Thermal stability of poly(L-lactide) (PLLA) α’ crystals and its blocking effect on perfection of α crystals was reported in this manuscript. The results showed that, with annealing temperature (T_a) approaching to 150 °C, most α’ crystals transformed into α crystals, and the others with higher thermal stability still existed in those annealed samples. Interestingly, experiencing identical annealing, α crystals with residual α’ crystals displayed the bigger long period but the smaller lamella thickness than that of α crystals directly formed at 130 °C. Further, after the residual α’ crystals were totally melted, during annealing at a higher temperature, both lamella thickness and crystallinity of α crystals increased faster than that of α crystals with residual α’ crystals, even the latter was annealed at a lower temperature. This result is considered to promote understanding of the genesis of the PLLA α՛ crystals and the mechanism of α՛ to α transformation.

该手稿中报道了聚L-丙交酯（PLLA）α'晶体的热稳定性及其对α晶体完善的阻挡作用。结果表明，随着退火温度（T _a）温度接近150°C时，大多数退火后的样品中仍存在大部分的α'晶体转变为α晶体，而其他具有较高热稳定性的晶体仍然存在。有趣的是，经历相同的退火，具有残留α'晶体的α晶体与直接在130°C形成的α晶体相比，具有更长的周期，但薄片厚度更小。此外，在残余α′晶体完全熔化之后，在较高温度下的退火过程中，即使具有较低的α′晶体，α晶体的薄片厚度和结晶度的增加都快于具有残余α′晶体的α晶体。认为该结果有助于增进对PLLAα1晶体的起源以及α1至α转变的机理的理解。