of ca. 380 °C on average. Differential scanning calorimetry showed that these DVA-based polyesters had no melting temperature and were amorphous. Their glass-transition temperatures varied from 19 to 89 °C, depending on the side-chain and diol-chain lengths. Cast films and melt-pressed films of the polyesters were obtained, and their mechanical properties were investigated by tensile testing. The P(Bu-BuDVA)
具有不同侧链长度的四种不同的对称二烷氧基二
香草酸单体,即甲氧基,乙氧基,丙氧基和丁氧基二
香草酸单体(MeDVA,EtDVA,PrDVA和BuDVA)(侧链碳数; m = 1,合成2、3和4)。以
四异丙氧基钛为催化剂,通过本体酯交换反应,将DVA基单体与具有不同烷基碳原子数(m'= 4和6)的链烷二醇进行聚合,以及一系列DVA基聚酯P(R'-RDVA) (m = 1、2、3和4,m′= 4和6)。聚酯的重均分子量(M w)达到6.24×10 4聚(
己二酸二丁氧基二香草酯)[P(He-BuDVA)]的合成。所获得的聚酯具有高的热稳定性,其热降解温度为约10%重量损失。平均380°C。差示扫描量热法显示这些基于DVA的聚酯没有熔融温度并且是无定形的。它们的
玻璃化转变温度从19到89°C不等,具体取决于侧链和二醇链的长度。获得了聚酯的流延膜和熔融压制膜,并通过拉伸试验研究了它们的机械性能。P(Bu