Use of Microcalorimetry for Determination of Order in Polymers
Knowledge of the degree of order in polymers is of great importance in understanding the morphology and the physical properties of such materials. Such order has been determined heretofore by x-rays, density, specific heat, and infrared measurements, but such methods are either inapplicable or inaccurate at low degrees of order. However, Maron and Daniels (1) have shown recently that both high and low degrees of order in polymers can be determined to a high degree of accuracy from a combination of heat of solution and heat of dilution measurements. For application of this method the instrument most suitable is the Calvet microcalorimeter, particularly when modified in the manner to be described. The purpose of this talk is to describe this calorimeter and the modifications made in it, and to show how the data obtained with its aid can be used to ascertain polymer order.
KeywordsLower Volume Fraction Benzene Solution Yield Line Calculated Heat Solution Data
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