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设计、合成了以对六联苯(PHP)为硬段、以聚环氧乙烷(PEO,M_w=750)为软段的“线团-刚棒-线团”三嵌段低聚物(PEO-PHP-PEO),这是一个不含侧基的可溶聚对苯撑分子,不仅溶于氯仿、四氢呋喃等有机溶剂,而且溶于水。在水中,其临界胶束浓度CMC为5.25×10~(-4)mol·L~(-1),表面张力γcmc为61.29mN·m~(-1)。分子溶解水溶液的最大吸收波长为323nm,最大发射波长为432nm;聚集体溶液的荧光发射光谱与多晶PHP薄膜的相似,说明胶束中PHP链段由于疏水相互作用和π-π叠加作用而有序聚集。该低聚物分子在5.0×10~(-3)mol·L~(-1)水溶液中自组装成直径约为20nm的棉絮状纳米纤维。
Design and synthesis of “catenary-rigid rod-clumpy” triblock oligomer with hexa-biphenyl (PHP) as hard segment and polyethylene oxide (PEO, M_w = 750) PEO-PHP-PEO), which is a pendant-free soluble polyparaphenylene molecule dissolved in water not only in organic solvents such as chloroform and tetrahydrofuran. In water, the critical micelle concentration CMC is 5.25 × 10 -4 mol·L -1, and the surface tension γcmc is 61.29 mN · m -1. The maximum absorption wavelength of the molecularly dissolved aqueous solution is 323 nm and the maximum emission wavelength is 432 nm. The fluorescence emission spectrum of the aggregated solution is similar to that of the polycrystalline PHP film, indicating that the hydrophobic interaction between the PHP segments in the micelles and the π-π superposition Aggregation. The oligomer molecules self-assembled into cotton-like nanofibers with diameters of about 20 nm in 5.0 × 10 -3 mol·L -1 aqueous solution.