In this study, the molecular mobility of acetylated starch (AS) with degree of substitution (DS) 1.5 and 3, representing partial and complete substitution of hydroxyl groups with acetyl groups, was investigated. The glass transition region and the onset of long-range cooperative molecular motions were examined using temperature-modulated-DSC (TMDSC). A potential analogy between the relaxation time of hole formation and the $\alpha$-relaxation time was observed. The deviation in the temperature dependence of the $\alpha$-relaxation time from the Arrhenius relationship, obtained with the fragility index, revealed differences according to DS. The cooperative rearranging region (CRR) characteristics differed according to DS and estimation method. Smaller size of the CRR for AS with DS 3 compared to AS with DS 1.5 suggest disruption of hydrogen bonds at high acetylation level. TMDSC experimental data at moderate temperature and predictions and SS-NMR results at ambient temperature, indicate different mobility of AS according to DS and temperature conditions.

在这项研究中，研究了取代度（DS）为1.5和3的乙酰化淀粉（AS）的分子迁移率，表示羟基被乙酰基部分和完全取代。使用温度调节DSC（TMDSC）检查了玻璃化转变区域和长距离协作分子运动的开始。孔形成的弛豫时间与孔的弛豫时间之间的潜在比喻。$\alpha$观察到松弛时间。温度依赖性的偏差$\alpha$根据DS，由Arrhenius关系得出的松弛时间由脆性指数得出，显示出差异。协同重排区域（CRR）特性根据DS和估计方法而有所不同。与具有DS 1.5的AS相比，具有DS 3的AS的CRR较小，表明在高乙酰化水平下氢键的破坏。在适中温度下的TMDSC实验数据以及在室温下的预测和SS-NMR结果表明，根据DS和温度条件，AS的迁移率不同。