Thermal properties and degradation of enantiomeric random copolyesteramides poly(l-lactic acid-co-l-alanine) [P(LLA-LAL)] and poly(d-lactic acid-co-d-alanine) [P(DLA-DAL)] copolymers with wide alanine unit content ranges from 0 to 21 and 22 mol% were investigated by differential scanning calorimetry and themogravimetry. The total enthalpy of cold crystallization enthalpy and melting enthalpy as an indicator of crystallinity decreased with a decrease in lactic acid unit content or an increase in alanine unit content. Equilibrium melting temperature values of α-form homo-crystallites for the unblended samples decreased with an increase in alanine unit content (157.3–179.6 °C) and those of δ-form homo-crystallites for the unblended L100 and D100 (190.7 and 185.1 °C) were much higher than the reported values (both 172.8 °C, Polymer 2017, 9, 625). Thermal stability was enhanced by enantiomeric polymer blending, although thermal degradation was accelerated by incorporated alanine units. The activation energy for thermal degradation (ΔE_td) of the blend samples decreased with an increase in alanine unit content, whereas that of the unblended samples showed complicated dependence on alanine unit content and became maximum at alanine unit contents of 21 and 22 mol%. The blend samples had higher ΔE_td values comparted to those of the unblended samples, except for the alanine unit contents of 21 and 22 mol%. The reason for the high ΔE_td values of the unblended samples compared with that of the blend sample at the alanine unit contents of 21 and 22 mol% is discussed.

热性能和对映体无规共聚酯酰胺的降解聚（升-乳酸酸共-升-丙氨酸）[P（LLA-LAL）]和聚（d -乳酸酸共- d通过差示扫描量热法和热重分析法研究了丙氨酸单元含量范围从0到21和22摩尔％的[P（DLA-DAL）]共聚物。随着结晶度的降低，乳酸单位含量的增加或丙氨酸单位含量的增加，作为结晶度指标的冷结晶焓和熔融焓的总焓降低。未混合样品的α-型均晶的平衡熔融温度值随丙氨酸单位含量的增加而降低（157.3-179.6°C），而未混合样品L100和D100的δ-型均晶平衡熔融温度值（190.7和185.1°） C）远远高于报告值（均为172.8°C，Polymer 2017，9，625）。通过加入对映异构体聚合物可以提高热稳定性，尽管通过并入丙氨酸单元可以加速热降解。共混物样品的_ΔEtd）随着丙氨酸单位含量的增加而降低，而未掺合样品的ΔEtd）显示出对丙氨酸单位含量的复杂依赖性，并且在21和22mol％的丙氨酸单位含量时达到最大值。该共混物的样品具有更高的ΔE _TD值所区划的那些未混合样品中，除了21和22％（摩尔）的丙氨酸单元内容。究其原因，高ΔE _TD未共混样本的值与在21和22％（摩尔）的丙氨酸单元内容的共混物样品的比较进行了讨论。