Crystallization of isotactic poly(N,N-diethyl acrylamide) (i-PDEAA) prepared by ytterbium triflate/H2O-catalyzed radical polymerization in the presence of an organotellurium chain transfer agent was studied. i-PDEAA single crystals were successfully grown from solution using a mixture of methanol and diethyl ether as the solvent. Selected-area electron diffraction patterns obtained by transmission electron microscopy provided clear information about the unit cell and suggested polymorphisms of the i-PDEAA crystals. The lattice constants of the Form-1 crystal were determined to be a = 0.530 nm, b = 0.342 nm, c = 1.009 nm, and α = β = γ = 90°. On the other hand, the lattice constants of the Form-2 crystal were only roughly estimated to be a = 0.73 nm, b = 0.49 nm, and γ = 90°. Isotactic poly(N,N-diethyl acrylamide) (i-PDEAA) was prepared by ytterbium triflate/H2O-catalyzed radical polymerization in the presence of an organotellurium chain transfer agent. i-PDEAA single crystals were successfully grown from solution using a mixture of methanol and diethyl ether as the solvent. Selected-area electron diffraction patterns obtained by transmission electron microscopy provided clear information about the unit cell and suggested polymorphisms of the i-PDEAA crystals. Lattice constants of the two crystal forms were reported.

中文翻译：

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三氟甲磺酸镱/H2O催化立体选择性自由基聚合合成等规聚（N,N-二乙基丙烯酰胺）的结晶

研究了在有机碲链转移剂存在下通过三氟甲磺酸镱/H2O 催化自由基聚合制备的全同立构聚 (N,N-二乙基丙烯酰胺) (i-PDEAA) 的结晶。使用甲醇和乙醚的混合物作为溶剂从溶液中成功生长 i-PDEAA 单晶。通过透射电子显微镜获得的选区电子衍射图案提供了关于晶胞的清晰信息，并暗示了 i-PDEAA 晶体的多晶型。1 型晶体的晶格常数确定为 a = 0.530 nm、b = 0.342 nm、c = 1.009 nm 和 α = β = γ = 90°。另一方面，Form-2 晶体的晶格常数仅粗略估计为 a = 0.73 nm、b = 0.49 nm 和 γ = 90°。等规聚(N, N-二乙基丙烯酰胺）（i-PDEAA）是在有机碲链转移剂存在下通过三氟甲磺酸镱/H2O催化自由基聚合制备的。使用甲醇和乙醚的混合物作为溶剂从溶液中成功生长 i-PDEAA 单晶。通过透射电子显微镜获得的选区电子衍射图案提供了关于晶胞的清晰信息，并暗示了 i-PDEAA 晶体的多晶型。报告了两种晶型的晶格常数。通过透射电子显微镜获得的选区电子衍射图案提供了关于晶胞的清晰信息，并暗示了 i-PDEAA 晶体的多晶型。报告了两种晶型的晶格常数。通过透射电子显微镜获得的选区电子衍射图案提供了关于晶胞的清晰信息，并暗示了 i-PDEAA 晶体的多晶型。报告了两种晶型的晶格常数。