Role of disentanglement via transesterification in the formation of shish structure of polyesters

为了阐明酯交换解缠对鱼的结构形成的影响，我们利用聚l -乳酸等酯基之间具有不同间隔长度的几种聚酯研究了酯交换解缠的机理；聚12-羟基十二烷酸；PHDA和聚16-羟基十六烷酸；PHHA。结果表明，shish v_<sh>的饱和形成密度随着酯交换频率的增加而降低。另一方面，我们也发现PHDA的shish I的形成速率比PHHA小。这表明前者的酯交换频率高于后者。我们得出结论，通过聚酯酯交换解除缠结可以显著抑制鱼状结构的形成。

In order to clarify the effect of disentanglement via transesterification on the formation of shish structure, we studied the mechanism using several polyesters having different spacer length between ester groups such as poly(L-lactic acid); PLLA, poly(12-hydroxydodecanoic acid); PHDA and poly(16-hydroxyhexadecanoic acid); PHHA. We found that the saturated formation density of shish v_<sh> decreased with increasing frequency of transesterification. On the other hand, we also found that the formation rate of shish I of PHDA was smaller than that of PHHA. This indicates that frequency of transesterification of the former is higher than that of the latter. We concluded that disentanglement via transesterification of polyesters significantly suppresses the formation of shish structure.