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本文报导一种低苯乙烯含量(5％,Wt.)的丁二烯-苯乙烯共聚物,经~1H NMR证明其分子链上不存在相邻苯乙烯单元。荧光光谱结果表明,它在良溶剂(二氯乙烷)的稀溶液状态下只呈现单分子荧光。从良溶剂-θ溶剂(二氯乙烷-甲醇体系)及稀溶液-浓溶液-固体之荧光光谱的变化,证明形成了链内非近邻生色团之间和链间生色团之间的激基缔合物(Excimer)。从固体与θ溶剂的激基缔合物荧光的比较,还可区分链内非近邻和链间苯环形成激基缔合物对荧光强度的贡献。这一结果对阐明高分子链内非近邻和链间激基缔合作用提供了新的证据,并有助于了解高聚物本体中相互穿透、相互缠结的无规线团的形态。
In this paper, a butadiene-styrene copolymer with low styrene content (5%, Wt.) Was reported. It was confirmed by ~ 1H NMR that no adjacent styrene units existed in the molecular chain. Fluorescence spectroscopy showed that it showed only single-molecule fluorescence in a dilute solution of good solvent (dichloroethane). Fluorescence spectra from a good solvent-theta solvent (dichloroethane-methanol system) and a dilute solution-concentrated solution-solid demonstrate that the formation of excitations between non-adjacent chromophores and between the interchain chromophores Excimer. From the fluorescence of excimer of solid and theta solvents, it is also possible to distinguish the contribution of the excimer to the fluorescence intensity of the non-neighbors and the interchain benzene rings in the chain. This result provides new evidence for elucidating the non-vicinal and interchain excitatory associative effects within the polymer chain and helps to understand the morphology of random coils interpenetrating with each other in the bulk of the polymer.