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Impact of backbone composition on homopolymer dynamics and brush block copolymer self-assembly
Polymer Chemistry ( IF 4.1 ) Pub Date : 2020-09-21 , DOI: 10.1039/d0py01007c Bret M Boyle 1 , Joseph L Collins 1 , Tara E Mensch 1 , Matthew D Ryan 1 , Brian S Newell 1 , Garret M Miyake 1
Polymer Chemistry ( IF 4.1 ) Pub Date : 2020-09-21 , DOI: 10.1039/d0py01007c Bret M Boyle 1 , Joseph L Collins 1 , Tara E Mensch 1 , Matthew D Ryan 1 , Brian S Newell 1 , Garret M Miyake 1
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Four series of brush block copolymers (BBCP), with near identical side chain compositions but varying backbone structures, were synthesized to investigate the effect of backbone structure on the process of thermal BBCP self-assembly to photonic crystals (PCs). Each of the self-assembled PC films was examined by reflection measurements, small angle X-ray scattering measurements, and scanning electron microscopy to compare the resulting properties of the polymeric photonic crystal and the nanostructured morphology impacted by the backbone structure. It was found that the composition of the brush backbone within a BBCP has a dramatic effect on the ability of the BBCP to self-assemble into ordered nanostructures and on the local ordering of the nanostructure morphology accessed with higher molecular weight (MW) BBCPs (>1500 kg mol−1). BBCPs with a norbornene imide-based backbone were able to thermally self-assemble to longer wavelength reflecting PCs and had higher fidelity ordering of lamellar nanostructures with higher MW polymers. By analyzing the melt rheological responses of the backbone compositions, both as linear polymers and homobrush polymers, it was concluded that the inherent fragility of the backbone promotes enhanced local ordering in the lamellar nanostructure morphology as well as access to larger domain sizes.
中文翻译：
主链组成对均聚物动力学和刷状嵌段共聚物自组装的影响
合成了四个系列的刷状嵌段共聚物（BBCP），其侧链组成几乎相同，但主链结构不同，以研究主链结构对 BBCP 热自组装到光子晶体（PC）过程的影响。通过反射测量、小角 X 射线散射测量和扫描电子显微镜检查每个自组装 PC 薄膜，以比较聚合物光子晶体的最终性能和受主链结构影响的纳米结构形态。研究发现，BBCP 内刷主干的组成对 BBCP 自组装成有序纳米结构的能力以及对使用较高分子量 (MW) BBCP 获得的纳米结构形态的局部有序性具有显着影响 (% 3E1500 kg mol -1 )。具有降冰片烯酰亚胺主链的 BBCP 能够热自组装成更长波长的反射 PC，并且具有更高分子量聚合物的层状纳米结构的更高保真度有序性。通过分析作为线性聚合物和同刷聚合物的主链组合物的熔体流变响应，得出的结论是主链固有的脆性促进了层状纳米结构形态中增强的局部有序性以及获得更大的域尺寸。
更新日期：2020-11-03
中文翻译：
主链组成对均聚物动力学和刷状嵌段共聚物自组装的影响
合成了四个系列的刷状嵌段共聚物（BBCP），其侧链组成几乎相同，但主链结构不同，以研究主链结构对 BBCP 热自组装到光子晶体（PC）过程的影响。通过反射测量、小角 X 射线散射测量和扫描电子显微镜检查每个自组装 PC 薄膜，以比较聚合物光子晶体的最终性能和受主链结构影响的纳米结构形态。研究发现，BBCP 内刷主干的组成对 BBCP 自组装成有序纳米结构的能力以及对使用较高分子量 (MW) BBCP 获得的纳米结构形态的局部有序性具有显着影响 (% 3E1500 kg mol -1 )。具有降冰片烯酰亚胺主链的 BBCP 能够热自组装成更长波长的反射 PC，并且具有更高分子量聚合物的层状纳米结构的更高保真度有序性。通过分析作为线性聚合物和同刷聚合物的主链组合物的熔体流变响应，得出的结论是主链固有的脆性促进了层状纳米结构形态中增强的局部有序性以及获得更大的域尺寸。
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