Casting of organic glass by radiation‐induced polymerization of glass‐forming monomers at low temperature. II. Optical strain of remaining stress type

摘要

AbstractPreviously it was found that casting could be carried out efficiently without strain formation by radiation‐induced polymerization of glass‐forming monomers. Two types of strain were observed in casting: thermal stream type, which was studied previously, and remained stress type. In this report, the effect of various factors on the formation of remaining stress‐type strain in radiation‐induced casting polymerization was studied. It was found that the molecular weight of prepolymer did not affect strain formation, while prepolymer concentration and viscosity of the system had a serious influence on strain formation. It could be deduced that this type of strain formed as a result of remaining inner stress due to poor relaxation of the shrinking stress. It was realized that less volume shrinkage of glass‐forming monomers accompanying casting polymerization reduced the strain formation of this type in radiation‐induced casting polymerization at low t