Segmental dynamics of specifically labeled poly(propylene oxide), PPO, based bottlebrush polymers, PNB-g-PPO, were studied using quasi-elastic neutron scattering. The focus was set to different parts of the side chains to investigate the hypothetical gradual relaxation behavior within the side chains of a bottlebrush polymer. Different sections of the side chains were highlighted for QENS via sequential polymerization of protonated and deuterated monomers to allow the study of the relaxation behavior of the inner and outer parts of the side chain separately. A comparison of these two parts reveals a slowdown due to the grafting process happening across the different regions. This is seen for the segmental relaxation time as well as on the time-dependent mean-square displacement. Additionally, the non-Gaussian parameter, α, shows a decreasing difference from Gaussian behavior with the distance to the backbone. Altogether, this leads to the conclusion that gradual relaxation behavior exists.

中文翻译：

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洗瓶刷聚合物中位置相关的片段松弛


使用准弹性中子散射研究了基于特殊标记的聚环氧丙烷 (PPO) 的瓶刷聚合物 (PNB-g-PPO) 的片段动力学。重点放在侧链的不同部分，以研究洗瓶刷聚合物侧链内假设的逐渐松弛行为。通过质子化和氘化单体的顺序聚合，QENS 突出显示侧链的不同部分，以便分别研究侧链内部和外部的弛豫行为。比较这两个部分可以发现，由于不同地区的嫁接过程发生了放缓。这可以从分段弛豫时间以及与时间相关的均方位移中看出。此外，非高斯参数 α 显示出与高斯行为的差异随着到骨干网的距离而减小。总而言之，这得出了渐进放松行为存在的结论。