Studies on Glass XV. The Viscosity and Rigidity of Glucose Glass

Abstract

By an electromagnetic torsion method, in which glucose glass threads were substituted for the phosphor‐bronze suspension in a d'Arsonval galvanometer, the rigidity and viscosity of glucose glass have been measured between 12° and 37.5°C. The rigidity values were fairly constant around 2.5 (10¹⁰) dynes per cm² between 12° and 30° but decreased rapidly above the latter temperature. The viscosity values ranged between 10¹⁵ and 10¹⁰ poises. These values decreased rapidly with rising temperatures but also depended greatly on the previous history of the glass threads, i.e., the extent to which the threads had been annealed and the amount of previous working to which they had been subjected. This finding suggests the existence of a series of glassy states for a substance such as amorphous glucose.