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

为了阐明通过酯交换作用解缠结对shish结构形成的影响，我们使用酯基之间具有不同间隔基长度的几种聚酯如聚（L-乳酸）; PLLA，聚（12-羟基十二烷酸）; PHDA和聚（16-羟基十六烷酸）; PHHA研究了机理。结果表明，<sh>随着酯交换反应次数的增加，饱和生成密度降低.另一方面，我们还发现PHDA的shish I的形成速率小于PHHA。这表明前者的酯交换反应频率高于后者。我们的结论是，解缠结通过酯交换聚酯显着抑制shish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.