writer：Wang XL, Gu Q, Sun Q, Zhou DS, Sun PC, Xue G
keywords：poly(2,6-dimethyl-1,4-phenylene oxide), polystyrene, blend, compatibility, solid-state NMR
source：期刊
specific source：Macromolecules 2007, 40, 9018-9025
Issue time：2007年
Polymer compatibility was investigated by a new strategy reported in our recent communication combining preparation of an isotopically enriched polymer blend with analysis by dipolar filter 1H solid-state NMR under fast magic angle spinning (MAS). Technical details concerning the optimization of the experimental conditions of this method were first discussed. The intimate segment mixing and interchain interaction in blends  of deuterated polystyrene (PS-D)/hydrogenated poly(2,6-dimethyl-1,4-phenylene oxide) (PPO) were then qualitatively characterized and compared to that in PS-H/PS-D blends. It was found that the PS-D chain is in proximity to both the aromatic and the aliphatic protons of PPO chain within 0.5 nm, and it was suggested that the distance between PS-D and the aromatic ring of PPO is shorter than that between PS-D and the aliphatic side group of PPO, whereas only the proximity within 0.5 nm among aromatic rings was observed in PS-H/PS-D blends. As compared to DSC experiment, this work also demonstrates that our strategy is sensitive enough to
probe the driving force of interchain compatibility between PS-D and PPO during the interfacial diffusion process of melt blending at a molecular level.