths of chains, with the number of chains of each length shown in the table below. The molecular weight of the acrylonitrile monomer is 53 g/mol. Calculate the following: (a) The weight average molecular weight and degree of polymerization, (b) The number average molecular weight and degree of polymerization. Number Mean Of chains Molecular weight of chains (g/mol) 10,005 3010 18,005 6010 17,005 9010 15,005 12,010 9005 15,010 4005 18,010

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Thermal Properties of Materials

In mechanical engineering, the thermal property is represented as the physical quantity that is relevant to the application of heat. The thermal properties are evaluated by variations in any specific material due to low heat or high heat. The quantities that influence the thermal property of the materials are mass, density, temperature, and many others.