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首页> 外文期刊>ACS Macro Letters >Optimizing the Grafting Density of Tethered Chains to Alter the Local Glass Transition Temperature of Polystyrene near Silica Substrates: The Advantage of Mushrooms over Brushes
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Optimizing the Grafting Density of Tethered Chains to Alter the Local Glass Transition Temperature of Polystyrene near Silica Substrates: The Advantage of Mushrooms over Brushes

机译：优化束缚链的移植密度改变二氧化硅基材附近聚苯乙烯的局部玻璃化转变温度：蘑菇在刷子上的优势

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摘要

We measured the local glass transition temperature T-g(z) of polystyrene (PS) as a function of distance z from a silica substrate with end-grafted chains using fluorescence, where competing effects from the free surface have been avoided to focus only on the influence of the tethered interface. The local T-g(z) increase next to the chain grafted substrate is found to exhibit a maximum increase of 49 +/- 2 K relative to bulk at an optimum grafting density that corresponds to the mushroom-to-brush transition regime. This perturbation to the local T-g(z) dynamics of the matrix is observed to persist out to a distance z approximate to 100-125 nm for this optimum grafting density before bulk Tg is recovered, a distance comparable to that previously observed by Baglay and Roth [J. Chem. Phys. 2017, 146, 203307] for PS next to the higher-T-g polymer polysulfone.
机译：我们测量聚苯乙烯（PS）的局部玻璃化转变温度Tg（Z）作为来自二氧化硅衬底的距离Z的函数，所述荧光末端接枝链，其中已经避免了从自由表面的竞争效应仅关注影响 束缚界面。 发现链接枝基材旁边的局部T-G（Z）增加，相对于体积的最大增加，最大地增加49 +/- 2k，其对应于蘑菇 - 刷式过渡方案。 对于局部Tg（z）的局部Tg（z）动力学的这种扰动被观察到持续到距离z到100-125nm的距离z，以便在堆积Tg之前的这种最佳的接枝密度，与先前通过袋子和罗斯观察到的距离 [J. 化学。 物理。 2017,146,203307]在高于T-G聚合物聚砜旁边的PS。

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