New tricrystalline triblock terpolymers, polyethylene-block-poly(ε-caprolactone)-block-poly(L-lactide) (PE-b-PCL-b-PLLA), were synthesized by ROP of ε-caprolactone (CL) and L-lactide (LLA) from linear ω-hydroxyl polyethylene (PE-OH) macroinitiators. The linear PE-OH macroinitiators were prepared by C1 polymerization of methylsulfoxonium methylide (polyhomologation). Tin(II) 2-ethylhexanoate was used as the catalyst for the sequential ROP of CL and LLA in one-pot polymerization at 85 °C in toluene (PE-OH macroinitiators are soluble in toluene at 80 °C). ¹H NMR spectra confirmed the formation of PE-b-PCL-b-PLLA triblock terpolymers through the appearance of the characteristic proton peaks of each block. GPC traces showed the increase in the number average molecular weight from PE-OH macroinitiator to PE-b-PCL, and PE-b-PCL-b-PLLA corroborating the successful synthesis. The existence of three crystalline blocks was proved by DSC and XRD spectroscopy. © 2019 The Authors. Journal of Polymer Science Part A: Polymer Chemistry published by Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2019, 57, 2450–2456

中文翻译：

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结合多同系化和开环聚合的新型三晶三嵌段三元共聚物。合成和热性能

采用ε-己内酯( CL )和L- _ _ _ _ _ _ _ _来自线性ω-羟基聚乙烯（PE-OH）大分子引发剂的丙交酯（LLA） 。线性 PE-OH 大分子引发剂通过甲基亚砜的 C1 聚合（多同系化）制备。2-乙基己酸锡 (II) 用作 CL 和 LLA 的顺序 ROP 催化剂，在 85 °C 的甲苯中进行一锅聚合（PE-OH 大分子引发剂在 80 °C 下可溶于甲苯）。¹H NMR 光谱通过每个嵌段的特征质子峰的出现证实了 PE - b -PCL- b -PLLA 三嵌段三元共聚物的形成。GPC 曲线显示从 PE-OH 大分子引发剂到 PE- b - PCL 和PE- b - PCL - b -PLLA的数均分子量增加，证实了成功合成。DSC和XRD光谱证明了三个结晶块的存在。© 2019 作者。高分子科学杂志 A 部分： Wiley Periodicals, Inc. J. Polym 出版的高分子化学。科学，A 部分：Polym。化学。2019 , 57 , 2450–2456