The crystalline morphology of a double crystalline polyethylene-block-poly(β-propiolactone) diblock copolymer (PE-b-PPL) was examined using synchrotron small-angle X-ray scattering (SR-SAXS), where the PPL block crystallized into δ- or β-form according to the thermal history during sample preparation. Furthermore, the isothermal crystallization process of PE-b-PPL was pursued using simultaneous time-resolved SR-SAXS and wide-angle X-ray diffraction (SR-WAXD). The crystallization behavior of δPPL blocks (i.e., PPL blocks to crystallize into δ-form) was similar to that of PE blocks without any detectable induction time, so simultaneous crystallization of PE and δPPL blocks was observed on quenching from a lamellar microdomain structure (LMS), yielding a largely distorted LMS (with the standard deviation of each lamella thickness ∼ 36%). On the other hand, the βPPL blocks (i.e., PPL blocks to crystallize into β-form) started to crystallize after an appreciable induction time, showing sequential crystallization (i.e., advance crystallization of PE blocks and subsequent crystallization of βPPL blocks) to form a slightly distorted LMS (18%). Consequently, the final crystalline morphology was significantly different depending on the crystal structure of PPL blocks, though the crystallization started from an identical LMS. The crystallization mechanism of PE-b-PPL was discussed by considering the difference in crystallization kinetics between PE blocks and PPL (δPPL or βPPL) blocks.

使用同步加速器小角X射线散射（SR-SAXS）检查了双晶聚乙烯嵌段-聚（β-丙内酯）双嵌段共聚物（PE- b- PPL）的晶体形态，其中PPL嵌段结晶成δ根据样品制备过程中的热历史而形成-或β形式。此外，PE- b的等温结晶过程-PPL是使用同时时间分辨SR-SAXS和广角X射线衍射（SR-WAXD）追求的。δPPL嵌段的结晶行为（即，PPL嵌段结晶成δ形式）与PE嵌段相似，但没有可检测的诱导时间，因此在从层状微区结构（LMS）淬灭时观察到PE和δPPL嵌段同时结晶），导致LMS失真很大（每个薄片厚度的标准偏差约为36％）。另一方面，βPPL嵌段（即，结晶成β形式的PPL嵌段）在一段明显的诱导时间后开始结晶，显示出顺序的结晶（即，PE嵌段的提前结晶和βPPL嵌段的随后结晶）形成LMS稍有失真（18％）。所以，尽管结晶是从相同的LMS开始的，但最终的晶体形态却因PPL嵌段的晶体结构而显着不同。PE-的结晶机理通过考虑PE嵌段和PPL（δPPL或βPPL）嵌段之间的结晶动力学差异来讨论b -PPL。