In this work, hydroxyl-terminated oxalamide compounds N¹,N²-bis(2-hydroxyethyl)oxalamide (OXA1) and N¹, N^1′-(ethane-1,2-diyl)bis(N²-(2-hydroxyethyl)oxalamide (OXA2) were synthesized to initiate the ring-opening polymerization of L-lactide for preparation of oxalamide-hybridized poly(L-lactide) (PLA_OXA), i.e., PLA_OXA1 and PLA_OXA2. The crystallization properties of PLA were improved by the self-assembly of the oxalamide segments in PLA_OXA which served as the initial heterogeneous nuclei. The crystal growth kinetics was studied by Hoffman-Lauritzen theory and it revealed that the nucleation energy barrier of PLA_OXA1 and PLA_OXA2 was lower than that of PLA. Consequently, PLA_OXA could crystallize much faster than PLA, accompanied with a decrease in spherulite size and half-life crystallization time by 74.8% and 86.5% (T = 125 °C), respectively. In addition, the final crystallinity of PLA_OXA1 and PLA_OXA2 was 6 and 8 times higher, respectively, in comparison with that of neat PLA under a controlled cooling rate of 10 °C/min. The results demonstrate that the hybridization of oxalamide segments in PLA backbone will serve as the self-heteronucleation for promoting the crystallization rate. The higher the content of oxalamide segments (PLA_OXA2 compared with PLA_OXA1) is, the stronger the promotion effect will be. Therefore, this study may provide a universal approach by hybridizing macromolecular structure to facilitate the crystallization of semi-crystalline polymer materials.

在这项工作中，羟基封端的草酰胺化合物N ¹，N ^2-双（2-羟乙基）草酰胺（OXA1）和N ¹，N ^1' -（乙烷-1,2-二基）双（N ^2-（2-羟乙基）草酰胺（OXA2）的合成以引发L-丙交酯的开环聚合制备草酰胺杂交的聚（L-丙交酯）（PLA的_OXA），即，PLA_氧杂和PLA _OXA2。PLA的结晶性质通过在PLA _OXA中草酰胺片段的自组装得到改善作为最初的异质核 利用Hoffman-Lauritzen理论研究了晶体的生长动力学，结果表明PLA _OXA1和PLA _OXA2的成核能垒低于PLA。因此，PLA _OXA的结晶速度比PLA快得多，同时球晶尺寸和半衰期结晶时间分别减少了74.8％和86.5％（T = 125°C）。此外，PLA _OXA1和PLA _OXA2的最终结晶度在控制的冷却速度为10°C / min时，其纯净PLA分别比纯PLA高6倍和8倍。结果表明，草酸酰胺片段在PLA主链上的杂交将作为自异核核酸，以提高结晶速率。的草酰胺段的含量较高（PLA _OXA2与PLA相比，_氧杂）是越强促进作用就越大。因此，这项研究可能通过杂交大分子结构以促进半结晶聚合物材料的结晶提供一种通用的方法。