The miscibility of a classical lower critical solution temperature (LCST) system; PMMA/SAN was probed by different rheological fingerprints such as isochronal temperature ramps, and isothermal frequency sweeps, in presence of graphene oxide (GO) and PMMA tethered GO. The chain length of the grafted polymer was varied to study its effect on miscibility, volume cooperativity, entanglement density and localization in the blends. The PMMA tethered GO alters the chain dynamics both at local and cooperative length scale through entropic and enthalpic interactions. It was perceived that the thermodynamic miscibility, cooperative relaxations and concentration fluctuation in PMMA/SAN blends are controlled by the spatial distribution of GO in the blend. By varying the chain length, we were able to understand that shorter tethered chains lead to early phase separation whereas the tethered chain length similar to that of the host matrix delays phase separation. Interestingly, irrespective of the length of the tethered polymer chain, the grafted GO sheets were not localized in the thermodynamically preferred phase (here PMMA). These findings are of great importance to further help us understand the theories and simulations which pertain to chain dynamics of PMMA/SAN blends containing polymer-tethered nanoparticles with large specific surface area like GO.

经典的较低临界溶液温度（LCST）系统的混溶性；在存在氧化石墨烯（GO）和PMMA束缚的GO的情况下，通过不同的流变指纹（例如等时温度梯度和等温扫频）探测PMMA / SAN。改变接枝聚合物的链长以研究其对共混物中混溶性，体积合作性，缠结密度和局部化的影响。PMMA系链GO通过熵和焓相互作用在局部和协作长度尺度上改变链动力学。可以看出，PMMA / SAN混合物中的热力学混溶性，协同弛豫和浓度波动受混合物中GO的空间分布控制。通过改变链长，我们能够理解，较短的束缚链可导致早期相分离，而与宿主基质的束缚链长度相似的束缚链长度会延迟相分离。有趣的是，不管系留的聚合物链的长度如何，接枝的GO片材均不位于热力学优选的相（此处为PMMA）中。这些发现对进一步帮助我们理解与包含具有较大比表面积的聚合物束缚的纳米粒子（如GO）的PMMA / SAN共混物的链动力学有关的理论和模拟非常重要。