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利用原子转移自由基聚合 (ATRP)方法合成了窄分布的端基含有芘或萘的聚苯乙烯 (Py PS和Na PS) .研究了Py PS在四氢呋喃 (THF)溶液中的荧光发射光谱随加水量的变化 .结果表明 ,加水初期随着加水量的增加 ,对应于芘的单体荧光发射峰强度 (IM)增加 ,当水加到一定量时 ,观察到由芘形成的激基缔合物 (excimer)的荧光光谱峰 ,其强度 (IE)随加水量的增加而进一步增强 ,而IM 下降 ,直至体系产生宏观的相分离 ,此时IM 和IE 均不变 .对这一结果从分子水平上进行了讨论 ,并通过IE/IM 与I1/I3 随加水量的变化得到了不同浓度下Py PS在THF中聚集的临界加水量 .另外 ,我们也用非辐射能量转移 (NRET)的方法研究了Py PS和Na PS混合溶液的聚集 .这些结果对于进一步研究含聚苯乙烯链段的嵌段共聚物在溶液中的聚集有重要意义
A narrow distribution of polystyrene (Py PS and Na PS) containing pyrene or naphthalene was synthesized by atom transfer radical polymerization (ATRP). The fluorescence emission spectra of Py PS in tetrahydrofuran (THF) The results showed that with the increase of water addition in the initial stage of adding water, the peak intensity (IM) of the monomer corresponding to pyrene increased, and when the water was added to a certain amount, the excimer formed by pyrene (excimer), its intensity (IE) increased with the increase of water addition, while IM decreased until the system produced macroscopic phase separation, in which case both IM and IE were unchanged.This result was analyzed from the molecular level , And the critical water additions of Py PS in THF at different concentrations were obtained by the change of water additions with IE / IM and I1 / I3. In addition, we also used non-radiative energy transfer (NRET) method to study The aggregation of Py PS and Na PS mixed solution.These results are of great significance for the further study of the aggregation of the block copolymer containing polystyrene segments in solution