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Mathematical evaluation was made about the effect of an irregular molecular structure of a high-polymeric substance on the decrease of its degree of crystallinity. The assumptions in volved are as follows. A high polymer having irregularity not at all in its chain skeleton may crystallize perfectly up to 100%. In order that a polymer can anyhow crystallize to some extent, it would be necessary for the molecular chain to be intervened by sequences composed of crystallizable chain elements, wheredoi:10.1295/koron1944.15.778 fatcat:gbgqa6yuqzb4ncp7tei2bmrwdm