The relation between polymerization conditions of vinylidene fluoride and content of head-to-tail chain in the polymer have been studied. It shows that the content of head-to-tail chain of the polymer are related to its polymerization temperature

but are not related with the kind of initiators used. Therefore

poly (vinylidene fluoride) with low content of head-to-head chain (ca. 3%) can be prepared under lower polymerization temperature. Plot of content of A chain against melting points of the polymer is linear

which can be expressed by an equation：A=24.8+0.362 Tm(%).