Patent ID: 8014989
Filing Date: 2011-09-06
Classification: G01N

Abstract:
1. A method for calculating a birefringence of a polymer in a birefringence calculating apparatus comprising a processor and a memory, comprising: an amorphous state generating step comprising accepting input of a parameter from an external device, generating a model of the polymer on the basis of the parameter, and bringing the model into an amorphous state; a stretching step comprising stretching the model brought into the amorphous state in the amorphous state generating step, carried out by the birefringence calculating apparatus; a birefringence calculating step comprising calculating a birefringence of the model stretched in the stretching step; an outputting step comprising outputting the birefringence calculated in the birefringence calculating step to a device, carried out by the birefringence calculating apparatus; and a determination step comprising determining whether the birefringence calculated in the birefringence calculating step satisfies a termination condition set in advance; outputting the birefringence in the outputting step when the termination condition is satisfied; and, when the termination condition is not satisfied, changing the parameter relating to the polymer, again generating a model of the polymer on the basis of the changed parameter, and calculating a birefringence, wherein simulation comprising the generating, stretching, calculating, outputting and determining steps is repeated, wherein different parameters apply to the generating step until a termination condition is met, and wherein the parameter change relating to the polymer is a change of monomers forming the polymer, or copolymerization of another kind of monomer, wherein the termination condition is that the birefringence is in a range defined by a preset upper threshold and a preset lower threshold, and