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The string relaxation equation (SRE) of the string model for the glasstransition contains the well-known Debye and Rouse-Zimm relaxation equations.However, its initial condition, necessary to the model predictions of glassydynamics, such as the mechanism of the universal primary alpha- andJohari-Goldstein beta-relaxations in glassformers, has not been solved. In thispaper, the special initial condition (SIC) of the SRE of straight strings fordielectric spectrum technique, which is one of the most common methods tomeasure the glassy dynamics, was tentatively calculated by a direct calculationmethod, finding that the method has not any practical feasibility. However, arecursive calculation method was developed that allows to obtain the SICexactly. It should be expected that the obtained SIC would benefit the thoroughsolution of the general initial condition of the SRE of the string model forstochastically spatially configurating strings, as will be described inseparate publications.

Initial condition of the string relaxation equation of the string model for glass transition: part-I