Rav og glas

Johanne Aagaard, Emil Niels Heinrichsen, Tommy Buch-Madsen, Lars Malik Richardt Thrane, Trine Holm Freiesleben & Simon Stampe Skovgaard

Studenteropgave: Semesterprojekt

Abstrakt

Abstract. Amber and Glass. The aim of this project is, through thermodynamic studies, heating- and cooling experiments, and DSC-scanning, to decide whether or not amber is a glass. To measure a glass transition temperature in amber, it has been necessary to alter an already existing experiment from measuring glass transition temperatures between 77 K and room temperature, to temperatures between room temperature and 573 K by the use of an oven. We have come up with a hypothesis that polymerization, release of volatile molecules and the forming of crosslinks in resin, has raised the glass transition temperature above the temperature of the resin, through millions of years, so that the material has glassed. The glass transition temperature has continuously been raised. The amber has polymerized further through millions of years, even though the surrounding temperature has been far below the glass transition temperature. We have constructed a definition of glass, and we conclude through our own experiments and literature studies, that amber from Haiti is a naturally occurring glass.

UddannelserBasis - Naturvidenskabelig Bacheloruddannelse, (Bachelor uddannelse) Basis
SprogDansk
Udgivelsesdato19 jun. 2008
VejledereKristine Niss

Emneord

  • Glass transition
  • Amber
  • Glass